Brand: Tilton Engineering
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These 5 1/2" clutch discs fit the Tilton OT-III Dual Disc Racing Clutch (Part No. 173-50). They will also fit 5.5" dual-disc racing clutches from Quarter Master and AP Racing.
This set of 2 sintered metallic "stacked" discs includes one disc with a standard ("A"-type) hub and one with a thin ("C"-type) hub for increased flywheel clearance. Note that the stresses on the thinner hub are much more concentrated over a smaller spline area. This could result in damaged splines on high-torque applications. 7/8"-20 spline pattern.
Tilton's minimum recommended clutch disc thickness is 0.089" on dual disc clutches. New clutch discs measure 0.104" thick.