Product Description Product Standard Double Pitch Roller chain Material 40Mn steel,304 stainless steel, 316 stainless steel and 201 stainless steel. Types Standard chains and special chains, such as A or B series chains, roller chains, driving chains, conveyor chains, hoisting chains, agricultural chains, sprockets, gears, wheels and so on. Series  A series(12.7-50.8mm pitches),B series (9.525-50.8mm…