| http://www.w3.org/ns/prov#value | - TK20 NB 20mm Bore Standard TopBall type linear motion ball bushings bearings, inner diameter(bore) is 20mm dimensions with built-in seals, the Topball slide bush is a high performance bushing with three times the load capacity, capable of providing up to 27 times normal travel life of a conventional slide bushing, high accuracy grade linear bushings, series mainly used in the USA, NB brand (Nippon
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