The Wilwood Rotor-UL32 Vented Iron-Drilled 12.19 x .810 - 8 on 7.00in (MPN 160-5865) is a 12.19-inch, .810-inch-thick vented iron rotor with a drilled face, built for an 8-on-7.00-inch bolt circle. Because Wilwood's own hat-mounted rotors are assembled with separate hardware, confirm the hub pattern and hat before ordering. For buyers who lack track time for bedding in new pads and rotors, Wilwood offers factory dyno-bedded pads and rotors, which removes a common hurdle. Searching for a 12.19 inch vented iron rotor, an 8x7 drilled brake rotor, or a UL32 Wilwood upgrade should lead you to this part's specs.
Choose this over a generic rotor when you need a large-diameter iron disc that is designed around Wilwood's hat-and-rotor system, not a loose casting. The manufacturer's hat-mounted assembly sheet specifies red Loctite 271 on the bolt threads and torque in a criss-cross pattern, and the bolts may be safety wired using standard 0.032 inch diameter stainless steel safety wire for added security. Those documented steps give DIY installers a repeatable, track-grade attachment method that cheaper rotors rarely document.
Installation is a hub-level job. The hat must fit flush against the hub face or excessive rotor run out may result, so clean the mating surfaces before final assembly. Use three lug nuts, finger tight, to keep the hat and rotor in place while you check alignment. Then view the rotor through the top opening of the caliper; the rotor should be centered in the caliper.
The manufacturer's hat-and-rotor assembly sheet calls for red Loctite 271 on the bolt threads, with the bolts torqued in a criss-cross pattern to 155 in-lb. Torque differs between Wilwood kits, so follow the value on the instructions supplied with your hat.
The manufacturer says the bolts may be safety wired with standard 0.032-inch stainless steel wire for added security, and it refers to a separate safety-wire data sheet for the full procedure.
Plan on a hub-level installation with a torque wrench, red Loctite 271, and a lug nut set to hold the hat and rotor in place. Before final torque, make sure the hat seats flush against the hub, and then check that the caliper is centered over the rotor. Following the manufacturer's assembly sheet for the specific hat avoids the most common runout problem.
