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This hour's deals
Milwaukee
Milwaukee M18 FUEL Braking Grinder 3670-20 with M18 Battery Pack
−63%
Home · The Milwaukee Store

A grinder kit for the workshop that means business

Milwaukee M18 FUEL Braking Grinder 3670-20 with M18 Battery Pack

The Milwaukee M18 FUEL braking grinder with battery pack is for DIYers and pros who want serious power.

Deal score 9.0 · Unreal
$279.00$760.00 The Milwaukee Store's regular price

You save $481.00 at The Milwaukee Store

Deal.ai's agents found this deal on November 9. The store may have changed its price since.

Why it's a great deal

  • Elsewhere right now: Motion $649.00, Home Depot $649.00, Max Tool $649.00 (typical $649.00 across 3 stores)
  • The Milwaukee Store lists its regular price at $760.00: 63% off by its own figures
  • Rated 5.0 out of 5 by 43 buyers
  • Milwaukee says it generates 13A corded power to complete the toughest grinding and cutting applications Milwaukee
Visit The Milwaukee Store

Every store we checked

  • WalmartNew

    In stockSold by JC WellerReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $189.99Free shippingVerified
    Visit Walmart
  • The Milwaukee StoreNew

    In stock

    $279.00Observed at 2:52 AM
    Visit The Milwaukee Store
  • Blain's Farm & FleetNew

    In stock

    $279.00Observed at 2:52 AM
    Visit Blain's Farm & Fleet
  • Home DepotNew

    In stock

    $649.00Observed at 3:46 AM
    Visit Home Depot
  • MotionNew

    In stock

    $649.00Observed at 3:46 AM
    Visit Motion
  • Tool NutNew

    In stock

    $649.00Observed at 3:46 AM
    Visit Tool Nut
  • Grainger Industrial SupplyNew

    In stock

    $778.93Observed at 3:46 AM
    Visit Grainger Industrial Supply
  • eBayPre-owned

    Availability unknownSold by the_tool_connect_inc (99.7% positive, 1,100 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $134.99Free shippingVerified
    Visit eBay
  • eBayNew

    Availability unknownSold by la_6049 (100% positive, 35 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $170.00Free shippingVerified
    Visit eBay
  • SupplyHouse.comNew

    Availability unknown

    $649.00Observed at 3:46 AM
    Visit SupplyHouse.com
  • FergusonNew

    Availability unknown

    $649.00Observed at 3:46 AM
    Visit Ferguson
  • Max ToolNew

    Availability unknown

    $649.00Observed at 3:46 AM
    Visit Max Tool
  • Great Lakes Power ToolsNew

    Availability unknown

    $649.00Observed at 3:46 AM
    Visit Great Lakes Power Tools
  • MSC Industrial SupplyNew

    Availability unknown

    $788.07Observed at 3:46 AM
    Visit MSC Industrial Supply

Store links may earn us a commission. Some prices via Klarna.

Price history and every store's price →

Reading The Milwaukee Store’s product page for the details…

Specs

Power Source
Cordless Electric
Amperage
0 A
Voltage
18 V
Maximum Speed
9,000 RPM
Variable Speed
No
Grinder Type
Angle grinder
Grinder Brand
Milwaukee
Grinder Series
M18 FUEL
Grinder Model Number
3670-20
Grinding Wheel Size
6 in.

About the Milwaukee M18 FUEL Braking Grinder 3670-20 with M18 Battery Pack

The 3670-20 is Milwaukee's cordless 6-inch angle grinder on the M18 platform, built around a brushless FUEL motor that spins at 9,000 RPM. Its headline feature is a mechanical brake that stops the wheel quickly when you release the trigger, plus a tool-free guard and a slim body for one-hand work. It runs on any M18 pack, so it suits tradespeople already invested in Milwaukee batteries who want grinder power without a cord. Against corded 6-inch grinders it gives up some sustained power, and against smaller 4.5-inch cordless models it is heavier but cuts deeper.

Best forMetalworkers cutting and grinding on site without powerMilwaukee M18 owners adding a grinder to their kitOne-handed work in tight spacesWeld prep and pipe cutting
Pros
  • Mechanical brake stops the wheel fast for safer handling
  • Brushless FUEL motor reaches 9,000 RPM on 18 V
  • 6-inch wheel gives deeper cuts than 4.5-inch grinders
  • Tool-free guard and spindle lock speed up wheel changes
  • Runs on the whole M18 battery line
Cons

More deals like this

  • All Milwaukee deals and products
  • All The Milwaukee Store deals and prices
  • All Blain's Farm & Fleet deals and prices
  • All Grainger Industrial Supply deals and prices
  • Early Black Friday Tool Deals 2026

Price facts

  • This deal was $279.00 at The Milwaukee Store on Nov 9.
  • Lowest price today: $170.00 at eBay (checked Nov 9, 2026).
  • Checked at 13 stores.

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  • Battery and charger are not included
  • Heavier and bulkier than 4.5-inch cordless grinders
  • No variable speed, so it is not ideal for polishing
  • Sustained heavy grinding drains packs quickly

What reviewers say

  • 5 / 543 ratings

Owners rate it highly, praising the brake, the power and the smooth running. Most complaints center on weight and the fact that batteries are sold separately.

What people mention
  • BrakePraisedOwners say the wheel stops almost immediately when the trigger is released, which they see as a real safety gain.
  • PowerPraisedReviewers say it cuts and grinds close to corded performance on a fresh high-capacity pack.
  • WeightCriticisedSeveral owners find it heavy for overhead work and long one-handed sessions.
  • BatteryMixedRuns well on M18 packs, but heavy grinding drains them fast and none is included.
  • BuildPraisedOwners describe the body and guard as sturdy and well made.

Questions and answers

Does the 3670-20 come with a battery?
No. The tool is sold bare, and the battery pack shown in the listing is a separate item. You need an M18 pack and charger to run it.
How does it compare with the 4.5-inch M18 grinder?
The 6-inch 3670-20 cuts deeper and has the brake, but it is larger and heavier. The 4.5-inch model is easier for one-hand and overhead work.
What wheels does it take?
It uses 6-inch wheels with a 5/8-11 arbor, rated for at least 9,000 RPM. Grinding, cutting and flap discs all fit.
Does it have variable speed?
No. It runs at a fixed 9,000 RPM, so it is built for cutting and grinding rather than polishing or finishing work.
Which M18 battery should I use?
A high-capacity pack such as a 6.0Ah or larger gives the longest runtime. Smaller packs work but drain faster under load.
Is the brake useful for cutting?
Yes. The wheel stops quickly after a cut, which reduces kickback risk and lets you set the tool down sooner.

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