Countersunk Bolts Specification | Countersunk Bolts - Countersunk Bolts Techinical Information | Countersunk Bolts Dimensions
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Countersunk Bolts

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

Manufacturing

Ramesh Steel Corporation manufactures countersunk bolts from 1/2" diameter through 1-1/2" diameter in most ASTM, and SAE specifications including, A307 Grade A, A449, and Grade 8. Countersunk bolts have a head angle of approximately 80 degrees. Bolts are available with and without a slot in the head. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company's name and/or logo.

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.

Bolt Diameter D F H
Body Diameter Head Diameter Head Height
Max Max Edge Sharp Min Edge Sharp Absolute Min Rounded Max Min
1/2 0.515 0.935 0.905 0.845 0.269 0.233
5/8 0.642 1.169 1.132 1.066 0.336 0.292
3/4 0.768 1.402 1.357 1.285 0.403 0.349
7/8 0.895 1.637 1.584 1.511 0.470 0.408
1 1.022 1.869 1.810 1.735 0.537 0.466
1-1/8 1.149 2.104 2.037 1.962 0.604 0.525
1-1/4 1.277 2.337 2.262 2.187 0.671 0.582
1-3/8 1.404 2.571 2.489 2.414 0.738 0.641
1-1/2 1.531 2.804 2.715 2.640 0.805 0.698

Dimensions per ASME B18.5 1990 (R 1998)

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