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SW48-OP:Made in Japan:NB Linear Systems
Nippon Bearing Linear Systems
SW48-OP Bore linear motion ball bushings/bearings, the inner diameter(bore) is 3" inch dimensions with steel retainer, bearing is a high accuracy grade linear bushings, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan.
NB Systems SW48-OP 3" inch Ball Bushings Linear Motion :: Kit8071 :: NB Bearing