Square and Hexagonal Kellys


K
ellys are made from 4145H alloy steel, which are quenched and tempered along the full length. A hardness range of 285 to 341 BHN and a minimum impact value of 54 Joules as per ASTM A 370 Charpy-V, these value are guaranteed one inch below the surface. Kelly ends and drive sections, internal diameters and connections are machined and inspected to API specifications. The kelly bars are inspected by an ultrasonic unit over their full length and full section. The wall thickness of each flat of the drive section is verified ultrasonically on each kelly. All kellys are supplied with pressed steel protectors.

 

 

Standard Sizes for Square Kellys

Nom.
Size
(in)
Standard Length
(ft)
Top upset
Bottom upset
Bore
Drivesection
Approx Weight (kg)
LH connection
OD C(in)
RH Connection
OD(in)
E(in)
F(in)
G(in)
2-1/2
40 46
6-5/8Reg
7-3/4
NC26-2-3/8IF
3-3/8
1-1/4
3.25
2-1/2
400 460
3
40 46
6-5/8Reg
7-3/4
0NC31-2-7/8IF
4-1/8
1-3/4
3.875
3
495 555
4-1/4
40 46 54
6-5/8Reg
7-3/4
NC46-41F or NC50-4-1/2IF
6 or 6-3/8-6-1/2
2-13/16
5.5
4-1/4
820 930 1,080
5-1/4
40 46 54
6-5/8Reg
7-3/4
NC56 or 5-1/2FH
7
3-1/4
6.75
5-1/2
1,245 1,425 1,665
6
40 46 54
6-5/8Reg
7-3/4
6-5/8FH
8
3-1/2
7.625
6
1,670 1,915 2,245


Standard Sizes for Hexagonal Kellys

Nom.
Size
(in)
Standard Length
(ft)
Standard top upset
Bottom upset
Bore
Drivesection
Approx Weight (kg)
LH connection
OD C(in)
RH Connection
OD(in)
E(in)
F(in)
G(in)
3
40 46