... quality and long life time Item No: crown &pinion (mid) 99012340251 with ratio 17-28A: Features1) Material: Steel(20CrMo ... , 20CrMoTi, 42#,45#,ZF7B)2) Processing: Forging, Maching(Shapping, Hobbing), Heat Treatment, Annealing, ... TS/16949, ISO9001:2002 Certificate. DIN standard is available.2) Prompt delivery.3) Competitive price4) Small order accept5) Customer ...