1. Introduction
The suck rod couplings are used for connecting sucker rods, polished rods and sinker bars. Material of the couplings can be high quality carbon steel or alloy steel, which are conform to or exceed the requirements of API Specification 11B.
2. Classification
A) The main types of sucker rod couplings are sucker rod couplings, polished rod couplings and sub-couplings (also called crossover couplings).
-The sucker rod couplings are used for connecting the sucker rod and sinker bars with the same dimensions.
Sucker rod couplings with same box thread size in both ends
-The polished couplings are designed to connect the polished rod and sinker bars.
Polished rod couplings with same box thread and vanish cone in both ends
-The sub-coupling is widely used for the connection of different sizes of sucker rod, pony rod and sinker bars.
Sub-couplings with different box thread size in both ends
B) All of the three types have two classes: class T and class SM.
-The class T stands for Through-hardened.
-The class SM stands for sprayed metal.
C) The outer diameter of the sucker rod couplings has Full Size and Slim Hole types.
D) According to the surface of the suck rod couplings, it can be divided into smooth surface suck rod couplings and suck rod couplings with two wrench square.
Smooth surface suck rod couplings
Sucker rod couplings with wrench square
3. Specification
Material: high quality carbon steel or alloy steel. (AISI 1045, AISI 4135).
Thread size: 5/8", 3/4", 7/8", 1" and 1-1/8".
Length: 4", 4.5" and 5".
Grade: T and SM.
Type: sucker rod coupling, polished coupling and sub-coupling.
Sucker rod couplings specification
Polished rod couplings specification
Sub-couplings specifications
4. Production Process
The sucker rod couplings are manufactured in their own production line.
Cleaned → prepared → loaded on mandrels → shot blasted → flame sprayed → induction fused
5. Package
The sucker rod couplings have two types of package.
Sucker rod couplings in carton package
Sucker rod couplings in wooden box package
