sub coupling in details:

Application: sub coupling are used for connecting two size of sucker rod, also including the SM coupling and T coupling, with specification of Full size, Slim hole and Over size. The permit work load is 80 KN and the damage load is 238KN.

Model type: Slim Hole & Full Size& Over Size

Size: 5/8"*3/4",3/4"*7/8",7/8"*1",1"*1-1/8"

 Other specification: sucker rod coupling/polished rod coupling/sub coupling