Sucker Rod Coupling

1)Types: Class T & class SM;Full size & Slim hole; Sub coupling & polished rod coupling &pony rod coupling 

2)New Products: sucker rod coupling with big chamfer,Both-way Globoidal Protection sucker rod coupling
3)Material: seamless alloy steel AISI 5140
4) SM coupling coating material : Ni60A Alloy.
5)Basic Hardness: HRC 16-23
6)Surface Hardness: HRC 55-62
7)Hole rate: 2%
8)Min. Hardness of the layer: 595HV0.2
9)Standard: API Spec 11B
10)Coupling diameter: 5/8",3/4",7/8",1",1-1/8"
11)Package: wooden case

12)Payment: T/T