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The Milwaukee 40-50-1155 is a genuine factory original equipment manufacturer (OEM) linear compression button spring designed for the spindle lock assembly in industrial angle grinders. This component provides the necessary return force to disengage the lock pin from the internal spindle gear slot, ensuring the drive shaft and motor armature rotate freely during tool operation. It is engineered to maintain specific spring rates and tolerances required for safe mechanical engagement and disengagement during abrasive wheel changes.
Features
Genuine OEM Specification Match: Eliminates dimensional variances and uneven spring rates found in aftermarket parts
Mechanical Return Force: Pushes the external spindle lock button to the disengaged position upon release
Lock Pin Retraction: Ensures the solid locking pin is fully withdrawn from the spindle gear to prevent internal obstruction
Calibrated Compression: Prevents accidental engagement from minor impacts while reducing operator finger fatigue
Corrosion-Resistant Surface: Treated to withstand humidity, industrial oils, cutting fluids, and metallic particulates
Fatigue Resistance: High yield strength substrate resists cyclic fatigue and retains original free length over repetitive strokes
Tool Balance Maintenance: Matches exact mass requirements of the internal gear case assembly to prevent harmonic vibration
Safety Mitigation: Prevents lock pin floating which can cause gear train destruction during high-speed operation
Specifications
Manufacturer: Milwaukee Electric Tool Corporation
Part Number (MPN): 40-50-1155
Universal Product Code (UPC): 045242254033
Component Type: Linear Compression Button Spring
Material: High-Tensile Industrial Spring Steel
Uncompressed Free Length: 0.74 in – 0.75 in (18.80 mm – 19.05 mm)
Outer Diameter (OD): 0.105 in (2.67 mm)
Component Total Width: 0.13 in (3.30 mm)
Wire Diameter: 0.012 in (0.305 mm)
Color: Polished Silver Metallic
Shipping Weight: < 0.10 lbs
Bulk Shipping Dimensions: 1.00 in x 3.00 in x 1.00 in
Required Installation Tools: Torx T-20 or T-25 screwdriver
Applications
Heavy Steel Fabrication: Weld bead cleaning, joint prepping, and structural steel beveling
