Wilwood Front Spindle-Mount Drag Hat, Five Threaded Rotor Connections

Five threaded rotor mounts and a 3.57-inch register identify this Wilwood spindle-mount drag hat. Match the hub and 1.000-inch offset. Disc brake system design and manufacturing are Wilwood Engineering’s focus. Bill Wood founded the Camarillo, California company in 1977; its range spans brake rotors, master cylinders, calipers, fittings, valves and brake lines for motorsport, specialized and street-performance applications. The choice of individual components depends on the complete brake system.

Technical Details

• Manufacturer part number: 170-0995
• Hat offset: 1.000 inch
• Rotor attachment interface: 5 x 5.00 inches; rotor attachment, separate from the hub flange
• Hub-flange mounting/clearance pattern(s): 5 x 4.75 inches; verify the actual hub and wheel-stud clearance
• Center register diameter: 3.57 inches
• Rotor mounting hole/thread designation: 3/8-16
• Mounting-face thickness: 0.22 inches
• Hub-side hole clearance diameter(s): 0.391 inches; these are clearance dimensions, not wheel-stud thread sizes
• Manufacturer-listed attachment hardware reference: 230-3829; verify the specific rotor and attachment arrangement before ordering hardware
• Component: Drag Brake Rotor Hat
• Material: Aluminum
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount
• Position in the specified brake assembly: Front

Fitment & Compatibility

The specified Spindle-mount drag brakes must use the same hat geometry and rotor interface. Verify the hub register and offset measurement reference before assembling the brake system. Select the rotor and attachment hardware separately for the documented assembly. Follow the installation drawing for engagement and clearance at every mounting point.

Manufacturer Reference

Wilwood component specifications and dimensions

Our team at PMB Performance has over 20 years of parts and fitment experience. The existing component number and brake-system details help us check the match.