1. API 11B standard 2.Material: 4120,4142,4330,4720,4620 3. Sinter bar,polished rod and subcoupling are avaiable. Description : Our Sucker rod produced according to API 11B specification.The material is in Grade C, D, K, KD,H,I, HL, HY Specification parameter of sucker rodNominal Size of Rod (Steel)Diameter of Rod Body(mm)Outside Diameter of Pin shoulder(mm)Nominal Diameter of threadNominal Size ...