SM50UU-P Type Seals on Both Sides: Slide Bush Made in Japan:NB Linear Systems Nippon Bearing Linear Systems. SM50UU-P Linear Slide Bush, bearing is Seals on Both Sides, bearing is a Precision accuracy grade linear bushings, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Number of Ball Circuits: 6.The item "SM50UU-P 50mm Slide Bush Ball Linear Miniature Motion Bearings 19719" is in sale since Friday, December 6, 2013. This item is in the category "Business & Industrial\Automation, Motors & Drives\Mechanical Power Transmission\Bearings & Bushings\Other Bearings & Bushings". The seller is "irvineman" and is located in Anaheim, California. This item can be shipped worldwide.