1, Applied specification: API Spec 7-2;
2, Material: bearing steel that is hardened to Rockwell C60-63;
3, Guaranteed quality: We have been manufacturing API gauges since 1970s. Our gauges have been field-tested by over 800 customers in 35 countries;
4, 3rd-party calibration: All our working gauges are calibrated and certified with certified API reference master gauges by a national-level 3rd-party calibration center which is accredited to ISO/IEC 17025:2005.
When ordering, please specify the following information:
1, Types & sizes of connections;
2, Master gauges or working gauges;
3, Ring or plug, or set;
4, Right hand or left hand.
FULL HOLE (FH) | |||||
---|---|---|---|---|---|
SIZE | THREAD FORM | T.P.I. | T.P.F. | PITCH DIAMETER | STANDOFF TOLERANCE |
FH 3-1/2 | V-0.040 | 5 | 1:4 | 94.844 | 15.875±0.100 |
FH 4(NC40) | V-0.065 | 4 | 1:6 | 103.429 | |
FH 4-1/2 | V-0.040 | 5 | 1:4 | 115.113 | |
FH 5-1/2 | V-0.050 | 4 | 1:6 | 142.011 | |
FH 6-5/8 | V-0.050 | 4 | 1:6 | 165.598 |