external ball screw Keywords: external ball screw/single ball screww/nsk ball screw Manufacturing Process: Milled Thread Place of Origin: NINGBO Brand Name: COWELL The conventional type of ballnut of the external circulation ballscrews ,using return tube circulation system, Offers better solution and quality for general lead or large diameter ball screws. Features 1.Optimized design for high reliability 2.Strengthen durability 3.Extended lubricant life cycle