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HOME >Leading Products >Kelly
Kelly

3 in
Design Specifications
Length (ft) 40
Standard or optional Standard
Top Connection Connection : 6 5/8REG
OD(in) : 7 3/4
Operating Parameters
Bottom Connection Connection : NC31
OD(in) : 4 1/8
Across Corners DC (mm) 100.0
ID (in) 1 3/4
Weight (kg) 466

●API Square Kelly,Product Schematic Diagram.

四方钻杆示意图.jpg

Kelly is the driven part of the whole drill string.

Kelly is divided into Square Kelly and Hexagonal Kelly. WOLFNI Kelly all conform to API Spec7-1.

The length of Kelly extends from 11meters, 12meters,16meters,and to the longest 27 meters.(connected with tool joint of high torsion resistance)



API Square Kelly 

Size

(in)


Length

(ft)

Standard 

or 

optional

Top Connection Bottom Connection Across Corners

ID

(in)


Weight (kg)
Connection

OD

(in)

Connection

OD

(in)

DC 

mm

2 1/2"
 40 Standard 6 5/8REG 7 3/4 NC26 3 3/8 83.3 1 1/4 389
40 Optional 4 1/2REG 5 3/4 NC26 3 3/8 83.3 1 1/4 349
3"
 40 Standard 6 5/8REG 7 3/4 NC31 4 1/8 100.0 1 3/4 466
40 Optional 4 1/2REG 5 3/4 NC31 4 1/8 100.0 1 3/4 436
3 1/2"
 40 Standard 6 5/8REG 7 3/4 NC38 4 3/4 115.1 2 1/4 560
40 Optional 4 1/2REG 5 3/4 NC38 4 3/4 115.1 2 1/4 532
4 1/4" 40 Standard 6 5/8REG 7 3/4 NC46 6 1/4 141.3 2 13/16 792
40 Optional 4 1/2REG 5 3/4 NC46 6 1/4 141.3 2 13/16 756
4 1/4"
 40 Standard 6 5/8REG 7 3/4 NC50 6 3/8 141.3 2 13/16 793
40 Optional 4 1/2REG 5 3/4 NC50 6 3/8 141.3 2 13/16 758
5 1/4" 40 Standard 6 5/8REG 7 3/4 5 1/2FH 7 175.4 3 1/4 1202
40 Standard 6 5/8REG 7 3/4 NC56 7 175.4 3 1/4 1196


With advanced sales network, our products

export to Russia, Germany, Czech Republic,

Iran, UAE,  Kuwait, India, Kazakhstan, 

Indonesia, Algeria, Argentina, Brazil, etc.



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