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.

Amidon Ft240 43 Ft 240 43 Ferrite Toroid Core 43

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

🌀 Elevate your circuits with precision and power – don’t get left behind!

FAST USA SHIPPING - Ships quickly from California, ensuring your projects stay on schedule and ahead of the curve.
ROBUST FERRITE MATERIAL - Material 43 composition optimized for low loss and high Q factor in demanding electronic applications.
HIGH MAGNETIC PERMEABILITY - AL value of 1075 ±20% delivers superior inductance for efficient power and signal management.
PRECISION ENGINEERED DIMENSIONS - 2.4-inch outer diameter ensures consistent, reliable coil winding every time.
VERSATILE FREQUENCY PERFORMANCE - Operates seamlessly across 5 to 500 MHz, perfect for wideband transformers and RFI suppression.

The Amidon FT-240-43 Ferrite Toroid Core is a 2.4-inch diameter, high-permeability core designed for wideband transformers, power transformers, and RFI suppression across 5 to 500 MHz. With a high AL value of 1075 ±20%, it offers reliable inductance performance, crafted from premium Material 43 ferrite. Ideal for professionals demanding precision and efficiency, it ships fast from California to keep your projects moving.

Specifications

Asin	B07Y6NQRGF
Best Sellers Rank	174,570 in Business, Industry & Science (See Top 100 in Business, Industry & Science) 164 in Ferrite Cores
Guaranteed Software Updates Until	unknown
Manufacturer	Amidon
Manufacturer Reference	FT-240-43
Package Dimensions	10.21 x 8.1 x 4.09 cm; 118 g

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