---
product_id: 444766783
title: "Toroid Core FT240-43 Ferrite"
brand: "fair-rite"
price: "€ 47.27"
currency: EUR
in_stock: true
reviews_count: 5
category: "Fair Rite"
url: https://www.desertcart.sk/products/444766783-toroid-core-ft240-43-ferrite
store_origin: SK
region: Slovakia
---

# High inductance: AL=1075 ±20% Precision dimensions: OD 2.40in ±1.3mm Wideband frequency: 5-500 MHz range Toroid Core FT240-43 Ferrite

**Brand:** fair-rite
**Price:** € 47.27
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your circuits with precision power – don’t get left behind!

## Quick Answers

- **What is this?** Toroid Core FT240-43 Ferrite by fair-rite
- **How much does it cost?** € 47.27 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/444766783-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

- • **Compact Yet Powerful:** Lightweight 118g core with a sleek 2.4-inch diameter fits perfectly in professional-grade electronic assemblies.
- • **Optimized Inductance:** AL value of 1075 ±20% delivers consistent magnetic properties for reliable signal integrity.
- • **Trusted Brand Quality:** Manufactured by Fair-Rite in the USA, guaranteeing durability and industry-grade standards.
- • **Engineered for Precision:** Exact OD, ID, and height tolerances ensure seamless integration in your custom transformers.
- • **Wideband Frequency Mastery:** Supports RFI suppression and power transformers across 5-500 MHz for versatile, high-performance applications.

## Overview

The Toroid Core FT240-43 Ferrite by Fair-Rite is a precision-engineered magnetic core designed for wideband transformers and RFI suppression across 5 to 500 MHz. With tight dimensional tolerances and a high AL value of 1075 ±20%, it ensures consistent inductance and superior performance in professional electronic applications. Made in the USA, this compact 118g core is a trusted choice for engineers demanding reliability and efficiency.

## 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: El producto llego en buenas condiciones, despues de construir el transformador funiona a la perfeccion gracias desertcart.
Review: It's a Toroid, it works, good price, I'm happy

## Features

- FT240-43
- Ferrite

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0178IA3XU |
| Are batteries included? | No |
| Best Sellers Rank | #151,152 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #59 in Ferrite Cores #15,392 in Lab & Scientific Products |
| Brand | FAIR-RITE |
| Colour | red-500 |
| Country of Origin | USA |
| Customer Reviews | 4.6 4.6 out of 5 stars (421) |
| Date First Available | 23 December 2016 |
| Item Dimensions LxWxH | 7.6 x 2.5 x 7.6 Centimeters |
| Item Height | 3 Inches |
| Item Weight | 118 g |
| Item Width | 1 Inches |
| Item model number | FT240-43 |
| Manufacturer | FAIR-RITE |
| Model number | FT240-43 |
| Noise Level | 30 Decibels |
| Number of Memory Sticks | 1 |
| Product Dimensions | 7.62 x 2.54 x 7.62 cm; 118 g |

## Images

![Toroid Core FT240-43 Ferrite - Image 1](https://m.media-amazon.com/images/I/51O2dNGYN+L.jpg)
![Toroid Core FT240-43 Ferrite - Image 2](https://m.media-amazon.com/images/I/71UoCTEFrML.jpg)
![Toroid Core FT240-43 Ferrite - Image 3](https://m.media-amazon.com/images/I/51kXAhKSMjL.jpg)
![Toroid Core FT240-43 Ferrite - Image 4](https://m.media-amazon.com/images/I/61JpufZiS-L.jpg)
![Toroid Core FT240-43 Ferrite - Image 5](https://m.media-amazon.com/images/I/61EdXU6FK4L.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

### ⭐⭐⭐⭐⭐ Review
*by S***. on 28 August 2024*

El producto llego en buenas condiciones, despues de construir el transformador funiona a la perfeccion gracias Amazon.

### ⭐⭐⭐⭐⭐ Review
*by K***. on 4 February 2026*

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

### ⭐⭐⭐⭐⭐ Review
*by G***. on 7 February 2026*

Excellent genuine FT240-43 Ferrite Cores, good fast delivery as well,recommended purchase.

## 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 Slovakia*
*Store origin: SK*
*Last updated: 2026-03-02*