US Std. Thread Length Bolts

Standard Thread Length (in.)*

Bolt DiameterBolts 6 inches and ShorterBolts longer than 6 inches
1/4″3/4″1″
5/16″7/8″1-1/8″
3/8″1″1-1/4″
7/16″1-1/8″1-3/8″
1/2″1-1/4″1-1/2″
5/8″1-1/2″1-3/4″
3/4″1-3/4″2″
7/8″2″2-1/4″
1″2-1/4″2-/12″
* Important Note: Some Bolts may vary from the standard thread length.