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1, Applied specification: API Spec 5B;

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.
CASING SHORT-THREAD (CSG)
SIZET.P.I.T.P.F.PITCH DIAMETERSTANDOFF TOLERANCE
4-1/2
8
1:16111.846
9.525±0.635
5
124.546
5-1/2
137.246
6-5/8165.821
7175.346
7-5/8191.114
8-5/8216.514
9-5/8241.914
10-3/4270.489
11-3/4295.889
13-3/8337.164
16403.839
18-5/8470.514
20505.439