... : nature,black,blue,yellow3)advanced heat treatment process, mesh belt conveyor furnace use4)standard:ISO/ DIN /ANSI5)pre stretch and anti fatigue ... ,415H,420,420H,428,428H,520,520H,6303)short pitch conveyor roller chain attachments:A-1,A-2.K-1,K ... ,SA-2,SK-A,SK-24)double pitch transmissions v& conveyor chains :2040,2042,2050,2052,2060,2062,2080,2082 and ...