Suitable for Audi clutch hub assembly - Audi ZF 8HP55A six-piece castings

Key Features:

1. Material: High-strength cast steel/aluminum alloy for thermal stability

2. Design: Precision-machined splines for 6 friction plate engagement

3. Function: Direct clutch pack force transmission in 3rd/5th/7th gears

4. Critical Specs:

   • 142-148mm OD with 72±0.02µm surface finish

   • Heat-treated to 58-62 HRC

5. Failure Modes:

   • Spline wear (>0.15mm play)

   • Heat checking at >250°C

   • Microfractures in casting voids

Performance Note: Upgraded from 8HP45 with 20% increased torque capacity (550Nm) through reinforced ribbing. Requires ZF Lifeguard8 fluid for proper plate clearance (0.4-0.6mm).