--- product_id: 23272825 title: "Toroid Core FT240-31 Ferrite" brand: "fair-rite" price: "NT$651" currency: TWD in_stock: true reviews_count: 8 category: "Fair Rite" url: https://www.desertcart.tw/products/23272825-toroid-core-ft240-31-ferrite store_origin: TW region: Taiwan --- # Toroid Core FT240-31 Ferrite **Brand:** fair-rite **Price:** NT$651 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** Toroid Core FT240-31 Ferrite by fair-rite - **How much does it cost?** NT$651 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/23272825-toroid-core-ft240-31-ferrite) ## Best For - fair-rite enthusiasts ## Why This Product - Trusted fair-rite brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Toroid Core FT240-31 Ferrite: desertcart.com: Industrial & Scientific Review: Great performing toroids for HF common mode chokes! - Very high quality toroids that were used to assemble 1:1 common mode chokes. Everything tested exactly where they should have and they perform great! Review: Great Product, Great Service, and even in an imperfect environment, Greater Reliability. - The folks at FW Electronics are great. This was a product I needed and wanted. I ordered it and the product arrived quickly and painlessly. Nearly all the way good. I opened the packaging and noticed a discrepancy between what I ordered and what I received. Quickly a mistake was realized and communicated to FW-Electronics. Of course, these discrepancies can cause problems if you aren't careful. FW-Electronics sent a replacement just as quickly and without additional cost to me. For most everyone, these are the critical details. Product sold, good product, fast turnaround, etc. All of those things I report about FW - Electronics. Here's the important part of the review: This company made a mistake, initially. These things happen and nobody was upset. Understanding that toroid core mixes are very specific for use in amateur radio applications (as in other applications). So there's a confidence concern in my case when I lack the test equipment to identify the different mixes. FW - Electronics helped me visually identify the core types and sent the correct (though properly labeled) toroid cores without cost to me, and let me keep the incorrect toroids (which I still will readily put to good use at my QTH or to a deserving ham learning to use RF chokes). My point in this detail is I appreciate great products and great service. But I appreciate it so much more when things *don't* go well and the company and staff make it right. Nobody's perfect, but making it perfect when it isn't shows me the company appreciates the customers' work product and respects their own. I'll keep coming back to FW! 73 DE K6RCS ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.6 out of 5 stars 414 Reviews | ## Images ![Toroid Core FT240-31 Ferrite - Image 1](https://m.media-amazon.com/images/I/51O2dNGYN+L.jpg) ## Questions & Answers **Q: What is the inside & outside diameter ?** A: OD = 2.40 in / 61.0 mm +/- 1.30 mm , ID = 1.40 in / 35.55 mm +/- 0.85 mm , this is also conveniently located in the product description in the listing. **Q: Can these be cut into two identical half toroids? I want create two identical electromagnets.** A: Perhaps the snap-on beads would be a better application. The toroids have a specific shape to keep the magnetic flux within the loop. So while I can’t answer if breaking them will work in your case, but it sounds like using a hammer when you need a wrench. Could it work? Maybe, but bludgeoning seems a bit wasteful. YMMV Maybe try Mix 31 beads. **Q: What's the difference in F240-31 and T120-31?** A: Interior diameter. **Q: Need toroid for 1mhz thru 30 mhz** A: FairRite and the listing description give the following specifications: Frequency Range: 1 - 300MHz , EMI Suppression 1 - 500 MHz ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great performing toroids for HF common mode chokes! *by A***T on October 25, 2025* Very high quality toroids that were used to assemble 1:1 common mode chokes. Everything tested exactly where they should have and they perform great! ### ⭐⭐⭐⭐⭐ Great Product, Great Service, and even in an imperfect environment, Greater Reliability. *by R***L on November 1, 2021* The folks at FW Electronics are great. This was a product I needed and wanted. I ordered it and the product arrived quickly and painlessly. Nearly all the way good. I opened the packaging and noticed a discrepancy between what I ordered and what I received. Quickly a mistake was realized and communicated to FW-Electronics. Of course, these discrepancies can cause problems if you aren't careful. FW-Electronics sent a replacement just as quickly and without additional cost to me. For most everyone, these are the critical details. Product sold, good product, fast turnaround, etc. All of those things I report about FW - Electronics. Here's the important part of the review: This company made a mistake, initially. These things happen and nobody was upset. Understanding that toroid core mixes are very specific for use in amateur radio applications (as in other applications). So there's a confidence concern in my case when I lack the test equipment to identify the different mixes. FW - Electronics helped me visually identify the core types and sent the correct (though properly labeled) toroid cores without cost to me, and let me keep the incorrect toroids (which I still will readily put to good use at my QTH or to a deserving ham learning to use RF chokes). My point in this detail is I appreciate great products and great service. But I appreciate it so much more when things *don't* go well and the company and staff make it right. Nobody's perfect, but making it perfect when it isn't shows me the company appreciates the customers' work product and respects their own. I'll keep coming back to FW! 73 DE K6RCS ### ⭐⭐⭐⭐⭐ Just right for a DIY HF Common Mode Choke!! *by B***G on January 2, 2026* Just the right size and material mix for my HF common mode choke build. I used a 10' RG-8X jumper and was able to comfortably get 8 good sized turns/loops through a pair of these Toroid Cores. ## Frequently Bought Together - Toroid Core FT240-31 Ferrite - Toroid Core FT240-43 Ferrite - FT-140-43 Ferrite Toroid Core | 43 Material --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tw/products/23272825-toroid-core-ft240-31-ferrite](https://www.desertcart.tw/products/23272825-toroid-core-ft240-31-ferrite) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-05-10*