UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread
magnetic holder rubber internal thread
Catalog no 160305
GTIN: 5906301813637
Diameter Ø
29 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
18 g
Load capacity
6.4 kg / 62.76 N
8.61 ZŁ with VAT / pcs + price for transport
7.00 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
Advantages as well as disadvantages of neodymium magnets.
Besides their immense strength, neodymium magnets offer the following advantages:
- They do not lose magnetism, even after nearly ten years – the drop in strength is only ~1% (theoretically),
- Magnets very well protect themselves against demagnetization caused by foreign field sources,
- The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to look better,
- Magnets possess maximum magnetic induction on the working surface,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of accurate forming and modifying to complex conditions,
- Key role in modern industrial fields – they find application in computer drives, electromotive mechanisms, diagnostic systems, also complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions
Disadvantages of neodymium magnets:
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing threads and complex forms in magnets, we propose using casing - magnetic mount.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical in case of swallowing.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Highest magnetic holding force – what it depends on?
Holding force of 6.4 kg is a theoretical maximum value performed under the following configuration:
- using a base made of mild steel, serving as a ideal flux conductor
- whose thickness equals approx. 10 mm
- with a plane perfectly flat
- under conditions of ideal adhesion (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- at temperature room level
Practical lifting capacity: influencing factors
In real-world applications, the real power is determined by several key aspects, listed from crucial:
- Clearance – the presence of any layer (rust, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Base massiveness – 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 pure iron steel. Stainless steels may attract less.
- Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Thermal environment – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.
* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.
H&S for magnets
Life threat
Individuals with a ICD must keep an large gap from magnets. The magnetic field can disrupt the functioning of the life-saving device.
Threat to navigation
An intense magnetic field disrupts the functioning of compasses in phones and navigation systems. Keep magnets near a device to avoid damaging the sensors.
Fragile material
NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets leads to them shattering into small pieces.
Sensitization to coating
Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.
Crushing risk
Danger of trauma: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.
Data carriers
Device Safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).
Caution required
Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Choking Hazard
NdFeB magnets are not suitable for play. Eating a few magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.
Fire risk
Dust created during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
Operating temperature
Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Security!
Looking for details? Check our post: Why are neodymium magnets dangerous?
