... series(12.7-63.5mm pitches),B series (9.525-50.8mm pitches)2)motorcycle chains :415,415H,420, ... conveyor roller chain attachments:A-1,A-2.K-1,K-2,K-3,SA-1,SA-2,SK-A,SK-24)double ... pitch transmissions v& conveyor chains :2040,2042 ... , triplex chainsThe Chain technic treatment is as below:1.Shot peening2.Bluing3.Phosphating4.Nickel-plated5.Zincing6.Heat treatment7 ...