1 1/4 - 20

SCC

1 1/4 20 UN 2A LEFT HAND THREAD RING GAGES 1.25 GO NO GO P.D.'S= 1.2161 & 1.2114

THREADS INC.

1 1/4 20 UN 3A LEFT HAND THREAD RING GAGES 1.25 GO NO GO PD'S = 1.2175 & 1.2140