... Material: Gcr15-China, (AISI) 52100-USA, (DIN) 100CR6-Germany3. Sealing cover: Z, ZZ, RS, 2RS, RZ, ZNR, etc.4. ... application: motorcycle, motor, pump, sewing machine, textile machine, agriculture machinery, electric, tools, etc.7. Packing: individual box single plastic bag ... airplane,main shaft of machine tool and other main shafts of high speed and precision machinery. It is also used on high ...