... well drilling equipments Specification: Size8 1/2”(215.9mm)IADC127GBearing TypeElastomer sealed journal bearingThread Connection4 1/2 reg pinWOB(KN/mm)0.3 ... 4 3/4”),127mm(5”)133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149.2mm( ... (6”),155.5mm(6 1/8”),158.7mm(6 1/4”), 165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5 ... 3/4”)381mm(15”),393.7m(15 1/2”),406.4mm(16”)444.5mm(17 1/2”),508mm(20”),558mm(22”),609.6mm( ...