Barnes Industries, Inc.

New Barnes ball screws are a high load-carrying capacity, long wear life, single or double-nut design with external or internal ball return systems and felt or nylon seals in the nut assembly. The ball leadscrew is SAE 6150 steel, induction-hardened to a minimum hardness of 58Rc to required case depth. The nuts are aircraft quality SAE 8620 steel, also hardened to minimum hardness of 58Rc . The hardened and ground balls, Grade 25 or better, are either 52100 or 440C stainless steel. The return tubes are SAE 4130 steel heat-treated to 63-66 Ra hardness. Deflectors are 17-4 PH stainless steel with a maximum hardness of 40Rc.

Fig. 23 - Double nut - External return system.

Fig. 24 - Double nut - Internal return system.

Fig. 25 - Integral preloaded housing mounted unit.

For those manufacturers requiring acme screws "Barnes" has the engineering know how, skilled machinists and equipment to build both precision ground and thread milled Acme Screws of any size

Fig. 26 - Thread grinding an 8" dia. x 32 ft. long Acme Screw.

Fig. 27 - Thread milling a 6" dia. x 26 ft. long Acme Screw.