A325 & B7 Bolts normally require specific Nuts & Washers in their use.  The sheet below has descriptions and color coded bars to indicate which Nuts, Washers, & Bolts are normally matched together.

A194-2H Nuts, which are specific to B7 Product, can also be used with A325-1 Structural Product as replacement for A563-C and A563-DH Nuts. However A563-C and A563-DH should not be used as replacement of A194-2H nuts as they do not meet testing requirements of A194-2H nuts. 

2025-10