MW 8x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010102
GTIN: 5906301811015
Diameter Ø
8 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
5.65 g
Magnetization Direction
↑ axial
Load capacity
6.64 kg / 65.12 N
Magnetic Induction
598.12 mT
Coating
[NiCuNi] nickel
3.44 ZŁ with VAT / pcs + price for transport
2.80 ZŁ net + 23% VAT / pcs
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Strength along with structure of a neodymium magnet can be analyzed using our
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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 NdFeB magnets.
In addition to their pulling strength, neodymium magnets provide the following advantages:
- They retain attractive force for almost ten years – the drop is just ~1% (according to analyses),
- Magnets very well protect themselves against demagnetization caused by external fields,
- Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
- Neodymium magnets achieve maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- In view of the ability of flexible forming and adaptation to individualized requirements, magnetic components can be modeled in a wide range of geometric configurations, which expands the range of possible applications,
- Versatile presence in electronics industry – they are commonly used in mass storage devices, electromotive mechanisms, medical equipment, also multitasking production systems.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Disadvantages of neodymium magnets:
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
- We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex forms.
- Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these products can complicate diagnosis medical after entering the body.
- With mass production the cost of neodymium magnets is economically unviable,
Highest magnetic holding force – what contributes to it?
Magnet power was determined for ideal contact conditions, assuming:
- on a base made of mild steel, perfectly concentrating the magnetic flux
- whose transverse dimension equals approx. 10 mm
- with a plane free of scratches
- under conditions of gap-free contact (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- in stable room temperature
Impact of factors on magnetic holding capacity in practice
In real-world applications, the actual holding force depends on many variables, ranked from the most important:
- Distance (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Plate material – mild steel gives the best results. Alloy steels lower magnetic permeability and lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.
* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.
Precautions when working with NdFeB magnets
Maximum temperature
Monitor thermal conditions. Heating the magnet to high heat will ruin its properties and strength.
Physical harm
Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.
Nickel coating and allergies
Some people suffer from a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching can result in dermatitis. We strongly advise wear safety gloves.
Shattering risk
NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets will cause them breaking into small pieces.
Impact on smartphones
A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Keep magnets near a smartphone to avoid breaking the sensors.
Medical implants
Individuals with a heart stimulator must maintain an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.
Do not underestimate power
Handle magnets with awareness. Their immense force can shock even experienced users. Plan your moves and do not underestimate their force.
Mechanical processing
Powder produced during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Protect data
Equipment safety: Strong magnets can damage payment cards and delicate electronics (heart implants, medical aids, mechanical watches).
This is not a toy
Adult use only. Small elements pose a choking risk, causing serious injuries. Store out of reach of children and animals.
Security!
More info about hazards in the article: Safety of working with magnets.
