MP 30x6x10 / N38 - ring magnet
ring magnet
Catalog no 030197
GTIN: 5906301812142
Diameter [±0,1 mm]
30 mm
internal diameter Ø [±0,1 mm]
6 mm
Height [±0,1 mm]
10 mm
Weight
56.55 g
Magnetization Direction
↑ axial
Load capacity
3.42 kg / 33.54 N
Magnetic Induction
248.80 mT
Coating
[NiCuNi] nickel
16.00 ZŁ with VAT / pcs + price for transport
13.01 ZŁ net + 23% VAT / pcs
bulk discounts:
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Pros as well as cons of rare earth magnets.
In addition to their long-term stability, neodymium magnets provide the following advantages:
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
- Neodymium magnets are distinguished by remarkably resistant to demagnetization caused by external field sources,
- Thanks to the metallic finish, the plating of nickel, gold-plated, or silver gives an clean appearance,
- They show high magnetic induction at the operating surface, which improves attraction properties,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of detailed shaping and modifying to concrete applications,
- Versatile presence in innovative solutions – they serve a role in magnetic memories, electric drive systems, diagnostic systems, also modern systems.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
What to avoid - cons of neodymium magnets: application proposals
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
- Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in realizing threads and complicated forms in magnets, we propose using a housing - magnetic mechanism.
- Possible danger to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities
Maximum holding power of the magnet – what it depends on?
Magnet power is the result of a measurement for the most favorable conditions, assuming:
- on a plate made of mild steel, optimally conducting the magnetic flux
- whose transverse dimension equals approx. 10 mm
- with an polished touching surface
- under conditions of no distance (surface-to-surface)
- under perpendicular force direction (90-degree angle)
- in temp. approx. 20°C
Magnet lifting force in use – key factors
Holding efficiency impacted by working environment parameters, such as (from most important):
- Gap (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
- Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
- Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.
Precautions when working with NdFeB magnets
Do not overheat magnets
Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and strength.
Compass and GPS
Note: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, device, and navigation systems.
Magnet fragility
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Allergic reactions
A percentage of the population have a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling can result in an allergic reaction. We suggest wear protective gloves.
Physical harm
Large magnets can smash fingers instantly. Do not put your hand between two attracting surfaces.
Health Danger
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Handling guide
Handle magnets with awareness. Their immense force can shock even experienced users. Stay alert and respect their force.
Do not drill into magnets
Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
Threat to electronics
Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.
Danger to the youngest
Product intended for adults. Small elements pose a choking risk, leading to intestinal necrosis. Store away from kids and pets.
Danger!
Want to know more? Check our post: Are neodymium magnets dangerous?
