A-B11720463SM-AI KEY, HI-PRO, .250X2.5One New Aftermarket Replacement Hi Pro Key Fits Briggs & Fits Stratton Engines and Outdoor Power Equipment This Hi Pro machine key (part number 1720463SM) is a precision fit drive component used to secure gears, pulleys, and blade spindle assemblies to rotating shafts in Fits Briggs & Fits Stratton (B&S) engines and lawn and garden equipment. Hi Pro keys are designed to seat firmly in a shaft keyway, preventing slippage and maintaining reliable power
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