06600003 – Square Key .25″ × 3.50″ × .25″ (Genuine OEM Ariens / Gravely Part) The 06600003 square key is a precision OEM replacement key used to lock rotating components — such as pulleys, gears, sheaves, sprockets, and couplings — onto a shaft to provide positive torque transfer. With dimensions of .25″ width × 3.50″ length × .25″ thickness, this square key is commonly found in transmission, drive, and deck spindle systems on Ariens and Gravely outdoor power equipment. Manufactured to Ariens and Gravely factory specifications, this key delivers exact fit, correct engagement, and long service life in demanding mowing and drive applications. Key Details Manufacturer Part Number: 06600003 Part Name: Square Key Brand: Ariens / Gravely Dimensions:• Width: .25″• Length: 3.50″• Thickness: .25″ Material: Hardened steel (factory spec) Part Type: Shaft key (square key) Function: Locks rotating components to shaft for torque transmission Installation: Direct OEM replacement Applications The 06600003 square key is used wherever a keyed shaft connection is required to transmit torque without slippage, including: Mower Deck Spindle Sheaves / Pulleys Transmission / Drive Shaft Sheaves Idler and Tensioner Assemblies Pump and Accessory Drives This key is commonly installed in the keyway of a shaft and the corresponding hub of the driven component to ensure positive mechanical engagement. Compatibility This Ariens / Gravely OEM key appears across multiple platforms and assemblies where a 1/4″ × 3.50″ key is specified, including: Zero-Turn Mowers — deck and transmission applications Stand-On & Walk-Behind Equipment — drive and accessory shafts Commercial & Residential Models — wherever this size key is specified in factory parts lists It spans multiple serial number ranges and supports correct torque transfer in PTO, idler, and spindle systems. Why Use Genuine OEM 06600003 Using a genuine OEM square key ensures: Accurate fit in the shaft keyway Proper torque transfer without slippage Correct material hardness for long service life Compatibility with factory sheaves, sprockets, and hubs This square key delivers factory-correct performance and reliability, making it the proper replacement for Ariens and Gravely mower and drive system applications.
