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Square Kelly
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Square Kelly

1. Designed and manufactured in accordance with API Spec 7-1 standards.

2. They are made of AISI 4142H-4145H forged or rolled alloy structural steel. 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.

Size

mm(in)

Length   of Drive Section

mm(ft)

Overall Length

mm(ft)

Upper Box Connection

Lower Pin Connection

I.D.mm(in)

Size&Style

O.D.mm(in)

Size&Style

O.D.

mm(in)

Length

mm(in)

Standard

Optional

Standard

Optional

Standard

Optional

Standard

Optional

63.5

2.1/2

11,280(37)


12,190(40)


(6.5/8)REG

(4.1/2)REG

196.9(7.3/4)

146.1(5.3/4)

NC26(2.3/8IF)

85.7(3.3/8)

508(20)

31.8(1.1/4)

76.2

3

11,280(37)


12,190(40)


(6.5/8)REG

(4.1/2)REG

196.9(7.3/4)

146.1(5.3/4)

NC31(2.7/8IF)

104.8(4.1/8)

508(20)

44.5(1.3/4)

88.9

3.1/2

11,280(37)


12,190(40)


(6.5/8)REG

(4.1/2)REG

196.9(7.3/4)

146.1(5.3/4)

NC38(3.1/2IF)

120.7(4.3/4)

508(20)

57.2(2.1/4)

108

4.1/4

11,280(37)

15.540(51)

12,190(40)

16,460(54)

(6.5/8)REG

(4.1/2)REG

196.9(7.3/4)

146.1(5.3/4)

NC46(4IF)

158.8(6.1/4)

508(20)

71.4(2.13/16)

108

4.1/4

11,280(37)

15.540(51)

12,190(40)

16,460(54)

(6.5/8)REG

(4.1/2)REG

196.9(7.3/4)

146.1(5.3/4)

NC50(4.1/2IF)

161.9(6.3/8)

508(20)

71.4(2.13/16)

133.4

5.1/4

11,280(37)

15.540(51)

12,190(40)

16,460(54)

(6.5/8)REG


196.9(7.3/4)


5.1/2FH

177.8(7)

508(20)

82.6(3.1/4)

133.4

5.1/4

11,280(37)

15.540(51)

12,190(40)

16,460(54)

(6.5/8)REG


196.9(7.3/4)


NC56

177.8(7)

508(20)

82.6(3.1/4)


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