1)Standard: API Spec 11B

2)Basic Material: AISI 5140 (40Cr),

3)Coat Material: Ni60A Alloy Coating                 

4)Coat Thickness: 0.01-0.02 in

5)Basic Hardness: HRC 16-23 (HRA 58-62)

6)Surface hardness: HRC 55-62

7)Metal coating hardness: 595 HV0.2

9)Hole rate: 2%

10)Smoothness: 3.1*10-3

11)Type: Full size/Slim Hole

12)Coupling diameter: 5/8 ", 3/4", 7/8", 1", 1-1/8"

13)Life: 180days

14)Main Specification of 7/8"SHSM sucker rod coupling

Weight: 0.74kg

O. D.: 1 13/16(46.04mm)

Length: 4in(101.6mm)