For concentric grip on the shaft and less vibration at higher speeds, specify Dodge D-LOK normal- or medium-duty mounted ball bearings. These unique, concentric collar bearings are engineered with attributes that assure you superior holding power with improved concentricity. Even at high speeds, the D-LOK bearing grips the shaft tighter and more uniformly for less vibration. Dodge Pillow Block Ball Bearing Unit, Medium Duty Non-Expansion Single Lip, Series: 212, 2-1/4 in Bore Dia, 6.88 to 7.94 in Bolt Center-to-Center Length, 2-3/4 in Base to Bore Centerline, 9-1/2 in Overall Length, 2.38 in Overall Width, 5.4 in Overall Height, Two-Bolt Base Mount, Round Bore Type, 2.37 in Base Width, D-LOK Concentric Clamp Collar Locking Device, Single Lip Seal, Non-Expansion Expansion Type, 11791 lb Dynamic/8100 lb Static, 225 to 400 deg F, 3500 rpm Maximum, Steel, Powder Coated Precision-hardened and honed inner and outer ringsNew rugged housing designNormal duty wide inner ringD-LOK locking mechanismDual guard positive contact seal including rubberized flingersStronger and flexible ball retainerSimplified anti-rotation deviceElectrostatically applied epoxy paint