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Countersunk Bolts

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Categories: Headed Bolts Countersunk Bolts
Description

  •  

    Countersunk bolts are used when a smooth surface is required. Common applications include bridge decking, walkways, and railing.

    Manufacturing

    Portland Bolt manufactures countersunk bolts from 1/2″ diameter through 1-1/2″ diameter in most ASTM, AASHTO, and SAE specifications, including A307 Grade A, A449, and F3125 Grade A325. Countersunk bolts have a head angle of approximately 80 degrees. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company’s name and/or logo.

    Slots in Countersunk Bolts

    Countersunk heads can include a machined slot, forged slot, or no slot whatsoever. A slot allows the head to be held securely with a flathead screwdriver while the nut is assembled onto the bolt. Forged slots measure 1/8″ wide x 1/8″ deep x 5/8″ long. Machined slot dimensions are listed in the table below.

    • Cutting
     
    • Heading
     
    • Threading
     
    • Hot-Dip Galvanizing

    Standard Thread Length

    Bolt lengths ≤ 6″: Thread length = (2 X diameter) + 1/4″
    Bolt lengths > 6″: Thread length = (2 X diameter) + 1/2″
    Note: Most stock hex bolts longer than 12″ in length will have 6″ of thread.

    Countersunk Dimensions

    Click table to show drawing
    Bolt Diameter D F H J S
    Body Diameter Head Diameter Head Height Slot Width Slot Depth
    Max Max Edge Sharp Min Edge Sharp Absolute Min Rounded Max Min Max Min Max Min
    1⁄2 0.515 0.935 0.905 0.845 0.269 0.233 0.106 0.091 0.103 0.068
    5⁄8 0.642 1.169 1.132 1.066 0.336 0.292 0.113 0.116 0.137 0.091
    3⁄4 0.768 1.402 1.357 1.285 0.403 0.349 0.149 0.131 0.171 0.115
    7⁄8 0.895 1.637 1.584 1.511 0.470 0.408 0.167 0.147 0.206 0.138
    1 1.022 1.869 1.810 1.735 0.537 0.466 0.188 0.166 0.240 0.162
    11⁄8 1.149 2.104 2.037 1.962 0.604 0.525 0.196 0.178 0.257 0.173
    11⁄4 1.277 2.337 2.262 2.187 0.671 0.582 0.211 0.193 0.291 0.197
    13⁄8 1.404 2.571 2.489 2.414 0.738 0.641 0.226 0.208 0.326 0.220
    11⁄2 1.531 2.804 2.715 2.640 0.805 0.698 0.258 0.240 0.360 0.244

    Dimensions per ASME B18.5 1990 (R 1998)

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