Wilwood Front Rotor Hat for Five-on-4.72-Inch Flanges, 1.000-Inch Offset

This Wilwood front hat uses a 1.000-inch offset and 5 x 4.72-inch hub flange. Check the 3.06-inch register and separate rotor fasteners. Camarillo, California is home to Wilwood Engineering, founded by Bill Wood in 1977. Wilwood designs and manufactures disc brake systems, with calipers, brake rotors, master cylinders, fittings, valves and lines serving motorsport, street-performance and specialized uses. Select individual parts to meet the needs of the complete brake system.

Technical Details

• Manufacturer part number: 170-12940
• Position in the specified brake assembly: Front
• Hat offset: 1.000 inch
• Rotor attachment interface: 12 x 8.75 inches; rotor attachment, separate from the hub flange
• Hub-flange mounting/clearance pattern(s): 5 x 4.72 inches; verify the actual hub and wheel-stud clearance
• Center register diameter: 3.06 inches
• Rotor mounting hole/thread designation: 1/4-20
• Internal clearance diameter: 7.09 inches
• Mounting-face thickness: 0.25 inches
• Hub-side hole clearance diameter(s): 0.630 inches; these are clearance dimensions, not wheel-stud thread sizes
• Manufacturer-listed attachment hardware reference: 230-8008; verify the specific rotor and attachment arrangement before ordering hardware
• Manufacturer installation note: 3.06 " diameter register with counterbore for register ring.
• Component: Flared-Bell Brake Rotor Hat
• Material: Aluminum
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount

Fitment & Compatibility

Check the five-on-4.72-inch hub flange against the actual front conversion. The hat places a twelve-bolt rotor at 1.000-inch offset and centers on the specified 3.06-inch register. Its flared bell and 0.25-inch face are part of the mounting stack. Obtain the rotor hardware required for that assembly before installation.

Manufacturer Reference

Wilwood component specifications and dimensions

For fitment assistance backed by more than 20 years of experience, share the installed brake configuration with PMB Performance before ordering.