UMC 20x6/3x7 / N38 - cylindrical magnetic holder
cylindrical magnetic holder
Catalog no 320407
GTIN: 5906301814634
Diameter [±0,1 mm]
20 mm
internal diameter Ø [±0,1 mm]
6/3 mm
Height [±0,1 mm]
7 mm
Weight
12 g
Load capacity
6 kg / 58.84 N
Coating
[NiCuNi] nickel
6.99 ZŁ with VAT / pcs + price for transport
5.68 ZŁ net + 23% VAT / pcs
bulk discounts:
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UMC 20x6/3x7 / N38 - cylindrical magnetic holder
Magnetic properties of material N38
Physical properties of NdFeB
Shopping tips
Advantages as well as disadvantages of neodymium magnets NdFeB.
Besides their magnetic performance, neodymium magnets are valued for these benefits:
- They virtually do not lose power, because even after ten years, the performance loss is only ~1% (based on calculations),
- They protect against demagnetization induced by surrounding magnetic fields effectively,
- The use of a mirror-like silver surface provides a smooth finish,
- The outer field strength of the magnet shows advanced magnetic properties,
- With the right combination of magnetic alloys, they reach excellent thermal stability, enabling operation at or above 230°C (depending on the form),
- Thanks to the possibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in various configurations, which expands their usage potential,
- Key role in advanced technical fields – they are utilized in HDDs, electric motors, medical equipment or even high-tech tools,
- Thanks to their efficiency per volume, small magnets offer high magnetic performance, while occupying minimal space,
Disadvantages of NdFeB magnets:
- They may fracture when subjected to a sudden impact. If the magnets are exposed to shocks, it is advisable to use in a steel housing. The steel housing, in the form of a holder, protects the magnet from damage while also strengthens its overall resistance,
- Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible magnetic decay (influenced by the magnet’s dimensions). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
- They rust in a wet environment. If exposed to rain, we recommend using encapsulated magnets, such as those made of non-metallic materials,
- The use of a protective casing or external holder is recommended, since machining multi-axis shapes in neodymium magnets is restricted,
- Potential hazard related to magnet particles may arise, when consumed by mistake, which is important in the protection of children. Furthermore, tiny components from these products can disrupt scanning after being swallowed,
- In cases of tight budgets, neodymium magnet cost is a challenge,
Highest magnetic holding force – what it depends on?
The given strength of the magnet corresponds to the optimal strength, determined under optimal conditions, that is:
- with mild steel, used as a magnetic flux conductor
- with a thickness of minimum 10 mm
- with a polished side
- with no separation
- with vertical force applied
- under standard ambient temperature
Lifting capacity in practice – influencing factors
In practice, the holding capacity of a magnet is conditioned by the following aspects, arranged from the most important to the least relevant:
- Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) can cause a drop in lifting force of up to 50%.
- Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
- Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
- Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
- Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
- Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.
* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.
Notes with Neodymium Magnets
Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.
In the case of placing a finger in the path of a neodymium magnet, in such a case, a cut or even a fracture may occur.
Neodymium magnets are not recommended for people with pacemakers.
In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.
You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.
Neodymium magnets produce intense magnetic fields that can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also destroy devices like video players, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.
Do not bring neodymium magnets close to GPS and smartphones.
Neodymium magnets generate strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.
Dust and powder from neodymium magnets are flammable.
Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.
Neodymium magnets can demagnetize at high temperatures.
While Neodymium magnets can demagnetize at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.
Do not give neodymium magnets to youngest children.
Not all neodymium magnets are toys, so do not let children play with them. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.
Neodymium magnets are noted for their fragility, which can cause them to crumble.
Magnets made of neodymium are delicate as well as will shatter if allowed to collide with each other, even from a distance of a few centimeters. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. At the moment of connection between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.
Neodymium magnets are over 10 times stronger than ferrite magnets (the ones in speakers), and their strength can shock you.
Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.
The magnet coating contains nickel, so be cautious if you have a nickel allergy.
Studies clearly indicate a small percentage of people who suffer from metal allergies such as nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.
Warning!
Please see the article - What danger lies in neodymium magnets? You will learn how to handle them properly.