Sucker Rod Couplings

Sucker Rod Couplings (Class T, SM, UHS)

Description
Sucker rod couplings are used to connect sucker rod or pony rod. This kind of couplings can be classified as full size couplings and slim hole couplings. They can also be classified as class T, SM or HS couplings according to different classes. Except that, there is sub-coupling that is used to connect sucker rods of different sizes.

Advantages
We are capable of manufacturing all classes of couplings specified in API Specification 11B. Based on years of manufacturing experience, our technical team uses cold drawn tube as the raw material of threaded sucker rod couplings. This allows guaranteed quality as well as high cost efficiency of our API sucker rod couplings.

Parameter

Full Size Coupling
Size (in)	Coupling O.D. W (mm) (+0.13, -0.25)	Length L (mm) (+1.57, -0.00)	Nominal Diameter of Thread (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"
Note: customers can determine whether couplings need to be equipped with wrench flat or not.

Slim Hole Coupling
Size (in)	Coupling O.D. W (mm) (+0.13, -0.25)	Length L (mm) (+1.57, -0.00)	Nominal Diameter of Thread (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
Note: customers can determine whether couplings need to be equipped with wrench flat or not.

Full Size Sub Coupling
Size (in)	Coupling O.D. W (mm) (+0.13, -0.25)	Length L (mm) (+1.57, -0.00)	Diameter of Small End Thread (in)	Diameter of Big End Thread (in)	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)		Diameter of Small End Thread (in)	Diameter of Big End Thread (in)		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"
Mechanical Properties of Coupling
Tensile Strength Rm (Mpa)		Yield Strength Rel (Mpa)		Elongation A (%)			Reduction of Area Z (%)
≥ 655		≥ 405		≥ 16			≥ 48