Sourcing New Ball Screw Manufacturers

In creating a manufacturers list using Global Spec, selecting the product "Ball Screws" and selecting "Company Type = Manufacturer" provides a listing of 111 companies. Upon further investigation of the companies, fewer than 30 were actually manufacturers of ball screws... reason being that selecting Manufacturing and Ball Screws includes those that offer ball screws and are classified as a manufacturer (whether a manufacturer of ball screws and/or anything else).In order to ensure multiple sources, I was looking at DIN standard nuts. While the DIN standard controls the envelope and mounting dimensions, and I expected some variance in the load rating due to differences in ball conformity, manufacturing, and materials, load ratings varied by almost 2x for the same-size DIN standard nut.Upon obtaining quotes from manufacturers that meet basic qualification criteria (legal US sales representation, ISO registration, and minimum factory warrantee), price points varied by almost 5x. Some major manufacturers quoted their non-standard nut at much more competitive prices.