1.In high quality but low price
2.Up to API Spec 11B
3.Basic material is AISI5140
4.Small order can be available
5Enjoyed good reputation.

API 3/4"to7/8" SUB Sucker Rod Coupling
1) The sub sucker rod couplings are used to connect two varisized sucker rod.
2) Basic Material: High quality carbon steel AISI 5140(40Cr)
3) SM Coating Material: Ni60A Alloy Coating
4) Basic Hardness: HRC 16-23
5) Surface Hardness: HRC 55-62
6) Hole rate: 2%
7) Smoothness: 3.1×10-3
8)Min. Hardness of the layer: 595HV0.2
9) Type: SM/T, Full size/ Slim Hole
10) OtherCoupling diameter: 5/8"to3/4 ",7/8"to1", 1"to1-1/8"
11)Weight:0.92kg
O.D.:1-13/16(46.04mm）
Length:4in(101.6mm)
12) Life: more than 180days

Moreover, Yunsheng sucker rod coupling includes Class SM sucker rod coupling,T sucker rod coupling, Full Size sucker rod coupling, Slim Hole sucker rod coupling, all of them are up to API 11 B and available in size of 5/8", 3/4", 7/8", 1"and 1-1/8"
If you are interested in any of our sucker rod couplings, please contact us freely.
Mailbox : melody (at)ytyunsheng (dot)com
Yahoomelodyyunsheng(at)yahoo(dot)cn

Due to we are the professional manufacturer, we have enough room to give you a best offer according to your real case.