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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.
INTERNAL FLUSH (IF)
SIZETHREAD FORMT.P.I.T.P.F.PITCH DIAMETERSTANDOFF TOLERANCE
IF 2-3/8(NC26)V-0.06541:667.76715.875±0.100
IF 2-7/8(NC31)80.848
IF 3-1/2(NC38)96.723
IF 4(NC46)117.500
IF 4-1/2(NC50)128.059
IF 5-1/2157.201