---
product_id: 23272871
title: "Toroid Core FT240-43 Ferrite"
brand: "fair-rite"
price: "R384"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Fair Rite"
url: https://www.desertcart.co.za/products/23272871-toroid-core-ft240-43-ferrite
store_origin: ZA
region: South Africa
---

# 43 material mix High permeability 240 mm diameter Toroid Core FT240-43 Ferrite

**Brand:** fair-rite
**Price:** R384
**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?** R384 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/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: It's a Toroid - It's a Toroid, it works, good price, I'm happy
Review: Good Quality Toroid - Works well in coaxial RF choke for 20 thru 6 meters.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0178IA3XU |
| Best Sellers Rank | #32,795 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 | 4.2 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

### ⭐⭐⭐⭐⭐ It's a Toroid
*by K***. on February 4, 2026*

It's a Toroid, it works, good price, I'm happy

### ⭐⭐⭐⭐⭐ Good Quality Toroid
*by R***K on October 18, 2025*

Works well in coaxial RF choke for 20 thru 6 meters.

### ⭐⭐⭐⭐⭐ 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.

## Frequently Bought Together

- Toroid Core FT240-43 Ferrite
- Toroid Core FT240-31 Ferrite
- FT-140-43 Ferrite Toroid Core | 43 Material

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-21*