Q 220-1999
Type H cross recessed pan head tapping screws and plain washer assemblies-type A-type C
Q 221-1999
Type H cross recessed pan head tapping screw and large plain washer assemblies-type A-type C
Q 220B-2012
Type H cross recessed pan head tapping screws and plain washer assemblies-type A-type C
Q 221B-2012
Type H cross recessed pan head tapping screws and large plain washer assemblies-type A-type C