Key Stock - 1/4 x 1/4 x 2-7/8

The Key Stock - 1/4 x 1/4 x 2-7/8 from ATI Performance is a precision-engineered fastening component designed for serious engine builders and transmission specialists who demand reliability in high-performance automotive applications. This small but critical stock serves as a locating and retention element in drivetrain assemblies, securing components that transmit power and torque through your vehicle's mechanical systems. Whether you're rebuilding a race engine, upgrading a transmission, or performing critical engine bay modifications, having OEM-quality key stock on hand ensures your work meets professional standards.

Manufactured to strict tolerances by ATI Performance, this key stock features 1/4-inch width and height dimensions with a 2-7/8-inch length, making it ideal for securing pulleys, gears, and shaft assemblies against rotational slip. The rectangular profile seats precisely into corresponding keyways, preventing circumferential movement while maintaining alignment under extreme load and vibration. ATI Performance's commitment to dimensional accuracy ensures zero play and consistent performance across thousands of engine cycles, whether in naturally aspirated, supercharged, or turbocharged applications. The compact 0.06-pound weight makes this component ideal for weight-conscious builds without sacrificing structural integrity.

Professional mechanics and dedicated enthusiasts building stroker engines, installing aftermarket crankshafts, or upgrading transmission internals will appreciate this essential fastening solution. Installation requires precise keyway alignment—slide the key stock into the shaft keyway first, then seat the pulley or gear component over it to ensure full engagement. This component is compatible with any engine platform using standard 1/4-inch keyways, including small-block and big-block Chevrolet, Ford, and Mopar applications. Keep multiple units on hand for engine builds, as losing a single key stock during assembly can compromise your entire project and introduce costly vibration and wear patterns.