The sucker rod coupling have the same box thread size in each end are used for connecting sucker rod and/or pony rod, and/or sinker bars with sucker rod threads. Specification: 5/8”, 3/4”, 7/8”, 1”, 1-1/8Class: T, SM (Spraying Metal)Standard: API 11B

Southeast Asia customer purchasing our company's production equipment, products include 3/4 x25ft, 7/8 x25ft of sucker rod and nipple, 25-125 RHAM, 25-150 RHAM, 30-175 RHAM sucker rod pump, DPSB stuffing box, wheeled sucker rod centralizer, Twist On sucker rod centralizer, T-class sucker rod couplin