API Thread Gauge, Ring Gauge, Plug Gauge

API thread Gauges usage:

1.Used for checking API internal & external thread.

Conform to: API 5B
and 7. CSG,LCSG,LP,BCSG,TBG,UPTBG

2. Used for checking API internal and external threads.

Spec 5B:
CSG 4-1/2 to 20″
LCSG 4-1/2 to 20″
LP 1/8 to 12″
BCSG 4-1/2 to 6″
TBG1.050 to 4-1/2″
UPTBG 1.050 to 4-1/2″

3.Spec 7-2

NC10 to NC77
REG 2-3/8 to 8-5/8″
FH 3-1/2 to 6-5/8″
IF 2-3/8 to 5-1/2″