5/8"*3/4"FS API Sub coupling
1)Type: T&SM
2)Material: Carbon steel AISI 5I40 or AISI 4135
3)SM Coupling Spray Material: Ni60A Alloy Coating
4)Basic Hardness: HRC 16-23
5)SM Coupling Surface Hardness: HRC 55-62
6)SM Coupling Hole rate: <2%
7)SM Coupling Min. Hardness of the layer: 595HV0.2
8)Standard: API Spec 11B
9)Coupling diameter: 5/8"*3/4"
10)Package: wooden cases
11)Payment Terms: T/T