--- product_id: 23272871 title: "Toroid Core FT240-43 Ferrite" brand: "fair-rite" price: "฿1405" currency: THB in_stock: true reviews_count: 13 category: "Fair Rite" url: https://www.desertcart.co.th/products/23272871-toroid-core-ft240-43-ferrite store_origin: TH region: Thailand --- # 43 material mix High permeability 240 mm diameter Toroid Core FT240-43 Ferrite **Brand:** fair-rite **Price:** ฿1405 **Availability:** ✅ In Stock ## Summary > Transform your projects with Toroid Core magic! ✨ ## Quick Answers - **What is this?** Toroid Core FT240-43 Ferrite by fair-rite - **How much does it cost?** ฿1405 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/23272871-toroid-core-ft240-43-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 ## Key Features - • **🔒 Reliable Stability:** Designed to withstand high-frequency operations without degradation. - • **🌍 Eco-Friendly Choice:** Made from sustainable materials, aligning with your green initiatives. - • **🌟 Enhanced Efficiency:** Minimizes energy loss, maximizing your project’s potential. - • **🔧 Precision Engineering:** Crafted for optimal performance in RF applications. - • **📈 Versatile Applications:** Perfect for transformers, inductors, and more—tailored for the modern engineer. ## Overview The Toroid Core FT240-43 Ferrite is a high-performance magnetic core designed for RF applications, featuring a 240 mm diameter and a unique 43 material mix that ensures high permeability and minimal energy loss. Ideal for engineers seeking reliability and efficiency in their designs. ## Description One FT240-43 Toroid Ferrite Core Fair-Rite Bran,d AL=1075 plus or minus 20 percent, uH=(AL x Turns squared)/1000 Wideband, Transformers 5 - 400 MHz, Power Transformers 0.5 - 30 MHz, RFI Suppression 5 - 500 MHz, OD = 2.40 inch / 61.0 mm plus or minus 1.30 mm, ID = 1.40 inch / 35.55 mm plus or minus 0.85 mm, Ht = 0.50 inch / 12.7 mm plus or minus 0.50 mm From bulk packaging, not in retail packaging Review: Not much to say. - Good, works as expected Review: Buy buy buy - Perfect for my projects. I built a transformer for an antenna system with these and they are holding up great, stack 2 or 3 and you'll be set. Great value, easy, and work as intended when used in your project. It knocked out some stray RF on my laptop USB that would disconnect from my radios with every transmission. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0178IA3XU | | Best Sellers Rank | #35,201 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Electronic Ferrites | | Date First Available | October 27, 2015 | | Is Discontinued By Manufacturer | No | | Item Weight | 5.6 ounces | | Item model number | FT240-43 | | Manufacturer | FAIR-RITE | | Product Dimensions | 3 x 1 x 3 inches | ## Images ![Toroid Core FT240-43 Ferrite - Image 1](https://m.media-amazon.com/images/I/51O2dNGYN+L.jpg) ## Questions & Answers **Q: What is the max wattage these are rated for. i want to build an unun for an end fed antenna that will handle 600 watts. will 1 or more handle amount?** A: You should use 2 for 600 watts, the highest rating I have seen for only one is 400 watts. Based on commercial models of end-fed ununs. **Q: I would like to use this on the 11-meters cb band (26.965 - 27.405) will this help to cut down rf returning to the radio?** A: how many watts? 4 watts isn’t anything to worry about but 500+ watts certainly would be. and yes, wound as a 1:1 choke (or they also call them current baluns) it will absolutely lessen common mode current coming back down the coax. coax coils (mentioned in other responses) are not nearly as effective as a 240-31 ferrite core wrapped as a 1:1 current choke. google “1:1 current balun” or “1:1 current choke” and you will see many examples to guide you. balun btw simply means balanced and unbalanced and they are used to rectify the impedance mis-match between the antenna and the 50 ohm coaxial cable. that generally involves lowering the high impedance of an antenna (200-3000 ohms depending on design) and even then, it should be referred to as a step down transformer but balun (balanced / unbalanced) has become the default term. **Q: Will this work to reduce/remove static noise on a regular FM radio produced from cheap led lighting in a garage?** A: It likely would with a couple of ifs. It is really large for such a task. The toroidal core would need to be placed as close to the LED power source as possible. Is the FM radio itself close to the LED lighting? **Q: Will this block interference from a treadmill motor? Ethernet over powerline is degraded whenever the treadmill is on.** A: ethernet over power line is destroying the shortwave radio frequencies , you should run a real cat-5/6 cable or use 5gig wireless.... and you would only need type 73 core for anything the treadmill is hashing out on the airwaves. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Not much to say. *by J***H on March 22, 2026* Good, works as expected ### ⭐⭐⭐⭐⭐ Buy buy buy *by K***K on October 7, 2025* Perfect for my projects. I built a transformer for an antenna system with these and they are holding up great, stack 2 or 3 and you'll be set. Great value, easy, and work as intended when used in your project. It knocked out some stray RF on my laptop USB that would disconnect from my radios with every transmission. ### ⭐⭐⭐⭐⭐ Beware of other brands! Buy these. *by C***M on March 19, 2026* I struggled with the "green 2-pack" ferrites from amazon and i suspected they were defective (i was right) until I ordered two of these. They worked as expected and had low VSWR on the VNA when winding a 49:1 unun and testing into a 2450 ohm resistive load. Other "green" Amazon torroids were unable to achieve any better than 3:1 VSWR! These were 1.5:1 in the same setup. ## Frequently Bought Together - Toroid Core FT240-43 Ferrite - Toroid Core FT240-31 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.co.th/products/23272871-toroid-core-ft240-43-ferrite](https://www.desertcart.co.th/products/23272871-toroid-core-ft240-43-ferrite) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-05-05*