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Sucker rod couplings in details:1) Material: AISI 5140
2) Standard: API Spec 11B
3) Main specification:
OD:1-5/8" (41.30mm)
ID: 1-3/16"(30.16mm)
Length: 4" (101.6mm)
Weight: 0.52kg
4)Other Size: 5/8"; 3/4";1"; 1-1/8"
5)Smoothness: 3.1*10-3
6)Coat Thickness(in): 0.01in ~ 0.02in
7)Basic hardness: HRC 16-23
8)Surface Hardness: HRC 55-62
