Heavy Hex Bolt Specification Sheet

Heavy hex bolt specifications include: A193, A320 and A307B. Although A325 and A490 bolts also require heavy hex heads because these bolts have a shorter thread length than standard heavy hex bolts. Heavy-duty hex bolts are used in many different applications, including fastening wood, steel, and other construction materials for projects such as piers, bridges, highway structures, and buildings. Heavy hex bolts with forged heads are also commonly used as head anchor bolts.

Standard thread length
Bolt length ≤ 6" thread length = (2 x diameter) + 1/4"
Bolt Length > 6" Thread Length = (2 x Diameter) + 1/2"

Heavy Hex Bolt Size Chart

Bolt diameter	d	F			C		H
	Body Diameter	Flat Width			Corner Width		Height
	MAX	Basic	MAX	MIN	MAX	MIN	Basic	MAX	MIN
1 / 2	0.515	7 / 8	0.875	0.85	1.01	0.969	11 / 32	0.364	0.302
5 / 8	0.642	1 1 / 16	1.062	1.031	1.227	1.175	27 / 64	0.444	0.378
3 / 4	0.768	1 1 / 4	1.25	1.212	1.443	1.383	1 / 2	0.524	0.455
7 / 8	0.895	1 7 / 16	1.438	1.394	1.66	1.589	37 / 64	0.604	0.531
1	1.022	1 5 / 8	1.625	1.575	1.876	1.796	43 / 64	0.7	0.591
1 1 / 8	1.149	1 13 / 16	1.812	1.756	2.093	2.002	3 / 4	0.78	0.658
1 1 / 4	1.277	2	2	1.938	2.309	2.209	27 / 32	0.876	0.749
1 3 / 8	1.404	2 3 / 16	2.188	2.119	2.526	2.416	29日 / 32	0.94	0.81
1 1 / 2	1.531	2 3 / 8	2.375	2.3	2.742	2.622	1	1.036	0.902
1 5 / 8	1.658	2 9 / 16	2.562	2.481	2.959	2.829	1 3 / 32	1.116	0.978
1 3 / 4	1.785	2 3 / 4	2.75	2.662	3.175	3.035	1 5 / 32	1.196	1.054
1 7 / 8	1.912	2 15 / 16	2.938	2.844	3.392	3.242	1 1 / 4	1.276	1.13
2	2.039	3 1 / 8	3.125	3.025	3.608	3.449	1 11 / 32	1.388	1.175
2 1 / 4	2.305	3 1 / 2	3.5	3.388	4.041	3.862	1 1 / 2	1.548	1.327
2 1 / 2	2.559	3 7 / 8	3.875	3.75	4.474	4.275	1 21 / 32	1.708	1.479

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