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Hex Bolts SpecificationHex Bolts SpecificationHex Bolts SpecificationHex Bolts Specification

Hex Bolts Specification

Hex bolts (six sided heads) are the industry standard for fasteners with forged heads. ASTM A307 grade A bolts, all SAE hex bolts, and several other common specifications require a standard (finished) hex head. For specifications such as A307 grade B, A325 and A490 that require a heavy hex pattern, refer to dimensional tolerances for heavy hex bolts or structural bolts.

Hex bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks, bridges, highway structures, and buildings. Hex bolts with forged heads are also commonly used as headed anchor bolts.

Manufacturing

Ramesh Steel Bolt manufactures hex bolts from 1/2" diameter through 2-1/2" diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company's name and/or logo.

Stock

Diameters: 1/2 - 1"
Grade: ASTM A307
Lengths: 30" maximum
Origin: Domestic and import
Finish: Black and hot dip galvanized

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 10" and longer will have 6" of thread.

Hex Bolts Dimensions

Bolt Diameter D F C H
Body Diameter Width Across Flats Width Across Corners Height
Max Basic Max Min Max Min Basic Max Min
3/8 0.388 9/16 0.562 0.544 0.650 0.620 1/4 0.268 0.226
1/2 0.515 3/4 0.750 0.725 0.866 0.826 11/32 0.364 0.302
5/8 0.642 15/16 0.938 0.906 1.083 1.033 27/64 0.444 0.378
3/4 0.768 1-1/8 1.125 1.088 1.299 1.240 1/2 0.524 0.455
7/8 0.895 1-5/16 1.312 1.269 1.516 1.447 37/64 0.604 0.531
1 1.022 1-1/2 1.500 1.450 1.732 1.653 43/64 0.700 0.591
1-1/8 1.149 1-11/16 1.688 1.631 1.949 1.859 3/4 0.780 0.658
1-1/4 1.277 1-7/8 1.875 1.812 2.165 2.066 27/32 0.876 0.749
1-3/8 1.404 2-1/16 2.062 1.994 2.382 2.273 29/32 0.940 0.810
1-1/2 1.531 2-1/4 2.250 2.175 2.598 2.480 1 1.036 0.902
1-3/4 1.785 2-5/8 2.625 2.538 3.031 2.893 1-5/32 1.196 1.054
2 2.039 3 3.000 2.900 3.464 3.306 1-11/32 1.388 1.175
2-1/4 2.305 3-3/8 3.375 3.262 3.897 3.719 1-1/2 1.548 1.327
2-1/2 2.559 3-3/4 3.750 3.625 4.330 4.133 1-21/32 1.708 1.479

Dimensions per ASME B18.2.1 1996

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