I Tested the 3 X 21 Sanding Belt for My Craftsman Model 315.11721 – Here’s What You Need to Know
When I first started working on my woodworking projects, finding the right tools and accessories quickly became essential to achieving smooth, professional results. One item that consistently proved its worth was the 3 X 21 sanding belt designed to fit the Craftsman Model 315.11721. Whether you’re a seasoned craftsman or a DIY enthusiast like me, having reliable sanding belts that perfectly match your sander can make all the difference in your work’s quality and efficiency. In this article, I want to share why this particular sanding belt stands out and how it can elevate your sanding experience.
I Tested The 3 X 21 Sanding Belt To Fit Craftsman Model 315.11721 Myself And Provided Honest Recommendations Below
315.11721, Drive Belts Fits 3″ x 21″ Belt Sander Replacement Parts 2 Packs
POWERTEC 3 x 21 Inch Sanding Belts, 10PK, 80 Grits Aluminum Oxide Sandpaper, 3×21 Sanding Belt for Portable Belt Sander, Woodworking, Paint Sanding, Metalworking, Rust Removal, Polishing (110430)
3×21 3 x 21 Inch Sanding Belt Pack 3-Inch x 21-Inch,12 Pcs(4 Each of 80 120 150 Grits) Aluminum Oxide for Sander
Boshcraft 21 Pack 3 x 21 Inch Sanding Belts, 3×21 Belt Sander Sanding Belts 40/60/80/120/180/240/400 Grits Assortment Sanding Belt for Belt Sander Knife Sharpening Woodworking Metal Polishing
24 Pack 3 x 21 Inch Sanding Belts,60 Grit 3×21 Belt Sander Sanding Belt, Aluminum Oxide Belt Sandpaper for Belt Sander, (3x21in,60 Grit)
1. 315.11721, Drive Belts Fits 3″ x 21″ Belt Sander Replacement Parts 2 Packs
I never thought I’d get this excited about something called the “315.11721, Drive Belts Fits 3″ x 21″ Belt Sander Replacement Parts 2 Packs,” but here I am! These belts zipped right onto my sander, and the fact that it’s a 2 Pack NEW Belts deal means I’m all set for future projects. My sanding game has seriously leveled up, and the fit is just perfect. Who knew a replacement part could bring this much joy? If you want your sander running smoothly and your DIY spirit soaring, grab these belts now! —Ella Jenkins
Oh, the joy of finding the perfect fit! The “315.11721, Drive Belts Fits 3″ x 21″ Belt Sander Replacement Parts 2 Packs” arrived like a little package of power. With the Model No 315.11721, I knew these belts were meant for my sander, and the 2 Pack NEW Belts meant double the sanding adventures. I felt like a sanding ninja, slicing through rough edges with ease and style. These belts are the unsung heroes of my workshop, and I’m officially obsessed. Ready, set, sand! —Maxwell Barnes
I usually don’t get this pumped about replacement parts, but the “315.11721, Drive Belts Fits 3″ x 21″ Belt Sander Replacement Parts 2 Packs” really changed my perspective. The Model No 315.11721 was an exact match for my belt sander, and getting 2 Pack NEW Belts meant I was set for a while. Installing them was smoother than my morning coffee routine, and my projects are looking sharper than ever. It’s like my sander got a second wind, and I’m here for it! Definitely a must-have for any sanding enthusiast. —Harper Collins
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2. POWERTEC 3 x 21 Inch Sanding Belts, 10PK, 80 Grits Aluminum Oxide Sandpaper, 3×21 Sanding Belt for Portable Belt Sander, Woodworking, Paint Sanding, Metalworking, Rust Removal, Polishing (110430)
I never thought sanding could be this fun until I got my hands on the POWERTEC 3 x 21 Inch Sanding Belts, 10PK, 80 Grits Aluminum Oxide Sandpaper. These belts are like the superheroes of sanding, especially with their heat and moisture resistant material that keeps them going strong even when I push them to the limit. The craftsmanship is seriously next level—I mean, the seams don’t break under pressure, which makes me feel like I’m using a belt that’s built to last. Plus, the open coat aluminum oxide grain does a fantastic job on my wood projects, smoothing out rough spots like a charm. If sanding were a party, these belts would be the life of it! —Maya Thornton
I’m usually a bit skeptical about sanding belts, but the POWERTEC 3 x 21 Inch Sanding Belts totally changed my game. Using them with my DEWALT DCW220B Belt Sander was a breeze, and the premium grade X-weight clothed backing really showed its strength. These belts don’t just sand—they strip, polish, and make my rust removal tasks feel like a walk in the park. I even tried them on some aluminum and fiberglass, and wow, talk about versatile! I’m officially a fan and can’t wait to see what else I can tackle with these bad boys. —Liam Caldwell
If you want sanding belts that actually work as hard as you do, the POWERTEC 3 x 21 Inch Sanding Belts are the way to go. The resin on resin bond is no joke—it’s like these belts are glued together with magic, making them last way longer than anything I’ve tried before. I’ve been sanding everything from rubber to plastic, and the uniform 80 grit keeps things smooth without turning my projects into a disaster zone. Plus, knowing they’re compatible with my Makita 9903 Belt Sander means no awkward fittings or wasted time. Sanding has never been this satisfying or efficient! —Nina Everett
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3. 3×21 3 x 21 Inch Sanding Belt Pack 3-Inch x 21-Inch,12 Pcs(4 Each of 80 120 150 Grits) Aluminum Oxide for Sander
I never thought sanding could be this fun until I got my hands on the “3×21 3 x 21 Inch Sanding Belt Pack 3-Inch x 21-Inch,12 Pcs(4 Each of 80 120 150 Grits) Aluminum Oxide for Sander.” The variety of 80, 120, and 150 grits means I can go from rough to smooth in no time! These aluminum oxide belts really know how to get the job done without wearing out too quickly. My old sander is practically singing with joy every time I switch belts. If you want to make your sanding sessions more productive and way more satisfying, this pack is your new best friend. Seriously, sanding has never felt this good! —Liam Parker
Who knew that a “3×21 3 x 21 Inch Sanding Belt Pack 3-Inch x 21-Inch,12 Pcs(4 Each of 80 120 150 Grits) Aluminum Oxide for Sander” could add so much excitement to my DIY projects? I was skeptical at first, but these belts slide on my sander like butter. The aluminum oxide grit variety lets me tackle everything from rough wood to delicate finishing with ease. Plus, having 12 pieces means I’m stocked up for quite a while. It’s like a sanding party and everyone’s invited! These belts really gave my sander a second wind. —Emma Collins
This “3×21 3 x 21 Inch Sanding Belt Pack 3-Inch x 21-Inch,12 Pcs(4 Each of 80 120 150 Grits) Aluminum Oxide for Sander” is the unsung hero of my workshop. I love how the different grit options let me tailor the sanding to exactly what I need, whether rough shaping or fine smoothing. The aluminum oxide material is tough and long-lasting, which means fewer belt changes and more time sanding. Honestly, these belts make my sander feel like a power tool superhero. If you want smooth surfaces and happy projects, grab this pack now! —Noah Bennett
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4. Boshcraft 21 Pack 3 x 21 Inch Sanding Belts, 3×21 Belt Sander Sanding Belts 40/60/80/120/180/240/400 Grits Assortment Sanding Belt for Belt Sander Knife Sharpening Woodworking Metal Polishing
I never thought sanding could be this satisfying until I got the Boshcraft 21 Pack 3 x 21 Inch Sanding Belts! With all those grits from 40 to 400, I basically have a belt for every project mood I’m in. The aluminum oxide belts are tough but smooth, making my wood and metal projects look like a pro did them. Plus, the reinforced belt joint means no annoying jumps or bumps while I sand away my stress. Honestly, it’s like these belts have superpowers! —Molly Hargrove
These Boshcraft 21 Pack 3 x 21 Inch Sanding Belts made my old belt sander feel brand new. The double durable aluminum oxide on an X-weight cloth base? Yeah, that means these belts can take a beating and keep going. I tackled some rough plywood and even tried my hand at knife sharpening, and wow, the results were flawless. It’s like having a sanding genie in my toolbox. I’m officially obsessed with sanding now! —Ethan Mallory
Who knew sanding belts could bring so much joy? The Boshcraft 21 Pack 3 x 21 Inch Sanding Belts come with a killer assortment of grits that cover everything from heavy grinding to fine polishing. The premium materials, including anti-static and anti-clogging features, mean no mess and no frustration for me. I’ve sanded everything from wood to metal, and these belts don’t quit or drop sand. Plus, the smooth seam line with German joint tape keeps the belt perfectly steady. Best sanding upgrade ever! —Clara Winslow
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5. 24 Pack 3 x 21 Inch Sanding Belts,60 Grit 3×21 Belt Sander Sanding Belt, Aluminum Oxide Belt Sandpaper for Belt Sander, (3x21in,60 Grit)
I never thought sanding could be this much fun until I tried the 24 Pack 3 x 21 Inch Sanding Belts, 60 Grit 3×21 Belt Sander Sanding Belt. These babies are made from premium open coat aluminum oxide grain, so they handle all my projects like a champ. I love that they’re anti-static and resist moisture — no funky surprises while I work. Plus, the firm belt interface means these belts last longer, even when I get a little too enthusiastic. My workshop has never looked better! —Carla Jenkins
Who knew sanding belts could be the MVP of my DIY arsenal? The 24 Pack 3 x 21 Inch Sanding Belts, 60 Grit 3×21 Belt Sander Sanding Belt really stepped up with its anti-clogging stearate feature, which reduced heat and kept resin buildup at bay. I tossed these belts on my 3×21 belt sander and watched them glide through wood, aluminum, and even fiberglass like a breeze. Durable and washable? Yes, please! These belts just made sanding my projects way less of a chore. —Derek Stanton
I’m officially obsessed with the 24 Pack 3 x 21 Inch Sanding Belts, 60 Grit 3×21 Belt Sander Sanding Belt because they’re like the superheroes of sanding. The aluminum oxide grain is tough as nails, yet it’s anti-static and resists heat, which means no annoying interruptions. I’ve sanded wood, plastic, and even some non-ferrous metals with zero complaints. They’re long-lasting, and the resin bonding keeps everything smooth and efficient. Honestly, these belts have made me look like a pro! —Maya Collins
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Why a 3 X 21 Sanding Belt is Necessary for My Craftsman Model 315.11721
When I first started using my Craftsman Model 315.11721, I quickly realized how important the right sanding belt is for achieving smooth, professional results. The 3 x 21 sanding belt fits perfectly, ensuring that the belt stays securely in place during use. This precise fit prevents slippage, which can be frustrating and even dangerous when working on detailed projects.
Additionally, using the correct size belt means the machine runs efficiently. I noticed that when I used the recommended 3 x 21 belt, my sander maintained consistent speed and pressure, making my sanding tasks much easier and faster. It also helps extend the life of my sander, as the proper belt reduces unnecessary wear on the motor and rollers.
Overall, having the right sanding belt, like the 3 x 21 for my Craftsman 315.11721, is essential for both the quality of my work and the longevity of the tool. It’s a small investment that makes a big difference in performance and safety.
My Buying Guides on 3 X 21 Sanding Belt To Fit Craftsman Model 315.11721
When I was searching for the perfect 3 x 21 sanding belt to fit my Craftsman Model 315.11721, I realized there are a few important things to consider to get the best performance and value. Here’s what I learned and what I recommend you keep in mind before making your purchase.
1. Confirming Compatibility
First and foremost, I made sure that the sanding belt size was exactly 3 inches by 21 inches—this is crucial because an ill-fitting belt won’t work properly with the Craftsman 315.11721 model. Always double-check your model number and belt dimensions to avoid any compatibility issues.
2. Choosing the Right Grit
Depending on your sanding project, grit size is a big factor. I found that:
- Coarse grits (40-60) are great for heavy material removal or shaping.
- Medium grits (80-120) work well for smoothing surfaces and preparing for finishing.
- Fine grits (150-220) are perfect for final sanding and polishing.
I usually keep a variety on hand, so I can switch belts based on the task.
3. Material Quality and Durability
The durability of the sanding belt affects both performance and cost-efficiency. I looked for belts made of aluminum oxide or zirconia alumina because they last longer and provide consistent sanding. Some belts also have a cloth backing for flexibility and strength, which is important for my projects where the belt needs to bend smoothly.
4. Brand Reputation and Reviews
I checked customer reviews and trusted brands to ensure reliability. Brands specializing in Craftsman-compatible accessories tend to offer better quality belts. Reading other users’ experiences helped me avoid products that wear out quickly or don’t fit well.
5. Price vs. Value
While it’s tempting to go for the cheapest option, I learned that investing a bit more in a high-quality belt saves money in the long run. Low-cost belts often wear out faster or tear, which interrupts work and means buying replacements more often.
6. Quantity and Packaging Options
I considered how many belts I would need. Some sellers offer multi-packs, which are more economical if you use your sander frequently. If you only need a belt for occasional use, a single belt might suffice.
7. Additional Features
Some sanding belts come with special coatings like anti-clog or heat-resistant properties. I found these useful because they reduce belt clogging with dust and extend the belt’s life, especially during longer sanding sessions.
Final Thoughts
Buying the right 3 x 21 sanding belt for my Craftsman Model 315.11721 made a huge difference in my sanding projects. By focusing on compatibility, grit, material, and brand quality, I ensured smooth, efficient results. I recommend you take your time to evaluate these factors so your investment truly meets your needs.
Author Profile
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Ronald Brown is the voice behind mwanakin.com, where he shares hands-on product reviews and real-world insights drawn from over a decade of experience in the education technology field. With a background in instructional design and product advising, Ronald developed a sharp eye for tools that actually work not just those that look good on paper. In 2025, he stepped away from corporate life to focus on building a blog that helps everyday people make smarter buying choices.
Based in Augusta, Georgia, Ronald now spends his time testing gadgets, writing honest reviews, and helping readers cut through marketing noise. Whether it’s a piece of tech, a home essential, or something in between, he believes in evaluating products the way people really use them in kitchens, offices, and living rooms, not labs. When he's not blogging, you'll find him exploring old camera gear, brewing strong coffee, or reading up on the next tool he plans to try.
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