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neodymium magnets

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UMN 410x44x15 / N52 - knife holder

knife holder

Catalog no 200455

GTIN: 5906301813897

5

length [±0,1 mm]

410 mm

Width [±0,1 mm]

44 mm

Height [±0,1 mm]

15 mm

Weight

837 g

Load capacity

5 kg / 49.03 N

98.99 with VAT / pcs + price for transport

80.48 ZŁ net + 23% VAT / pcs

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UMN 410x44x15 / N52 - knife holder

Specification/characteristics UMN 410x44x15 / N52 - knife holder
properties
values
Cat. no.
200455
GTIN
5906301813897
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
410 mm [±0,1 mm]
Width
44 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
837 g [±0,1 mm]
Load capacity ~ ?
5 kg / 49.03 N
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N52

properties
values
units
remenance Br [Min. - Max.] ?
14.2-14.7
kGs
remenance Br [Min. - Max.] ?
1420-1470
T
coercivity bHc ?
10.8-12.5
kOe
coercivity bHc ?
860-995
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
48-53
BH max MGOe
energy density [Min. - Max.] ?
380-422
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of NdFeB

properties
values
units
Vickers hardness
≥550
Hv
Density
≥7.4
g/cm3
Curie Temperature TC
312 - 380
°C
Curie Temperature TF
593 - 716
°F
Specific resistance
150
μΩ⋅Cm
Bending strength
250
Mpa
Compressive strength
1000~1100
Mpa
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

Holders with neodymium magnets for knives serve as practical accessories for storing steel accessories in kitchens, as well as in garages. Equipped with strong magnets (neodymium), that hold ferromagnetic objects with a holding force from 1 kg to 7 kg, depending on their size and quality. Mounting can be done via screws or adhesive tape, which allows easy mounting on a surface even without the need to drill holes. In cooking areas, they are used for storing kitchen utensils, e.g. knives, spatulas, ensuring quick access and visual order. In the workshop, they are perfect for holding wrenches, screwdrivers, which enhances workspace clarity and work safety. Advantages include durability, rust protection (especially with stainless steel 304 or 316) as well as easy cleaning. Selected versions, such as Wüsthof, come in lengths from 20 cm to 60 cm, making it easy to match individual needs. It is important to clean off metal debris, because they can accumulate on the surface. Neodymium magnets can be brittle and can disrupt electronic devices, therefore keep them away from electronic devices and magnetic cards. Important: magnets only work with steel objects. It’s advisable to opt for products from trusted manufacturers, such as Rig-Tig Magnetic, to guarantee quality and durability.

Advantages as well as disadvantages of neodymium magnets NdFeB.

Besides their high retention, neodymium magnets are valued for these benefits:

  • Their power is durable, and after around ten years, it drops only by ~1% (theoretically),
  • They show exceptional resistance to demagnetization from outside magnetic sources,
  • By applying a bright layer of silver, the element gains a sleek look,
  • They have very high magnetic induction on the surface of the magnet,
  • With the right combination of compounds, they reach increased thermal stability, enabling operation at or above 230°C (depending on the design),
  • The ability for precise shaping as well as adaptation to individual needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which extends the scope of their use cases,
  • Key role in modern technologies – they find application in HDDs, electric motors, healthcare devices along with technologically developed systems,
  • Compactness – despite their small size, they generate strong force, making them ideal for precision applications

Disadvantages of rare earth magnets:

  • They are prone to breaking when subjected to a heavy impact. If the magnets are exposed to physical collisions, they should be placed in a steel housing. The steel housing, in the form of a holder, protects the magnet from damage and additionally increases its overall resistance,
  • Magnets lose field strength when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible magnetic decay (influenced by the magnet’s form). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
  • Magnets exposed to damp air can oxidize. Therefore, for outdoor applications, we recommend waterproof types made of plastic,
  • Using a cover – such as a magnetic holder – is advised due to the restrictions in manufacturing holes directly in the magnet,
  • Safety concern due to small fragments may arise, when consumed by mistake, which is significant in the protection of children. Furthermore, miniature parts from these devices can disrupt scanning when ingested,
  • Higher purchase price is one of the drawbacks compared to ceramic magnets, especially in budget-sensitive applications

Highest magnetic holding forcewhat affects it?

The given lifting capacity of the magnet corresponds to the maximum lifting force, determined under optimal conditions, specifically:

  • with the use of low-carbon steel plate serving as a magnetic yoke
  • having a thickness of no less than 10 millimeters
  • with a smooth surface
  • in conditions of no clearance
  • in a perpendicular direction of force
  • under standard ambient temperature

Lifting capacity in real conditions – factors

Practical lifting force is determined by elements, listed from the most critical to the less significant:

  • Air gap between the magnet and the plate, as even a very small distance (e.g. 0.5 mm) causes 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.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.

Handle with Care: Neodymium 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.

Neodymium magnets can attract to each other, pinch the skin, and cause significant swellings.

Neodymium magnets jump and also clash mutually within a radius of several to almost 10 cm from each other.

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

Neodymium magnets are the most powerful magnets ever created, and their strength can shock you.

Please review the information on how to handle neodymium magnets and avoid significant harm to your body, as well as prevent unintentional damage to the magnets.

Never bring neodymium magnets close to a phone and GPS.

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.

People with pacemakers are advised to avoid neodymium magnets.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

Neodymium magnets can become demagnetized at high temperatures.

Although magnets are generally resilient, their ability to retain their magnetic strength can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

Under no circumstances should neodymium magnets be placed near a computer HDD, TV, and wallet.

Magnetic fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

Magnets made of neodymium are especially fragile, which leads to damage.

Magnets made of neodymium are delicate as well as will break 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 collision between the magnets, small sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

 Maintain neodymium magnets away from children.

Neodymium magnets are not toys. Do not allow children to play with them. They can be a significant choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing severe injuries, and even death.

Safety precautions!

So that know how powerful neodymium magnets are and why they are so dangerous, see the article - Dangerous very strong neodymium magnets.

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