1)Deflection-proof and Abrasion-proof sucker rod coupling                       

2)Standard: API Spec 11B

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

4)Coat Material: Ni60A Alloy Coating

5)Coat Thickness: 0.01-0.02 in

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

7)Surface hardness: HRC 55-62

8)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: More than 180days