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.
NUMBERED CONNECTIONS (NC) | |||||
---|---|---|---|---|---|
SIZE | THREAD FORM | T.P.I. | T.P.F. | PITCH DIAMETER | STANDOFF TOLERANCE |
NC23 | V-0.038R | 4 | 1:6 | 59.817 | 15.875±0.100 |
NC26(IF 2-3/8) | 67.767 | ||||
NC31(IF 2-7/8) | 80.848 | ||||
NC35 | 89.687 | ||||
NC38(IF 3-1/2) | 96.723 | ||||
NC40(FH4) | 103.429 | ||||
NC44 | 112.192 | ||||
NC46(IF 4) | 117.500 | ||||
NC50(IF 4-1/2) | 128.059 | ||||
NC56 | 1:4 | 142.646 | |||
NC61 | 156.921 | ||||
NC70 | 179.146 | ||||
NC77 | 196.621 |