API thread Gauges:
Used for gaging API internal or external thread.
Conform to: API 5B.
CSG,LCSG,LP,BCSG,TBG,UPTBG,NC..
API Thread Gauges: Used for gaging 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...