... ",9 7/8",12 1/4",17 1/2", etc. IADC Code:4-- Series, 5-- Series, 6-- Series,etc. Elastomer sealed ... 7/8",12 1/4",14 3/4",17 1/2", etc. IADC Code:4-- Series, 5-- Series, 6-- Series,etc. Air ... 7/8",10 5/8",12 1/4", etc. IADC Code:5-- Series,6-- Series,7-- Non-Sealed Roller Bearing ... ",3",3 5/8:",3 7/8",4",4 1/2",4 5/8",4 3/4",6",6 1/2",7 1/2",8 1 ... /2",9 1/2",9 5/8",9 7/8",12 1/4 ...