1 Type: SM FS and SH coupling
2 Coupling diameter: 5/8 ",3/4",7/8",1",1-1/8"
3 Weight: 0.41-1.29 KG/Pcs
4 Material: AISI 5I40 or AISI4140
5 Spray Material：Ni60A Alloy Coating
6 SM Thickness：0.01-0.02in
7 Basic Hardness: HRC 16-23
8 Surface Hardness: HRC 55-62
9 Hole rate: ＜2%
10 Min. Hardness of the layer:595HV0.2
11 Operating Temperature: -1000~400℃
12 Life:> 180 days
13 Standard: API Spec 11B
14 Package: wooden case
Our New Products
2) Two-way Cambered Protection Coupling
If you have any interest in our sucker rod couplings, please do not hesitate to let we know, and we’ll supply you with our high quality products and best services.
