API various types REG/FH/IF working thread gages

Rotary shouldered thread connection is used, such as drill collars, drill pipe, the drill stabilizer and adapter
And other drilling tools and drill stem elements connected. Production and inspection in accordance with the standards API
SPEC 7-2 "rotary shouldered threaded connections. The main form of rotary shouldered thread connection
Within the flat type (IF), consistently eye (FH), digital type (NC), the normal form (REG). Of 22
Preferred connection of the kind of right-handed or left-handed.

Rotary shouldered thread for drilling tools and drill string components connected such as drill pipe, drill and adapter

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"

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"