Sunday, December 04, 2016
Hat No: 170-9321


Big Brake Hats

Big Brake Hat - Flared Bell
Wilwood Big Brake Hat - Flared Bell Hat

Wilwood Big Brake Hat - Flared Bell Hat
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GT Series Big Brake Flared Bell hats are precision machined from premium aluminum alloys for high strength and attention to minimized weight. Hats in this category feature threaded rotor mount holes for use with standard through-hole mount rotors. Threaded hole hats may also be used with T-Nuts or b ...   Continue >>

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Product Number: 170-9321     Price: $170.58
Big Brake Hat - Flared Bell - Product Summary
Hat Dimensions
Mount Hole Type: Rotor Bolt Circle (in): Hat Offset (in): Center Reg. (in):
Threaded 12 x 7.00 2.02 2.67
Hat Type
Material: Mount Style: Finish: Weight (Lbs.):
Aluminum Fixed Mount Black E-Coat 2.3
Bolt Circle Dimensions
Hat Bolt Circle 1: Hat Bolt Circle 2: Hat Bolt Circle 3:
5 X 4.50 5 x 4.75
Application Info
Application Note: Hat Bolt Kit Part #:
Mustang 68-73 230-4572
Cautionary Info
Application Note:

Rotor Hat Applications
Driving EnvironmentVehicle Sub-TypesApplication Duty
Street Rods  Heavy Duty
Street Performance DomesticHeavy Duty
Street Performance ImportHeavy Duty
Road Race Heavy Duty
Off Road Heavy Duty

Rotor Hat Dimensions
Big Brake Hat - Flared Bell Hat Drawing

Big Brake Hat - Flared Bell Hat Drawing
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Additional Hat Dimensions
Rotor Mount Hole Size (in): 1/4-20
Shoe I.D. (in)
Clearance I.D. (in): 5.86
Face Thickness (in): 0.25
Hat Stud Diamenter - BC 1 (in): 0.52
Hat Stud Diamenter - BC 2 (in): 0.52
Hat Stud Diamenter - BC 3 (in):
Additional Notes:
Hat is drilled and countersunk in three places to accommodate hat to hub anchoring screws used with specific Wilwood hat mount hubs. Use 230-7032 (contains 6 qty. 1/4-20 x .50 Flat Head Hex Drive mounting screws)

Wilwood Compatible Rotors: Big Brake Hat - Flared Bell
GT 48 Curved Vane Rotor
Wilwood GT 48 Curved Vane Rotor

Wilwood GT 48 Curved Vane Rotor
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Rotor Dimensions
Rotor Diameter Range: Rotor Width Range:
13 1.1
GT-48 curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 48 Curved Vane Rotor
Wilwood GT 48 Curved Vane Rotor

Wilwood GT 48 Curved Vane Rotor
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Rotor Dimensions
Rotor Diameter Range: Rotor Width Range:
13 1.1
Wilwood's GT 48 Curved Vane Spec-37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Combined with our proven GT Series asymmetrical face slot pattern and individual dynamic balancing, you are assured the smoothest, vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 48 Curved Vane Rotor
Wilwood GT 48 Curved Vane Rotor

Wilwood GT 48 Curved Vane Rotor
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Rotor Dimensions
Rotor Diameter Range: Rotor Width Range:
12.6 1.29
Wilwood's GT 48 Curved Vane Spec-37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Combined with our proven GT Series asymmetrical face slot pattern and individual dynamic balancing, you are assured the smoothest, vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 48 Curved Vane Rotor
Wilwood GT 48 Curved Vane Rotor

Wilwood GT 48 Curved Vane Rotor
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Rotor Dimensions
Rotor Diameter Range: Rotor Width Range:
12.88 1.38
Wilwood's GT 48 Curved Vane Spec-37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Combined with our proven GT Series asymmetrical face slot pattern and individual dynamic balancing, you are assured the smoothest, vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
SRP Drilled Performance Rotor
Wilwood SRP Drilled Performance Rotor

Wilwood SRP Drilled Performance Rotor
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Rotor Dimensions
Rotor Diameter Range: Rotor Width Range:
12.44 13 1.1 1.19
SRP Drilled Performance Rotors feature a specially engineered directional cross drill and face slot pattern that improve brake response and pad performance throughout the entire range of light to heavy braking. The venting and cleaning action of the holes and slots will reduce pad glaze and disperse gasses and heat generated during the pad to rotor interface. The holes and slots also inhibit irregular pad compound build-up on the rotor faces resulting in smoother engagement and improved pedal response in all conditions. The material removed also contributes to lower rotating and unsprung suspension weight. View SRP Rotors