API Weight Drill Pipe 3-1/2＂-6-5/8＂

Size

Tube OD 
(+1/16,-1/32)

Tube OD 1

Tool Joint OD
(+1/16,-1/32)2

Tool Joint OD
(+1/8,-0)

Connection

Max Elevator Upset Dia

Center Upset Dia
(+1/16,-1/32)

Min Drift Dia3

Deu

Dcu

3 1/2

3 1/2

2 1/4

4 3/4
(4 7/8,5)

2 1/4

NC 38

3 7/8

4

2

2 1/16

2 1/16

1 13/16

4

4

2 1/2

5 1/4

2 1/2

NC 40

4 3/16

4 1/2

2 1/4

2 9/16

2 9/16

2 5/16

4 1/2

4 1/2

2 11/16

6 1/4

2 11/16

NC 46

4 11/16

5

2 7/16

2 3/4

2 3/4

2 1/2

2 13/16

2 13/16

2 9/16

5

5

3

6 5/8

3

NC 50

5 1/8

5 1/2

2 3/4

5 1/2

5 1/2

3 1/4

7
(7 1/4,7 1/2)

3 1/4

5 1/2 FH

5 11/16

6

3

3 3/8

3 3/8

3 1/8

3 7/8

3 7/8

3 5/83/4

4

4

3 3/4

6 5/8

6 5/8

4

8
(8 1/4,8 1/2)

4

6 5/8 FH

6 15/16

7 1/8

3 3/4

4 1/2

4 1/2

4 1/4

5

5

4 3/4

1.Maximum tube ID is 1/8 larger than nominal.Minimum tube ID is controlled by the drift requirement. 
2.Optional Tool Joint ODs shown in parenthesis,to be agreed between purchaser and manufacturer. 
3.Drift Diameter is based on ID tolerances of heavy wall pierced tube used for the center section...

Standard

API 5CT,SY/T6194-96

Size

OD:21.3-609MM WT:2-22MM Length:6-12m

Material

H-40,J-55,K-55,N-80,C-75,L-80,C-90,C-95,P-110,Q-125

Thread type

LTC (long round thread casing connection) STC (short round thread casing connection) BTC(buttress thread)

Length

R-1:4.88~7.62m

R-2:7.62~10.36m

R-3:more than 10.36m

Application

Used in oil well drilling.It is mainly used for drilling process and after

completion of borehole wall support, to ensure that the drilling process

and the whole Wells after completion are normal running .