... ,428H,520,530,630,25,25H3)short pitch conveyor roller chain attachments:A-1,A-2.K-1,K-2,SA ... -1,SA-2,SK-A,SK-2 etc4)double pitch transmissions v& conveyor chains :2040,2042,2050,2052,2060 ... series, 212A(2060) with attachment series,6)simplex,double,triplex chainsThe chain technic is as bellow1)shot peening2)bluing3)phosphating4)nickel-plated5 ...