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Bolt Length Estimation Table for F3125 Grade A325 and A490 Bolts

Admin

11/1/2017

This table can be used as a guide for bolt length estimation for our structural bolts. Add the length below to grip to determine bolt length required. If beveled washers are used, add an additional 5/16 inch to the no washer column for each bevel washer. If you have any questions, please contact our sales team.

Nominal Bolt Diameter	No Washer	One Washer	Two Washers
1/2	11/16	55/64	1 3/64
5/8	7/8	1 1/32	1 3/16
3/4	1	1 5/32	1 5/16
7/8	1 1/8	1 9/32	1 7/16
1	1 1/4	1 13/32	1 9/16
1 1/8	1 1/2	1 21/32	1 13/16
1 1/4	1 5/8	1 25/32	1 15/16
1 3/8	1 3/4	1 29/32	2 1/16
1 1/2	1 7/8	2 1/32	2 3/16