The Wilwood 170-14095 is a GT Series Shallow Offset Drag hat, the aluminum mounting hat that carries a two-piece drag rotor on the wheel side. It is precision machined from aluminum alloy with a 1.38-inch offset, a 6 x 6.25 rotor bolt circle, and a 5 x 4.50 wheel stud pattern. Buyers searching for a 5x4.50 to 6x6.25 drag rotor hat, or a 1.38 offset aluminum drag hat, will find it built for fixed-mount rotors. Because the rotor is a separate piece, you can replace the friction ring without replacing the hat. The manufacturer positions the GT line for strength with minimized weight, and recommends pairing it with matched Wilwood rotor hardware for the most demanding conditions.
Fitment is the first thing to verify. The hat's wheel-side pattern and offset must suit your hub and wheel, and the rotor must match the 6 x 6.25 bolt circle. The manufacturer lists threaded rotor mounting holes for standard through-hole rotors, with T-nuts or bobbins as an option for slotted dynamic-mount rotors. Mount holes are 5/16-18, and the center registration is 3.06 inches with a counterbore for the register ring. Owners on user forums report that rotor bolts can back out after heavy track use, so use the correct thread-locker, torque to the manufacturer's value, and recheck bolts often. Search terms like Wilwood drag hat install, 6x6.25 rotor hat torque, and two-piece drag rotor hardware fit this part.
The manufacturer specifies threaded rotor mount holes for standard through-hole mount rotors. Threaded hats may also be used with T-nuts or bobbins designed for specially machined slotted-hole dynamic mount rotors.
The manufacturer lists hat bolt kit part number 230-12121 for this hat. Confirm the kit and quantity with the manufacturer before ordering, because rotor and hat hardware must match.
The manufacturer's listing does not confirm a specific vehicle application for this part number. Check the 6 x 6.25 rotor bolt circle, the 5 x 4.50 wheel stud pattern, and the 1.38 inch offset against your hub, wheel, and caliper, or confirm with the manufacturer.
This is a bench-assembly and hub-install job for a mechanic comfortable with brake work. Gather a torque wrench, high-temperature thread-locker, and the correct hat bolt kit. Before assembly, check that the hat's center bore clears the hub. Some owners on user forums have needed to open a hat's inner diameter slightly to slide it fully over the hub, and a hat that sits crooked can cause rotor runout. Seat the hat fully against the rotor, then torque the rotor-to-hat bolts to the manufacturer's value. Recheck the bolts after the first few heat cycles and before any track session.
