Sucker Rod Coupling

Class T and Class SM coupling for sucker rods are manufactured as per API 11B Class T coupling is using AISI 5140 to manufacture. AS for Class SM coupling, the spray metal is a specified hardening process which is used on the base metal. The couplings are available in full size, slim hole and over size. Also, combination couplings are available for different diameters (sub-coupling) for both Class T and Class SM couplings
Full Size Coupling
Size(in)
Coupling O.D W(mm)
(+0.13,-0.25)
Length L(mm)
(+1.57,-0.00)
Thread D.(in)
Length of Wrench Square
(mm)
Hardness(HRA)
5/8"
38.10
101.6
15/16"
31.8
56-62
3/4"
41.28
1-1/16"
7/8"
46.00
1-3/16"
1"
55.60
1-3/8"
38.1
1-1/8"
60.33
114.3
1-9/16"
Slim-hole Coupling
Size(in)
Coupling O.D W(mm)
(+0.13,-0.25)
Length L(mm)
(+1.57,-0.00)
Thread D.(in)
Length of Wrench Square
(mm)
Hardness(HRA)
5/8"
31.75
101.6
15/16"
31.8
56-62
3/4"
38.10
1-1/16"
7/8"
41.30
1-3/16"
1"
50.80
1-3/8"
38.1
Full Size Sub-coupling
Size(in)
Coupling O.D W(mm)
(+0.13,-0.25)
Length L(mm)
(+1.57,-0.00)
Small End Thread D.
Big End Thread D.
Hardness(HRA)
5/8"-3/4"
41.28
101.6
15/16"
1-1/16"
56-62
3/4"-7/8"
46.00
1-1/16"
1-3/16"
7/8"-1"
55.60
114.3
1-3/16"
1-3/8"
1"-1-1/8"
60.33
127.0
1-3/8"
1-9/16"
Slim-hole Sub-coupling
Size(in)
Coupling O.D W(mm)
(+0.13,-0.25)
Length L(mm)
(+1.57,-0.00)
Small End Thread D.
Big End Thread D.
Hardness(HRA)
5/8"-3/4"
38.10
101.6
15/16"
1-1/16"
56-62
3/4"-7/8"
41.30
1-1/16"
1-3/16"
7/8"-1"
50.80
114.3
1-3/16"
1-3/8"
Full Size Polished Connection
Size(in)
Coupling O.D W(mm)
(+0.13,-0.25)
Length L(mm)
(+1.57,-0.00)
Thread D.(in)
Vanish Cone
Hardness(HRA)
5/8"
38.10
101.6
15/16"
9O
56-62
3/4"
41.28
1-1/16"
7/8"
46.00
1-3/16"
1"
55.60
1-3/8"
1-1/8"
60.33
114.3
1-9/16"
Slim Hole Polished Connection
Size(in)
Coupling O.D W(mm)
(+0.13,-0.25)
Length L(mm)
(+1.57,-0.00)
Thread D.(in)
Vanish Cone
Hardness(HRA)
5/8"
31.75
101.6
15/16"
9O
56-62
3/4"
38.10
1-1/16"
7/8"
41.30
1-3/16"
1"
50.80
1-3/8"
Coupling Mechanical Properties
Tensile Strength
Rm(Mpa)
Yield Strength
Rel(Mpa)
Elongation
Percentage A(%)
Reduction Percentage
of Area Z(%)
≥655
≥405
≥16
≥48
Baotou Liande Oil and Mechanical Co., Ltd.
E-mail: ldsy_com@126.com

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