1/2 - 20

G.A. CO.

1/2 20 UNF 3A SPECIAL THREAD RING GAGE .50 NO GO ONLY P.D. = .4643 1/2-20 UNF-3A

GREENFIELD

1/2 20 UNF 2A -.0013 UNDERSIZE THREAD RING GAGE .5 GO ONLY P.D. = .4649 QUALITY

HEMCO

1/2 20 UNS THREAD RING GAGE .5 GO ONLY P.D. = .4656 QUALITY 1/2-20 SHOP TOOL

CADILLAC GAGE CO.

1/2 20 NS THREAD RING GAGE .5 NO GO ONLY P.D. = .4708 QUALITY 1/2-20 INSPECTION

VERMONT

1/2 20 UNF 2A VERMONT THREAD RING GAGE .5 GO ONLY P.D. = .4662 1/2-20 QUALITY

G.A. CO.

1/2 20 NF 2 SPECIAL THREAD RING GAGES .5 GO NO GO P.D.'S = .4665 & .4639 1/2-20

G.A. CO.

1/2 20 UNF BEFORE PLATE THREAD RING GAGE .5 NO GO ONLY P.D. = .4589 B/P QUALITY

ALAMEDA

1/2 20 UNF 3A LEFT HAND THREAD RING GAGE .5 NO GO ONLY P.D. = .4643 L.H.

HEMCO

NEW CERTIFIED 1/2 20 UNF 2A THREAD RING GAGE .5 NO GO ONLY P.D. = .4619 QUALITY

PONAM

1/2 20 UNF 2A BEFORE PLATE THREAD RING GAGE .5 GO ONLY P.D. = .4646 B/P BP

G.A. CO.

1/2 20 UNJF 3A SPECIAL THREAD RING GAGE .5 GO ONLY P.D. = .4663 INSPECTION TOOLS

PONAM

1/2 20 UNF 2A BEFORE PLATE THREAD RING GAGE .5 NO GO ONLY P.D. = .4615 TOOL B/P