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Thread gauge & Single instrument

We are the first company in China that specializes in selling API thread gages and offering rofessional calibration services. All gages come with third-party calibration that are traceable to China National Institute of Metrology and NIST.

We are serving 60% of the OCTG manufacturers and oilfield service companies in China, which include China National Petroleum Corporation, China Petrochemical Corporation, China National Offshore Oil Corporation, Wuxi Seamless Oil Pipes Company Limited, Baker Hughes China, Weatherford China, etc.

NON-UPSET TUBING(NU/TBG)

Size

Major Diameter

Pitch Diameter

T.P.I.

T.P.F.

Standoff Tolerance

1.660

42.16

40.596

10

1:16

7.6200.635

1.900

48.26

46.692

2-3/8

60.32

58.757

2-7/8

73.02

71.457

3-1/2

88.90

87.332

4

101.60

99.414

8

9.5250.635

4-1/2

114.30

112.114

UPSET TUBING(EU/UPTBG)

Size

Major Diameter

Pitch Diameter

T.P.I.

T.P.F.

Standoff Tolerance

1.660

42.16

44.470

10

1:16

7.6200.635

1.900

48.26

51.614

2-3/8

60.32

63.697

8

9.5250.635

2-7/8

73.02

76.397

3-1/2

88.90

93.064

4

101.60

105.764

4-1/2

114.30

118.464

CASING SHORT-THREAD(CSG)

Size

Major Diameter

Pitch Diameter

T.P.I.

T.P.F.

Standoff Tolerance

4-1/2

114.30

111.846

8

1:16

9.5250.635

5

127.00

124.546

5-1/2

139.70

137.246

6-5/8

168.28

165.821

7

177.80

175.346

7-5/8

193.68

191.114

8-5/8

219.08

216.514

9-5/8

244.48

241.914

10-3/4

273.05

270.489

11-3/4

298.45

295.889

13-3/8

339.72

337.164

16

406.40

403.839

18-5/8

473.08

470.514

20

508.00

505.439

CASING LONG-THREAD(LCSG)

Size

Major Diameter

Pitch Diameter

T.P.I.

T.P.F.

Standoff Tolerance

4-1/2

114.30

111.846

8

1:16

9.5250.635

5

127.00

124.546

5-1/2

139.70

137.246

6-5/8

168.28

165.821

7

177.80

175.346

7-5/8

193.68

191.114

8-5/8

219.08

216.514

9-5/8

244.48

241.914

20

508.00

505.439

BUTTRESS CASING(BCSG)

Size

Major Diameter

Pitch Diameter

T.P.I.

T.P.F.

Standoff Tolerance

4-1/2

114.71

113.132

5

1:16

2.5400.381

5

127.41

125.832

5.0800.381

5-1/2

140.11

138.532

6-5/8

168.68

167.107

7

178.21

176.632

7-5/8

194.08

192.507

8-5/8

219.48

217.907

9-5/8

244.88

243.307

10-3/4

273.46

271.882

11-3/4

298.86

297.282

13-3/8

340.13

338.557

16

406.40

404.825

1:12

4.4450.381

18-5/8

473.08

471.500

20

508.00

506.425

LINE PIPE(LP)

Size

Major Diameter

Pitch Diameter

T.P.I.

T.P.F.

Standoff Tolerance

1-1/4

42.16

40.218

11-1/2

1:16

6.6292.210

1-1/2,

,

48.26

46.287

2

60.32

58.325

2-1/2

73.02

70.159

8

9.5252.540

3

88.90

86.068

3-1/2

101.60

98.776

4

114.30

111.433

5

141.30

138.412


NUMBERED CONNECTIONS(NC)

Size

Thread Form

T.P.I.

T.P.F.

Pitch Diameter

Standoff Tolerance

NC23

V-0.038R

4

1:6

59.817

15.8750.100

NC26(IF 2-3/8)

67.767

NC31(IF 2-7/8)

80.848

NC35

89.687

NC38(IF 3-1/2)

96.732

NC40(FH4)

103.429

NC44

112.192

NC46(IF 4)

117.500

NC50(IF 4-1/2)

128.059

NC56

1:4

142.646

NC61

156.921

NC70

179.146

NC77

196.621

REGULAR ROTARY(REG)

Size

Thread Form

T.P.I.

T.P.F.

Pitch Diameter

Standoff Tolerance

REG 2-3/8

V-0.040

5

1:4

60.080

15.8750.100

REG 2-7/8

69.605

REG 3-1/2

82.293

REG 4-1/2

110.868

REG 5-1/2

V-0.050

4

132.944

REG 6-5/8

1:6

146.248

REG 7-5/8

1:4

170.549

REG 8-5/8

194.731

FULL HOLE(FH)

Size

Thread Form

T.P.I.

T.P.F.

Pitch Diameter

Standoff Tolerance

FH 3-1/2

V-0.040

5

1:4

94.844

15.8750.100

FH 4(NC40)

V-0.065

4

1:6

103.429

FH 4-1/2

V-0.040

5

1:4

115.113

FH 5-1/2

V-0.050

4

1:6

142.011

FH 6-5/8

V-0.050

4

1:6

165.598

INTERNAL FLUSH(IF)

Size

Thread Form

T.P.I.

T.P.F.

Pitch Diameter

Standoff Tolerance

IF 2-3/8(NC26)

V-0.065

4

1:6

67.767

15.8750.100

IF 2-7/8(NC31)

80.848

IF 3-1/2(NC38)

96.732

IF 4(NC46)

117.500

IF 4-1/2(NC50)

128.059

IF 5-1/2

157.201

Single instrument

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