Product Description
**Milwaukee parts change not only by model# but also by serial number. Milwaukee's site lets you look up your tool's parts diagram. Enter Cat# and Select Service Parts. Also match Serial Number.
Milwaukee Rubber Cap
Model Number: 31-12-0420
The Milwaukee 31-12-0420 is a genuine OEM Rubber Cap for the 5446-21 14 lb. SDS-MAX Demolition Hammer and compatible Milwaukee SDS-MAX rotary and demolition hammers. The rubber cap is a molded elastomeric cover that seals and protects an opening on the hammer, helping keep grease in and dust, chips, and jobsite debris out of the point it covers. On a high-vibration, high-impact tool like an SDS-MAX hammer these caps work hard: they can harden, tear, or work loose over time, and a cracked or missing cap leaves the covered point exposed to contamination. Because this cap is called out as a maintenance item on the service parts list and included in the hammer's Maintenance Service Kit, it is a routine replace-during-service part. Fitting the genuine Milwaukee OEM rubber cap restores the correct bore, wall thickness, and rubber compound for the point it seals, where an off-spec cap may not seat or seal correctly.
This rubber cap is identified as the Rubber Cap, Figure 33, on the Milwaukee service parts list for the 5446-21 14 lb. SDS-MAX Demolition Hammer, serial B39A, bulletin 54-24-5440. The same 31-12-0420 rubber cap is used across several Milwaukee SDS-MAX rotary and demolition hammers, so it fits more than one model; because companion parts vary by model, verify by serial number using Milwaukee's online parts lookup to confirm fitment and the correct related parts for your exact tool. It is a documented component of the hammer's Maintenance Service Kit (14-46-0290), which also bundles the bearings, seals, o-rings, and other wear parts for a full service, so if you are servicing the hammer rather than replacing only this cap, the maintenance kit may be the better choice. Because Milwaukee specifies service parts by serial number as well as catalog number, verify your catalog and serial number against the official Milwaukee service parts diagram before ordering, since running production changes can alter part compatibility within the same catalog number.
Features
- Genuine Milwaukee OEM rubber cap
- For the 5446-21 14 lb. SDS-MAX Demolition Hammer
- Also fits compatible Milwaukee SDS-MAX rotary and demolition hammers
- Molded rubber cover that seals and protects an opening on the hammer
- Helps keep grease in and dust, chips, and debris out of the covered point
- Figure 33 on the service parts diagram (bulletin 54-24-5440, SER B39A)
- Documented component of the Maintenance Service Kit (14-46-0290)
- A routine replace-during-service wear part on high-impact hammers
- Replace if cracked, torn, hardened, or missing
- Correct OEM bore, wall thickness, and rubber compound for a proper seal
- Fits multiple models, so verify by serial number for your tool
- Sold individually
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 31-12-0420
- Official Description: Rubber Cap
- Component Type: SDS-MAX rotary and demolition hammer sealing cap
- Primary Fitment: Milwaukee 5446-21 14 lb. SDS-MAX Demolition Hammer, SER B39A
- Also Referenced On: Multiple Milwaukee SDS-MAX rotary and demolition hammers; included in Maintenance Service Kit 14-46-0290; verify by serial number using Milwaukee's online parts lookup
- Parts Diagram Position: Figure 33 (bulletin 54-24-5440)
- Quantity: Sold individually (1 cap)
- Part Type: Genuine Milwaukee OEM Replacement Part
Includes
- (1) Rubber Cap
This is the individual rubber cap. The complete Maintenance Service Kit (14-46-0290) that includes this cap, along with the hammer's other seals and o-rings, is NOT included and is sold separately. Because this cap fits several SDS-MAX hammers and companion parts vary by model, always verify by serial number using Milwaukee's online parts lookup before ordering.
