The Bolt Guide

Square Head Bolts
Grade 2

Battery (Square Head) Bolts
Flat Slotted
Cap Screw

Flat Slotted Cap Screw
Hex Cap Screw
Grade 2

Hex Cap Screw
Also known as a Battery Bolt. The Square head offers greater bearing surface for wrenching than standard hex head bolts. Flat Cap Screws are most often used for assembling close tolerance machinery where head clearance is critical. Grade 2 Steel used in non-critical applications where not subject to extreme temperatures or excessive stress.
- Zinc - Zinc - Zinc
- 18-8 Stainless Steel
- 316 Stainless Steel
- Black Oxide
     
Hex Cap Screw
SAE J429 Grade 5

Hex Head Cap Screw Bolts Grade 5 Steel Zinc
Hex Cap Screw
SAE J429-Grade 8

Hex Cap Screw Bolts Grade 8 Yellow Zinc
Studs
B7 Steel

Hex Cap Screw
Grade 5 used when greater tensile strength needed. Yield-to-tensile ratio is the lowest of all heat treated steels. Greater tensile strength than Grade 2 or Grade 5. For use in high stress applications. Grade 2 Steel used in non-critical applications where not subject to extreme temperatures or excessive stress.
- Zinc - Yellow Zinc - Plain Steel
     
Carriage Bolts Square Neck
Mild Steel

Carriage Bolts, Square Neck, Mild Steel
Carriage Bolts, Square Neck
Grade 5

Carriage Bolts, Square Neck, Grade 5 Steel
Carriage Bolts, Square Neck
Grade 8

Carriage Bolts, Square Neck, Grade 8 Steel
Mild Steel used for non-critical applications where cost is a consideration or it is preferred that the fastener shear/deform before the fastened objects. Square Neck keeps the bolt from turning as the nut is tightened. Also known as “Shaker Screen Bolts”. Grade 5 Steel used when greater tensile strength is needed. The Square Neck keeps the bolt from turning as the nut is tightened. Grade 8 Steel used for greater tensile strength than Grade 2 or Mild/A307 Steel. Square Neck keeps the bolt from turning as the nut is tightened
- Zinc
- Stainless Steel
- Galvanized Steel
- Black Oxide
- Zinc - Yellow Zinc
     
Carriage Bolts
Flat Head

Carriage Bolts, Flat Head
Carriage Bolts
Ribbed Neck

Carriage Bolts, Ribbed Neck
Track Bolts
Ribbed Neck

Hex Cap Screw
Square Neck keeps the bolt from turning as the nut is tightened. Flat Head allows a lower profile Ribbed Neck used in softer materials to keep the bolt from turning when the nut is being tightened. Designed specifically for use in the installation of garage doors. Ribbed Neck used in softer materials to keep the bolt from turning when the nut is being tightened.
- Zinc
- Plain Steel
- Zinc - Zinc
     
Step Bolts

Step Bolts
Elevator Bolts

Elevator Bolts
Turned, Open End
Eye Bolts

Turned Open End Eye Bolts
For use in softer materials as the larger diameter head will not pull through. Also preferred for its lower profile. Commonly used in conveyor/elevator systems. Large head also preferred where low profile required. To use as a temporary, light duty fastening system. Also known as Bent Bolts or Turned Eye Bolts.
- Zinc - Zinc - Zinc
     
Plow Bolts # 3 Head
Grade 5

Plow Bolts Number 3 Head Grade 5
Plow Bolts #3 Head
Grade 8

Plow Bolts Number 3 Nead Grade 8
Serrated Hex Flange Screws
Grade 5 & Case Hardened

Serrated Hex Flange Screws Grade 5 Case Hardened
Grade 5 Steel for medium wear. Countersunk flat head with square necks allow better resistance to the wear from heavy duty applications. Grade 8 Steel for heavy duty wear. Countersunk flat head with square necks allow better resistance to the wear from their heavy duty applications. Locking Serrations keep a tight grip when loosening forces are present. Flanged Head provides greater bearing surfuce and eliminates need for a washer.
- Zinc - Plain Steel - Carbon Steel, Zinc
- Grade 5 Steel, Zinc
- Stainless Steel
- Black Oxide
     
Flange (Frame) Bolts
SAE Grade 8

Flange Frame Bolts SAE Grade 8
Structural Bolts
ASTM-A325

Structural Bolts ASTM A325
Hanger Bolts

Hanger Bolts
Generally used for automotive applications. Flanged head provides greater bearing surface and eliminates the need for a washer. For use in heavy duty construction applications. 120/105 ksi minimum tensile strength as per ASTM international standards. Part wood screw, part machine screw. Also known as Table Leg Bolts as they are often used in furniture manufacturing.
- Steel Black Phosphate - Plain Steel
- Galvanized Steel
- Full Thread, Zinc
- Partial Thread, Zinc
- Full Thread, Stainless Steel
- Partial Thread, Stainless Steel
     
     
Tap Bolts (Full Thread)
Grade 2

Tap Bolts Full Thread Grade 2
Tap Bolts (Full Thread)
Grade 5

Tap Bolts Full Thread Grade 5
Tap Bolts (Full Thread)
Grade 8

Tap Bolts Full Thread Grade 8
A307 steel for non-critical applications. Generally used in pre-tapped holes where application requires a fully threaded bolt. Grade 5 for higher tensile strength. Generally used in pre-tapped holes where application requires a fully threaded bolt. Often used in light automotive applications. Part wood screw, part machine screw. Also known as Table Leg Bolts as they are often used in furniture manufacturing.
Zinc - Zinc - Yellow Zinc
     
Hex Cap Screw
Partially Threaded
Metric DIN 931

Hex Cap Screw Class 8.8 or 10.9 Metric DIN 931
Hex Cap Screw
Full Threaded
Metric DIN 933

Hex Cap Screw Class 8.8 or 10.9 Metric DIN 933
Flange Bolts
Metric DIN 6921

Flange Bolts Metric DIN 6921

Partially threaded. DIN Metric Standard. DIN Grade 10.9 (similar to Grade 8) has a greater tensile strength than Grade 8.8 (similar to SAE Grade 5). Fully threaded. DIN Metric Standard. DIN Grade 10.9 (similar to Grade 8) has a greater tensile strength than Grade 8.8 (similar to SAE Grade 5). DIN Metric Standard. Flanged head style provides greater bearing surface and eliminates need for washer.
- Class 8.8, Zinc
- Class 10.9, Plain Steel
- Class 8.8, Zinc
- Class 10.9, Plain Steel
- Grade 8.8, Zinc
- Class 8.8, Plain Steel
- Class 10.9, Black Phosphate
- Class 10.9, Plain Steel
     
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10 Responses to The Bolt Guide

  1. Sam Diaz says:

    Dear Sirs,

    Copper Energy Mexico SA de CV is a Mexico based company. We are Importers, Distributors, and Commercial Agents, supplying industrial materials and tools to Manufacturing plants, Factories and general industries all over the Mexican territory.

    At present time we have an urgent request for:

    Grade 5 Cap Screw – Full Thread

    Specification Qtty

    3/8-16 x 2 ½” 3,000 pcs
    3/8-16 x 3 ½ “ 3,000 pcs
    ½-13 x 2 ½ “ 3,000 pcs
    5/8-11 x 3” 5,000 pcs
    5/8-11 x 3 ½ “ 1,000 pcs
    5/8-11 x 2 ½ “ 3,000 pcs

    Please provide export price list.

    This would be our initial order, and we plan to re-order with high frequency and higher quantities.

    Regards,
    Sam Diaz
    samdiaz@copperenergymex.com
    http://www.copperenergymex.com
    Tel: 525528934026
    Skype: tradeintl1

  2. tr says:

    thanks for your response but those are not what I am looking for. Imagine a bolt that looks like
    http://fastenerstation.com/showroom/index.php?cPath=23

    this low head screw but instead of the allen head drive it is flush on the top. It is held by changing the circular shape to an oval (but not recognizable). the other end take what ever nut you desire. So the driver, to hold it, is the opposite of the oval. In other words an inside oval (similar to a socket wrench but smooth and ovular. Is that clearer?

  3. tr says:

    I suppose you are right it is most like a T-Bolt but the top is flat and more like the bolt that I mentioned previously. I am thinking it most looks like a binder bolt but with a higher profile.

    The problem with side gripping (bolt) the hole is that it is going into a plastic resin material known as 3form which, I fear, is not forgiving and will likely crack when pressure is put on it.

  4. tr says:

    thanks I’ll check that out

    on another project do you know of a inexpensive source of a “house-mate 7mm x 50mm hex in zinc or chrome ?

    • Expert says:

      From what I can tell, “house-mate” seems to be a Home Depot brand so finding the specific part you are looking for was relatively easy:

      http://www.homedepot.com/h_d1/N-5yc1v/R-202105609/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053

      The generic description to the part you are looking for would be a Pancake Head Hex Socket Drive Wood Screw. These might also be referred to as Furniture Screws.

      Searching on these descriptions, you can find sources ranging from Asian manufacturers to more local distributors, depending on the quantities you are looking for. From what I can see, if you are only looking for a handful of these screws, Home Depot might be the right source for you.

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