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 Rubber Bearing Cap
Model Number: 42-96-0405
The Milwaukee 42-96-0405 Rubber Bearing Cap is a genuine OEM replacement part used across multiple Milwaukee corded angle grinder service parts bulletins, including bulletins 54-38-2310, 54-38-2332, 55-38-2321, and 54-38-0060, covering a range of Milwaukee's older corded paddle-switch and trigger-grip angle grinders (including the 6143-31 13-amp 5 in. Lock-On Trigger Grip Angle Grinder). Sometimes referenced by authorized dealers as a "Rubber Bearing Cup," the cap is the small rubber seal that fits at the rear of the motor armature shaft over the ball bearing area, protecting the bearing from dust, abrasive grinding debris, and contamination while sealing the rear of the motor housing. On a corded grinder, the rear motor bearing is one of the highest-stress wear components in the entire tool, so any compromise to the bearing seal directly affects motor service life.
A torn, cracked, hardened, deformed, or missing rubber bearing cap exposes the rear ball bearing to abrasive grinding dust, metal particles, concrete and masonry debris, and other contamination that can wear out the bearing prematurely and lead to expensive armature and field assembly damage. Replacing the cap with this OEM service part restores correct bearing protection and motor sealing, and is one of the highest-value preventive maintenance steps an owner can perform when servicing the motor area of a corded Milwaukee grinder. The 42-96-0405 works in conjunction with the rear Ball Bearing (Milwaukee 02-04-2110), Plastic Disc (Milwaukee 31-86-0090), Bearing Retainer (Milwaukee 44-86-0155), and the Armature Assembly, all of which are sold separately. Because Milwaukee Tool specifies replacement parts by both catalog number and serial number, always verify your tool's serial number against the official Milwaukee service parts diagram before ordering, since the 42-96-0405 fits multiple older Milwaukee corded angle grinder platforms and the exact serial-code range varies. Verify by serial number using Milwaukee's online parts lookup before ordering to confirm correct fitment for your specific grinder.
Features
- Genuine Milwaukee OEM replacement, direct factory part for the 42-96-0405 reference
- Compatible with multiple Milwaukee corded paddle-switch and trigger-grip angle grinders when verified by serial number
- Documented across Milwaukee bulletins 54-38-2310, 54-38-2332, 55-38-2321, and 54-38-0060
- Rubber cap seals the rear motor bearing area against grinding dust and debris
- Protects the rear armature ball bearing from contamination
- Critical preventive-maintenance part, protects the armature and field assembly from expensive secondary damage
- Works in conjunction with Ball Bearing (02-04-2110), Plastic Disc (31-86-0090), and Bearing Retainer (44-86-0155)
- Sometimes referenced by authorized dealers as "Rubber Bearing Cup"
- Manufactured to Milwaukee factory tolerances and rubber compound specifications
- Direct-fit replacement, no modification required for installation
- Restores correct motor sealing after tearing, cracking, hardening, deformation, or loss
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 42-96-0405
- Official Description: Rubber Bearing Cap
- Also Known As: Rubber Bearing Cup
- Component Type: Motor Rear Bearing Seal Cap
- Material: Rubber compound
- Primary Fitment: Multiple Milwaukee corded angle grinder platforms (verify by serial number)
- Confirmed Tool Reference: Milwaukee 6143-31 13-amp 5 in. Lock-On Trigger Grip Angle Grinder (bulletin 54-38-0060)
- Service Bulletin References: 54-38-2310, 54-38-2332, 55-38-2321, 54-38-0060
- Companion Parts: 02-04-2110 Ball Bearing, 31-86-0090 Plastic Disc, 44-86-0155 Bearing Retainer (all sold separately)
- Part Weight: 0.01 lb
- Quantity: Sold individually, 1 cap per order
- Part Type: OEM Service Replacement Part
Includes
- (1) Milwaukee 42-96-0405 Rubber Bearing Cap
- Note: Rear Ball Bearing (Milwaukee 02-04-2110) is NOT included and sold separately. Recommended for inspection at the same time as the bearing cap, since cap failure often allows bearing contamination and accelerated wear
- Note: Verify your tool's catalog number and serial number against the official Milwaukee parts diagram before ordering
