Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukee's website please click here:
Milwaukee O-Ring
Model Number: 34-40-0900
The Milwaukee 34-40-0900 is a genuine OEM O-Ring replacement component for compatible Milwaukee power tools — a precision-sized elastomeric sealing ring used in Milwaukee tool assemblies wherever a dynamic or static seal is required to prevent lubricant leakage from gear cases, prevent moisture and debris ingress through tool body interfaces, and maintain the internal pressure differentials in pneumatic and hydraulic tool components. O-rings are consumable sealing components that degrade through a combination of compression set, material aging, chemical exposure to lubricants and solvents, and the mechanical stress of repeated assembly and disassembly during service operations. When an O-ring loses its elastic recovery, develops surface cracking, swells from lubricant absorption, or sustains a nick or cut from service tool contact, it can no longer maintain an adequate seal and must be replaced to restore proper tool sealing function.
Using a genuine Milwaukee OEM O-ring ensures the correct elastomer material specification, durometer (hardness), inside diameter, and cross-sectional diameter for the specific sealing application in the Milwaukee tool being serviced. O-ring dimensions must precisely match the groove they seat in — an O-ring that is too small in cross-section will not seal adequately under compression, and one that is too large will not fit the groove without distortion that compromises seal integrity. O-ring material must also be compatible with the specific lubricant and operating environment of the tool application. Always verify your specific Milwaukee tool model number and serial number at milwaukeetool.com to confirm the correct O-ring part number for your specific tool and sealing location before ordering.
Features
- Genuine Milwaukee OEM O-ring — correct dimensions and elastomer for specific tool application
- Restores lubricant containment and debris/moisture exclusion sealing function
- Replace when O-ring shows compression set, cracking, swelling, or physical damage
- Correct material, diameter, and cross-section critical for effective sealing performance
- Verify tool model and serial number at milwaukeetool.com before ordering
Specifications
- Type: O-Ring Sealing Component
- Compatible Tools: Milwaukee Power Tools (verify model and serial number)
Includes
- (1) Milwaukee 34-40-0900 O-Ring
