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Here is a Ball Screws & Actuators ball type lead screw with nut and flange. Print says the balls in nut are 440 C Stainless grade 2. The shaft on the one end is app. 375 or 3/8". The lead screw and nut are magnetic.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.