CNC machining parts brass nut Material: brass , stainless steel Finish: Zinc, nickel plating free ... precision parts: valve accessory, brass tube fittings, elbow, tee, nut; Auto-lathe turning precision part: precision electronic parts, fasteners, and ... etc(4) Main inspection devices: digital projector, Rockwell hardness tester, hydraulic valve test bench, micrometer, thread ring gauge and plug gauge ...