油封密封圈骨架38X52x8
密封圈钻机油封30x52x10
密封圈油封38x52x1238x54x10
耐高温氟胶油封骨架
钻机油封40x54x1038x52x12
滚针轴承K50X55X30AK52X57X12K60X68X25