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SWK4:Made in Japan:NB Linear Systems
Square Flange Type
Nippon Bearing Linear Systems
SWK4 1/4" Bore linear motion ball bushings/bearings, the inner diameter(bore) is 1/4" 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.
[BO] NB SWK4 1/4" inch Ball Bushings Square Flange Linear Motion :: Kit8094 :: NB Bearing