1.AISI5140 material 2.API spec 11 B standard 3.Longer service life 4.Nickle wear resisting 5.high quality with competitiv Detailed introduction to sucker rod:API 11B sucker rod:1.Grade: C, K, D, KD2.Size: 5/8", 3/4", 7/8", 1", 1-1/8"3.Standard: API 11B4.Material: Carbon Steel5. Sucker rod/ pony rod/polished rod/ sucker rod coupling detailed specification:1. Varieties of API SPEC 11B size and type ...