FT-240-43 FT240-43 Ferrite Toroid Core 43 Material

FT-240-43 FT240-43 Ferrite Toroid Core 43 Material

Q: Are the north and south poles, axially (top and bottom) or diametrically (side to side)?

Your question indicates that you assume this product is a magnet. This product is not a magnet. It is a ferrite core used to construct impedance matching transformers by winding wires repeatedly through the center and tightly wrapped around the edges of core.

Q: works for dash cam radio interference???

You can use the clip on type for that as well. Get good ones, not unknown cheap chinese.

Q: Would this help with noise on AM radio? Wrap the antenna wire around and through this?

If the antenna wire is just that a wire then you will only decrease the signal and the noise. Find the source of the noise. LED lights, wall plug-in power sources, or other electrical appliances. If you find the source then maybe using snap on ferrite cores. They see these on Amazon also. I found a source for my AM noise was a power supply for a blue tooth adapter I had. After unplugging this the noise went away. If you shield the antenna as using coax and running an outside antenna wire to get away from the noise that might work also, but that depending where you live might not be possible.

Q: what is the dimater of the inner hole?

I don't have an ID micrometer handy but an eyeball guess with a desk ruler is about 1 3/8 inch. If you need something more precise or in metric, I can figure that tomorrow.

Product ID: 157872753

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⚡Supports up to 1 kW power handling

📏2.4" OD × 1.4" ID × 0.5" height

📡Effective RFI suppression 20-250 MHz

Frequently Bought Together

FT-240-43 FT240-43 Ferrite Toroid Core 43 Material

BNTECHGO 16 AWG Magnet Wire - Enameled Copper Wire - Enameled Magnet Winding Wire - 4 oz - 0.0492" Diameter 1 Spool Coil Red Temperature Rating 155℃ Widely Used for Transformers Inductors

FT-140-43 Ferrite Toroid Core | 43 Material

Description

🔧 Power your RF projects with precision and reliability — don’t let interference hold you back!

HIGH POWER READY - Handles up to 1 kW, perfect for demanding HF baluns and impedance transformers.
BROADBAND RFI SUPPRESSION - Mix 43 material targets 20-250 MHz range, crushing interference for crystal-clear signals.
THERMALLY STABLE PERFORMANCE - Maintains consistent operation under high temperature and load conditions.
MULTI APPLICATION FLEXIBILITY - Ideal for 1:1, 4:1, 9:1 baluns, common-mode chokes, and antenna noise suppression.
PRECISION LARGE CORE DIMENSIONS - Spacious 2.4" OD toroid fits multiple RG-8 or RG-213 turns for versatile winding options.

The FT-240-43 Ferrite Toroid Core by Fair-Rite is engineered with Mix 43 ferrite material to deliver superior RFI suppression across 20-250 MHz. Its large 2.4" outer diameter and high initial permeability (µi ≈ 850) enable multiple wire turns, supporting high-power applications up to 1 kW. Designed for HF baluns, impedance transformers, and EMI filtering, it offers excellent thermal stability and versatile use in various RF and antenna configurations.

Have a Question? See What Others Asked

Are the north and south poles, axially (top and bottom) or diametrically (side to side)?

works for dash cam radio interference???

Would this help with noise on AM radio? Wrap the antenna wire around and through this?

what is the dimater of the inner hole?

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