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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.

All dimensions in millimeters, except as indicated.
FULL HOLE (FH)
SIZETHREAD FORMT.P.I.T.P.F.PITCH DIAMETERSTANDOFF TOLERANCE
FH 3-1/2V-0.04051:494.84415.875±0.100
FH 4(NC40)V-0.06541:6103.429
FH 4-1/2V-0.04051:4115.113
FH 5-1/2V-0.05041:6142.011
FH 6-5/8V-0.05041:6165.598