... . quality: ISO 5,6,7 about the products:1.The worm shft material can be 40Cr, 45#, 42CrMo etc.or according ... to the customer's requirements 2. The worm wheel material can be Brass, CuSn12Ni, QAL10-4,QA15, PA46 ... hardening, Quench and temper, Medium and high frequency.4. The worm gear are widely use in engineer machine and ...