Bridgeport Kits Rockford Ball Screw
Rockford Ball Screw manufactures preloaded ball screw kits for Bridgeport standard Series 1 mills and Knee Mill clones. Bridgeport Retrofit Kits Offer Many Convenient Features: HighCapacity, LongLife: Each ball nut assembly of the Rockford preloaded unit has one circuit of 3 1/2 turns of ball bearings.