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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.
BUTTRESS CASING (BCSG)
SIZET.P.I.T.P.F.PITCH DIAMETERSTANDOFF TOLERANCE
4-1/2
5
1:16113.132
2.540±0.381
5
125.8325.080±0.381
5-1/2
138.532
6-5/8167.107
7176.632
7-5/8192.507
8-5/8217.907
9-5/8243.307
10-3/4271.882
11-3/4297.282
13-3/8338.557
161:12404.8254.445±0.381
18-5/8471.500
20506.425