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 Flange Nut for 4-1/2 in. and 5 in. Angle Grinders
Model Number: 51-05-0050
The Milwaukee 51-05-0050 Flange Nut is a genuine OEM replacement service fastener designed for Milwaukee 4-1/2 in. and 5 in. corded and cordless angle grinders, including the Milwaukee 6145 4-1/2 in. and 5 in. Grinder and other Milwaukee angle grinder platforms in the same accessory family. This part replaces obsolete part number 49-05-0050 - Milwaukee retired the old part number and reissued the same flange nut under the current 51-05-0050 catalog number, so customers ordering replacement flange nuts using the older 49-05-0050 reference should order this 51-05-0050 as the correct current replacement. The flange nut is the outer fastener that threads onto the grinder's spindle to clamp the grinding wheel, cutting wheel, flap disc, wire wheel, sanding pad, or other 4-1/2 in. or 5 in. accessory tightly against the inner backing flange, retaining the accessory securely during the high-speed rotation that defines angle grinder operation. The round base distributes the clamping force over a wider contact area than a standard hex nut, delivering more secure and reliable accessory retention.
A worn, stripped, missing, or damaged flange nut is a serious safety issue on an angle grinder, not just an inconvenience. The flange nut is the only thing holding the accessory wheel against the inner flange under cutting and grinding loads, and a failed flange nut can allow the accessory wheel to come loose during operation, leading to wheel detachment, projectile fragments, and serious injury to the operator and bystanders. Replacing the flange nut with this OEM service part restores correct accessory clamping at the engineered Milwaukee torque specification. 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 Milwaukee uses different flange nut part numbers across their broader tool catalog (including the Milwaukee 49-05-0051 Diamond Blade Flange Nut for the same grinder family, the 44-40-0035 5/8-11 Flange Nut for different applications, and the 05-55-5001 M8 Flange Nut for M18 chainsaws), all of which are NOT interchangeable with the 51-05-0050. Verify by serial number using Milwaukee's online parts lookup before ordering to confirm correct fitment.
Features
- Genuine Milwaukee OEM replacement, direct factory part for the 51-05-0050 reference
- This part replaces obsolete part number 49-05-0050 (same function, current part number)
- Outer flange nut for Milwaukee 4-1/2 in. and 5 in. corded and cordless angle grinders
- Compatible with the Milwaukee 6145 4-1/2 in. and 5 in. Grinder and other Milwaukee 4-1/2 in./5 in. angle grinders
- Threads onto the grinder spindle to clamp accessory wheels against the inner backing flange
- Round base distributes clamping force over a wider contact area than a standard hex nut
- Retains grinding wheels, cutting wheels, flap discs, wire wheels, and sanding pads
- Critical safety component for secure accessory retention during high-speed rotation
- Manufactured to Milwaukee's original thread and flange specifications
- Metal construction (Milwaukee gray finish)
- Restores correct accessory clamping after wear, stripping, or loss of the original
- Direct-fit replacement, no modification required for installation
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 51-05-0050
- Replaces Obsolete Part Number: 49-05-0050
- Official Description: Flange Nut
- Component Type: Angle Grinder Outer Accessory Flange Nut
- Base Style: Round base
- Material: Metal
- Color: Gray
- Primary Fitment: Milwaukee 4-1/2 in. and 5 in. corded and cordless angle grinders, including 6145 4-1/2 in. and 5 in. Grinder
- Function: Clamps accessory wheels against inner backing flange on grinder spindle
- Compatible Accessories: Grinding wheels, cutting wheels, flap discs, wire wheels, sanding pads (4-1/2 in. and 5 in.)
- Quantity: Sold individually, 1 flange nut per order
- Part Type: OEM Service Replacement Fastener
Includes
- (1) Milwaukee 51-05-0050 Flange Nut
- Note: This part replaces obsolete part number 49-05-0050. Customers ordering using the older 49-05-0050 reference should order this 51-05-0050 as the correct current replacement. Milwaukee uses different flange nut part numbers across their broader tool catalog (including 49-05-0051 Diamond Blade Flange Nut, 44-40-0035 Flange Nut 5/8-11, and 05-55-5001 M8 Flange Nut for chainsaws), all of which are NOT interchangeable with the 51-05-0050
- Note: Verify your tool's catalog number and serial number against the official Milwaukee parts diagram before ordering
