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