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Sucker Rod Couplings

The Sucker Rod Couplings we supplied are manufactured in compliance with API 11B. Both of the Class T and Class SM couplings combine top quality steel with a cold rolled threads that increases their fatigue resistance capability.

A well controlled and service proved Anti-galling treatment is applied to all the couplings.

We offer a complete line of API sucker rod couplings, including sucker rod couplings, sub couplings, and polished rod couplings, with full size and slim hole.

Specifications 5/8” 3/4” 7/8” 1” 1 1/8”
Coupling Class T / SM
Base material Per API 11B or Chinese equivalent
Size type Full size, slim hole, crossover
Mech. Property Meet with API 11B requirement





Advantages of the SM, Sprayed Metal Sucker rod couplings

The Sprayed Metal Sucker Rod Couplings are coated with nickel base metal material and re-melted. Thickness of the SM coating is 0.01-0.02 in per side, Hardness is 595HV200 minimum.

The SM coupling features mirror like surface finish, low friction factor and high corrosion resistance property.


Availability and Part No. of the grade T & SM Sucker Rod Couplings

Sucker Rod Coupling
Size P.N.
5/8" Full Size 58MF
Slim Hole 58MS
3/4" Full Size 68MF
Slim Hole 68MS
7/8" Full Size 78MF
Slim Hole 78MS
1" Full Size 88MF
Slim Hole 88MS
1.1/8" Full Size 98MF
Slim Hole 98MS
Polish Rod Coupling
Size P.N.
5/8" Full Size 58MFP
Slim Hole 58MSP
3/4" Full Size 68MFP
Slim Hole 68MSP
7/8" Full Size 78MFP
Slim Hole 78MSP
1" Full Size 88MFP
Slim Hole 88MSP
1.1/8" Full Size 98MFP
Slim Hole 98MSP
Sub Coupling
Size P.N.
5/8"*3/4" Full Size 5868MF
Slim Hole 5868MS
3/4"*7/8" Full Size 6878MF
Slim Hole 6878MS
7/8"*1" Full Size 7888MF
Slim Hole 7888MS
1"*1 1/8" Full Size 8898MF
Slim Hole 8898MS






Note: For detailed sizes of polished rod couplings and Sub Couplings, please refer to the API Specification 11B


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