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Spools by Mark Williams

Lightweight Steel Spools Standard Steel Spools Aluminum & Titanium Spools
Masterline Spools    
Steel Spools by Mark Williams

All Mark Williams steel spools are precision machined from 4140 steel forgings on CNC machinery to ensure accuracy. The ring gear register and bearing diameters are precision ground with the spool mounted on a special arbor to assure concentricity between the splines and the ground surfaces. The final grinding operation also ensures zero runout on the ring mounting surface. Engineered for maximum reliability, MW spools also have an increased cross-section under the ring gear register to prevent ring gear deflection. MW spools are heat treated in-house with the same austemper through hardening heat treat process as MW’s “Hi-Torque” axles. Mark Williams steel spools are offered in both standard and lightweight versions. The major differences are the addition of lightening holes drilled through the hub of the spool and a profile milled ring gear flange. This reduces the weight by as much as 25% over the standard version without sacrificing the strength of the spool.

G.M. applications require C-Clip eliminator or other axle retention method.
(2) 40 spline spools require 45 mm bore wheel bearing and matching housing ends.
(3) 35 spline spools require wheel bearings and housing ends that utilize with 1.531 or larger bore.

Aluminum Spools by Mark Williams

In the never ending battle to reduce rotating weight, Mark Williams offers spools manufactured from aluminum and titanium. MW’s aluminum spools are successfully being used in Pro Stock, Comp, Super Comp, Super Gas and Stock eliminator cars. They are machined from 7075-T6 aluminum alloy forgings and hard coat anodized for durability. Aluminum spools are approximately half the weight of the profile milled steel spools. 35 spline aluminum spools are currently available for 9” Ford, 8 3/4” Mopar and Chevy 12 bolt rears. 40 spline spools are available for 9” Fords as well as Dana 60 rears. 28 and 31 spline aluminum 9” Ford spools are also available but recommended only for oval track racing. A 9” Ford 40 spline titanium spool for high horsepower applications is also available by special order. Aluminum 9” Ford 40 spline spools must be used in a case with a 3.812” bore while the 35 spline aluminum 9” Ford spool requires a case with a 3.250” bore. 9” Ford 40 spline steel spools are available for 3.25 and 3.812” bore cases.
Lightweight Steel Spools Standard Steel Spools Aluminum & Titanium Spools
Masterline Spools