gearbox spur gear ring material: AISI4140, 34CrNiMo6, 40CrNiMoA Dia: 1860mm Modulus: 24 Weight: 2300kg we manufacture spur gear ringthe material can be: AISI4140, AISI1025, 1035, 1045 ... lines of standard bearing, special bearings, gear, large gear, sprocket, tire, hollow shaft and many other heat treatment products. Big Gear Ring Used For Gearbox