1/4 - 28

G.A.CO.

1/4 28 UNF 2A PREPLATE THREAD RING GAGE .25 GO ONLY P.D. = .2238 QUALITY B/P

1/4 28 NF 3 THREAD RING GAGE .25 GO ONLY P.D. = .2268 1/4-28 .250 QUALITY TOOLS

1/4 28 NF 3 LEFT HAND THREAD RING GAGE .25 NO GO ONLY P.D. = .2246 L.H. QUALITY

G.A. CO.

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

THE PIPE MACHINERY COMPANY

1/4 28 UNF 1A THREAD RING GAGE .25 NO GO ONLY P.D. = .2208 TOOL 1/4-28 UNF-1A