Product code: 23005BNth
Leading Magnet Supplier
Shipping Worldwide*
30 Day Returns
Same Day Dispatch*
This Rare Earth Countersunk Ring Magnet has an outside diameter of 25mm, an inside diameter of 12mm to 6mm and a thickness of 10mm. It has a pull force of 15.8kg. It is identified by the AMF magnet part number 23005BNth.
This type of Neodymium Ring magnet has a central void that allows it to be attached to another surface with a countersunk, flat head screw. These surfaces can include timber, masonry, aluminium and other ferrous and non-ferrous materials. The countersunk fixing hole determines which side of the magnet is attached to a surface and also which magnetic pole is exposed. In the case of this item, it is North. Once attached, the ring magnet can then bond with a metal plate or steel washer that has been attached to a different surface.
This AMF product can also be purchased with an opposing South facing pole that will also be attracted when attached to another surface. Two ring magnets with opposing poles can be screwed into place on different surfaces so they can bond with each other magnetically.
Whether you use this countersunk ring magnet to attract a metal plate, a steel surface or an identical ring magnet with an opposite South pole, the bond will be strong and reliable. However, Neodymium material is inherently brittle and will crack if screwed into position too tightly or when the magnets or surfaces are allowed to collide together. Ideally, this type of magnet should be recessed into timber or similar type of surface at a depth greater than 10mm so the timber protects it from direct contact or impact damage when the opposing surfaces bind together. Used in this way, the magnets are suitable for doorstops, holding and storing tools and equipment, timber cabinetry closure systems and many other applications where a magnetic hold is desirable but metal surfaces are absent.
Neodymium ring magnets that screw into position are practical tools that are found in many environments including agriculture, manufacturing, transport, skilled trades, construction and even the arts.
No FAQ available
NB: Ranges are indicative for product category, please check individual products for specic values within that range.
The most common coating for Neodymium magnets is Nickel + Copper + Nickel (Ni + Cu + Ni). This coating offers the magnet relatively good protection from corrosion and passive applications. If the magnet will be exposed to moisture or liquid then consider the use of an organic coating such as Epoxy. A hard wearing coating, Epoxy is suited to applications where the magnet will come under some friction or knocking.
Magnets are readily available in Blocks, Discs, Cylinders & Rings. AMF Magnetics specializes in the supply of short-run prototype magnets including Arc Segments, various magnetic orientations etc. If you need a magnet size that we don't carry in stock, submit a Design-a-Magnet enquiry for a quote on your custom magnet design.
Neodymium magnets are offered in several different grades. The first section N30-54 has an operating temperature of up to 80 degrees. Most of our stock only goes up to N38. The second section, denoted with the "M" prefix after the grade has an operating temperature 100 degrees. After this the grades are "H", "SH", "UH" & "EH". In order for the magnet to withstand a higher operating temperature, during production more of the raw material PrNd is incorporated as these elements have a naturally occurring resistance to high temperatures.
The Pull Force listed for each magnet is based on lifting 10mm thick steel from a horizontal surface. Magnets on a vertical surface (of 10mm thick steel) are generally able to hold around only 30% of the pull force listed in the product description. This is due to the effects of gravity and the lack of friction between the surface and the shiny magnet. Read More
