Murray 21553ma Square Key 3/16 Inch

Product Description

The MURRAY 21553ma is a 3/16-inch square key used to secure rotating components to shafts in lawn and garden equipment. Square keys transmit torque between a shaft and a mating hub or pulley by fitting into matching keyways cut into both parts. This hardware fastener is a direct OEM replacement designed for Murray-branded outdoor power equipment. Installation is straightforward and is typically performed by small-engine technicians or experienced equipment mechanics during drivetrain or blade-engagement servicing.

This square key is intended for use in Murray lawn and garden equipment where a 3/16-inch keyway specification is required. Common applications include blade spindles, drive pulleys, and other shaft-mounted rotating assemblies found in residential walk-behind mowers and riding mowers. Always verify the keyway dimensions on the shaft and mating component before installation.

Key Features

• 3/16-inch square key profile fits standard keyway dimensions for Murray equipment
• OEM Murray replacement part ensures proper fit and function
• Transmits torque between shaft and hub to prevent component slippage
• Simple installation requiring basic hand tools

Compatibility

Designed as an OEM-style replacement square key for Murray lawn and garden equipment requiring a 3/16-inch square key specification.

Installation Notes

Disconnect the spark plug wire and ensure the equipment is powered off and on a stable surface before servicing any drivetrain components. Remove the relevant pulley or hub, seat the square key fully into the shaft keyway, then slide the mating component into alignment before securing with the retaining hardware. Inspect the keyway on both the shaft and hub for wear or deformation before installing a new key. This work is typically performed by small-engine mechanics or qualified equipment technicians.

Technical Specifications

• Key Size: 3/16 inches square
• Key Type: Square Key

Standard Information

• Brand: MURRAY
• Manufacturer Part Number: 21553ma