OT-Series metallic race clutches offer the low moment-of-inertia, high torque capacity and the reliability for the most demanding racing applications. These features have made metallic clutches the most common clutch type used in road racing and circle track racing. Metallic clutches are recommended solely for race track use.
Full-Circle / 6-rivet Metallic Clutch Discs
Standard disc that is suitable for most applications. Six friction pads provide maximum surface area for low wear rate and high heat capacity. Available for 7.25″ and 5.5″ clutches.
In the part number, these disc packs are designated by a “2” for 7.25″ clutches and a “9” for 5.5″ clutches. Examples: 64185-2-A-36 (7.25″ disc pack) 64140-9-A-36 (5.5″ disc pack)
Full-Circle / 8-rivet Metallic Clutch Discs
Same as Full-Circle/6-rivet disc except hubs are attached with 8-rivets on a larger BCD for additional attachment strength for the most demanding applications. Available for 7.25″ clutches.
In the part number, these disc packs are designated by a “4”. Example: 64185-4-V-36 (7.25″ disc pack)
4-Paddle Metallic Clutch Discs
Lower inertia than full-circle discs, but have a slightly higher wear rate. The smooth radius between the friction segments also lowers core plate stress caused by misalignment between the engine & transmission and/or engine harmonics, minimizing core plate cracking. 7.25″ discs feature an 8-rivet hub and 5.5″ discs feature a 6-rivet hub.
In the part number, these disc packs are designated by a “3”. Examples: 64185-3-V-36 (7.25″ disc pack) 64140-3-A-36 (5.5″ disc pack)