Piston & Bearing 1.850in

The QUARTER MASTER Piston & Bearing 1.850in (model 731185) is a precision-engineered throwout bearing assembly designed for high-performance manual transmission clutch systems. Built for automotive enthusiasts and professional mechanics who demand reliability during gear changes, this component replaces worn factory bearings in clutch systems where consistent engagement and smooth disengagement are critical to vehicle performance and drivability.

This piston and bearing unit features QUARTER MASTER's Tri-Lite technology, which reduces rotating mass while maintaining structural integrity under repeated clutch cycling. The 1.850-inch bore diameter is engineered for specific clutch applications where OEM clearances and pressure plate geometry demand precise fitment. The lightweight design—weighing just 0.59 lbs—minimizes inertial load on the transmission input shaft, resulting in faster engagement response and reduced wear on synchronizers during shifting. The bearing assembly is manufactured to tight tolerances, ensuring smooth operation across the full range of clutch pressure and preventing chatter or premature failure during aggressive driving or track use.

Street drivers and competition mechanics alike rely on this bearing for vehicles equipped with QUARTER MASTER clutch systems or compatible throwout bearing applications requiring a 1.850-inch piston diameter. Whether upgrading from worn OEM components or installing a complete clutch package, this unit delivers the precision fit and durability needed for street driving, weekend track days, or sustained high-rpm operation. Always verify compatibility with your specific clutch model and transmission before installation to ensure proper sleeve engagement and pressure plate alignment.