Specification: Ф 15 mm-Ф 300 mm maximum length: no more than 10000 mm 1, material: 38 CrMoAl A nitriding process, surface hardness: HV acuity 900 nitriding depth: 0.5 0.8 mm 2, material: surface WC/Co whole spray welding, can improve the service life of the screw
