Wilwood Grand National III 6 Piston Caliper

Wilwood Grand National III 6 Piston Caliper

Your Price:$356.95
Part Number:WIL-120-6478

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The Wilwood Grand National III 6 Piston Caliper is a time-proven caliper that has been widely used with 5 on 5 hubs for stock car, road course, and off-road competition. The 3.50" mount configuration (also available in 6.00” mount) incorporates this legacy of enduring performance, with options available for the latest brake system heat management technology. 

3.50" mount with taller height for 12.19" rotors. The new generation GN lll uses the same popular 3.50" mounting pattern found on the Superlite caliper series, but are built with a taller mounting height. This feature accommodates the installation of 12.19" diameter rotors on the same spindle brackets used with a Superlite caliper and 11.75" diameter rotor. The GN lll can be run with either a 1.25" or 1.38" thick rotor. This makes it possible to run three different bolt-on brake setups, without the need for bracket changes on the spindle.   

High strength, low deflection, and superior stopping power. Each GN lll is manufactured from a precision casting using a tight grained, high-density aircraft alloy. It is a two-piece, closed bridge design with grade 8 thru-bolts and external stiffening ribs. The GN lll utilizes a unique six-piston configuration that generates high clamping force with balanced loading for extremely even pad wear. The 1.75" / 1.38" / 1.38" bore pattern contains a total of 5.44 square inches of effective piston clamp area. This makes the GN lll one of the largest calipers available, with weights starting at 5.94 pounds. The caliper bridges are fitted with stainless steel plates to reduce wear and provide smooth pad operation. Dual center bridge bolts add to the overall caliper strength and provide positive retention for the top loaded pads. Dollar for dollar, this combination is unmatched for high strength, low deflection, and superior stopping power.

Product Specifications

Rotor Compatibility
- Rotor Width(In):     1.38
- Maximum Rotor Width(In):     1.38
- Minimum Rotor Width(In):     1.25
- Maximum Rotor Diameter(In):     13.06
- Minimum Rotor Diameter(In):     12.19

Brake Pad Specifications
- Brake Pad Type 1:     7520
- Brake Pad Type 2:     N-A
- Brake Pad Type 3:     N-A
- Total Pad Area (in²):     11.1
- Total Pad Volume (in³):     6.9

Mounting Specifications
- Mount Type:     Lug
- Mount Center(In):     3.5
- Mount Hole Size(In):     0.45
- Mount Height(In):     3.07
- Inlet Thread Size:     1/8-27 NPT

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