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SW20-OP:Made in Japan:NB Linear Systems
Nippon Bearing Linear Systems
SW20-OP Bore linear motion ball bushings/bearings, the inner diameter(bore) is 1 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.
NB Systems SW20-OP 1 1/4" inch Ball Bushings Linear Motion :: Kit8067 :: Linear Bearing & Motion Systems