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The MILWAUKEE 40-50-0350 is a factory replacement lock out spring designed for use in Milwaukee power tools. This small but critical component maintains the lockout mechanism's function, preventing unintended tool activation when the trigger or switch is in the locked position. Licensed electricians, HVAC technicians, and other trade professionals rely on this type of OEM replacement part to restore full safety functionality to a tool without replacing the entire assembly. Sourcing the correct spring by part number ensures proper fitment and preserves the intended operation of the lockout system.
This lock out spring is an internal service part suited for technicians and tradespeople performing repairs or preventive maintenance on compatible Milwaukee power tools. It is typically installed during bench-level tool repair when the existing spring has lost tension, become deformed, or failed entirely. Because lockout springs are safety-critical components, replacement should be performed by individuals familiar with power tool disassembly and reassembly procedures.
Designed as an OEM-style replacement lock out spring for compatible Milwaukee power tools. Verify the part number against your tool's service diagram or parts list before ordering to confirm fitment.
Installation should be performed by a qualified technician familiar with power tool repair procedures. Disconnect the tool from any power source and remove the battery pack before beginning disassembly. Refer to the Milwaukee service manual or exploded parts diagram for your specific tool model to ensure correct spring orientation and seating. Small internal springs can store tension during reassembly — use appropriate tools and eye protection throughout the process.
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