---
product_id: 444766783
title: "Toroid Core FT240-43 Ferrite"
brand: "fair-rite"
price: "$47.14"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/444766783-toroid-core-ft240-43-ferrite
store_origin: US
region: United States of America
---

# High AL value: 1075 ±20% for efficient inductance Precision dimensions: OD 2.40in, ID 1.40in, Ht 0.50in Wideband frequency range: 5-500 MHz Toroid Core FT240-43 Ferrite

**Brand:** fair-rite
**Price:** $47.14
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your electronics with precision-tuned power!

## Quick Answers

- **What is this?** Toroid Core FT240-43 Ferrite by fair-rite
- **How much does it cost?** $47.14 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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 robust magnetic properties for efficient circuit design
- • **Premium USA-made quality:** Fair-Rite brand reliability trusted by professionals worldwide
- • **High inductance stability:** AL=1075 ±20% ensures consistent performance across projects
- • **Wideband frequency versatility:** Optimized for 5-500 MHz applications including RFI suppression and transformers
- • **Precision-engineered dimensions:** Fits seamlessly into your custom RF and power transformer designs

## Overview

The Toroid Core FT240-43 Ferrite by Fair-Rite is a precision-manufactured magnetic core designed for wideband transformers and RFI suppression across 5-500 MHz. With exacting dimensions and a high AL value of 1075 ±20%, it delivers stable inductance performance. Made in the USA, this compact 118g core is ideal for professional-grade RF and power transformer applications.

## 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

## Features

- FT240-43
- Ferrite

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | FAIR-RITE |
| Manufacturer | FAIR-RITE |
| Country of Origin | USA |
| Model number | FT240-43 |
| Colour | red-500 |
| Number of Memory Sticks | 1 |
| Item Weight | 118 g |
| Product Dimensions | 7.62 x 2.54 x 7.62 cm; 118 g |
| Item model number | FT240-43 |
| Item Height | 3 Inches |
| Item Width | 1 Inches |
| Noise Level | 30 Decibels |
| Are batteries included? | No |

## Images

![Toroid Core FT240-43 Ferrite - Image 1](https://m.media-amazon.com/images/I/51tFfQ67bZL.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.

## 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 United States of America*
*Store origin: US*
*Last updated: 2026-02-22*