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Toroid Core FT240-31 Ferrite
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Toroid Core FT240-31 Ferrite

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To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.Learn more how customers reviews work on Amazon






Customers say

Customers find the ferrite core works well, with one mentioning its effectiveness in common mode chokes and another noting its performance in 4:1 baluns. Moreover, the product receives positive feedback for its quality and value, with customers appreciating its good price. Additionally, customers praise its compatibility, with one highlighting its suitability for HF ham radio feedlines. However, opinions on noise reduction are mixed, with some customers reporting noticeable noise reduction while others mention interference issues.

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22 customers mention functionality, 20 positive, 2 negative

Customers find that the ferrite core works well, with one customer specifically noting its effectiveness in filtering out common mode RFI and another mentioning its success in a 4:1 balun configuration.

Worked great and went back and ordered moreRead more

…It is smooth. It is round. And it does a great job on a 4:1 balun with another just like it when wrapped with 12 turns of 14 gauge wire….Read more

Bought it for a getaway trip. Works great hanging from a dipole in winter in Michigan. High quality. Would buy again. PRead more

…These cores fixed the issue! I wish they were sold with prime shipping but still worth the wait/extra bucks for shipping.Read more

19 customers mention quality, 19 positive, 0 negative

Customers find the ferrite core to be of good quality, with one customer noting it works well for making Baluns and another mentioning its effectiveness as an RF killer.

Toroids were packed well, and appear to be good quality. They're cheaper elsewhere though for exact same product, so taking off one star for that.Read more

Took care of all my issues I was having with my usb cord on FT8. Great productRead more

VERY GOOD. I USED IT FOR MY SAMSUNG TABLET POWER CABLE. IT WORKED THEN IT DIDNT SO I THINK INTERFERENCE IS COMING FROM AN ADDITIONAL DEVICE.Read more

Good product!Read more

8 customers mention value for money, 7 positive, 1 negative

Customers find the ferrite core to be good value for money, with one customer noting excellent performance relative to the price.

It's a Toroid, it works, good price, and just what I needed. I'm happyRead more

…The price is fair as well.Read more

…By at least an S unit. Easy install and much less expensive than many factory products on the market.Read more

…I feel the price point is great and they appear to be high quality components.Read more

7 customers mention compatibility, 6 positive, 1 negative

Customers find the toroid core compatible with various applications, with one mentioning it works well with 160m horizontal loops and another noting its effectiveness for HF ham radio feedlines.

…Mix #43 is acceptable for baluns through upper HF, but if you’re including 80m or lower use #31.Read more

…Great with my 160m horizontal loop.Read more

A really great price for a toroid that is perfect for HF ham radio feedlinesRead more

Perfect for the cable from my Yaesu to my computerRead more

13 customers mention noise level, 9 positive, 4 negative

Customers have mixed experiences with the ferrite core's noise reduction capabilities, with some reporting noticeable reduction and complete elimination of interference, while others note no improvement.

…turn through this device and reconnected it and vola that was the end of the noise. Now one thing you must keep in mind for this to work, you…Read more

it did the trick and got rid of my 80 meter hum into a my VHF rig remote speaker and my remote scanner speaker. I will be ordering more of these.Read more

…IT WORKED THEN IT DIDNT SO I THINK INTERFERENCE IS COMING FROM AN ADDITIONAL DEVICE.Read more

Used to make a common mode choke for HF antenna. Reduced power line noise that apparently is coming in through the feed line from S5 to S1.Read more


Great performing toroids for HF common mode chokes!

5 out of 5 stars

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!
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Top reviews from the United States

  • Jay Tee

    5 out of 5 stars

    Great for noise reduction

    Reviewed in the United States on March 23, 2026

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    I use this to create a common mode current balun filter on my HF ham radio to reduce the noise level and RF coming back into my radio shack.
    It works great on the frequencies that it's designed for and I also purchased another one (FT-240-43) for my VHF radio and they both work great.
    Make sure you put at least 10 turns on the coax through the toroid and you should be okay.
    I feel the price point is great and they appear to be high quality components.
    2 people found this helpful

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  • Ken K.

    5 out of 5 stars

    I'm happy

    Reviewed in the United States on February 4, 2026

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    It's a Toroid, it works, good price, and just what I needed. I'm happy

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  • Janet S.

    5 out of 5 stars

    A really great price for a toroid that is perfect for HF ham radio feedlines

    Reviewed in the United States on January 26, 2024

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    I have purchased several FT-240-31 toroids in the past and always paid a little more. Looking at other reviews it seems, like me, people find these very useful and of good quality but thought they were a bit pricey. In my opinion, however, this seller removed any reason not to give five stars by lowering their price (below what I paid even three years ago). If you are a radio operator & use flexible coaxial cable, like RG-8X or RG-58, to feed your antennas then you are going to love these! Just pass the antenna connector (ex. PL-259) and at least 2' of cable up through the middle of the toroid and use a vinyl cable tie to secure the toroid to the cable so it can't slide. Then, repeat the process of passing the connector/plug up through the center nine more times, winding counter clockwise until you have ten tight loops around the donut. Finally just secure the cable to the toroid body as it exits the 10th time with another cable tie and "Voila", you now have an choke that will keep stray RF energy from using your feedline to interfere with your station equipment and cause noise. Just FYI the "240" describes the size of the donut and you need one this big to work with coaxial cable the size of RG-8X with PL-259 connectors, and the 31 mix is perfect for use with all the HF bands up to 30 MHz.
    21 people found this helpful

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  • Randall

    5 out of 5 stars

    Great Product, Great Service, and even in an imperfect environment, Greater Reliability.

    Reviewed in the United States on November 1, 2021

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    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
    20 people found this helpful

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  • Allan R. Vosburgh

    5 out of 5 stars

    On time.

    Reviewed in the United States on May 4, 2026

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    Came on time, was as advertised.

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  • Jennifer Edson

    4 out of 5 stars

    buy extra's to be safe if possible, but they do work!

    Reviewed in the United States on November 25, 2025

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    i ordered 5 of them because i seen other reviews of how some came broken, as expected 1 out of my 5 was broken, thankfully only 1, they need to up their packaging, HOWEVER the ones that was not broke do make a difference

    buy extra's to be safe if possible, but they do work!
    buy extra's to be safe if possible, but they do work!

    Jennifer Edson

    4 out of 5 stars

    buy extra's to be safe if possible, but they do work!

    Reviewed in the United States on November 25, 2025

    i ordered 5 of them because i seen other reviews of how some came broken, as expected 1 out of my 5 was broken, thankfully only 1, they need to up their packaging, HOWEVER the ones that was not broke do make a difference

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  • michael ambrose

    5 out of 5 stars

    Great product

    Reviewed in the United States on January 16, 2026

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    Quick delivery. Exactly what I needed and received.

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  • southwest

    5 out of 5 stars

    Great

    Reviewed in the United States on April 11, 2026

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    Great

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Top reviews from other countries

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  • Jean-Marie
    5 out of 5 stars
    conforme
    Reviewed in France on October 7, 2025

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    Parfait, mais je le garde en stock car mon projet a changé 🙂

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  • Bosaro Andrea
    2 out of 5 stars
    Un po' deluso
    Reviewed in Italy on April 20, 2026

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    Acquistato per la costruzione di un balun 1:1 per eliminare le correnti di modo comune verso il trasmettitore. Anche se il balun è stato ben costruito, rispettando il giusto collegamento, il balun non funziona molto bene. Forse il toroide non è di grande qualità.

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  • Fredy
    5 out of 5 stars
    Excelente
    Reviewed in Mexico on August 28, 2024

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    Excelente y de Muy buena calidad solo falta probarlo para lo que fue echó

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  • Josh
    5 out of 5 stars
    Good
    Reviewed in the United Kingdom on February 12, 2026

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    Works as intended

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  • Dürchke
    5 out of 5 stars
    Great quality, effective toroid
    Reviewed in Canada on December 20, 2025

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    Very good quality mix 31 toroid. For reference, I used this to make a RF choke. Reduced noise around 7 Mhz, 14 Mhz and above, especially on harmonics of 6-7Mhz where a lot of RFI originates.

    Also for a reference of its diameter, I was able to very very comfortably wind an RG8X coaxial cable 12 times though it with the PL259 connector attached to it (so the connector and the cable went through the toroid 12 times).

    Great quality, effective toroid

    Dürchke

    5 out of 5 stars
    Great quality, effective toroid
    Reviewed in Canada on December 20, 2025

    Very good quality mix 31 toroid. For reference, I used this to make a RF choke. Reduced noise around 7 Mhz, 14 Mhz and above, especially on harmonics of 6-7Mhz where a lot of RFI originates.

    Also for a reference of its diameter, I was able to very very comfortably wind an RG8X coaxial cable 12 times though it with the PL259 connector attached to it (so the connector and the cable went through the toroid 12 times).

    Sending feedback…

    Thanks, we'll investigate in the next few days.

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Product Summary: Toroid Core FT240-31 Ferrite

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Toroid Core FT240-31 Ferrite
Toroid Core FT240-31 Ferrite

$9.92

Buy Now
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