Drive Mandrel Stepped Steel Washer

The Drive Mandrel Stepped Steel Washer from MOROSO (MPN 97100) is a precision crank mandrel component engineered for engine builders and machine shops performing crankshaft work. This stepped steel washer serves as a critical support and spacing element during mandrel operations, helping protect crankshaft journals while ensuring proper alignment and load distribution during pressing, grinding, or assembly procedures. Professionals rely on quality mandrel washers to maintain accuracy and prevent costly damage to expensive crankshaft stock.

Manufactured from high-strength steel and finished in black oxide, this stepped design features a 1.002-inch inner diameter and 2.5-inch outer diameter, providing a stable interface between mandrel and workpiece. The stepped profile allows for controlled bearing contact and load spreading, while the black oxide finish resists corrosion and provides improved visibility of wear patterns. At just 0.4 lbs, it remains practical for frequent handling without contributing unnecessary weight to mandrel assemblies, yet delivers the durability required in professional machine shop environments.

Machine shops, performance engine builders, and crankshaft specialists routinely stock MOROSO mandrel washers as essential consumables for high-volume or precision work. The stepped design accommodates varying journal sizes and bearing configurations, making it compatible with most standard crank mandrel setups. Installation is straightforward—position the washer on the mandrel shaft before mounting the workpiece, ensuring the stepped shoulder aligns with your specific journal diameter for optimal load transfer and protection throughout the machining process.