... provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade C, K, ... and manufactured according to the API Spec 11 B, grade KD, HL and HY according to SY/T5029-2006 standard ... or light-corrosion environment oil-well widely. Grade HL and HY sucker rods are super-high strength sucker ... their strength is capable to reach 966~1195Mpa. Grade HL, HY sucker rods are suitable for the deep oil ...