Bolt Length Estimation Table for F3125 Grade A325 and A490 Bolts

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

The Power of Finding the Right Partner

Explore the eight key benefits of having a single reliable fastener supplier.

Focus on What
Matters Most

Anchor down your fastener supply with help from industry experts.

Related Posts

ASTM F3125: What Kind of Structural Bolts Does it Cover?
04/2/2018
What is ASTM F3125? In 2015, the ASTM consolidated the standards for structural bolts into F3125....
Anchor Bolts: Types and Uses
11/19/2018
Anchor bolts are designed to attach structural elements to concrete. In our industry, anchor...
Structural Bolt Coatings
02/23/2018
Coating structural bolting assemblies can protect the steel and ensure durability of the bolt, nut,...