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Neodymium Ring Magnet - 20mm (OD) x 12.7mm (H) x 4mm (ID)

Product code: 23014

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Neodymium Ring Magnet - 20mm (OD) x 12.7mm (H) x 4mm (ID)

Rated 5.0 out of 5
Based on 1 review
Product Code 23014
Pull Force* 11.8 kg
Weight 28 gm
Style Rare Earth Ring magnet
Gauss 5475
Grade N38
Tolerance +/- 0.05mm
Coating Nickel (NiCuNi)
Direction of Magnetisation Axially magnetised thru the 12.7mm
Dimensions Inside Diameter:4mm, Outside Diameter:20mm, Thickness:12.7mm
*Measured against up to 10mm mild steel.
Neodymium Ring Magnet - 20mm (OD) x 12.7mm (H) x 4mm (ID)

Magnetic Product Description:

This Rare Earth ring magnet has an outside diameter of 20mm, an inside diameter of 4mm, and a height (or thickness) of 12.7mm. It has a pull force of 11.8 kilograms. It is identified by the AMF Magnetics part number 23014.

Uses for our Rare Earth Ring Magnets:

When designers and makers of wheels hear someone say, “We're not trying to re-invent the wheel here”, they beg to differ. Often with the assistance of neodymium ring 20mmx12.7mmx4mm magnets in their wheel, caster and roller assemblies, re-inventing the wheel is exactly what they are doing.

People keep inventing machines and equipment that needs to be moved safely and securely. When the first cave men and women stood around marvelling at the first circle chiselled from a lump of stone they could hardly have been expected to then turn their attention to creating casters for the giant sight screens at cricket stadiums; or super rollers for tunnel boring machines.

Wheels and castor wheels, (swivelling wheels to enhance stability) and rollers often engage ring magnets to assist in the smooth transit of people, goods and equipment. Huge tunnel boring machines and giant sight screens at cricket stadiums run along horizontal tracks using super strength casters or rollers often with the assistance of magnets of different types.

Hospital beds, office chairs, factory equipment, drum, tub and piano dollies, all require safe transit with the assistance of purpose built wheel, caster or roller assemblies. The type of wheel, castor or roller is determined by the size, weight and surface type the cargo will be travelling over.

Ring magnets, housed on the axle, rod or spool of some of these arrangements help control movement of weighty items with their predictable and intuitive hold and release force field. The engagement of magnets, including ring magnets, allows for a more controlled, smoother start and stop to the wheel assemblies reducing the risk of collisions or other accidents and increasing the durability of the assemblies themselves.

These powerful ring magnets are used widely in agriculture, construction, heavy engineering and shipping industries.

average rating 5.0 out of 5
Based on 1 review
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100% of reviewers would recommend this product to a friend
1 Review
Reviewed by dick w.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

all good

they did the job beautifully and so strong

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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.