API Thread Gage Calibration Services

API Specification 7 working gage calibration refers to measuring the mating standoff against a certified reference master plug and ring gage. Each API reference master gage shall be accompanied by a certification from an API qualified agency such as the National Institute of Standards and Technology (NIST) located in Gaithersburg, Maryland, USA, the National Physical Laboratory (NPL) located in the United Kingdom, or the National Institute of Metrology (NIM) located in Beijing, China, as described in the API specifications.

For API Specification 5B working gage calibration the API approved certifying agency shall perform, the same mating standoff as above, and provide a report detailing the results of the inspection. SDM Calibrations has the masters for the size gages listed below. All others we can outsource to one of our approved vendors

API THREAD GAGES (7-2, 5-B)

XHOLE

3 ½”
4 ½”
5”

AOH

2 7/8”

SLIMLINE H-90

2 3/8”
2 7/8”
3 1/2”

HEF

2 3/8″
2 7/8″

PAC

2 3/8″
2 7/8″

REG

2 3/8″
2 7/8″
3 1/2″
4 1/2″
5 1/2″
6 5/8″
7 5/8″

IF

2 3/8”
2 7/8”
3 ½”
4”
4 ½”
5 ½”

FH

3 ½”
4”
4 ½”
5 ½”
6 5/8”

H-90

4”
4 ½”
5”
5 ½”
6 5/8”
7 5/8”

NC

NC-26
NC-31
NC-35
NC-38
NC-40
NC-44
NC-46
NC-50
NC-56

(EU) UPSET TUBING

1.900”
2 3/8”
2 7/8”
3 ½”
4 ½”

(NU) NON UPSET TUBING

1.900”
2 3/8”
2 7/8”
3 ½”
4 ½”

8 ROUND CASING

5”
5 ½”
7”
7 5/8”
9 5/8”