... &timely delivery 3>30 years experience in well drilling equipments Specification: Size8 1/2”(215.9mm)IADC127GBearing TypeElastomer sealed journal bearingThread ... ,435, 417,437515,525,535,545, 517,527,537,547615,625,635,,617,627,637,737512,522,532,612,622,632 ...