... ,4142,4330,4720,4620 3. Sinter bar,polished rod and subcoupling are avaiable. Description : Our Sucker rod produced according to ... K, KD,H,I, HL, HY Specification parameter of sucker rodNominal Size of Rod (Steel)Diameter of Rod Body(mm ... Pin shoulder(mm)Nominal Diameter of threadNominal Size of Sucker Rod length(mm)Pony Rod(mm)5/8"φ15 ... center rigidity HB ≥224,quench rigidity depth 1.5~3.0mm sucker rod