1)Standard: API Spec 11B

2)Basic Material: AISI 5140 (40Cr),AISI 4140 (42Cr) for UHS sucker rod coupling

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: 0.52kg

Yantai Yunsheng Petroleum Machine Accessories Co. Ltd., founded in 2005, is a professional manufacturer of API Spec 11B Sucker Rod Couplings, including Spray Metal coupling, class T coupling, Sub OD coupling, with various type of Full size, Slim Hole, Over Size, with Big Chamfer, with Wrench Flat, with Bidirectional Cambered Surface Protection, etc., and the thread size are available at 5/8", 3/4", 7/8", 1", 1-1/8".  Owning world top level equipments and technicians, the monthly production capacity is more than 20,000pcs.  All of our couplings are excellent in Quality and reasonable in Price, and the production & inspection are being done fully in accordance with API Spec11B standard.