... SIZE, SLIM HOLE, SM & T SUCKER ROD COUPLING BRIEF7/8" SPRAY METAL SUCKER ROD COUPLING;API 11B APROVAL MANUFACTUER(11B-0088 ... a professional manufacturer of API 11B sucker rod couplings, including Spray Metal coupling, class T coupling, Sub OD coupling, with various ... bars for raw material, AISI 5140. 2. CNC precision sizes3. Thermal Spray Welding 4. Rolled Thread, made by Extrusion Tap 5. Phosphating ...