-extra Quality- Starters Orders 4 Crack And Key Guide

| Specification | Minimum Required | |---------------|------------------| | Pinion gear hardness | 55–60 HRC (case depth ≥0.030″) | | Keyway tolerance | H7 fit or better | | Engagement cycle rating | ≥50,000 cycles at rated torque | | OEM cross-reference | Verifiable engineering drawing |