The 15020 is far more than a standard hardware-store washer. In a racing suspension, the A-arm shaft is subject to constant "pounding" and vibration. A standard washer can cup, crack, or allow the retaining nut to lose its torque. The JOES 15020 is engineered with the thickness and diameter necessary to provide a uniform clamping force across the face of the bushing or bearing, ensuring the pivot remains stable and centered.
Detailed Technical Specifications
1. High-Torque Load Distribution
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Over-Sized Face: Designed to cover the entire surface area of the pivot bushing or uniball housing. This prevents the "walking" of the A-arm along the shaft.
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Non-Compressible Steel: Machined from high-strength alloy steel that will not deform or "dish" even when torqued to the high levels required for safety-critical suspension components.
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Precision Bore: Features a tight-tolerance center hole to ensure the washer stays perfectly concentric with the shaft, preventing off-center loading.
2. Performance & Reliability
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Vibration Resistance: The mass and flatness of the 15020 help maintain consistent "pre-load" on the pivot assembly, reducing the chance of the retaining nut backing off during a long feature race.
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Universal Fitment: Optimized to work with JOES A-arm shafts and most standard aftermarket control arm pivots used in Circle Track and Road Racing.
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Corrosion Protection: Typically finished with a protective coating to resist the moisture, mud, and harsh cleaning chemicals found in the pits.
3. Critical Safety Link
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Bushing Containment: Acts as a mechanical stop to ensure that even if a bushing were to fail, the A-arm remains captured on the shaft.
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Professional Finish: Provides a clean, "factory" look to custom-fabricated suspension systems.
