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Kelly

Kelly is the driving section of whole drilling system, available with square kelly and hexagonal kelly.

We can manufacture strictly by API Spec7-1 and SY/T6509-2000 standard or as requirements of clients.

Raw materials: AISI 4142H-4145H forged or rolled alloy structural steel.

Heat treatment:Quenching plus tempering thermal treatment will be conducted over the whole length. Its Brinell hardness can reach 285-341 on the basis  of such thermal treatment. Charpy impact energy: 54J. The formulated process can ensure that the misalignment of the hole reaches the standard wall thickness.  

   Square Kelly                      

Size

Standard length

Upper box connection

Lower pin connection

I.D(mm)

Driving section(mm)

 Thread type(LH)

O.D(mm)

Thread type(LH)

O.D(mm)

Width across flats

Diagonal width

in

ft

Standard

Optional

Standard

Optional

Standard

Standard

Standard

2 1/2

40

6 5/8REG

4 1/2REG

196.8

146

NC26

85.7

31.8

63.5

83.3

3

40

6 5/8REG

4 1/2REG

196.8

146

NC31

104.8

44.4

76.2

100

3 1/2

40

6 5/8REG

4 1/2REG

196.8

146

NC38

120.6

57.2

88.9

115.1

4 1/4

40

6 5/8REG

4 1/2REG

196.8

146

NC46

158.8

71.4

108

141.3

40

6 5/8REG

4 1/2REG

196.8

146

NC50

161.9

71.4

108

141.3

5 1/4

40

6 5/8REG

/

196.8

/

5 1/2FH

177.8

82.6

133.3

175.4

40

6 5/8REG

/

196.8

/

NC56

177.8

82.6

133.3

175.4

Hexagonal Kelly                  

Size

Standard length

Upper box connection

Lower pin connection

I.D(mm)

Driving section(mm)

 Thread type(LH)

O.D(mm)

Thread type(LH)

O.D(mm)

Width across flats

Diagonal width

in

ft

Standard

Optional

Standard

Optional

Standard

Standard

Standard

3

40

6 5/8REG

4 1/2REG

196.8

146

NC26

85.7

31.8

76.2

85.7

3 1/2

40

6 5/8REG

4 1/2REG

196.8

146

NC31

104.8

44.4

88.9

100.8

4 1/4

40

6 5/8REG

1/2REG

196.8

146

NC38

120.6

57.2

108

122.2

40

6 5/8REG

4 1/2REG

196.8

146

NC38

120.6

57.2

108

122.2

5 1/4

40

6 5/8REG

/

196.8

/

NC46

158.8

76.2

133.3

151.6

40

6 5/8REG

/

196.8

/

NC50

161.9

82.6

133.3

151.6

6    

40

6 5/8REG

/

196.8

/

5 1/2FH

177.8

88.9

152.4

173

40

6 5/8REG

/

196.8

/

NC56

177.8

88.9

152.4

173



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