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Welcome to the Fastener Resource Center. Our Experts have built this site as a central resource by and for the industrial fastener industry and the related supply chains.

Here you’ll find expert advice, technical specifications for industrial fasteners and our “Ask The Experts ” page, where we answer questions and even recount problems we’ve solved for our partners.

The information contained on these pages has been gathered from numerous sources from the Internet and other industry sources and is provided to you free of charge for reference purposes only. For specific advice, please consult a certified engineer.

Feel free to ask a question, leave a comment and interact!

Regards,

The Fastener Resource Center Team

31 Responses to Home

  1. Frank says:

    Can you tell me if the Robertson square drive recess is tapered like the Drive Bits?
    I can find no information regarding this, just a width specification.

    Regards

    • Expert says:

      The Robertson square socket recess in the screw head is tapered, as is the head of the Robertson square drive screwdriver / drill bit. This combination creates a wedge, making the screw head and driver head become a perfect fit.

  2. Aaron says:

    please provide me with the technical specifications of a DIN 6796 M12 Conical spring washers in A4 Stainless Steel.

    • Expert says:

      DIN 6796 Conical Spring Washers for bolted connections A4 Stainless Steel – Dimensional Specifications

      The dimensions for DIN 6796 Conical Spring Washers are as follows:

      DIN 6796 Conical Spring Washers - Dimensional Specifications

      *All measurements in millimeters (mm)*

      d1 used for s h d2
      2.7 M2.5 0.5 - 6
      3.2 M3 0.6 0.85 7
      3.7 M3.5 0.8 1.06 8
      4.3 M4 1 1.3 9
      5.3 M5 1.2 1.55 11
      6.4 M6 1.5 2 14
      7.4 M7 1.75 2.3 17
      8.4 M8 2 2.6 18
      10.5 M10 2.5 3.2 23
      13 M12 3 3.95 29
      15 M14 3.5 4.65 35
      17 M16 4 5.25 39
      19 M18 4.5 5.8 42
      21 M20 5 6.4 45

      All information is strictly informative

  3. Penny says:

    what are the outside dimensions, the square size and thickness of a 3/8-16 regular steel square nuts hot dip galvanized ?”

    • aspeninfo says:

      Hot Dip Galvanized Square Nuts – Dimensional Specifications

      The dimensions for hot dip galvanized square nuts are as follows:

      hot dip galvanized square nuts - Dimensional Specifications

      *All measurements in inches*

      Hot Dip Galvanized Regular Square Nuts

      Nominal / 
      Basic Major 
      Dia. of Thread
      F G H
      Width
      Across Flats
      Width
      Across Corners
      Height
      Basic Max Min Max Min Basic Max Min
      1/4 0.2500 7/16 0.438 0.425 0.619 0.554 7/32 0.235 0.203
      5/16 0.3125 9/16 0.562 0.547 0.795 0.721 17/64 0.283 0.249
      3/8 0.3750 5/8 0.625 0.606 0.884 0.802 21/64 0.346 0.310
      7/16 0.4375 3/4 0.750 0.728 1.061 0.970 3/8 0.394 0.356
      1/2 0.5000 13/16 0.812 0.788 1.149 1.052 7/16 0.458 0.418
      5/8 0.6250 1" 1.000 0.969 1.414 1.300 35/64 0.569 0.525
      3/4 0.7500 1-1/8 1.125 1.088 1.591 1.464 21/32 0.680 0.632
      7/8 0.8750 1-5/16 1.312 1.269 1.856 1.712 49/64 0.792 0.740
      1" 1.0000 1-1/2 1.500 1.450 2.121 1.961 7/8 0.903 0.847
      1-1/4 1.2500 1-7/8 1.875 1.812 2.652 2.458 1-3/32 1.126 1.062
      1-1/2 1.5000 2-1/4 2.250 2.175 3.182 2.956 1-5/16 1.348 1.000

      All information is strictly informative

  4. Allen says:

    Do you know the thread length of a A2 Stainless Steel DIN 580 M8 Lifting Eye Bolt ?

    thx

    • aspeninfo says:

      The dimensions for DIN 580 Lifting Eye Bolts are as follows:

      DIN 580 Lifting Eye Bolt – Dimensional Specifications

      DIN 580 lifting eye bolt - Dimensional Specifications

      *All measurements in mm*

      DIN 580 Specifications

      All measurements in millimeters (mm)

      d k L d2 d3 d4 h
      M6 27.5 12 27 19 14 6.5
      M8 36 13 36 20 20 8
      M10 45 17 45 25 25 10
      M12 53 20.5 54 30 30 12
      M14 62 27 63 35 35 14
      M16 62 27 63 35 35 14
      M20 71 30 72 40 40 16
      M22 90 36 90 50 50 20
      M24 90 36 90 50 50 20
      M27 109 45 108 65 60 24
      M30 109 45 108 65 60 24
      M33 128 54 126 75 70 28
      M36 128 54 126 75 70 28
      M42 147 63 144 85 80 32
      M45 168 68 166 100 90 38
      M48 168 68 166 100 90 38
      M52 187 78 184 110 100 42
      M56 187 78 184 110 100 42
      M64 208 90 206 120 110 48
      M72 260 100 260 150 140 60
      M80 298 112 296 170 160 68
      M100 330 130 330 190 180 75

      All information is strictly informative

  5. Jerome says:

    What are the dimensions of a M10 DIN 436 square washer in A4 stainless steel

    • aspeninfo says:

      DIN 436 A4 Stainless Steel Square Washers – Dimensional Specifications

      DIN 436 A4 Stainless Steel Square Washers - Dimensional Specifications

      *All measurements in mm*

      The dimensions for DIN 436 A4 Stainless Steel Square Washers are as follows:

      DIN 436 Specifications

      All measurements in millimeters (mm)

      d1 screw dia A h
      11 M10 30 3
      13.5 M12 40 4
      17.5 M16 50 5
      22 M20 60 5
      24 M22 70 6
      26 M24 80 6
      30 M27 90 6
      33 M30 95 6
      36 M35 100 6
      39 M38 110 8
      42 M41 125 8
      45 M44 135 8
      48 M47 140 8
      52 M51 150 10
      56 M55 160 10

      All information is strictly informative

  6. Francis says:

    what are the dimensions of a 5/8-11 X 2 brass hex head cap screw?

    • Expert says:

      Hex Head cap Screws – Dimensional Specifications

      Hex Head Cap Screws - dimensional Specifications

      *All measurements in inches (in)*

      For this specific hex head cap screw size the dimensions are as follows:

      L = 2”
      E = 5/8” (0.6170” to 0.6250”)
      F = 15/16” (0.922” to 0.938”)
      G = 1.051” to 1.083”
      H = 25/64” (0.378” to 0.403”)
      LT = 1-1/2”

      For all other sizes please refer to the following link: Hex head cap screw dimensional specifications

  7. Expert says:

    What is the max thickness of the head of a 10-32 X 3/8 regular thumb screw (No Shoulder)?

    • Expert says:

      Thumb Screws, Plain Pattern (no shoulder) Type B Dimensional Specifications

      Thumb Screws, Plain Pattern (no shoulder) Type B - dimensional Specifications *All measurements in inches*

      Nominal
      Size or Basic Screw Diameter
      Threads Per Inch A B C C1 L
      Head Width Head Height Head Thickness Head Thickness (Mid-section) Practical Screw Lengths
      Ref Ref Ref Ref Max Min
      #6 0.138 32 0.41 0.29 0.08 0.03 1.00 0.25
      #8 0.164 32 0.44 0.30 0.10 0.05 1.00 0.38
      #10 0.190 24 0.55 0.43 0.12 0.06 2.00 0.38
      #12 0.216 24 0.47 0.53 0.13 0.06 2.00 0.38
      1/4” 0.250 20 0.65 0.55 0.16 0.07 2.50 0.50
      5/16” 0.312 18 0.87 0.67 0.19 0.09 3.00 0.50
      3/8” 0.375 16 1.02 0.75 0.24 0.11 3.00 0.75
      1/2” 0.500 13 1.75 1.22 0.39 0.13 3.00 1.00
  8. Ray says:

    What are the dimensions of a DIN 934 M30X1.5 regular hex nut Class 10 steel ? Width across the flats and the thickness. Thanks”

    • Expert says:

      DIN 934 (ISO 4032)- Hexagon Nuts – 0.8d Dimensional Specifications

      DIN 934 - Hexagon Nuts - dimensional Specifications

      *All measurements in millimeters (mm)*

      d s e m
      M1 2.5 2.72 0.8
      M1.2 3 3.29 1
      M1.4 3 3.29 1.2
      M1.6 3.2 3.48 1.3
      M1.7 3.5 3.82 1.4
      M2 4 4.32 1.6
      M2.3 4.5 4.95 1.8
      M2.5 5 5.45 2
      M2.6 5 5.51 2
      M3 5.5 6.01 2.4
      M3.5 6 6.01 2.8
      M4 7 7.66 3.2
      M5 8 8.76 4
      M6 10 11.05 5
      M7 11 12.12 5.5
      M8 13 14.38 6.5
      M10 17 18.9 8
      M12 19 21.1 10
      M14 22 24.49 11
      M16 24 26.75 13
      M18 27 29.56 15
      M20 30 32.95 16
      M22 32 35.03 18
      M24 36 39.55 19
      M27 41 45.2 22
      M30 46 50.85 24
      M33 50 55.37 26
      M36 55 60.79 29
      M39 60 66.44 31
      M42 65 71.3 34
      M45 70 76.95 36
      M48 75 82.6 38
      M52 80 88.25 42
      M56 85 95.07 45
      M60 90 100.72 48
      M64 95 106.37 51
      M68 100 112.02 54
      M72 105 117.67 58
      M76 110 123.32 61
      M80 115 128.97 64
      M85 120 133.11 68
      M90 130 145.77 72
      M95 135 151.42 76
      M100 145 162.72 80
      M105 150 16837 84
      M110 155 174.02 88
      M115 165 185.32 92
      M120 170 190.97 96
      M125 180 202.27 100
      M130 185 207.75 104
      M135 190 213.40 108
      M140 200 224.70 112
      M145 210 236 116
      M150 210 236 120

      *All information is strictly informative

  9. Doug says:

    Can dacrotized coated deck screws be used with red cedar?

    • Expert says:

      Thank you for your question. We do not recommend dacrotized screws for cedar as we have had feedback indicating that some staining/streaking may occur. We do offer options that might be of interest to you:

      • Stainless steel deck screws that are highly resistant to corrosion and to our knowledge will not stain or streak cedar or pressure treated lumber
      • Buy Stainless Steel Deck Screws

      • Red ceramic coated deck screws that are highly corrosion resistant that will not streak or stain lumber and because of the color of the coating of these screws, it should blend quite nicely with red cedar planks.
      • Buy Ceramic coated deck screws

  10. David says:

    What size bit is used to drive a stainless steel M4-0.7 X 10mm button head torx with pin security machine screw ?

    • Expert says:

      The driver size for a M4 button head torx with pin security drive screw is a T15 Torx Security (Pin) bit.

  11. Bill says:

    What are the dimensions of a DIN 934 M30X1.5 Regular Hex Nut Class 10 Steel (Width across the flats and the thickness)? Thanks”

  12. Don says:

    what is the difference between USS and SAE flat washers?

    • Expert says:

      SAE flat washers have a slightly smaller inside diameter and outside diameter than USS flat washers. In addition SAE flat washers are typically slightly thinner than USS flat washers. See the chart below for dimensional specs for both washer types:

      SIZE
      INSIDE
      DIAMETER
      OUTSIDE
      DIAMETER
      THICKNESS
       
       
      SAE FLAT WASHERS
      #6 5/32″ 3/8″ 3/64″
      #8 3/16″ 7/16″ 3/64″
      #10 7/32″ 1/2″ 3/64″
      1/4″ 9/32″ 5/8″ 1/16″
      5/16″ 11/32″ 11/16″ 1/16″
      3/8″ 13/32″ 13/16″ 1/16″
      7/16″ 15/32″ 59/64″ 1/16″
      1/2″ 17/32″ 1-1/16″ 3/32″
      9/16″ 19/32″ 1-3/16″ 3/32″
      5/8″ 21/32″ 1-5/16″ 3/32″
      3/4″ 13/16″ 1-1/2″ 9/64″
      7/8″ 15/16″ 1-3/4″ 9/64″
      1″ 1-1/16″ 2″ 9/64″
      1-1/8″ 1-3/16″ 2-1/4″ 9/64″
      1-1/4″ 1-5/16″ 2-1/2″ 5/32″
      1-1/2″ 1-7/16″ 3″ 3/16″
       
      USS FLAT WASHERS
      3/16″ 1/4″ 9/16″ 3/64″
      1/4″ 5/16″ 3/4″ 1/16″
      5/16″ 3/8″ 7/8″ 5/64″
      3/8″ 7/16″ 1″ 5/64″
      7/16″ 1/2″ 1-1/4″ 5/64″
      1/2″ 9/16″ 1-3/8″ 7/64″
      9/16″ 5/8″ 1-1/2″ 7/64″
      5/8″ 11/16″ 1-3/4″ 9/64″
      3/4″ 13/16″ 2″ 5/32″
      7/8″ 15/16″ 2-1/4″ 11/64″
      1″ 1-1/16″ 2-1/2″ 11/64″
      1-1/8″ 1-1/4″ 2-3/4″ 11/64″
      1-1/4″ 1-3/8″ 3″ 11/64″
      1-3/8″ 1-1/2″ 3-1/4″ 3/16″
      1-1/2″ 1-5/8″ 3-1/2″ 3/16″
      1-5/8″ 1-3/4″ 3-3/4″ 3/16″
      1-3/4″ 1-7/8″ 4″ 3/16″
      1-7/8″ 2″ 4-1/4″ 3/16″
      2″ 2-1/8″ 4-1/2″ 3/16″
      2-1/2″ 2-5/8″ 5″ 15/64″
      3″ 3-1/8″ 5-1/2″ 9/32″
  13. Ron says:

    What is the thread length (machine screw and wood screw threading) of a metric DIN 88149 M8X80 Hanger Bolt?

    • Expert says:

      DIN 88149

      Dimensional Specifications of Metric DIN 88149Hanger Screws / Hanger bolts:

      DIN 88149
      Size D L P P1 D1 A B S
      M8×80 M8 80 1.25 3.0-3.2 6.85-7.0 20.00 30.00 5.75-6.00
      M8×90 M8 90 1.25 3.0-3.2 6.85-7.0 20.00 40.00 5.75-6.00
      M8×100 M8 100 1.25 3.0-3.2 6.85-7.0 20.00 45.00 5.75-6.00
      M8×120 M8 120 1.25 3.0-3.2 6.85-7.0 20.00 45.00 5.75-6.00
      M10×100 M10 100 1.50 3.0-3.2 8.85-9.00 40.00 45.00 7.75-8.00
      M10×120 M10 120 1.50 3.0-3.2 8.85-9.00 40.00 60.00 7.75-8.00
      M10×140 M10 140 1.50 3.0-3.2 8.85-9.00 40.00 60.00 7.75-8.00

       

      * All sizes in mm;

  14. Franco B says:

    I have a custom bolt specification that calls for a 310 grade stainless steel. All of my usual sources are “no quoting”. Any idea why?

    • Expert says:

      I suspect that you are reaching out to manufacturers that are (cold?) headers as opposed to makers that would mill the parts. Grade 310 Stainless Steel is much better suited to machining as opposed to cold heading. There are other characteristic of a Grade 310 Stainless Steel that might make it difficult to replace with a more standard 304 (18-8) Stainless Steel – for instance if your application requires high temperature service. If you can be more specific as to what your bolting application is, perhaps we can offer suggestions for suitable stainless steel grades that would be better suited to cold heading.

  15. Svenstrom says:

    What would be the force needed to shear a 5/16-18 diameter 18-8 stainless steel bolt?

  16. Justin Burns says:

    Hello I’m in the Mechanical Engineering program at Forsyth Technical CC. I have a multi-screw head and square thread presentation and was trying to find any and all information on the following:

    1) Clutch type A screw head
    2) Multi-spline or Bristol screw head
    3) Slab Head screw/bolt head
    4) Phillips screw head
    5) Square threads

    Mainly I’m looking for pictures/history/ process of manufacturing/ purpose of each/ etc.

    Any help would be greatly appreciated.

    Sincerely,
    Justin Burns

    • Expert says:

      Hello Justin,

      It would appear to me that what you are looking for is information on fastener drive systems. Whereas we here at Fastener Experts are good at solving particular challenges that fastener users have (i.e. what platings to use in specific environments; what fasteners to consider for a particular assembly requirement), your question is best answered by existing resources already on the Internet.

      Let me help you get started:

      A great overview of fasteners in general can be found at this Wikipedia page: http://en.wikipedia.org/wiki/Screw.

      An excellent list of fastener drive types can be found at this Wikipedia page: http://en.wikipedia.org/wiki/List_of_screw_drives. On this page, I am seeing the drives you are looking into: Clutch, multi-Spline/Bristol, Phillips and Square. The only one missing seems to be the “Slab Head” and to be honest, I haven’t yet come across this one in 30 years in this field. However, this page seems to have an entry for a Slab Head and wouldn’t you know it, it looks just like it sounds: http://allied1.com/harper.htm.

      Basically, between Google and Wikipedia, you’ll be able to find everything you need. If you need illustrations, you can find those on the Aspen Fasteners site.

      Good luck with your studies over at Forsyth Technical (in North Carolina, right? Yeah, I googled your school!) and let us know if there is anything else that we can help you with.

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