... per the Standard GB,JB,CB,ZB,JIS,ASTM,SAE,DIN or special requirements from Customers.1) Chain wheel, gear wheel, sheave ... Gear, axial seat, big shaft, block, module etc.(6) Fire grate car, carrier wheel, driving chain, chain wheel etc. for mine metallurgical engineering ... declared NK,DNV,BV,ABS,CCS,Germany classification society attestation. chain wheel