Yunsheng sucker rod couplings are up to API Spec 11B standard, including class SM sucker rod coupling, class T sucker rod coupling, Sub sucker rod coupling, Full Size sucker rod coupling, Slim Hole sucker rod coupling, are availbale in size of 5/8", 3/4", 7/8", 1" and 1-1/8". With over 30000PCS monthly capacity. Manufactured with high quality Carbon steel AISI 5I40. Our surface alloy thermal spray coating process of our spray metal sucker rod coupling has reached the international advanced level. 

API 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 

8. Type: Full size/Slim Hole 

9. Coupling diameter: 5/8 ", 3/4", 7/8", 1", 1-1/8"

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.