15990004 – Machine Key 5 mm x 5 mm x 25 mm (Square Key) The 15990004 Machine Key is a precision square machine key designed to secure rotating components such as pulleys, gears, sprockets, or couplings to a shaft. With dimensions of 5 mm x 5 mm x 25 mm, this key provides positive torque transfer and helps prevent slippage between the shaft and the mounted component. Manufactured to standard metric machine key specifications, this part delivers reliable fit, strength, and durability for mechanical drive and power transmission applications. Product Details Part Number: 15990004 Part Name: Machine Key (Square Key) Key Size: 5 mm x 5 mm x 25 mm Type: Square Machine Key Material: Hardened Steel Condition: New Function & Features Secures pulleys, gears, and couplings to shafts Provides positive torque transmission Precision-cut for accurate fit in metric keyways Hardened steel construction for strength and wear resistance Suitable for continuous-duty mechanical applications Applications The 15990004 Machine Key is used on select lawn mowers, outdoor power equipment, and mechanical drive systems requiring a 5 mm x 5 mm x 25 mm metric square key. Exact compatibility depends on shaft diameter and keyway dimensions. This standard metric square machine key is ideal for maintaining secure shaft-to-component connections and reliable power transmission in mechanical systems.
