The Kellys are made from AISI 4145 H Modified Alloy bars which are quenched and tempered full length. A Hardness range of 285-341 BHN and a minimum impact value of 40ft. lbs is maintained one inch below the surface at room temperature. All ends and centre drive sections are machined. The Kellys are precision trepanned to provide true bores. They are drifted to API Specifications 7-1 and all connections are precision machined and tested to stringent quality standards.

 

DIMENSIONAL DATA

SQUARE KELLYS

Nom Size

Available
Lengths
(Ft.) (A)
Top Upset
Bottom Upset
Bore
(D)
Drive Section
Approx wt. 40ft (lbs)
API Box Thread Left Hand
OD
(B)
Right Hand
Connection
OD
(C)
Across Corners
(E)
Across Flats
(F)
3 1/2
40, 42, 46
6 5/8 Reg
4 1/2 Reg
7 3/4
5 3/4
NC 38 (3 1/2 IF)
4 3/4
2 1/4
4.437
3 1/2
1320
4 1/4
40, 42, 46
6 5/8 Reg
4 1/2 Reg
7 3/4
5 3/4
NC 46 (4 IF)
NC 50 (4 1/2IF)
6 1/4
6 3/8
2 13/16
5.500
4 1/4
1820
5 1/4
40, 42,
46, 54
6 5/8 Reg
7 3/4
NC 56 or
5 1/2 FH
7
3 1/4
6.750
5 1/4
2780
6
40, 42, 46
6 5/8 Reg
7 3/4
6 5/8 Reg
7 3/4
3
7.625
6
3700

         All dimensions are in inches unless otherwise specified

HEXAGONAL KELLYS
Nom Size

Available
Lengths
(Ft.) (A)
Top Upset
Bottom Upset
Bore
(D)
Drive Section
Approx wt. 40ft (lbs)
API Box Thread Left Hand
OD
(B)
Right Hand
Connection
OD
(C)
Across Corners
(E)
Across Flats
(F)
3 1/2
40, 42, 46
6 5/8 Reg
4 1/2 Reg
7 3/4
5 3/4
NC 31 (2 7/8 IF)
4 1/8
1 3/4
3.937
3 1/2
1300
1200
4 1/4
40, 42, 46
6 5/8 Reg
4 1/2 Reg
7 3/4
5 3/4
NC 38 (3 1/2 IF)
4 3/4
2 1/4
4.781
4 1/4
1740
5 1/4
40, 42,
46, 54
6 5/8 Reg
7 3/4
NC 46 (4 IF)
NC 50 (4 1/2 IF)
6 1/4
6 3/8

2 13/16
3, 3 1/4
5.900
5 1/4
2550
6
40, 42, 46
6 5/8 Reg
7 3/4
NC 56 or 5 1/2 FH
7
3 1/2
6.812
6
3040

             All dimensions are in inches unless otherwise specified

When ordering or requesting quotations on Kellys, please specify: 
1 Hexagonal or Square Kelly
2 Nominal Size (Section F)
3 Bore (Section D)
4 Size and Type of Top Connection
5 Size and Type of Bottom Connection
6 Top Upset OD (Section B)
7 Bottom Upset (Section C)
8 Packaging Plain Shipping Scabbards available

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