Wilwood 120-15777 FNSL6R Radial Mount Brake Caliper, Left, 6-Piston

Forged Narrow Superlite 6R Radial Mount Caliper

The Forged Narrow Superlite 6R (FNSL6R) is our newest version of the venerable Superlite caliper series. It adds the versatility and convenience of radial mounting to this popular caliper group. Radial mounting simplifies adaption and provides two planes of adjustment for precise alignment over the rotor. These calipers integrate big brake style with Wilwood’s latest technology for generating big stopping power in extreme environments and across a wide range of vehicle applications.

The key to FNSL6R’s superior performance is its extremely durable and efficient body design. Weighing in at an initial 4.9 pounds, it is the result of computer generated solid modeling and FEA stress analysis technology.

The most significant feature of this new caliper design is the forging. Each body is stress-flow forged in a process from premium grade aluminum alloy billets. This process realigns the metal’s internal grain structure to flow with the contour of the caliper body. This process eliminates the stresses and interruptions to the internal grain structure that occur when machining a straight block. In short, there is no better way to build a stronger aluminum caliper body. A unique differential bore six-piston configuration provides balanced loading for sustained high heat pad wear. Standard FNSL6R calipers feature one-piece stainless steel pistons. Stainless is used for its low heat transfer properties and high resistance to corrosion. Calipers can be upgraded with Wilwood’s proprietary Thermlock pistons. This multi-piece piston design creates a highly efficient thermal barrier to further reduce heat transfer from the pads into the caliper body, seals, and fluid. Cooler temperatures translate to longer service life and reduced chances of pedal fade due to heat. class="Gray11B">Thermlock Dust Boot No

Rotor Dimensions

Rotor Width (in)	1.25
Rotor Diameter (in)	14.00

Pad Dimensions

Pad Area (in²)	8.2
Pad Volume (in³)	3.8

Service Rating & Material

Material	Forged Aluminum
Weight (lbs)	4.9

Colors & Finish

Color	Anodized
Finish	Type III Anodized

Mounting

Mount Center (in)	5.98
Mounting Position
Mount Side	Left
Mount Type	Radial

Specifications

Rotor Compatibility

Rotor Width (in)	1.25
Max Rotor Width (in)	1.25
Min Rotor Width (in)	1.19
Max Rotor Diameter (in)
Min Rotor Diameter (in)	11.75

Brake Pad Specifications

Brake Pad Type 1	7416
Brake Pad Type 2	N-A
Brake Pad Type 3	N-A
Total Pad Area (in²)	8.2
Total Pad Volume (in³)	3.8
Mounting

Piston

Piston Specifications Piston Bore 3 (in)

Piston Bore 1 (in)	1.75
Piston Bore 2 (in)	1.25
1.25
Total Piston Area (in²)	4.86

Mounting Specifications

Mount Type	Radial
Mount Side	Left
Mount Center (in)	5.98
Mount Hole Size (in)	0.39	Mount Height (in)	1.45	Inlet Thread Size	1/8-27 NPT