Used for checking API internal & external thread. Conform to: API 5B. CSG,LCSG,LP,BCSG,TBG,UPTBG
API Thread Gauges:
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"
Parameters:
| Gauge code | Outer Dia | Pitch/ | Taper | Form angle |
| per25.4mm | ||||
| 4 1/2 (CSG,LCSG,BCSG) | 114.3 | 3.175(8) | 1:16 | 60° |
| 5 (CSG,LCSG,BCSG) | 127 | 3.175(8) | ||
| 5 1/2 (CSG,LCSG,BCSG) | 139.7 | 3.175(8) | ||
| 6 5/8 (CSG,LCSG,BCSG) | 168.28 | 3.175(8) | ||
| 7 (CSG,LCSG,BCSG) | 177.8 | 3.175(8) | ||
| 7 5/8 (CSG,LCSG,BCSG) | 193.68 | 3.175(8) | ||
| 8 5/8 (CSG,LCSG,BCSG) | 219.08 | 3.175(8) | ||
| 9 5/8 (CSG,LCSG,BCSG) | 244.48 | 3.175(8) | ||
| 10 3/4 (CSG,LCSG,BCSG) | 273.05 | 3.175(8) | ||
| 11 3/4 (CSG,LCSG,BCSG) | 298.45 | 3.175(8) | ||
| 13 3/8 (CSG,LCSG,BCSG) | 339.73 | 3.175(8) | ||
| 16 (CSG,LCSG,BCSG) | 406.4 | 3.175(8) | ||
| 18 5/8 (CSG,LCSG,BCSG) | 473.08 | 3.175(8) | ||
| 20 (CSG,LCSG,BCSG) | 508 | 3.175(8) |
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