SM‑SH Treated Sucker Rod Coupling

7/8" SM SH sucker rod fitting is manufactured strictly in accordance with API Spec 11B 28th Edition. This equal-diameter fitting without wrench flats acts as essential connection hardware to assemble Sucker Rod Couplings in pumping systems. Multiple Material Grade options are available to adapt to diverse downhole environments, and Wrench Flat Couplings style fittings are offered as an alternative choice.   TC carbon steel delivers good cost performance for shallow non-corrosive oil wells. TA Alloy Steel Couplings balances hardness and toughness with anti-galling threads, suitable for medium-depth oil production. TS high-strength alloy steel withstands heavy loads and fits deep well service with precise dimensional control.   Stable mechanical properties: minimum tensile strength ≥655MPa, yield strength ≥414MPa. Two surface treatments are optional: bare metal and Sprayed Metal Couplings finishing. Besides 7/8" size, we provide full specifications: 5/8", 3/4", 1", 1-1/8". Our…