NB SM20AJ 20mm Slide Bush Ball Bushings Linear Motion Bearing 3/16 inch Cross Section Thin Bearings outer diameter is 47mm and

outer diameter is 47mm and width is 20mm

Part# 510003

Fits Specialized S-works Roubaix Bottom Bracket Bicycle

30304 outer diameter is 52mm and 30304 width is 16mm

and Bearing width is 39mm

NB SM20AJ 20mm Slide Bush Ball Bushings Linear Motion Bearing 3/16 inch Cross Section Thin Bearings outer diameter is 47mm andSM20AJ Type Clearance Adjustable: Slide Bush Made in Japan: NB Linear Systems Nippon Bearing Linear Systems SM20AJ Linear Slide Bush, bearing has clearance adjustable, bearing is a high accuracy grade linear bushings, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. SM20AJ Bearing Linear Slide Bush Shaft Diameter: 20mm Number of Ball Circuits: 5 Dynamic Load Rating Cr: 882 N Static Load Rating Cor: 1370 N