Wilwood Front Outer Bearing Cone, A3, 0.844-Inch Nominal ID

This Wilwood outer tapered bearing cone belongs to the A3 arrangement in the designated front rotor-hub. Its nominal 0.844-inch spindle bore matches the size of another bearing family, but not that family's race geometry. Established in 1977 by Bill Wood, Wilwood Engineering is based in Camarillo, California. Its disc brake design and manufacturing work covers calipers, brake rotors, master cylinders, valves, fittings, and brake lines. Across motorsport, street-performance, and specialized applications, those components are specified as parts of a complete braking system rather than chosen in isolation.

Technical Details

• Manufacturer part number: 370-9542
• Bearing Material: Steel
• Finish: Bare
• Cone ID: 0.844 inch nominal; 0.8437-inch reference
• Bearing set: A3
• Reference: M12649
• Matching race: 370-9245
• Quantity: One outer cone

Fitment & Compatibility

Use race 370-9245 and confirm the A3 identification before fitting. Do not substitute the A34 cone solely on bore size; the required cups are different.

Manufacturer Documents

• Wilwood DS719 technical document
• Wilwood product information

Representative product-family image. Confirm the ordered bearing or kit using the part number and specifications.

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