Wilwood 230-6659 Wide 5 Adjustable Spindle Nut Self-Locking Assembly

The Wilwood 230-6659 is an adjustable spindle nut locking assembly engineered specifically for Wide 5 (W5) hub and spindle applications. Designed as a precision replacement and upgrade component for circle track and racing builds, this self-locking nut assembly secures the wheel hub on the spindle while allowing fine-tuning of bearing preload and end play.

The Wide 5 bolt pattern — a 5 x 10.25" lug configuration — is the standard in oval short track racing due to its superior ability to handle abuse and high lateral loads. Proper spindle nut retention is critical to keeping the hub securely located on the spindle under these demanding conditions.

Key Features:

• Adjustable design allows precise bearing preload and end play setting
• Self-locking mechanism prevents loosening under racing loads and vibration
• 2-5/8" hex for positive torque application
• Aluminum construction for lightweight performance
• Engineered specifically for Wide 5 spindle applications
• Manufactured by Wilwood Engineering to strict tolerances for high-performance reliability

Wilwood Engineering has been designing and manufacturing high-performance disc brake systems and related components since 1977, serving motorsports, industrial, military, and specialty vehicle markets. The 230-6659 spindle nut assembly is the correct replacement or upgrade part for Wilwood Wide 5 hub setups requiring a secure, adjustable spindle nut solution.