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
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Pros and cons of NdFeB magnets.
In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- They are resistant to demagnetization induced by external field influence,
- Thanks to the elegant finish, the plating of Ni-Cu-Ni, gold, or silver gives an visually attractive appearance,
- Magnetic induction on the working layer of the magnet turns out to be impressive,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
- Thanks to freedom in designing and the capacity to modify to unusual requirements,
- Key role in modern industrial fields – they are used in mass storage devices, electromotive mechanisms, advanced medical instruments, also multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Disadvantages of NdFeB magnets:
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of producing nuts in the magnet and complex shapes - recommended is casing - magnet mounting.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Maximum magnetic pulling force – what affects it?
Holding force of 3.42 kg is a theoretical maximum value executed under standard conditions:
- with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
- with a cross-section of at least 10 mm
- with a plane free of scratches
- under conditions of gap-free contact (surface-to-surface)
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Determinants of practical lifting force of a magnet
Please note that the working load will differ influenced by elements below, in order of importance:
- Distance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost into the air.
- Metal type – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance {between} the magnet and the plate reduces the holding force.
Warnings
Machining danger
Combustion risk: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.
Serious injuries
Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!
Electronic devices
Do not bring magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Protective goggles
Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
Allergic reactions
It is widely known that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent direct skin contact or opt for encased magnets.
Medical interference
Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
Operating temperature
Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.
Impact on smartphones
Remember: rare earth magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and GPS.
Handling rules
Handle with care. Neodymium magnets attract from a distance and connect with huge force, often faster than you can move away.
Danger to the youngest
These products are not intended for children. Eating multiple magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires immediate surgery.
Important!
Want to know more? Read our article: Are neodymium magnets dangerous?
