Milwaukee® Lock-On Button Spring (For Use With Angle Grinder)
Airgas Part #:MET40-50-1155
Manufacturer Part #:40-50-1155
Log in to get your price
$1.23
Each
$1.23
/Each
Item Details
- 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- Lock Pin Retraction: Ensures the solid locking pin is fully withdrawn from the spindle gear to prevent internal obstruction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
- Mechanical & Structural Piping: Field-cutting pipe schedules, flushing joints, and oxidation removal
- Automotive Manufacturing: Grinding, blending, and body panel finishing stations
- MRO Field Maintenance: Machine rebuilds, fastener removal, and industrial plant infrastructure restoration
- Compatible Milwaukee 4.5" Grinders: 6146-30, 6146-31, 6147-30, 6147-31
- Compatible Milwaukee 5" HP Grinders: 6117-30 (C91A), 6117-31 (C92A), 6117-31B (C93A)
- Compatible Milwaukee 6" HP Grinders: 6161-30, 6161-31
Product Attributes
Product Type
» Button Spring