Brand | Astro Pneumatic |
---|---|
Voltage | 120 |
Power Source | pneumatic-powered |
Color | Black,blue,gold |
Special Feature | lightweight |
Included Components | attachments |
Item Weight | 0.8 Pounds |
Maximum Rotational Speed | 56000 RPM |
Style | 1-PACK |
Item dimensions L x W x H | 5.2 x 14.5 x 19.7 inches |
UPC | 745227001019 |
Global Trade Identification Number | 00745227001019 |
Manufacturer | Astro Pneumatic |
Part Number | APT-218 |
Item Weight | 12.8 ounces |
Product Dimensions | 5.2 x 14.5 x 19.7 inches |
Country of Origin | China |
Item model number | 218 |
Is Discontinued By Manufacturer | No |
Size | 42377 |
Material | Aluminum |
Thickness | 19.7 Inches |
Item Package Quantity | 1 |
Special Features | lightweight |
Batteries Included? | No |
Batteries Required? | No |
Warranty Description | 1 yr warranty on material and workmanship |
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Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56,000RPM,Black,gold,blue, 42377
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Purchase options and add-ons
Brand | Astro Pneumatic |
Voltage | 120 |
Power Source | pneumatic-powered |
Color | Black,blue,gold |
Special Feature | lightweight |
About this item
- Lightweight and ideal for tight spots
- Twist throttle provides variable speed control
- Designed for high speed porting and finishing of small parts
- Ideal for cleaning of dies, rotors, backing plates, brake pads, mounts plus many other applications
- Free Speed: 56,000rpm
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Sustainability features
This product has sustainability features recognized by trusted certifications.Packaging efficiencyReduced air and/or water in the product or packaging for more efficient transportation.As certified byCompact by Design (Amazon-developed Certification)
Compact by Design identifies products that, while they may not always look very different, have a more efficient design. By reducing water and/or air in the product or packaging, these become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions.Part ofClimate Pledge Friendly
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Sustainability features
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This product has sustainability features recognized by trusted certifications.Safer chemicalsMade with chemicals safer for human health and the environment.As certified byGlobal Recycled Standard
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From the manufacturer

56,000 RPM With Surgical Accuracy
Use with 1/8" stones, burs and bits to shape, clean, carve, and engrave everything from wood and plastic to welds and hardened steel. The 218 is an favorite amongst industrial manufacturers in the USA for its lightweight, accuracy and remote exhaust.
Product information
Technical Details
Additional Information
ASIN | B000RH36WU |
---|---|
Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | #29,363 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #8 in Power Die Grinders |
Date First Available | August 12, 2004 |
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Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56,000RPM,Black,gold,blue, 42377
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Product Description
From the Manufacturer
The Astro Pneumatic 218 1/8-Inch Pencil Type Die Grinder - 56,000rpm is ideal for working in tight spaces. Use for easy cleaning of dies, rotors, brake pads, mounts and many other applications. Lightweight for ease of use. Twist-Action variable speed control includes a 5 foot guarded hose. Wide range of uses includes body shops, fabrication shops, brake shops, industrial shops, die manufacturers, etc. Specifications: Collet Size: 1/8-inch, Free Speed: 56,000rpm, Overall Length: 5-1/4inch (133mm), Net Weight: 1/4-pound (.11kg), Air Inlet Thread NPT: 1/4-Inch, Air Hose I.D. Size: 3/8-inch (10mm), Avg. Air Consumption.: 4cfm, Noise Level: 73~75dB, Vibration level: 0.07m/s2, Air Pressure: 90-120psi, Hose Length: 5-Feet.
Top Brand: Astro Pneumatic Tool
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This Item Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56,000RPM,Black,gold,blue, 42377 | Recommendations | |||||
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Price | $36.29$36.29 | $31.99$31.99 | $29.99$29.99 | $23.48$23.48 | -17% $124.99$124.99 List: $149.99 | $29.99$29.99 |
Delivery | Get it as soon as Wednesday, Apr 9 | Get it as soon as Wednesday, Apr 9 | Get it as soon as Wednesday, Apr 9 | Get it as soon as Wednesday, Apr 9 | Get it as soon as Wednesday, Apr 9 | Get it as soon as Wednesday, Apr 9 |
Customer Ratings | ||||||
Sold By | Amazon.com | Oudtinx | KUNLUNSHIP | Gunpla Tools | Chaste | Shiningeyes |
power source | pneumatic-powered | Air-powered | air-powered | Air Powered | air powered | pneumatic |
max rotational speed | 56000 rpm | 65000 rpm | 70000 rpm | 58000 rpm | 6000 rpm | 56000 rpm |
minimum speed | — | 65000 rpm | 7000 rpm | — | 60000 rpm | 56000 rpm |
style | 1-PACK | Cylinder | Portable,Adjustable,Cylinder | Pencil | Pencil Grinder Only | Pencil |
included components | attachments | — | 1/8-Inch Collet | 1pc Micro Air Grinder, 10pc Mounted Stones, 1pc Mini Oiler, 1pc connector, 1pc collet, 2pc Wrench, 1pc Empty Oil Pot | (1) Pencil Grinder | 1 x PC Micro Air Grinder, 1 x PC Mini-Oiler, 1 x PC 50 "air hoses, 1 x PC Oil bottle (without oil), 2 x PC Small hand Wrenches, 1 x PC 1/4" FNPT connector, 5 x PC Grinding stone bits |
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers find the die grinder works well, with one mentioning it's particularly effective for deburring parts in small areas. The tool is easy to work with and offers good value for money, with one customer noting it performs better than a 110V version. While the speed control is generally fine, some find it finicky, and the grinder uses a lot of air. The durability receives mixed feedback, with some finding it well-built while others report it breaking after first use, and customers disagree on the size, with some appreciating its compact design while others find it too large for certain tasks.
AI-generated from the text of customer reviews
Customers find that the die grinder performs well, with one mentioning it works particularly well for deburring parts in small areas.
"Works well for grinding, good power doesn't bog done. Good quality made fast work for what I needed, would buy again!" Read more
"This is a great tool and works perfectly and is definitely a quality product. Service with this vendor was awesome...." Read more
"...Just a very handy tol." Read more
"Great for small projects" Read more
Customers find the die grinder offers good value for money, working well for its price.
"At the time of purchase this was about $50. This tool is very good for that price point. If you can supply ~90psi @ 5cfm this tool will perform well...." Read more
"...For the money a good buy still." Read more
"These are a great value and last a long time in the stainless fab shop. We use them on welds to clean up with carbide burr bits." Read more
"...They are insanely expensive and break down often. ******Important these are pencil grinder and do need to be oiled...." Read more
Customers are satisfied with the die grinder's performance, with one customer noting it can outperform a Dremel 2.
"...I ordered some new tungsten bits for it. It runs smoother than the pink neiko but overall it’s the same tool...." Read more
"Nice little grinder. Twist valve holds steady speed at any setting so far so very happy...." Read more
"...Very smooth operation, and it's much easier to control than my old Dremel...." Read more
"...As the tool has aged it does very well for precision grinding and light polishing...." Read more
Customers find the die grinder easy to work with, with one mentioning it's convenient for quick applications requiring grinding, and another noting it's effortless for chamfers and deburring.
"The tool is lite, and easy to work with, I've had it just two days now. I bought it to carve some initials on a cane/walking stick, worked great...." Read more
"...be most helpful- This is my first pneumatic tool. Learning curve is not steep tho- Changing burs is a bit awkward at first- need to use two..." Read more
"...the Dremel 1/8" bits that I have a bazillion of, and is very easy to change bits...." Read more
"...Chamfers and deburring are effortless. It is quieter than I thought it would be and really moves material...." Read more
Customers have mixed experiences with the die grinder's durability, with some finding it well-made and holding up well, while others report it breaking after first use or lasting only three weeks.
"Works well for grinding, good power doesn't bog done. Good quality made fast work for what I needed, would buy again!" Read more
"...They are insanely expensive and break down often. ******Important these are pencil grinder and do need to be oiled...." Read more
"This is a great tool and works perfectly and is definitely a quality product. Service with this vendor was awesome...." Read more
"...the bits that come with it are low quality but for the money i cant complain...." Read more
Customers have mixed experiences with the die grinder's speed control, with some finding it fine to regulate and praising its high RPM capabilities, while others report that it is finicky and has very low torque.
"...Good quality made fast work for what I needed, would buy again!" Read more
"...They get very hot and will run slower and slower. Buy the neiko it is the better buy...." Read more
"Nice little grinder. Twist valve holds steady speed at any setting so far so very happy...." Read more
"Adjustable speed with carbide tools make a great tool to deburr machined parts." Read more
Customers have mixed opinions about the die grinder's size, with some appreciating its compact design while others find it too large for their needs.
"...I use them for very precise machining of alloy and wood. 1/8 diameter bits fit perfectly. If the price of these go up slightly...no worries...." Read more
"...I don't know how much air this would use, the line seems pretty small, so I assume it would be easy with a smaller tank......" Read more
"This little pencil grinder fills a necessary gap in it being a small handheld tool...." Read more
"...So much smaller and more maneuverable than a dremel. I put a few drops of air tool oil in it when I am done using it and so far so good." Read more
Customers report issues with the die grinder's air intake, noting that it uses a lot of air and leaks from the back.
"...Eats quite a bit of air though, but totally and completely worth the hassle of an air compressor...." Read more
"...It's a little air hungry but works well...." Read more
"...Only problem I had is it leaked air from the back. Not the air tube but the back of the grinder itself. Also you better have a big air compressor...." Read more
"...Also, it's air powered so you can slow your roll by adding a little pressure and let up when you're ready to get with it...." Read more
Reviews with images

An Expensive Paperweight?
Top reviews from the United States
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- Reviewed in the United States on March 11, 2025Works well for grinding, good power doesn't bog done. Good quality made fast work for what I needed, would buy again!
- Reviewed in the United States on January 30, 2025This is a great tool and works perfectly and is definitely a quality product. Service with this vendor was awesome. I got my product the next morning after ordering it and was able to use it straight out of the box. Even my co-workers liked this and now are planning on ordering one for themselves. I'm very happy with this product and the vendor and I give them 5 stars all the way and would most definitely buy this again.
- Reviewed in the United States on July 24, 2014I have gone through 2 of these and 3 pink neikos. I use them every day for work on hardened die steel and to work in the weld on repairs. Also to scarf out porosity and to use for engraving. They will last for 5-10 years with light use but for every day work even the $500 dynabrides breakdown. That is why these are so good for $39 when i breaks a new one is so very affordable. I always keep a new backup.
So.. after using both this and the Neiko over 5 years i went through 5. I work with molten aluminum so i have had the hoses melt a few times. With the pink Nieko simply cut the hose and screw the rest back in and tightent the clamp. For that the Neiko is far superior. The astro hose is crimped so it is much more difficult to fix. I discarded the entire line and out a steel braided like on and crimped it. The neiko is better i like the blue color better but performance us hat matters. These 2 are the only ones worth buying the soiux and chicago pnuatic. Are 3 times the price but only offer a 10% performance boost if even that.. for 99% of jobs these pencils l ginders get the job done, but for that once in a year job the faster turbine grinders 75,000rpm i think are much easier. They are insanely expensive and break down often.
******Important these are pencil grinder and do need to be oiled. Do not go overboard just 1-2 drops every day of use. Get too much in there it will slow it down.
Much worse though is not to use oul at all some who came from turbine grinders which dont use oil make the mistake of not oiling them. They get very hot and will run slower and slower. Buy the neiko it is the better buy. Either way this tool is soo handy even if i did not work in tool and die i would buy one. Just a very handy tol.
- Reviewed in the United States on January 18, 2025Great for small projects
- Reviewed in the United States on February 20, 2025I love AP for starters. I owned a Neiko and it lasted one year and I attempted to drill a hole using a bit you can’t drill with and it bounced off and bent the chuck. When I got the AP my 1/8” collet was too small and couldn’t actually get a 1/8” bit in the collet so I removed the one from the bent Neiko and used it. It is perfect in every way. I ordered some new tungsten bits for it. It runs smoother than the pink neiko but overall it’s the same tool. You can interchange parts and I like that. Shouldn’t ever be proprietary. The 4 comes from the collet issue and I did try to use a pick to open it up, but it’s really tough stuff which is great so when I get a chance, I will try to open it up with a small punch or a lineup tool or something like that and see if I can open it slightly. I would strongly suggest that a P take a 18 bit and try to install it before they send it out. It could use proprietary bits, but I didn’t want that so I used the other collet so I could use 1/8” bits all the way around.
- Reviewed in the United States on June 10, 2024Nice little grinder. Twist valve holds steady speed at any setting so far so very happy. Not super torque but good enough to grind on silicon bronze with burrs.
- Reviewed in the United States on February 13, 2020I ordered this after I was unable to find my old Dremel tool, I have a full size die grinder but I needed to use some smaller felt bits in order to polish a project in some tight areas.
So I ordered this tool along with a cheap 100 pack of polishing bits.
I have been using this for a few different projects since then, and so far everything is great.
Brand name Dremel bits fit, as do some cheapie off brand bits.
Very smooth operation, and it's much easier to control than my old Dremel.
Another thing is the plastic tube thing that it has on the air line, push that onto the end of the tool and you get a nice little muffler!
I have been keeping the tool well lubricated with every use, and extra important as I want it to break in nicely.
I also saw several different choices, but I have had very good luck with Astro with some other air tools.
So I figured it was worth the few extra bucks.
I don't know how much air this would use, the line seems pretty small, so I assume it would be easy with a smaller tank...
My 60 gallon 2 stage hardly notices it, only cycling a few times when running it.
I will note that I was surprised that it even cycled that second time.
Overall, I'm happy!
Better than a Dremel, and I have one more tool to justify the cost of having my air compressor!
- Reviewed in the United States on June 3, 2023If you need to grind out a broken tap or easy-out, especially in a tight space, this is the tool. With a carbide burr, it's a good balance between aggressiveness and control, and is also good for a variety of deburring tasks and enlarging holes or slots in sheet metal. The one thing is you don't have a lot of control over the RPM, so be careful using any ceramic wheels or cutting discs, I'd stick to carbide burrs or polishing wheels. I wouldn't say that's much of a drawback though so am still giving it 5 stars.
Top reviews from other countries
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lilianaReviewed in Mexico on November 5, 2019
5.0 out of 5 stars Excelentes materiales y de uso rudo
La mejor herramienta rotatoria para trabajo pesado y manualidades, materiales de excelente calidad. El control de velocidad es muy cómodo. No se caliente como las herramientas eléctricas así que puedes estar horas y horas trabajando. Le quedan los accesorios de cualquier otra marca de 1/8, consume poco aire pero a 90psi
- Amazon CustomerReviewed in Canada on October 28, 2022
5.0 out of 5 stars Great option over other brand tools
Great tool, The price is even greater! It's perfect for fine grinder work. Air tools keep cool so they tend to last longer than electric . Looking forward to seeing how long it last for. Looks of decent quality. No vibration. Loud, and will make compressor kick over. Though this is normal with air tools lol. Great find !
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Juan Carlos MontesReviewed in Mexico on June 17, 2021
5.0 out of 5 stars Excelente pruducto
Buen diseño y velocidad, excelente calidad y el producto llega como lo muestran en la foto
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gastonReviewed in Canada on December 20, 2024
5.0 out of 5 stars fonctionne très bien
fonctionne très bien
- Craig From CanadaReviewed in Canada on November 2, 2020
5.0 out of 5 stars Pencil grinder
Very nice product with nice boxing.
Works very good.