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 Ft 240 43 Ft240 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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R1259

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your circuits with precision and speed!

ROBUST BUILD QUALITY - Durable ferrite material designed for reliable power and RFI transformer use
FAST SHIPPING FROM USA - Get your components quickly and stay ahead in your projects
SUPERIOR MAGNETIC PROPERTIES - High AL value ensures efficient inductance and minimal signal loss
PRECISION ENGINEERED DIMENSIONS - 2.4 inch outer diameter with tight tolerances for consistent performance
VERSATILE FREQUENCY COMPATIBILITY - Operates seamlessly from 0.5 MHz up to 500 MHz for diverse applications

The Amidon FT-240-43 Ferrite Toroid Core is a large 2.4-inch core designed for wideband transformers, power transformers, and RFI suppression across 0.5 to 500 MHz. Featuring a high AL value of 1075 ±20%, it delivers efficient inductance with consistent dimensions, making it ideal for professional-grade electronic applications. Ships fast from California, USA.

Specifications

ASIN	B07Y6NQRGF
ASIN	B07Y6NQRGF
Batteries Included?	No
Batteries Required?	No
Date First Available	3 March 2023
Date First Available	3 March 2023
Item Package Quantity	1
Item Weight	118 g
Manufacturer	Amidon
Manufacturer	Amidon
Manufacturer reference	FT-240-43
Manufacturer reference	FT-240-43
Measurement System	English
Package Dimensions	10.21 x 8.1 x 4.09 cm; 118 g
Package Dimensions	10.21 x 8.1 x 4.09 cm; 118 g
Part number	FT-240-43

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