drill pipe

Standard Size and Connections of Drill Pipes 

OD 

Grade

Wall Thickness 

Upset Ends,for
Weld-on Tool
Joints(see note) 

Tool Joint

inch

mm

inch

mm

2 7/8 

73.0

E.X.G.S

0.217

5.51

EU

NC31

0.308

7.82

EU

NC31.NC26

0.362

9.19

EU

NC31

3 1/2 

88.9

E.X.G.S

0.254

6.45

EU

NC38

0.368

9.35

EU

NC38.NC40

0.449

11.40

EU

NC38.NC40

4

101.6

E.X.G.S

0.262

6.65

EU.IU

NC40.NC46

0.330

8.38

EU.IU

NC40.NC46

0.380

9.65

EU.IU

NC40.NC46

4 1/2

114.3

E.X.G.S

0.271

6.88

EU.IEU

NC46.NC50

0.337

8.56

EU.IEU

NC46.NC50

0.430

10.92

EU.IEU

NC46.NC50

0.500

12.70

EU.IEU

NC50

Standard Size and Connections of Drill Pipes 

OD 

Grade

Wall Thickness 

Upset Ends,for
Weld-on Tool
Joints(see note) 

Tool Joint

inch

mm

inch

mm

4 1/2 

114.3

E.X.G.S

0.550

13.97

EU.IEU

NC50

0.575

14.61

EU.IEU

NC50

5

127.0

E.X.G.S

0.296

7.52

IEU

NC50

0.362

9.19

IEU

NC50

0.500

12.70

IEU

NC50.5 1/2FH 

5 1/2 

139.7

E.X.G.S

0.304

7.72

IEU

5 1/2 FH

0.361

9.17

IEU

5 1/2 FH

0.415

10.54

IEU

5 1/2 FH

6

152.4

E.X.G.S

0.324

8.23

IEU

5 1/2 FH

0.380

9.65

IEU

5 1/2 FH

6 5/8 

168.3

E.X.G.S

0.330

8.38

IEU

5 1/2 FH

0.362

9.19

IEU

5 1/2 FH