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| Lightweight Steel Spools |
Standard Steel Spools |
Aluminum & Titanium Spools |
| Masterline Spools |
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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.
Notes:
(1) 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.
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| 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. |
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| Lightweight Steel Spools |
Standard Steel Spools |
Aluminum & Titanium Spools |
| Masterline Spools |
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