1, Type-catalogue; Correlative chain types T&C: 5*2.5mm, 6*2.8mm, 1/4"*1/8", 8*3mm, 3/8"*7/32", 1/2"*1/8", 1/2"*3/16", 1/2"*1/4"Roller7.75, 1/2"*1/4"Roller8.5, 11/2"*5/16", 5/8"*3/8", 3/4"*7/1", 1"*17.02mm, 1"1/4"*3/4", 1"1/2"*1", 1"3/4"*1", 1/4"2*1"1/4, 03/04/05B/06B/08B/10B/12B/16B/20B/24B/28B/32B 25/35/40/41/50/60/80/100/120/140/160/180/200/240

2, Material: 42CrMo, 20CrMnMo, 20Cr2Ni4, 35CrM 20CrMnTi and other high intensity alloy steel

3, procession: Cast/cutting circle steel>>>making center bore>>>making /rolling teeth>>> teeth induction hardness>>>precision treating >>>surface treating>>>inspection>>>packing>>>customers

4, Surface treating: Black(oxide black/phosphates black) thickness >0.3, zinc plated, painting, anode, hardness (teeth hardness, whole hardness) 35+65.