The Wilwood 230-8037 is a single 1/4-20 x 0.750" 12-point rotor bolt for attaching a brake rotor to its hat or hub. Wilwood's 12 Point Bolts are offered in high strength alloy or stainless steel, and plating methods vary by application. The manufacturer's data lists an 18-8 stainless grade, a 12-point head, and a lock-wire drilled design. That drilled head is the main reason to pay more than generic hardware store fasteners. On a track car, where rotors heat up and get removed often, a stainless bolt you can safety-wire helps keep the hat-to-rotor joint from loosening. Owners on user forums have reported bolts backing out of the hat until one contacted the backing plate. Wire-locking addresses that failure mode. Search terms this matches include 1/4-20 12 point rotor bolt, Wilwood hat to rotor bolt, lock wire drilled stainless rotor hardware, and aluminum hat rotor bolts.
Wilwood's rotor-and-hat parts lists include this bolt, with the kit parts list showing 24 pieces in one assembly, so confirm the quantity for your kit. The manufacturer's install sheet for one hat-and-rotor kit says to coat the threads with red Loctite 271 and torque the bolts to 155 in-lb in a criss-cross pattern. Its Jeep JK sheet specifies 140 in-lb and safety wire. Because torque values differ between kits and some user forum posters report no thread locker at all, check the torque spec for your specific kit with the manufacturer before assembly.
The manufacturer's hat-and-rotor kit parts list includes part 230-8037 as a 1/4-20 x .75" 12-point bolt, so it is used in Wilwood rotor-to-hat assemblies. Confirm the exact quantity and fastener for your kit with the manufacturer.
The manufacturer's install sheet for its Jeep JK hat-and-rotor kit states that the bolts must be safety wired using 0.032 inch stainless safety wire. The bolt is also drilled for lock wire.
The manufacturer's install sheets give different values by kit, including 140 in-lb and 155 in-lb. Details vary, so confirm the torque for your kit with the manufacturer.
Rotor-to-hat fastening is a moderate DIY job that needs an inch-pound torque wrench, a 12-point driver, and safety wire if your kit calls for it. The manufacturer's install sheets say to apply red Loctite 271 to the threads and tighten in a criss-cross pattern. Before torquing, check that the hat seats flush against the hub. The manufacturer warns that a poor seat can cause excessive rotor runout. Owners on user forums warn that a bolt can snap when overtightened, so use an inch-pound torque wrench and avoid guessing. Forum advice on thread locker varies, so follow the manufacturer's spec for your kit.
