API 7/8" Class SM Full Size Sucker Rod Coupling

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"FHSM sucker rod coupling
Weight: 0.74kg
O. D.: 1 13/16(46.04mm)
Length: 4in(101.6mm)

API 7/8" Class SM Full Size Sucker Rod Coupling