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Depends on what you’re doing and what your air setup looks like. For heavy use, it won’t beat an air grinder with a proper air supply. But if you’re running an air grinder off a regular small compressor and not using it for hours at a time, the battery grinder will probably serve you a lot better. Answer from themehkanik on reddit.com
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Harbor Freight
harborfreight.com › home › power tools › grinders › die grinders › corded die grinders
HERCULES 4 Amp, 1/4 in. Die Grinder
4 Amp, 1/4 in. Die Grinder
The HERCULES® 1/4 in., 4 Amp Die Grinder has a high-performance motor that won't bog down, delivering speeds up to 25,000 RPM. The slim barrel design with overmold grip provides ultimate access with comfort and control. The ventilated housing directs exhaust away from the user, directing air over the head for cooler grinding. The lightweight design offers effortless maneuverability in hard-to-reach areas, making it ideal for reworking dies, polishing metals, material removal, and metal grinding applications.
(4.5)
Price   $79.99
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Harbor Freight
harborfreight.com › home › power tools › grinders › die grinders › cordless die grinders
12V Brushless Cordless, 1/4 in. Right-Angle Die Grinder - Tool Only
12V Brushless Cordless, 1/4 in. Right-Angle Die Grinder - Tool Only
This HERCULES® 12V Brushless Cordless, 1/4 in. Right-Angle Die Grinder has a high-performance brushless motor that delivers speeds up to 25,000 RPM to grind, sand, polish, and machine the toughest materials. The lightweight construction reduces user fatigue. The compact size makes this grinder easy to use in confined spaces. Powered by the HERCULES® Lithium-Ion Battery System, this brushless grinder goes where the job takes it.
(4.9)
Price   $59.99
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Harbor Freight
harborfreight.com › home › power tools › grinders › die grinders › cordless die grinders
20V Brushless Cordless, 1/4 in. Die Grinder - Tool Only
20V Brushless Cordless, 1/4 in. Die Grinder - Tool Only
HERCULES™ Brushless Cordless 1/4 in. Die Grinder is powered by a high-efficiency brushless motor that delivers speeds up to 18,000 RPM. The die grinder maintains constant power in the toughest grinding, sanding, polishing, and deburring jobs.
(4.5)
Price   $69.99
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Harbor Freight
harborfreight.com › home › hercules
Hercules Grinders - Harbor Freight Tools
Find Your Local Harbor Freight Store · 2 Items · All Hercules · 2 Items · Best Match · Top Rated · Price Low · Price High · Hercules(2) Please choose a rating · $50 - $100(2) 12V(1) 20V(1) No(2) $59.99 · Add to Cart Add to List · $69.99 · Add to Cart Add to List ·
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Harbor Freight
newsroom.harborfreight.com › home › harbor freight adds 12v brushless cordless right angle die grinder to its professional hercules® line
Harbor Freight Adds 12V Brushless Cordless Right Angle Die Grinder to its Professional HERCULES® Line - Harbor Freight Newsroom
May 2, 2025 - Equipped with a high-performance brushless motor that delivers speeds up to 25,000 RPM, the Right Angle Die Grinder has a 4-mode selector switch to match the selected speed to application.
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Hercules® Tools
theherculestools.com › home › hercules die grinder
Hercules Die Grinder
April 16, 2025 - For those already invested in Milwaukee’s battery ecosystem, their cordless option makes sense. For pure performance-per-dollar or for workshop settings where an air compressor is already available, the Hercules provides superior value. Harbor Freight offers several die grinders at lower price points, including the Central Pneumatic line.
Find elsewhere
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Harbor Freight
go.harborfreight.com › sku › 56932
Coupons for HERCULES 4 Amp – 1/4 in. Die Grinder – Item 56932
The HERCULES® 1/4 in. 4 Amp Die Grinder has a high performance motor that won’t bog down, delivering speeds up to 25,000 RPM. The slim barrel design with overmold grip provides ultimate access with comfort and control. The ventilated housing directs exhaust away from the user, directing air over the head for cooler grinding.
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Hercules® Tools
theherculestools.com › home › hercules grinder
hercules grinder
April 14, 2025 - ... This HERCULES® 12V Brushless Cordless, 1/4 in. Right Angle Die Grinder has a high-performance brushless motor that delivers speeds up to 25,000 RPM to grind, sand, polish, and machine the toughest materials.
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Reddit
reddit.com › r/harborfreight › help me choose a die grinder please...
r/harborfreight on Reddit: Help me choose a die grinder please...
February 11, 2025 -

I'm trying to choose between three different setups right now for die grinders.

I have my eyes set on the following right now:

  1. Hercules Corded Electric for $56 (during the upcoming Parking Lot Sale in March)

Pros are that it's Electric so I can take it really anywhere I have access to an outlet. 25000 RPM and 4 Amp Motor. Directs air over work blowing debris away. I have a Hercules Corded Polisher and I like it.

Cons are that's it's big and bulky. Might be tough for tight areas or angles. 90 day warranty. Two wrenches for collet changes.

2. Craftsman Pneumatic for $65 (includes a grinding stone set rated for 25000 RPM and total cost is with $15 off $75 coupon).

Pros are that it has a 3 year warranty. Insulated body and spindle lock for single wrench collet changes. 21000 RPM and 4.5 CFM @ 90 PSI. I have the Craftsman Pneumatic Air Hammer and the grip is awesome and I really like the tool.

Cons are that it's right angle so might be awkward for some uses in tight deep spaces. Limited to use where I have compressor access.

3. McGraw Pneumatic Right Angle & McGraw Pneumatic Extended for about $45.50 (the Right Angle is on sale for $20 for ITC right now and the Extended can be had this weekend for $24.50 with 15% off or I can wait for a potentially better deal on it with some patience).

Pros are that should have no issues with access as I'd have both 90 degrees and straight with extended 3.5" reach. Rated to 20000 RPM and 2.9 CFM @ 90 PSI and 25000 RPM and 3.0 CFM @ 90 PSI. Insulated body. Includes 1/8" collets.

Cons are that limited to use where I have compressor access. Two wrench collet changes. 90 day warranty. McGraw is the Better tier of their Good, Better, Best system but I've never used any of their air tools before.

Admittedly most use of my die grinder would be in my workshop where I have my compressor. Even though most of my tools are battery, I still have a few corded or pneumatic.

I guess to be truly fair, I should add $10 to #1 and #3 for buying the grinding stones. Which would bring prices to $66 for #1, $65 for #2, and $55.50 for #3.

Open to all suggestions and recommendations.

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LumberJocks
lumberjocks.com › home › forums › woodworking › woodturning
Harbor Freight Hercules variable speed grinder | LumberJocks Woodworking Forum
I have been making toys recently and I bought their 1" belt sander. It works just fine. I have a sharpening station that I made that has both a Delta and Rikon slow speed grinder. As far as this Hercules, the extrusion that the motor rests on, and the motor itself, look to be a close match.
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Harbor Freight
go.harborfreight.com › coupons › 2022 › 03 › 178444-56932
HERCULES 4 Amp – 1/4 in. Die Grinder for $54.99 – Harbor Freight Coupons
August 9, 2022 - Save $69 by shopping at Harbor Freight. The HERCULES® 1/4 in. 4 Amp Die Grinder has a high performance motor that won’t bog down, delivering speeds up to 25,000 RPM. The slim barrel design with overmold grip provides ultimate access with comfort and control.
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Reddit
reddit.com › r/harborfreight › finally got my hands on the new hercules die grinder, such a handy little tool!
r/harborfreight on Reddit: Finally got my hands on the new Hercules die grinder, such a handy little tool!
July 13, 2024 - If I really needed it to be 20V I’d probably also be looking at the bigger die grinders anyway. ... Unfortunately at ~140$ for tool+battery+charger it makes more sense to stick team red. Wish that wasn’t the case because the form factor on this seems great. ... The form factor is very similar to the gen 2 Milwaukee. The new red has the updated trigger which is nice. That was my debate since I have a few M12 and plenty of Hercules tools, but I went with the Hercules since the tool itself is a third the price, and as a hobbyist that already exceeds my needs.
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Reddit
reddit.com › r/harborfreight › anyone know when or if the hercules die grinder will come back in stock ?i can't find it anywhere in any state around me for weeks. don't want to buy the milwaukee one since i already have hercules batteries
r/harborfreight on Reddit: Anyone know when or if the hercules die grinder will come back in stock ?i can't find it anywhere in any state around me for weeks. Don't want to buy the milwaukee one since I already have hercules batteries
March 5, 2025 - A sub-reddit dedicated to Harbor Freight and reviewing their tools. ... Think tariffs will hit this one and why we haven’t seen it. Just yesterday employee told me they cutting hours and raising prices. Can see it all over the store. Hurts their business model. ... Hyper Tough also has one that works decently for about $45 all-in (small battery, grinder and charger included).
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Harbor Freight
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Harbor Freight | Whatever You Do, Do It For Less
Harbor Freight buys their top quality tools from the same factories that supply our competitors. We cut out the middleman and pass the savings to you!