Fitment questions?
Call (855) 786-7101 or text (801) 304-3141.
Real people. Real answers.
Product details
This rotor-to-hat kit supplies eight Grade 8 socket-head bolts and washers for the specified GT, SS and GTL mounting arrangements. The one-inch 5/16-18 bolts are lock-wire drilled, and their taller heads require sufficient clearance in the assembled brake. The manufacturer is Wilwood Engineering, founded by Bill Wood in 1977 and based in Camarillo, California. Wilwood designs and manufactures disc brake systems and components for street-performance, specialized applications and motorsport. Its master cylinders, calipers, rotors, brake lines, valves and fittings must be chosen to work together within the complete system.
Technical Details
- Manufacturer part number: 230-2589
- Component quantity: 8 bolts
- Material: Alloy Steel
- Grade: Grade 8
- Head form: Socket Head
- Drive: Hex Drive
- Listed fastener length: 1.000 in
- Thread: 5/16-18
- Washer type: Flat
- Safety-wire drilling: Yes
- Finish: Black Oxide
Fitment & Compatibility
Wilwood's hat guidance permits this socket-head kit only where bolt-head clearance exists. For assemblies requiring the short-profile drag bolts, use the specified hardware instead; verify rotor thickness, thread depth and surrounding clearances before assembly.
Wilwood product specifications · Wilwood hat hardware and bolt-head clearance guidance
Bring the original assembly number and relevant measurements to PMB Performance for fitment assistance backed by 20+ years of experience.
