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.

works for dash cam radio interference???

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

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.

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.

Ft 240 43 Ferrite Toroid Core Mix 43 For Rfi

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Description

🔧 Elevate your RF game with the FT-240-43 – where power meets precision!

POWERHOUSE PERFORMANCE - Handles up to 1 kW, perfect for high-power HF baluns and impedance transformers.
BROADBAND RFI SUPPRESSION - Engineered for 20-250 MHz range to crush interference and boost signal clarity.
BUILT TO LAST UNDER PRESSURE - Thermally stable design keeps performance consistent in demanding environments.
PRECISION SIZED FOR MAXIMUM FLEXIBILITY - Generous 2.4" outer diameter fits multiple RG-8, RG-213, or speaker wire turns with ease.
HIGH PERMEABILITY FOR SUPERIOR FILTERING - Mix 43 material with µi ≈ 850 ensures strong attenuation with minimal signal loss.

The FT-240-43 Ferrite Toroid Core by Fair-Rite is a high-permeability Mix 43 ferrite designed for effective RFI suppression and HF balun construction. With a large 2.4" outer diameter, it supports multiple wire turns and handles up to 1 kW power, making it ideal for RF engineers and hobbyists targeting 20-250 MHz frequency ranges. Its thermal stability and broad application versatility ensure reliable, high-performance EMI filtering and impedance transformation.

Specifications

ASIN	B07Y6NQRGF
Best Sellers Rank	#62,099 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #14 in Electronic Ferrites
Date First Available	September 21, 2019
Item Weight	4.2 ounces
Manufacturer	FRP
Package Dimensions	4.02 x 3.19 x 1.61 inches

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