Present position: Home >> Measuring Tools >> API Gauges

API Gauge

Sharpfine offers American Petroleum Institute - API thread gauges.

We are able to provide special conical pipe thread gauges for the petroleum

industry,designed, manufactured and inspected according to the structural

dimensions of the parts.

API gauge API gauges API gauge conform:

API spec 5B

API Spec 7-2
API gauge
    API GAUGE--BCSG Butress Thread gauge
       API gauge
    API gauge with special BECO thread profiles.
    This kind of API GAUGE is a coarse thread mainly used in drill pipes for blasthole ，mining or rock drilling.


API gauge (Casing Round Thread)
Gauge Code Outer dia. Ø Taper Gauge Code Outer dia. Ø Taper
4 1/2 (CSG,LCSG) 114.30 1:16 8 5/8 (CSG,LCSG) 219.08 1:16
5 (CSG,LCSG) 127.00 9 5/8 (CSG,LCSG) 244.48
5 1/2 (CSG,LCSG) 139.70 10 3/4 (CSG,LCSG) 273.05
6 5/8 (CSG,LCSG) 168.28 11 3/4 (CSG,LCSG) 298.45
7 (CSG,LCSG) 177.80 13 3/8 (CSG,LCSG) 339.73
7 5/8 (CSG,LCSG) 193.68 16 (CSG,LCSG) 406.40
The pitch of API gauges:3.175(8); The form angle of API thread gauge:60°
API gauge (Buttress Casing Thread)
Gauge Code Outer dia. Ø Taper Gauge Code Outer dia. Ø Taper
4 1/2 BCSG 114.30 1:16 8 5/8 BCSG 219.08 1:16
5 BCSG 127.00 9 5/8 BCSG 244.48
5 1/2 BCSG 139.70 10 3/4 BCSG 273.05
6 5/8 BCSG 168.28 11 3/4 BCSG 298.45
7 BCSG 177.80 13 3/8 BCSG 339.73
7 5/8 BCSG 193.68 16 BCSG 406.40 1:12
The pitch of API gauges:5.08(5); The form angle of API thread gauge:3°, 10°.
API gauge (Non-upset Tubing Thread)
Gauge Code Outer dia. Ø Pitch Taper Gauge Code Outer dia. Ø Pitch Taper
1.050 TBG 26.67 2.54(10) 1:16 2 7/8 TBG 73.03 2.54(10) 1:16
1.315 TBG 33.40 2.54(10) 3 1/2 TBG 88.90 2.54(10)
1.660 TBG 42.16 2.54(10) 4 TBG 101.60 3.175(8)
1.900 TBG 48.26 2.54(10) 4 1/2 TBG 114.30 3.175(8)
2 3/8 TBG 60.33 2.54(10)    
The form angle of API gauges:60°
API gauge (External-upset Tubing Thread)
Gauge Code Outer dia. Ø Pitch Taper Gauge Code Outer dia. Ø Pitch Taper
1.050 UPTBG 26.67 2.54(10) 1:16 2 7/8 UPTBG 73.03 3.175(8) 1:16
1.315 UPTBG 33.40 2.54(10) 3 1/2 UPTBG 88.90 3.175(8)
1.660 UPTBG 42.16 2.54(10) 4 UPTBG 101.60 3.175(8)
1.900 UPTBG 48.26 2.54(10) 4 1/2 UPTBG 114.30 3.175(8)
2 3/8 UPTBG 60.33 3.175(8)    
The form angle of API gauges:60°
API gauge (Line Pipe Thread)
Gauge Code Outer dia. Ø Pitch Taper Gauge Code Outer dia. Ø Pitch Taper
1/8 LP 3.18 0.941(27) 1:16 2 1/2 LP 63.50 3.175(8) 1:16
1/4 LP 6.35 1.411(18) 3 LP 76.20 3.175(8)
3/8 LP 9.53 1.411(18) 3 1/2 LP 88.90 3.175(8)
1/2 LP 12.70 1.814(14) 4 LP 101.60 3.175(8)
3/4 LP 19.05 1.814(14) 5 LP 127.00 3.175(8)
1 LP 25.40 2.209(11 1/2) 6 LP 152.40 3.175(8)
1 1/4 LP 31.75 2.209(11 1/2) 8 LP 203.20 3.175(8)
1 1/2 LP 38.10 2.209(11 1/2) 10 LP 254.00 3.175(8)
2 50.80 2.209(11 1/2)    
The form angle of API gauges:60°

  Reference hyperlink:  API thread gauge.