Yantai Yunsheng Petroleum Machine Accessories, Co., Ltd , funded in 1997, presently is one of biggest enterprises producing double protection sucker rod couplings inside China. We now have more than 10 production lines then we can supply 20000 pcs SM sucker rod coupling per month.

All of our couplings including API Class T Sucker Rod Couplings, API spray metal sucker rod couplings and API Change-Over Sucker Rod Couplings are made full in line with API SPEC 11B, with the size range of 5/8, 3/4, 7/8, 1, 1-1/8.

                    Paramater of coupling perfomance

                     1-1/8 " FS API Class SM coupling

1-Type: SM  FS coupling

2-Coupling diameter: 1 -1/8"

   -O.D: 2-3/8" [60.33mm]

   -I.D: 1-9/16" [39.69mm]

   -Length: 4.5"[114.3mm]

3-Weight:1.29 KG/Pcs

4-Material: AISI 5I40

5-Spray Material Ni60A Alloy Coating

6-Basic Hardness: HRC 16-23

7-Surface Hardness: HRC 55-62

8-Hole rate: 2%

9-Min. Hardness of the layer: 595HV0.2

10-Coat Thickness(in): 0.01in ~ 0.02in

11-Operating Temperature: -1000~400

12--Life: > 180 days

13-Standard: API Spec 11B

14-Package: wooden case

15-Payment Terms: T/T

Our New Products

1) Full Size SM Coupling with great bevel edge

2) Two-way Cambered Protection SM Coupling

If you have any interest in our sucker rod couplings, please do not hesitate to let we know, and well supply you with our high quality products and best services.

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.