3 1/4 - 16

BATH

3 1/4 16 N 3 THREAD RING GAGES 3.25 GO NO GO P.D.'S = 3.2094 & 3.2046 3.250 - DW12222RD

ALAMEDA

3 1/4 16 UNS 3A PREPLATE THREAD RING GAGE 3.25 NO GO ONLY P.D. = 3.2048 NS-3A - DW7623BU