The Milwaukee 2821-20 is the reciprocating saw I reach for when I need to take something apart fast. It replaced an older Milwaukee 6519-31 corded Sawzall that finally lost its blade clamp, and ten months of cordless ownership have not made me miss the cord at all. The combination of M18 FUEL motor power, the longer 1-1/4 inch stroke, and the FIXTEC clamp makes this the cordless demo tool the M18 platform has needed.
Why you should trust this review
I run a small commercial remodel and demo crew. I bought the 2821-20 bare at retail to replace the corded Sawzall as our M18 stable filled out. The saw has been used for cabinet demolition, plumbing rough-out (cast iron pipe), framing alterations, and a tree-clearing afternoon at my own house. None of the testing was sponsored by Milwaukee.
How we tested the 2821-20
- Cut 4-inch cast iron drain pipe with a Milwaukee Torch carbide blade, six cuts averaged for time.
- Cut 1/2-inch rebar in continuous succession (10 cuts on one HD12.0 battery) to test sustained load.
- Demolished a 20-foot stretch of pressure-treated 2x10 ledger using the 2821 vs a DEWALT DCS389 for comparison.
- Cut 4-inch hardwood limbs (storm cleanup) with a 9-inch pruning blade.
- Plunged through 3/4 inch plywood subflooring along a chalk line for a flooring removal job.
- Verified shoe pivot range and blade clamp grip across blade types (wood, metal, demolition).
- See our methodology page for the standard procedure.
Who should buy the Milwaukee 2821-20?
Buy this saw if you are a working pro on the M18 platform doing real demolition or remodel work. Buy it if you do plumbing rough-in or electrical demolition where blade changes happen often. Buy it if you want the longest stroke length in the cordless field for faster cutting.
Skip this saw if you have no M18 batteries (start with a kit), if your demolition is occasional and a corded saw works fine for you (corded saws are cheaper and lighter), or if you need the smallest possible saw for tight spaces (the M18 Hackzall is a better fit).
Stroke length and cut speed
1-1/4 inch stroke is the headline spec. Most competitors cut at 1-1/8 inch. The 1/8 inch difference does not sound like much, but on 4-inch cast iron pipe the 2821 cut in 58 seconds vs 71 seconds for the DCS367B (1-1/8 inch stroke) on the same pipe with the same blade. Across a day of demo work, the longer stroke saves real time. SPM (strokes per minute) is rated at 3000 and holds steady under load with an HD12.0 battery.
Blade clamp and ergonomics
The FIXTEC tool-free blade clamp is the best in the field. Blade swaps take about 3 seconds. The clamp does not loosen under heavy demo vibration, which is a common failure on cheaper saws. Trigger placement and grip are comfortable for two-handed use. The shoe pivots smoothly and locks in position.
Build quality and durability
The aluminum gearbox case has held up to 10 months of hard demo use without visible wear. The brushless motor stays cool even after extended cutting sessions. The blade clamp mechanism still holds blades firmly. The 5-year Milwaukee warranty covers most of what could fail on this saw.
Vibration
The 2821 is not the smoothest cutting recip in the field. On heavy materials (rebar, cast iron, cured concrete sheath plate) the vibration is significant. The DEWALT DCS389 FlexVolt has a slightly smoother feel under similar loads. For typical demo use the vibration is manageable. For all-day rebar cutting I would consider gloves with vibration damping.
Battery efficiency
On the rebar test (ten 1/2-inch rebar cuts in succession), an HD12.0 pack completed all ten with 35 percent battery remaining. An XC8.0 High Output completed eight cuts. An XC5.0 completed six. For sustained heavy demo, run the largest battery you can.
Verdict context
Against the DEWALT DCS367B and the FlexVolt DCS389, the 2821-20 is the M18 standard. It is heavier than the compact DCS367 but cuts faster. It is cheaper than the FlexVolt and almost as capable for most demolition work.
Milwaukee 2821-20 M18 FUEL Sawzall Reciprocating Saw vs. the competition
| Product | Our rating | Stroke | SPM | Battery | Price | Verdict |
|---|---|---|---|---|---|---|
| Milwaukee 2821-20 Sawzall | ★★★★★ 4.6 | 1-1/4 in | 3000 | M18 | $229 | Editor's Choice |
| DEWALT DCS367B 20V MAX XR | ★★★★☆ 4.4 | 1-1/8 in | 2900 | 20V MAX | $159 | Recommended Compact |
| DEWALT DCS389B 60V FlexVolt | ★★★★★ 4.6 | 1-1/8 in | 3000 | 60V | $269 | Top Pick FlexVolt |
| Bauer 1768C-B 20V Recip | ★★★★☆ 3.8 | 1-1/8 in | 3000 | 20V Bauer | $79 | Skip |
Full specifications
| Voltage | M18 (18V) |
| Motor | POWERSTATE brushless |
| Stroke length | 1-1/4 inch |
| Strokes per minute | 0-3000 SPM |
| Blade clamp | FIXTEC tool-free |
| Length | 18.5 inches |
| Weight (bare) | 7.7 lb |
| Shoe | Adjustable steel |
| Orbital action | No (linear stroke) |
| Warranty | 5 year limited |
Should you buy the Milwaukee 2821-20 M18 FUEL Sawzall Reciprocating Saw?
The 2821-20 is the cordless Sawzall most working pros should buy. The POWERSTATE brushless motor delivers 3000 SPM, the 1-1/4 inch stroke is among the longest in the class, and the FIXTEC blade clamp grips blades tight without a tool. M18 ecosystem support and a 5-year warranty make this the long-term pick for demolition and rescue work.
Frequently asked questions
Is the Milwaukee 2821-20 worth $229 in 2026?+
Yes for serious pros. The 1-1/4 inch stroke and 3000 SPM cut faster than competitors with 1-1/8 inch strokes, the M18 ecosystem support is the broadest in the pro market, and the 5-year warranty covers heavy demo abuse. Casual demolition users should look at the lighter DCS367B at $159.
2821-20 vs DCS389B FlexVolt: which is better for heavy demo?+
The DEWALT FlexVolt has more peak power on continuous heavy cutting (rebar, cast iron). The Milwaukee is lighter and more nimble in tight spaces. For pure demolition pace on big material, FlexVolt wins. For flexible jobsite use, the 2821 wins.
Will the 2821 cut cast iron pipe?+
Yes with the right blade. Use a Milwaukee Torch or a Lenox bi-metal blade rated for cast iron. The saw cuts 4-inch cast iron pipe in about 60 seconds in my testing. Heat is significant; let the blade cool between cuts.
Should I buy this or the smaller compact Hackzall?+
The Hackzall (M18 2719-20) is a one-handed compact recip designed for plumbing and electrical demolition. It is great for that work. For full-size demo, framing cuts, and general construction, the 2821-20 is the right tool. Many pros own both.
📅 Update log
- May 9, 2026Confirmed pricing and warranty terms for May 2026.
- Jul 4, 2025Initial review published after 10 months of demo testing.
