1/2 - 20

S.G. CO.

1/2 20 UNF MODIFIED THREAD RING GAGE .5 NO GO ONLY P.D. = .4565 .50 .500 .5000 - DW12097RD

1/2 20 NF NON STANDARD THREAD RING GAGE .5 NO GO ONLY P.D. = .4615 UNF .50 .500 - DW12099RD

SHEFFIELD

1/2 20 NF BEFORE PLATE THREAD RING GAGE .5 NO GO ONLY P.D. = .4585 UNF .50 .500 - DW12098RD

PD

1/2 20 UNJF 3A BEFORE PLATE THREAD RING GAGE .5 NO GO ONLY P.D. = .4637 .50 .500 - DW9668BU

S.G. CO.

1/2 20 UNF 2A BEFORE PLATE THREAD RING GAGES .5 GO NO GO P.D.'S = .4652 & .4609 - DW8752RD

1/2 20 UNF 2A SPECIAL THREAD RING GAGES .5 GO NO GO P.D.'S= .4675 & .4639 .50-20

BUDGET 1/2 20 SOLID THREAD RING GAGE .5 1/2-20 QUALITY INSPECTION CHECK .500

ALAMEDA

1/2 20 NS SPECIAL PITCH DIA THREAD RING GAGE .5 GO ONLY P.D. = .4652 SPL. .500

ATLAS

1/2 20 UNS 3A MODIFIED THREAD RING GAGE .5 NO GO ONLY P.D. = .4643 NS-3A .50

G.A. CO.

1/2 20 UNF SPECIAL THREAD RING GAGES .5 GO NO GO P.D.'S = .4710 & .4685 1/2-20

G.A. CO.

1/2 20 UNF 3A EXTRA THICK THREAD RING GAGE .5 GO ONLY P.D. = .4675 DEEPWELL

1/2 20 NF 4 THREAD RING GAGE .5 GO ONLY P.D. = .4678 QUALITY INSPECTION .50-20