Ceramic Ball Bearings 陶瓷轴承 smr95c 2rs 滚珠陶瓷混合轴承 3x6x2 4x7x2.5 4x9x4 8x14x4 陶瓷 623 3x10x4mm Abec7 干式润滑油
Other Oil Field Equipments Drill Pipe Oil and Gas Well Casing Tube API 5CT J55, K55, N80q, L80, T95, P110, Q125, 13cr OCTG Casing Tubing and Drill Pipe with Btc, Nue, Eue, Premium/R3