Keep Safe & Fastened: The Performance & Scope of Security Tamper Resistant (Tamperproof) Screws and Nuts

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Protection against any form of harm is a basic right of every individual. This is precisely why every household uses its own set of safety and security measures in a variety of situations, items, and practices. Similarly, a growing number of organizations are consistently focusing on manufacturing goods and systems with detailed and carefully developed safety features. This effort by responsible organizations essentially enhances their product quality which reflects well on their reputation among the target audience. As a matter of fact, organizations that manufacture safe and secure goods contribute to community protection as well as industrial growth.

Basically, ensuring high safety levels enables manufacturing companies to produce products and systems that are fit for use and fit for purpose alike. However, the significance of methods that induce product safety is even more necessary for product categories that have safety risks associated with them. In order to deliver the end users with products and systems that are designed to overcome the challenges from usage or external destruction, companies use a variety of materials and fixtures in their final product. In this regard, security fasteners are an outstanding example.

Brief Overview

As the name suggests, security fasteners are screws that tamper proof devices and systems, making them resistant against accidental damage or vandalism. The primary and distinguished design feature of security fasteners is the unique shape of screw heads which cannot be removed through the use of conventional screw drivers. In fact, security fasteners can only be installed and removed with their specifically designed and designated tools.

From electrical appliances to security systems, from locks and vaults to child safety restraint systems; tamper resistant fasteners are used for a wide array of devices. With their ability to tamper proof the products, security fasteners greatly reduce possible hazards for the users as well as unauthorized invasion by outsiders or vandals. To put it another way, tamper resistant fasteners offer the key benefits of low risks of injury, theft, and equipment damage.

Product Innovation

Similar to the advancement in many industries and individual companies, leading and enterprising firms that produce tamper resistant fasteners have several innovative products to offer to their customers. For instance, the uniqueness of design is no longer confined to the screw head of tamper resistant fasteners. There are new options available in the market, which include varying and complex bolting or installation systems, screw threads, machine screw threads, etc.

Types & Examples

Considering the countless designs and types of security fasteners available, it is not possible to highlight a single one as an ideal choice. To derive this conclusion, it is important for the customers to review their own product needs against the types and features of different tamper resistant screws available. Nonetheless, it is equally important to have basic knowledge the range of security fasteners and their screw head designs:


Square Recess Screw Head

This is similar to a regular square recess design. However, right in the center of the square there is an additional pin or tip which differentiates it from a basic design and also makes it necessary for its removing tool to have a designated slot. This is how the square recess screw head must be removed with a specific device that ensures a firm grip of the small pin.

Torx Screw Head

The basic pattern of a regular torx with six points, resembling a star, is found on its tamper proof version as well. What makes it different and tamper resistant in nature is the small tip in the center of the outer shape. Despite its different types of applications, torx security fasteners are most commonly used in electronic gadgets.

Snake Eyes Spanner Screw Head

As the name indicates, this type of security fasteners has two holes on opposite ends around a screw head. Basically, it has two notches opposite each other, close to the inner circumference of the head. It is practically impossible to use any basic screw driver or similar tool to remove snake eyes tamper resistant screws.

Hex Screw Head

A Hex screw head in the tamper proof category has a hexagonal shape which may seem to be very similar to regular screws that are resistant to tampering. However, these security fasteners have a risen tip or post in the middle which requires a different mechanism for installing and removing them.

Other Structural Options

Apart from the different patterns and additional metal posts on security fasteners, the external structure and shape of the screw head also has multiple options. Some of these are explained below:

Truss Screw Head

The lower base of this screw head is flat which may reach lesser depth but its upper, encircled surface provides high strength and security against unauthorized removal.

Flat Screw Head

Similar to the oval shaped screw head, this type can recess in greater depth within countersinks. But, its upper structure is particularly flat which lowers its visibility.

Bolting Systems & Tools

The method to install, tighten and remove security fasteners is a lot different than that of ordinary, tamper resistant screws. The use of specific tools and screw drivers for working with security fasteners results in a unique bolting system that is impossible to tamper with inadequate mechanism. In short, fastening and removal of tamper resistant screws requires a highly secure system with fairly uncommon devices and instruments.

These tools are designed to have a steady grip on tamper resistant screws, depending on their screw head type and design. These instruments have a shape that match specific type and dimensions of security fasteners and have definite slots to fit around distinguishing metal posts. Needless to say, the use of such specialized tools to fasten and tighten tamper resistant screws forms the essence of these fixtures. Any fastener or screw that can tamper proof a product or appliance must come with its own, exclusive bolting system.

Various Applications

The use of tamper proof screws has a wide scope of application. This means that there are plenty of devices and systems that should be designed with these fixtures to make the end product extremely safe for a variety of purposes. Sometimes the safety requirements come from the needs of the customers or users of the product. In other cases, customers wish to keep the people around them safe and prevented from any possible injury from certain products them safe from any risks of injury. It could be their family members or possibly any individual who may have easy access to the certain device.

In completely different scenarios, there are certain products in every household that can either become subject to theft themselves or lead to compromised security which may result in theft of other valuable belongings. When any of these items are designed to be tamper proof through the use of security fasteners, people reap the benefits of high security against any act of vandalism or robbery.

Basically, the purpose fulfilled by the use of security fasteners in different products and systems makes these fixtures the center of attention for the manufacturing companies. On the other hand, there is another form of application for these fasteners which is rather infrequent. It is the use non-commercial or domestic use of tamper resistant screws for DIY projects. Likewise, domestic projects that are being personally monitored by the owners can also involve special request to use tamper resistant screws for additional security.

Electrical Appliances

This is a common product category for which tamper resistance is an essential feature. Although basic precautionary measures are related to the usage of several gadgets, there is always the risk of injury associated with deliberate or unintended interference with their internal mechanism. As one would expect, if any individual is able to open up an electrical appliance there is a high potential of hazard, accident, or injury.  

Security Systems & Related Components

Whether people install security systems or it is the basic form of residential safety through secure entry points, the use of tamper resistant fasteners is a crucial step. For example, these screws in safes used by home users greatly reduce the possibility of theft. They also prevent misuse of weapons by adding further security to gun safes. Other applications are related to using security fasteners in doors, windows, hinges, cupboards, locks, etc.


All in all, security fasteners are categorically a fundamental component in the safety strategy used in the design of any product. Not only do they result in high safety of the end users of such products and systems, but also add to the reliability and positive image of their manufacturers and vendors alike. Please shop our Tamper Proof Screw Store below. 

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Thread Cutting Screws

Buy Thread Cutting Screws Here

A thread cutting screw is a type of self tapping screw – in that it both taps and fastens in a single operation. And unlike a thread rolling screw which displaces/deforms the material in the newly formed thread path, thread-cutting screws physically remove the material into which they are driven as they form new mating threads.

Main Features of Thread Cutting Screws:

  • Ideal for use in a variety of plastics, resins and metals
  • Variety of head styles, drives and materials to suite specific applications
  • A thread-cutting slot provides a sharp serrated cutting edge to form a perfect mating thread
  • Blunt point necessitates a pre-drilled pilot hole

Advantages of Thread Cutting Screws:

  • Eliminates the need for a separate tapping operation
  • Thread profile improves integrity of mated threads
  • Improved thread engagement for long-term use
  • Reduced radial and hoop stresses in the boss for prolonged usage
  • Reusable with continued performance

Thread Cutting Screws In Stock at Aspen Fasteners:

Thread-cutting screws come in a variety of head styles, drive types, materials and platings. The threading and point differentiate the types, with types 1, F, 23 and 25 being the most common. Simply click on the image to see the head/drive options available.

 

Thread Cutting Screws – Type 1

Thread Cutting Screws Type 1

  • Machine screw thread
  • Blunt point
  • Single cutting edge
  • Use in sheet metals, structural shapes, alloys and plastics
  • Also available in stainless steel

 

Thread Cutting Screws – Type F

Thread Cutting Screws Type F

  • Machine screw thread
  • Blunt point
  • Multiple cutting edges
  • Use in heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic.
  • Also available in stainless steel

 

Thread Cutting Screws – Type 23

Thread Cutting Screws Type 23

  • Machine screw thread
  • Blunt point
  • Tapered entering threads
  • Single wide cutting edge with a chip cavity
  • Use in cast iron, zinc and aluminum die castings and plastics
  • Provides maximum thread cutting area and excellent chip clearing
  • Also available in stainless steel

 

Thread Cutting Screws – Type 25

Thread Cutting Screws Type 25

  • Coarse Type B thread
  • Blunt point
  • Tapered entering threads
  • Single wide cutting edge with a chip cavity
  • Use in plastics and other soft materials
  • Provides maximum thread cutting area and excellent chip clearing
  • Also available in stainless steel

24 Hour Delivery Door-To-Door Service With UPS

Aspen Fasteners stocks full lines of thread cutting screws in addition to most other screws, nuts, bolts and washers. Available for same day shipping from distribution centers across the USA. And remember, it’s always free shipping. Expedited next day delivery is also available for those rush requirements.

For detailed technical specifications click here.

If you don’t see what you are looking for, please contact us and we’ll be happy to help you find what you need.

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Weld Screws

 

Weld screws are of two types: projection weld and spot weld. Both involve resistance welding principles where the welded joint is achieved by electrical resistance flow through the joint held under electrode pressure.  Weld screws are ideal for providing quick, strong and permanent bonds to metal surfaces.

Projection Weld Screws

The two surfaces of the welded joint are held together by pressure from the welding electrodes.  Electrical current passing through the electrodes causes the projecting metal of the screw head to melt and fuse with the adjacent metal surface thereby forming the welded joint.

The projections on weld screws are located either under or on top of the head of the screw each being preferable for specific applications. Different types of projections are also available:

  • Button type
  • Cone type
  • Spherical type

The different projection types directly affects the heat generated during the welding process and effects the properties of the final welded joint. This of course influences the type used for different surfaces and materials. For instance,  button type projections are ideal for joining thin flat metal sheets;  cone type projections are used on thicker materials; and spherical type projections are ideal for thicker metal plates.

Advantages of Projection welding:

  • Numerous welded joints can be performed simultaneously
  • Surface conditions and finishes (rust, coating, oil etc.) do not affect this welding process
  • Electrode life is longer than spot welding
  • Improved temperature control for different material composition and thickness

Spot Weld Screws

Spot welding involves placing the spot weld screw and the surface on to which it is to be welded between two welding electrodes.  An electric current is passed through the electrode tips producing sufficient heat to fuse the metals together forming the welded joint. In spot welding, the heat generated depends on the size and shape of the electrode tips rather than on the size, shape and the number of projections used.

The size and shape of the welding electrode tip directly influences the size of the weld, and therefore also determines the final strength of the welded joint. For this reason, welding electrode tip diameters must be changed for each thickness of metal to be welded.

Advantages of spot welding

  • Free of fumes and splatter
  • Easy to use operating equipment
  • Simple and Quick process
  • Low cost

Another potentially important advantage of spot welding is it can be used to weld fasteners to assemblies also being spot welded. This minimizes setup time and costs and maximizes the use of the spot welding equipment.

Weld Screws In Stock at Aspen Fasteners:

 

Weld Screws – Projections Over Head

Weld Screws - Projections Over Head

  • Three projections on top of the head 120° apart
  • For welding to the surface of a steel plate
  • Eliminates the need for holes in the surface material
  • No screw head protrudes through the surface
  • The exterior surface remains virtually unmarred
  • Ideal for applications where product appearance or potential leakage is a consideration
  • Ideal in blind locations as the screw can be pre-welded in place.

 

Weld Screws – Projections Under Head

Weld Screws - Projections Under Head

  • Three projections under the head 120° apart
  • Allows for flush mounting
  • For through hole applications
  • The through hole allows self alligning
  • Eliminates the need for fixturing.

 

 

Weld Screws – Spot Weld Type

Weld Screws - Spot Weld Type

  • Has a flat spade perpendicular to the thread
  • Ideal for confined areas such as narrow channels, corners and in applications requiring thread offset from component surfaces
  • This screw is easy to position and produces a strong weld

 

 

24 Hour Delivery Door-To-Door Service With UPS

Aspen Fasteners stocks full lines of steel weld screws screws in addition to most other screws, nuts, bolts and washers. Available for same day shipping from distribution centers across the USA. And remember, it’s always free shipping. Expedited next day delivery is also available for those rush requirements.

For detailed technical specifications click here.

If you don’t see what you are looking for, please contact us and we’ll be happy to help you find what you need.

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U-Drive Screws (Hammer Drive Screws)

U-drive self-tapping screws, also known as hammer drive screws, are often used for attaching nameplates in castings and for sealing drain holes in corrosion proofing tubular structures. They are more comparable to nails than screws as the head is not slotted or recessed and they are driven into mating parts with a mallet or hammer for a quick and permanent assembly.

 

Main Features

  1. Unslotted Round Head
  2. Multiple start threads with a large helical angle
  3. Unthreaded pilot point
  4. Not intended to be removed after installation

 

Key Considerations When Considering U-Drive Screws:

  1. Must be harder than mating part
  2. Pre-drilled pilot hole required
  3. No tapping required
  4. For permanent assemblies
  5. Sufficient space for installation with a mallet or hammer

 

U-Drive Screws In Stock at Aspen Fasteners:

 

24 Hour Delivery Door-To-Door Service With UPS

Aspen Fasteners stocks full lines of u-drive screws in steel and stainless steel  in addition to most other screws, nuts, bolts and washers. Available for same day shipping from distribution centers across the USA. And remember, it’s always free shipping. Expedited next day delivery is also available for those rush requirements.

For more detailed information on U-drive screws and product specifications click here.

If you don’t see what you are looking for, please contact us and we’ll be happy to help you find what you need.

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Lock Nuts

Many different types of lock nuts are available for use in a wide range of applications.  While their underlying mechanisms might vary, they all have one thing in common: they produce additional resistance to vibrational loosening forces without using lock washers which improves efficiencies in many manufacturing processes.

 

Lock nuts typically fall into one of two groups:

  1. PREVAILING TORQUE – an intrinsic feature of the lock nut produces friction between threads of mated components thereby increasing the resistance to loosening forces. The two main categories of prevailing torque type nuts include: all metal and nylon insert lock nuts.
  2. SURFACE-BEARING – a free spinning nut that requires tightening against a bearing surface in order for the locking mechanism to function. Two common surface bearing type lock nuts include: serrated flange and KEPS (K-Lock)

1-Prevailing Torque Type Lock Nuts:

All metal prevailing torque type lock nuts achieve their prevailing torque by altering the shape of the nut in some way – most commonly by distorting the threads of the nut which then bites into the mating part when tightened. These include: 2-way reversible lock nuts, Flex-Type Lock Nuts, Stover Lock Nuts.

A one piece all metal prevailing torque type hex nut with two or three equally spaced round or rectangular impressions compressed into the flat sides of the nut. These compressions create slight distortion in the internal threading that results in an increased resistance when tightened onto mating threads.  Two way reversible lock nuts are considered “two way” because they can be installed in either orientation (top up, top down) These nuts are also referred to as  center lock nuts, and are ideal for production and automated assembly. As a result the locking of the mating part occurs in the center of the nut. This saves on screw length, because threads need not protrude from the nut to lock securely. Since they are all-metal, they are more resistant to higher temperatures and chemical exposure than non-metallic lock nuts (such as nylon insert lock nuts).

FLEX-TYPE LOCK NUTS
Example of a flex-type lock nut

 A one piece all metal prevailing torque type hex lock nut with six equally spaced opposing slots aligned with the corners of the nut that are cut into a cylindrical section of slightly smaller diameter at the top of the nut. It is this slotted section that locks the nut in place by increasing resistance to loosening forces when tightened onto a mated thread.  These are considered as one-way because they can only be installed one way – top up.Since they are all-metal, they are more resistant to higher temperatures and chemical exposure than non-metallic lock nuts (such as nylon insert lock nuts).

GRADE C STOVER EQUIVALENT LOCK NUTS
Example of a grade C stover equivalent lock nut

A one piece all metal prevailing torque type hex lock nut with a conical top with chamfered corners. The resistance to loosening forces is created by distortion in the top threads.  These are considered as one-way because they can only be installed one way – top up. Since they are all-metal, they are more resistant to higher temperatures and chemical exposure than non-metallic lock nuts (such as nylon insert lock nuts).

NYLON INSERT LOCK NUTS
Example of a nylon insert lock nut

Nylon insert torque prevailing type lock nuts contain a captive (permanent) undersized nylon (or other polymer) insert that grips the mating threads when tightened and generates the prevailing torque. The nylon insert also dampens vibration between the bolt and nut further securing the mated components and provides a gas and moisture seal. Because the threads of the mating bolt deform but do not cut into the nylon so nylon insert lock nuts may be re-used a limited number of times. These nuts are considered one-way lock nuts because they can only be installed one-way—top up.  Unlike all-metal nuts, the nylon insert limits the use at elevated temperatures or when exposed to certain chemicals.

2-Surface-Bearing Lock Nuts:

 SERRATED FLANGE
Example of a serrated flange lock nut

A one piece all-metal lock nut with a flanged bearing surface that increases the surface area substantially and has circular serrations radiating outwards.  Unlike prevailing torque tyes, this bearing lock nut does not lock onto mating threads. It is a free spinning nut until the serrations contact and displace material on the mating surface upon tightening. Depending on surface finish, localized surface corrosion may occur.  The serrations are designed not to interfere with the tightening of the nut, but once tightened against a bearing surface, the teeth produce a ratchet-type locking mechanism resistant to vibrational and other loosening forces.  The serrated flange eliminates any need for a washer or lock washer. The increased flange size relative to the rest of the nut distributes the load over a greater area. Furthermore it is ideal for irregular or over-sized holes.  Since they are all-metal, they are more resistant to higher temperatures and chemical exposure than non-metallic lock nuts (such as nylon insert lock nuts).

 K-LOCK (KEPS)
Example of a K-Lock nut

An all-metal hex nut pre-assembled with a free spinning lock washer often external tooth. Unlike prevailing torque types , this bearing lock nut does not lock onto mating threads.  Rather it is a free spinning nut that must be firmly tightened against a bearing surface so the teeth of the lock washer can bite into the surface onto which it is being tightened.  It is the washer that resists vibrational loosening forces. Depending on surface finish, localized surface corrosion may occur as the lock washer bites into and removes the surface treatment.  Since they are all-metal, they are more resistant to higher temperatures and chemical exposure.

Key Considerations When Choosing Specific Styles of Lock Nuts:

  • Select the correct lock nut for the specific task at hand
  • Good design ensures savings in the long run
  • Re-use (need to disassemble/reassemble components)
  • Localized corrosion – (Surface finish onto which the nut is tightened)
  • Length of thread exposure (top-lock vs center-lock)
  • Exposure to chemicals
  • Exposure to extreme temperatures
  • Size and shape of hole

 

24 Hour Delivery Door-To-Door Service With UPS

Aspen Fasteners stocks full lines of lock nuts in steel. stainless steel and metric  in addition to most other screws, nuts, bolts and washers. Available for same day shipping from distribution centers across the USA. And remember, it’s always free shipping. Expedited next day delivery is also available for those rush requirements.

For more detailed information on Lock Nuts and product specifications click here.

If you don’t see what you are looking for, please contact us and we’ll be happy to help you find what you need.

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SEMS Screws

Washers are often used in combination with screws to improve the structural integrity of an assembly. Typically, they are separate components. However pre-assembled screws and washers – the SEMS screw, have simplified and improved efficiencies in many manufacturing processes.

What is a SEMS Screw?
A SEMS Screw is a generic term used to describe a screw pre-assembled with a free-spinning lock washer. It is a permanent assembly with the washer held in place by the major diameter of the screw thread being larger than the hole of the washer. The SEMS screw is simple, easy to use and available in many different styles making it well suited for many applications.

Advantages of the SEMS Screw:

  • Low cost and widely available
  • Increases productivity by eliminating hand assembly of individual components
  • Permanent assembly assures that the washer is not dropped, lost or forgotten
  • Ease of use with hand drivers and in automated production programs
  • Available in most screw and washer combinations

Key Considerations When Choosing SEMS Screws:

  • Select the correct configuration for the specific task at hand
  • Good design ensures savings in the long run
  • Proper finishes perform optimally and are aesthetically pleasing
  • Ease of use, particularly in difficult spaces

 

SEMS Screws In Stock at Aspen Fasteners:

 

External Tooth SEMS

Example of an external tooth lock washer sems screw

  • Generates and maintains tension
  • Absorbs torque and prevents slipping
  • Opposes loosening rotation of the screw
  • Absorbs shock and vibration
  • Ideal for larger head screws (round, pan, binding, etc.)
  • When exposed/visible teeth are not a concern
  • Maximizes torsional resistance due to larger radius

 

Internal Tooth SEMS

Example of an internal tooth lock washer SEMS screw

  • Generates and maintains tension
  • Absorbs torque and prevents slipping
  • Opposes loosening rotation of the screw
  • Absorbs shock and vibration
  • Ideal for smaller screw heads (such as fillister heads)
  • Where teeth need to be hidden for function and/or aesthetics
  • Reduces snagging or scratching

 

 

Split Lock Washer Sems

Example of a split lock washer SEMS screw

  • Generates and maintains tension
  • Absorbs torque and prevents slipping
  • Opposes loosening rotation of the screw
  • Absorbs shock and vibration
  • Preferred for use with hardened bearing surfaces

 

Square Cone® Washer Sems

Example of a square cone® lock washer SEMS screw

  • Higher retained clamp load
  • Improved compensation for thermal cycling and vibration
  • Maintains spring action and generates constant load even under high tension
  • Enhances flexibility in component design
  • Ideal for clamping fragile materials and preventing stress cracking around clearance holes
  • Ideal for large clearance holes

24 Hour Delivery Door-To-Door Service With UPS

Aspen Fasteners stocks full lines of SEMS screws in steel. stainless steel and metric  in addition to most other screws, nuts, bolts and washers. Available for same day shipping from distribution centers across the USA. And remember, it’s always free shipping. Expedited next day delivery is also available for those rush requirements.

For more detailed information on SEMS screws click here.

If you don’t see what you are looking for, please contact us and we’ll be happy to help you find what you need.

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Stainless Steel Fasteners (Screws, nuts, bolts, washers)

Stainless Steel’s resistance to staining and corrosion, its low maintenance, low cost, brilliant shine and strength make it the perfect material for a variety of fasteners and applications.

What is Stainless Steel:

The magic ingredient in stainless steel is chromium. When added to steel in sufficient amount (minimum 11%),  chromium forms of a microscopic, tough, invisible, chromium oxide film on the steel surface that is resistant to scratches and corrosion and is exceptionally hygenic and easy to clean.

Carbon steel rapidly oxidizes when exposed to air and moisture. The iron oxide film (rust) accelerates corrosion by promoting more iron oxide formation. In contrast, chromium oxide blocks corrosion or rust from spreading into the alloy’s internal structure.

When to Choose Stainless Steel Fasteners:

  • Cost savings over the longer term.
  • Exposure to corrosive environments (eg harsh chemicals, sea coast).
  • Very low temperature environments prevent brittleness.
  • Extremely high temperature environments to maintain material strength.
  • When frequent tightening/loosening/removal of the fastener is expected.
  • When high strength over weight is important.
  • Where hygenic/easy cleaning is a essential.
  • When aesthetics are desired. It does not rust or tarnish and plating is not necessary.

Key Considerations When Choosing Stainless Steel Fasteners:

  • Select the correct grade for the specific task at hand.
  • Proper design guarantees savings in the long run (time and money).
  • Good finishes perform and look better.
  • Minimal maintenance required, and prolonged life span.

Benefits of Stainless Steel Fasteners:

  • Value over the long term.
  • Low maintenance.
  • Common and Available.
  • Corrosion Resistant.
  • Strong.
  • Aesthetics.

For detailed information regarding stainless steel and stainless steel fasteners, including the chemical composition, mechanical and physical properties,  tensile and yield strengths, torque values and shear strengths, click here

Stainless Steel Fasteners In Stock at Aspen Fasteners:

 

Stainless Steel Carriage Bolts
Stainless Steel Carriage Bolts

Stainless Steel Flange Bolts
Stainless Steel Flange Bolts

Stainless Steel hanger Bolts
stainless steel hanger bolts

Stainless Steel hex tap Bolts
stainless steel hex tap bolts

Stainless Steel Spring Nuts
stainless steel spring nuts

Stainless Steel Cage Nuts
stainless steel cage nuts

Stainless Steel hex Nuts
stainless steel hex nuts

Stainless Steel lock Nuts
stainless steel lock nuts

Stainless Steel Nylon Insert Lock Nuts
stainless steel nylon insert nuts

Stainless Steel Spring Nuts
stainless steel spring nuts

Stainless Steel Weld Nuts
stainless steel acorn cap nuts

Stainless Steel Wing Nuts
stainless steel acorn cap nuts

Stainless Steel Deck Screws
stainless steel deck screws

Stainless Steel Hi Lo Tapping Screws
stainless steel hi lo screws

Stainless Steel lag Screws
stainless steel lag screws

Stainless Steel machine Screws
stainless steel machine screws

Stainless Steel plastite Screws
stainless steel plastite screws

Stainless Steel Self Drilling Screws
stainless steel self drilling screws

Stainless Steel Self Piercing Screws
stainless steel self piercing screws

Stainless Steel Self Tapping Screws
stainless steel self tapping screwss

Stainless Steel Sems Screws
stainless steel sems screws

Stainless Steel Taptite Screws
stainless steel Taptite Screws

Stainless Steel Thread Cutting Screws
stainless steel Thread cutting screws

Stainless Steel Thumb Screws
stainless steel thumb screws

Stainless Steel U Drive Screws
stainless steel u drive screws

Stainless Steel Wood Screws
stainless steel wood screws

Stainless Steel Countersunk Finishing Washers
stainless steel Countersunk Finishing Washers

Stainless Steel Flat Washers
stainless steel flat washers

Stainless Steel lock Washers
stainless lock washers

Stainless Steel tooth lock Washers
stainless steel tooth lock washers

24 Hour Delivery Door-To-Door Service With UPS

Aspen Fasteners stocks full lines of stainless steel screws, nuts, bolts and washers available for same day shipping from distribution centers across the USA. And remember, it’s always free shipping. Expedited next day delivery is also available for those rush requirements.

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Square Drive Screws

The square drive recess was the first recess-type drive developed for large scale screw production. Today, a century later, square drive screws and the driver bits are now widely available, economical and offer many advantages over other drive systems:

 

For higher torque applications:

The geometry of the square drive allows for the delivery of greater torque to the screw head by providing an improved contact area with the surface of a properly inserted driver bit. Consequently, the driver bit resists cam out. For this reason, the square drive is often preferred for applications where greater torque is required (eg. woodworking). Furthermore since the driver bit sits better in the square recess, there is also less slippage and reduced marring of the surface of the material into which the screw is being inserted.

 

For greater ease of use:

Since it is a square recess, there are four possible positions to insert the driver making it effectively self-aligning. Also because of the shape and depth of the recess, the screw remains on the driver bit making it ideal for use in tight spaces and for single hand insertion. For more information and technical specifications of the square drive recess (Robertson drive) click here

 

 Over 30 complete lines of fasteners with square drives:

Aspen Fasteners offers many complete lines of screws (over 2000 parts) with square drives from stock in steel and stainless steel including:

  Deck Screws
square drive deck screw

Drywall Screws
square drive drywall screw

Machine Screws
square drive machine screws

Self-Drilling Screws
sqaure drive self drilling screws

Self-Tapping Screws
square drive self tapping screws


Thread Cutting Screws
square drive thread cutting screws

Wood Screws
square drive wood screws

24 hour delivery door-to-door service with UPS

Aspen Fasteners stocks full lines of square drive screws available for same day shipping from distribution centers across the USA. And remember, it’s always free shipping. Expedited next day delivery is also available for those rush requirements.

If you don’t see what you are looking for, please contact us and we’ll be happy to help you find what you need.

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Wood Screws

Example of a wood screw

Our featured product for this month is the wood screw – an economical and commonly available screw used to join two pieces of wood together or thin non-wood products to wood (eg hardware, hinges etc).

Thread and Point:

Specialized thread profile with sharp, coarse, and widely spaced threads designed to minimize the effort needed to drive the screw into wood while maximizing the withdrawal load.

Wood screws have a gimlet point – a threaded, sharp cone point ideally suited for easy penetration into wood.  For very hard woods, specialized points are available, like the type 17 point, which improves displacement of the material into which it is being driven, consequently reducing the force needed to insert the screw.

Example of a wood screw with type 17 point

Type 17 point

Head Types:

Most common head types are: flat, oval and round, flat heads being the most frequently used because the head remains flush with the surface once inserted into the material. When countersunk, flat head screws can be easily hidden using  plugs. For more decorative finishes, oval and round heads are preferred (see Table 1 for head dimensions).

Table 1. Wood Screw Head Dimensions

Nominal Screw Dia. TPI Basic Screw Diameters Average Head Diameters
Flat & Oval Head Dia. Round Head Dia.
Decimal Fraction Decimal Fraction Decimal Fraction
#0 32 0.060 1/16 0.109 7/64 0.106 7/64
#1 28 0.073 5/64 0.135 9/64 0.130 1/8
#2 26 0.086 3/32 0.160 5/32 0.154 5/32
#3 24 0.099 3/32 0.185 3/16 0.178 11/64
#4 22 0.112 7/64 0.210 13/64 0.202 13/64
#5 20 0.125 1/8 0.236 15/64 0.227 7/32
#6 18 0.138 9/64 0.262 17/64 0.250 1/4
#7 16 0.151 5/32 0.287 9/32 0.275 9/32
#8 15 0.164 5/32 0.312 5/16 0.298 19/64
#9 14 0.177 11/64 0.337 11/32 0.323 21/64
#10 13 0.190 3/16 0.363 23/64 0.347 11/32
#12 11 0.216 7/32 0.414 13/32 0.395 25/64
#14 10 0.242 15/64 0.480 31/64 0.443 7/16
#16 9 0.268 17/64 0.515 33/64 0.491 31/64
#18 8 0.294 19/64 0.602 19/32 0.539 17/32
#20 8 0.320 5/16 0.616 39/64 0.587 19/32
#24 7 0.372 3/8 0.724 23/32 0.683 11/16
NOTES:
1. All dimensions are in inches, unless otherwise noted.
2. For reference only

 

Main features of Wood Screws:

  • Designed for use in wood.
  • Variety of head styles, drives and materials to suite specific applications .
  • Gimlet point for more effective screw penetration.
  • Thread profile improves grip, reduces stripping and pull-out.
  • Easily removed to conveniently disassemble joined components.
  • Improved finished appearance.

Types:

Aspen Fasteners stocks a full line of steel as well as 18-8 stainless steel wood screws available for same day shipping from our distribution centers across the USA. And remember, it’s always free shipping.

Flat Head Wood Screws:

Flat Head Phillips Drive
Flat Head Phillips Drive
Material: Steel, Stainless Steel
Plating: Zinc, Black Oxide
Flat Head Phillips Drive
Flat Head Slots Drive
Material: Steel
Plating: Zinc
Flat Head Phillips Drive
Flat Head Square Socket Drive
Material: Steel
Plating: Zinc

Oval Head Wood Screws:

Flat Head Phillips Drive
Oval Head Phillips Drive
Material: Steel, Stainless Steel
Plating: Zinc, Black Oxide
Flat Head Phillips Drive
Oval Head Slots Drive
Material: Steel
Plating: Zinc

Round Head Wood Screws:

Flat Head Phillips Drive
Round Head Phillips Drive
Material: Steel, Stainless Steel
Plating: Zinc, Black Oxide
Flat Head Phillips Drive
Round Head Slots Drive
Material: Steel
Plating: Zinc

For more information about wood screws including thread types, drive styles, pilot hole sizes click  here.

Call us, email us or chat-on-line with any question you might have:

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Black Oxide Finish


Flat Phillips Drive Machine Screw – Black Oxide Finish
Example of a Black Oxide Finished Screw

Black oxide finished screws commonly used in electronics.

 

Clients often ask us about the difference between black oxide and other available black coatings on fasteners. We thought a brief review on black oxide would be useful.

A conversions coating

Black oxide coating is a low cost conversion coating produced by chemically altering the surface of a metallic substrate. The result is a decorative matte black finish with many useful properties.

Black oxide offers dimensional stability

This treatment has virtually no effect on the dimensional aspects of the part, adding only 5 to 10 millionths of an inch to the fastener’s dimensions.

A lasting finish

Because it is a chemical modification of the metal substrate itself, it is very stable even at high temperatures and does not chip, peel or rub off and resists abrasions better than black phosphate or zinc coating.

Moderate corrosion resistance

Black oxide by itself provides virtually no protection against corrosive environments. Additional treatments like oil or wax are needed for corrosion resistance. But even with oil or wax, black oxide only offers moderate protection and as such is ideally suited for indoor applications.

No white rust

An important property of black oxide, unlike some electroplated finishes, is that white rust does not form over time on the finish. Since the formation of white rust is a risk factor for electrical shorts, black oxide fasteners are often preferred in the electronics industry.

Elliminates the risk of hydrogen embrittlement

The conversion coating process does not involve known risk factors contributing to hydrogen embrittlement and material failure in certain types of fasteners. Consequently, no additional treatments are necessary to address this concern.

Types

Aspen Fasteners offers full lines of many different types and styles of black oxide finished fasteners suitable for a variety of applications. The lines include but are not limited to:

Available from stock

All parts are stock and available for same day shipping from our distribution centers across the USA and Canada. And remember, it’s always FREE shipping.

Read about black oxide and other finishes in greater detail here.

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