Product Description
Milwaukee Disc Retaining Nut for Sander/Polisher
Model Number: 49-40-0390
The Milwaukee 49-40-0390 is a replacement Disc Retaining Nut specifically for Milwaukee Sander/Polisher models — the threaded nut that secures the sanding pad, polishing pad, or disc onto the sander/polisher spindle by threading onto the spindle and clamping the accessory between the nut face and the inner flange. The retaining nut must be tightened to the manufacturer-specified torque to achieve the clamping force that holds the pad or disc concentrically and securely during operation at the sander/polisher's operating speed. Unlike angle grinder retaining nuts that are tightened firmly, sander/polisher retaining nuts use a specific torque that allows the backing pad to flex and orbit properly while remaining securely retained — applying incorrect torque, whether too little or too much, affects both pad performance and safety. A damaged, stripped, or worn retaining nut cannot achieve the correct clamping geometry for safe pad retention during the sustained polishing and sanding cycles of automotive detailing, surface finishing, and woodworking applications.
This retaining nut is specifically dimensioned for Milwaukee Sander/Polisher spindle thread and flange specifications — it is not interchangeable with angle grinder retaining nuts, which use different thread specifications and clamping face geometry even when the nominal thread diameter appears similar. Using the correct Milwaukee sander/polisher retaining nut ensures the pad operates with the designed clamping force and pad flexibility the tool's backing plate system requires. Verify your specific Milwaukee sander or polisher model number at milwaukeetool.com before ordering, as sander/polisher retaining nut specifications vary between Milwaukee polisher and sander models. Replace immediately when the nut is damaged, deformed, or threads are stripped.
Features
- Replacement retaining nut specifically for Milwaukee Sander/Polisher models
- Correct clamping geometry for proper pad flex and secure retention during operation
- Not interchangeable with angle grinder nuts — different thread and face specification
- Replace immediately when nut is stripped, damaged, or correct torque is lost
- Verify Milwaukee sander/polisher model before ordering
Specifications
- Type: Disc Retaining Nut
- Compatible Tools: Milwaukee Sander/Polisher Models (verify model)
Includes
- (1) Milwaukee 49-40-0390 Disc Retaining Nut for Sander/Polisher
