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The Milwaukee 40-50-8780 is a genuine Original Equipment Manufacturer (OEM) Ejection Spring designed for integration into industrial hole-sawing and core-drilling systems. It functions as a mechanical return spring that resides on a pilot drill bit assembly, delivering targeted linear force to eject waste cores or slugs from the interior cavity of carbide-tipped or hole-dozer cutters upon completion of a material-cutting stroke.
Features
Automatic Zero-Downtime Slug Removal: Acts as a mechanical ejector to fire plugs clear of the cutter head instantly
Optimized Cordless Efficiency: Reduces friction drag on the pilot bit to lower peak electrical current draw
Extended Battery Runtime: Minimizes motor strain on M18 FUEL systems during core extraction
True OEM Kinetic Synergy: Matches exact spring rates and free-length parameters for the 49-57-0035 system
Structural Anti-Jam Design: Absorbs axial vibrations during high-torque startup to protect cutting edges
Fatigue Resistance: Engineered to resist mechanical set and plastic deformation across thousands of cycles
Debris Deflection: Coating resists moisture, cutting oils, and abrasive dust generated during metalworking
Specifications
Manufacturer: Milwaukee Electric Tool Corporation
Manufacturer Part Number (MPN): 40-50-8780
Universal Product Code (UPC): 045242106523
Airgas Part Number: MET40-50-8780
Hanes Supply Identifier (HSI): 40-50-8780-11961
Energy Avenue Part ID: 4294617
OneSource Distributors Part ID: 4045542
Component Classification: Power Tool Accessories / Replacement Mechanical Parts
Spring Typology: Open-coil compression spring
Resistance Type: Straight-line linear
Substrate Material: Industrial-grade high-tensile spring steel wire alloy
Metallurgical Properties: Heat-treated and tempered
