1/4 - 28

DOALL

1/4 28 NF 2 LEFT HAND THREAD RING GAGE .25 GO ONLY P.D. = .2268 UNF-2 3A L.H. - DW9680BU

PRATT & WHITNEY

1/4 28 UNF 3A CARBIDE THREAD RING GAGE .25 GO ONLY P.D. = .2268 NF-3A 2 3 - DW7345CG

GAGE ASSEMBLY CO.

1/4 28 UNF 2A PREPLATE THREAD RING GAGES .25 GO NO GO P.D.'S = .2228 & .2195

G.A. CO.

1/4 28 UNEF 2A PREPLATE THREAD RING GAGES .25 GO NO GO P.D.'S= .2240 & .2219 B/P