Special Standard (ISO) 12B (3/4"X7/16") - Z < 20
Special Standard sprockets have induction hardened teeth (45 ÷ 55 HRC) and keyway located on the centerline of tooth.
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- Ø < 30 (46)
- Ø = 30 ÷ 40 (41)
- Ø > 40 (6)