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    API Class SM sucker rod coupling

1-Type: SM  FS sucker rod coupling

2-Material: Carbon steel AISI 5I40or AISI4140

3-Spray Material：Ni60A Alloy Coating

4-Basic Hardness: HRC 16-23

5-Surface Hardness: HRC 55-62

6-Hole rate: ＜2%

7-Min. Hardness of the layer: 595HV_0.2

8-Standard: API Spec 11B

9-Coupling diameter: 3/4 "

10-Weight: 0.60 KG/Pcs

11-Package: wooden cases

12-Payment Terms:T/T