Pump Parts

Balls & Seats
Barrels
Guide, Valve Rod, API
Guide, Valve Rod, 8-Port
Hold-Downs
Insert Cage
On/Off Tool
Pickup Sub
Rod Pump Plungers
Spiral Guide
Spool Check Valve
Sucker Rod Couplings

Production Accessories

Polished Rod Liner
Pressure Control Regulator
Hydraulic Tubing Drain

Stuffing Boxes

Com-Pac
Dual-Pac
Pollution Control Check Valve
Non-Aligning Union

SUCKER ROD COUPLINGS

Sucker rod couplings are a key component in the successful performance of a sucker rod string. By minimizing the wear and corrosion of couplings, the life of the sucker rod string is increased. This can substantially decrease service and repair costs. Dura Products has set an industry standard with the design of the Premier Performance Sucker Rod couplings including both API Class T (through hard) and API Class SM (spray metal) designs.

For excellent service in mild well environments the API Class T Coupling is the ideal choice. The Class T coupling is manufactured with a through hardiness of between 16 and 23 Rc. This results in high tensile and fatigue strength for the coupling. The outside diameter is smooth to minimize stress concentrations, and an accurate chamfer allows for controlled contact stress. The threads are rolled full form which results in compressive stresses at the thread root and improved fatigue resistance.

For harsh well environments the API Class SM Coupling is the proven leader, especially where severe wear and corrosion is a problem. The Class SM Coupling is also manufactured with a core hardness of between 16 and 23 Rc. This results in high tensile and fatigue strength similar to the Class T coupling. A nickel-chrome based coating [0.012"(0.3mm) minimum thickness] is thermally fused to the outside diameter. This results in a surface hardness ranging between 58-62 Rc which increases wear and corrosion resistance. The outside diameter is ground to a smooth finish and the coupling is inspected to ensure that there are no pinholes or cracks in the surface coating.