NB SM30 30mm Slide Bush Ball Bushings Linear Motion Bearing Inner Diameter - 1 7/16 inch (1.4375") the 6908XBNLS inner diameter is

the 6908XBNLS inner diameter is 40mm

the 21317EXW33K inner diameter is 85mm

5mm Shielded Ball Bearings

the 6915ZZ outer diameter is 105mm

Oil Lubrication Ball Bearings

NB SM30 30mm Slide Bush Ball Bushings Linear Motion Bearing Inner Diameter - 1 7/16 inch (1.4375") the 6908XBNLS inner diameter isSM30 Slide Bush Made in Japan: NB Linear Systems Nippon Bearing Linear Systems 30mm Linear Slide Bush, bearing is a high accuracy grade linear bushings,series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. SM30 Bearing Linear Slide Bush Number of Ball Circuits: 6 Quantity: 1 Bearing Dynamic load rating Cr: 1,570 N Static load rating Cor: 2,740 N Major dimensions Eccentricity radial clearance dr D L B W D1 Precision