Wilwood Front Rotor Hat with 5 x 3.93/4.50-Inch Flange Patterns

The Wilwood front hat has 5 x 3.93 and 5 x 4.50-inch flange patterns. Match 0.950-inch offset and the twelve-bolt rotor assembly. Bill Wood established Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and builds disc brake systems for motorsport, street-performance and specialized uses, including calipers, rotors, master cylinders, valves, fittings and brake lines. Each part must match the requirements of the whole braking arrangement.

Technical Details

• Manufacturer part number: 170-13970
• Mounting-face thickness: 0.27 inches
• Hub-side hole clearance diameter(s): 0.520 inches; these are clearance dimensions, not wheel-stud thread sizes
• 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
• Position in the specified brake assembly: Front
• Hat offset: 0.950 inch
• Rotor attachment interface: 12 x 8.75 inches; rotor attachment, separate from the hub flange
• Hub-flange mounting/clearance pattern(s): 5 x 3.93, 5 x 4.50 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: 7.40 inches

Fitment & Compatibility

Identify the installed brake conversion before choosing this hat for Matched dual-pattern brake conversions. The offset, center register and attachment hardware must agree with the rotor and hub in that assembly. 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

Ask PMB Performance for help comparing the installation requirements. We have more than 20 years of experience working with brake parts and fitment.