ASTM A325 ASTM A490

ASME B 18.2.6 - 2006

Heavy Hex Structural Bolts

ASTM A 325 / ASTM A 490

Screw Thread
d

d_s	max
d_s	min
s	Nominal Size
	max
	min
e	max
e	min
k	Nominal Size
	max
	min
b	Ref.

0.515	0.642	0.768	0.895	1.022	1.149	1.277	1.404	1.531
0.482	0.605	0.729	0.852	0.976	1.098	1.223	1.345	1.47
7/8	1-1/16	1-1/4	1-7/16	1-5/8	1-13/16	2	2-3/16	2-3/8
0.875	1.062	1.25	1.438	1.625	1.812	2	2.188	2.375
0.85	1.031	1.212	1.394	1.575	1.756	1.938	2.119	2.3
1.01	1.227	1.443	1.66	1.876	2.093	2.309	2.526	2.742
0.969	1.175	1.383	1.589	1.796	2.002	2.209	2.416	2.622
5/16	25/64	15/32	35/64	39/64	11/16	25/32	27/32	15/16
0.323	0.403	0.483	0.563	0.627	0.718	0.813	0.878	0.974
0.302	0.378	0.455	0.531	0.591	0.658	0.749	0.81	0.902
1	1.25	1.38	1.5	1.75	2	2	2.25	2.25

①,Chemical and mechanical properties of steel bolts shall conform to ASTM A 325 or ASTM A 490.

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