MW 15x4 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010030
GTIN: 5906301810292
Diameter Ø
15 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
5.3 g
Magnetization Direction
↑ axial
Load capacity
3.32 kg / 32.56 N
Magnetic Induction
291.60 mT
Coating
[NiCuNi] nickel
1.968 ZŁ with VAT / pcs + price for transport
1.600 ZŁ net + 23% VAT / pcs
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Advantages and disadvantages of rare earth magnets.
Apart from their consistent power, neodymium magnets have these key benefits:
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
- Thanks to the elegant finish, the coating of nickel, gold-plated, or silver gives an visually attractive appearance,
- Magnets are distinguished by excellent magnetic induction on the surface,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Due to the option of accurate molding and adaptation to custom solutions, neodymium magnets can be manufactured in a variety of shapes and sizes, which amplifies use scope,
- Significant place in modern industrial fields – they are used in computer drives, electromotive mechanisms, medical devices, also complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Drawbacks and weaknesses of neodymium magnets: tips and applications.
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- We suggest a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
- Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these products can complicate diagnosis medical when they are in the body.
- Due to neodymium price, their price is relatively high,
Maximum lifting capacity of the magnet – what contributes to it?
The specified lifting capacity refers to the peak performance, recorded under ideal test conditions, meaning:
- using a sheet made of mild steel, acting as a circuit closing element
- whose transverse dimension is min. 10 mm
- with a plane perfectly flat
- without the slightest air gap between the magnet and steel
- under vertical force vector (90-degree angle)
- at temperature approx. 20 degrees Celsius
Practical aspects of lifting capacity – factors
Bear in mind that the magnet holding will differ depending on elements below, starting with the most relevant:
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Direction of force – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – insufficiently thick plate does not close the flux, causing part of the flux to be escaped to the other side.
- Steel grade – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
- Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate reduces the load capacity.
Precautions when working with neodymium magnets
Heat sensitivity
Do not overheat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Physical harm
Big blocks can smash fingers instantly. Do not put your hand between two strong magnets.
Nickel coating and allergies
Some people experience a contact allergy to nickel, which is the standard coating for neodymium magnets. Prolonged contact might lead to dermatitis. We recommend use protective gloves.
Electronic hazard
Data protection: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, timepieces).
This is not a toy
Absolutely store magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are life-threatening.
Safe operation
Use magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their power.
Beware of splinters
Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.
Implant safety
For implant holders: Powerful magnets affect electronics. Keep at least 30 cm distance or request help to work with the magnets.
Impact on smartphones
An intense magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.
Fire warning
Dust created during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Danger!
More info about risks in the article: Safety of working with magnets.
