... the important equipment in oil field. Liande can provide sucker rods including grade C, K, D, KD, HL, ... and KH. Among them, grade C, K, D sucker rods are designed and manufactured according to the API Spec ... -well widely. Grade HL and HY sucker rods are super-high strength sucker rod, having the same size and ... capable to reach 966~1195Mpa. Grade HL, HY sucker rods are suitable for the deep oil-well or ...