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MILWAUKEE M12 BPS-421X subcompact cordless polisher/sander in HD Box (1x 4.0/2.0Ah battery + charger) - 4933447799

MILWAUKEE
Supplier number: MILWAUKEE 4933447799 | EAN 4002395006564

Variant

MILWAUKEE M12 BPS-0 subcompact cordless polisher/sander (without battery and charger) - 4933447791 MILWAUKEE M12 BPS-0 subcompact cordless polisher/sander (without battery and charger) - 4933447791 MILWAUKEE M12 BPS-421X subcompact cordless polisher/sander in HD Box (1x 4.0/2.0Ah battery + charger) - 4933447799 MILWAUKEE M12 BPS-421X subcompact cordless polisher/sander in HD Box (1x 4.0/2.0Ah battery + charger) - 4933447799
Recommended Retail Price €328.36
252.91 tax incl.
€209.02 excl. VAT (incl. all environmental contributions)
On stock - immediately available

✆ Talk to a specialist

Milwaukee M12 & M18 Free Battery Promotion 2026

Receive a free M12 B4 12V 4.0 Ah Li-ion battery when purchasing participating Milwaukee M12 items from €120 excl. VAT! Promotion valid from 01.09.2026 to 30.09.2026.

How does it work?

  • Purchase participating Milwaukee M12 items for a minimum of €120 excl. VAT and receive a free M12 B4 12V 4.0 Ah Li-ion battery.
  • Register your purchase via the official promotion page.
  • Registration is possible until 14 October 2026. The invoice date must be between 01.09.2026 and 30.09.2026.
  • You can claim a maximum of 5 free batteries per end user.
  • After approval of your registration, you will receive the free battery directly from Milwaukee within 30 days.
  • The promotion is only valid for purchases with a billing address in the Netherlands, Belgium or Luxembourg.
  • Participating Milwaukee M12 tools are recognisable by the promotion label on the product page. Click the label to view all participating items.

Milwaukee M12 and M18 Free Battery Promotion 2026

Accurate surface finishing with Milwaukee M12 BPS-421X

Practical benefits
  • Two speeds for versatility: You select between two speed modes to switch smoothly between fine polishing and effective sanding tasks.
  • Access to tight spaces: The compact body of only 130 mm allows you to work comfortably in confined and awkward areas.
  • Fast tool-free accessory changes: A built-in spindle lock enables you to swap polishing and sanding pads quickly without extra tools.

In a nutshell

The right choise for

With the Milwaukee M12 BPS-421X, you tackle precise spot repairs, paint corrections, and fine sanding in confined vehicle areas. Thanks to a compact length of only 130 mm, you navigate effortlessly around tight contours, bumpers, and door jambs. Two selectable speeds let you switch smoothly between polishing and sanding tasks, while the spindle lock enables tool-free accessory changes. Supplied in a sturdy hd Box with a 4,0Ah and a 2,0Ah M12 battery, a C12 C charger, 76 mm and 50 mm backing pads, polishing sponges, lambswool, and a side handle, this kit gives you the control and flexibility needed for flawless finishing.

Recommended Combinations
With Milwaukee M12 3 Ah Battery
With Milwaukee M12 4 Ah Battery
milwaukee_4933447799
MILWAUKEE M12 BPS-421X... x 1
252.91
milwaukee_4932451388
MILWAUKEE M12 B3 Li-ion... x 1
89.00
Original Price (tax incl.): 341.91
You Save: -4.45
Bundle Price (tax incl.): 337.46


Product information Accessories FAQ
€252.91
In stock - tax incl.

Product information

Key features according to our expert

  • Battery voltage: 12 V
  • Capacity (battery): 2 Ah; 4 Ah
  • Support disc diameter: 76 mm
  • Supplied in: System case
  • Type of system case: HD Box
  • Weight: 0,8 kg
  • UN number: UN3481
  • Number of batteries included: 2
  • Product Range: Milwaukee M12

Supplied as standard

  • 1 x M12 B4 Battery pack
  • 1 x M12 B2 Battery pack
  • C12 C Charger
  • Supplied in: HD Box
  • Polishing pad
  • Sanding pad
  • Polishing sponge white
  • Polishing sponge yellow
  • Lambswool
  • Side handle

Product description

  • Variable 2 speed selection (0-2800 / 0-8300 RPM) for both polishing and sanding applications
  • REDLINK overload protection electronics in tool and battery pack deliver best in class system durability
  • Large capacity of 76 mm polishing sponge and 50 mm sanding pad size for fast job completion
  • Long run time allows frequent task completion with one battery charge
  • Compact design with only 130 mm allows access to hard areas
  • Spindle lock allows fast, tool free accessory change
  • Detachable 2 position side handle
  • Individual battery cell monitoring optimises tool run time and ensures long term pack durability
  • REDLITHIUM battery pack provides superior pack construction, electronics and fade-free performance to deliver more run time and more work over pack life
  • Flexible battery system: works with all MILWAUKEE M12 batteries
  • Supplied with polishing pad, sanding pad, polishing sponge white, polishing sponge yellow, lambswool, side handle

All Features

Battery voltage
12 V
Capacity (battery)
2 Ah; 4 Ah
Support disc diameter
76 mm
Supplied in
System case
Type of system case
HD Box
Weight
0,8 kg
Un number
UN3481
Number of batteries included
2
Polishing vibration level, deviation (m/s²)
1.83
Sanding vibration level (m/s²)
2.3
Axis connection
M9 x 0.75
Sound power level, deviation (db(a))
3
Sound power level (lwa(db(a))
79.2
Vibration level sanding, deviation (m/s²)
1.5
Polishing vibration level (m/s²)
2.95
Voltage (v)
12
Sound pressure level, deviation (db(a))
3
Product range
Milwaukee M12
Battery type
Li-ion
Number of batteries supplied
2
Battery capacity (ah) 2
1 x 2.0 + 1 x 4.0

Accessories

View more accessories (33)

Frequently asked questions about this product

Answered by specialists
What is included with the M12 BPS-421X?
You receive a 4,0Ah battery, a 2,0Ah battery, a C12 C charger, an HD Box, a polishing pad, a sanding pad, two polishing sponges (white and yellow), lambswool, and a side handle.
What are the diameters of the included backing pads?
The polishing pad has a diameter of 76 mm and the sanding pad has a diameter of 50 mm.
Can this tool be used for both polishing and sanding?
Yes, with two selectable speeds you can switch between polishing (0-2800 RPM) and sanding (0-8300 RPM).
Is this tool compatible with all Milwaukee M12 batteries?
Yes, the flexible battery system works with all Milwaukee M12 batteries.
Do you need tools to change accessories?
No, the spindle lock allows quick and tool-free accessory changes.
Questions about this product?

Our product specialists are happy to help with any questions about this range. Call, email or chat with us!

Chat with us
0800 0226 945 [email protected]

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