Suitable for Audi clutch hub assembly - Audi ZF 8HP55A six-piece castings
Key Features:
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Material: High-strength cast steel/aluminum alloy for thermal stability
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Design: Precision-machined splines for 6 friction plate engagement
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Function: Direct clutch pack force transmission in 3rd/5th/7th gears
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Critical Specs:
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142-148mm OD with 72±0.02µm surface finish
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Heat-treated to 58-62 HRC
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Failure Modes:
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Spline wear (>0.15mm play)
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Heat checking at >250°C
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Microfractures in casting voids
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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).



Audi clutch hub assembly
,ZF 8HP55A clutch assembly
,Audi transmission castings
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