1.Name:sucker rod shaft coupling 2.Material:AISI 5140 3.Features:anticorrosion and durable use 3.Standard reference:API 11B Sucker rod shaft coupling is one of our flagship products. One shaft coupling must be processed by a few fabrication procedures, such as, Blanking, drilling hole, boring hole, milling, thread tapping, and so on. At the last step, do the surface treatment. The surface ...