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API Drill Collars

 

Drill Collars  Parameter

Size OD

Bore

Connection

Weight (kg)

Bevel

(in/mm)

(in/mm)

Type

30 feet

31 feet

Diameter

3 1/8 (79.4)

1 1/4 (31.8)

NC23

296

306

76.2

3 1/2 (88.9)

1 1/2 (38.1)

NC26

358

370

82.9

4 1/8 (104.8)

2 (50.8)

NC31

469

485

100.4

4 3/4 (120.7)

2 (50.8)

NC 35

629

650

114.7

5 (127)

2 1/4 (57.2)

NC38

716

740

121

6 (152.4)

2 1/4 (57.2)

NC44

1114

1151

144.5

6 (152.4)

2 13/16 (71.4)

4 1/2 FH

1011

1045

144.5

6 1/4 (158.8)

2 1/4 (57.2)

NC46

1224

1265

149.2

6 1/4 (158.8)

2 13/16 (71.4)

NC46

1123

1160

150

6 1/2 (165.1)

2 1/4 (57.2)

NC46

1340

1385

154.8

6 1/2 (165.1)

2 13/16 (71.4)

NC50

1237

1278

154.8

6 3/4 (171.4)

2 1/4 (57.2)

NC46

1024

1058

159.5

 

Connection Interchange List

NC (numbered Conn.)

26

31

38

40

46

50

IF (internal flush)

2 3/8

2 7/8

3 1/2

 

4

4 1/2

FH (full hole)

 

 

 

4

 

 

SH (slim hole)

2 7/8

3 1/2

4 1/2

 

 

 

XH (extra hole)

 

 

 

 

4 1/2

5

 

API Mechanical Properties of  Drill Collars

Outside Diameter

Outside Diameter

Tensile Strength

Yield Strength

Elongation (L=4D)

Impact AKV

Brinell Hardness

Inch

mm

Mpa

Mpa

%

J

HB

3 1/8-6 3/4

79.4-171.4

≥965

≥758

≥13

≥54

≥285

7-10

177.8-254

≥930

≥689

≥13

≥54

≥285