Hourglass Spacers 1/2in IDx1-1/2in OD x 1in Long

The ALLSTAR PERFORMANCE Hourglass Spacer 1/2in IDx1-1/2in OD x 1in Long (SKU ALL 18834) is a precision aluminum spacer designed for engine and drivetrain assembly applications where accurate bore alignment and controlled spacing are critical. These hourglass spacers provide consistent axial positioning in high-tolerance automotive builds, from street performance engines to competition drag racing applications where exact clearances between rotating components determine reliability and peak efficiency.

The 0.5-inch inner diameter accommodates standard fastener sizing, while the 1.5-inch outer diameter establishes a wider bearing surface that distributes load across larger component areas. At exactly 1 inch in thickness, this spacer maintains the dimensional precision required in crankshaft support rings, pump mounting plates, and balancer installations where even slight misalignment can introduce vibration or premature wear. The natural aluminum finish offers corrosion resistance suitable for both street and track environments, and the hourglass profile—wider at the ends with a necked-down center—maximizes structural rigidity while minimizing weight. Supplied as a pair, these spacers are ready for immediate installation without additional machining or preparation.

These ALLSTAR hourglass spacers serve builders, shops, and enthusiasts assembling small-block and big-block engines, Chevy, Ford, Mopar, and other platforms where OEM or aftermarket specifications call for precision spacing components. The pair format reduces purchase complexity for common dual-spacer applications. This is an essential hardware component for anyone restoring vintage performance engines, building competition powerplants, or performing detailed machine work where bore concentricity and proper component clearance are non-negotiable.