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UMN 490x43x28 / N52 - knife holder

knife holder

Catalog no 200579

GTIN/EAN: 5906301815709

Load capacity 5.00 kg / 49.03 N
length
490 mm [±1 mm]
Width
43 mm [±1 mm]
Height
28 mm [±1 mm]
Weight
1825 g

How we measure these parameters — certificates and measurements

check parameters »

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Frequently asked questions

Which magnetic holder is suitable for moving metal parts in a workshop?
Choose a device designed for the intended handling task and check its rated conditions, attachment point and the steel being gripped. A basic permanent-magnet holder is not a certified device for lifting a load over people.
How do I choose a holder for hanging a heavy item and check its real grip?
Compare the catalogue pull rating with the actual steel thickness, surface condition, gap and load direction. Grip along a vertical surface differs from perpendicular pull. Add an independent mechanical safeguard where falling would cause harm.
Which magnetic holders can be used outdoors?
Check the coating, housing and permitted operating conditions on the individual product card. Rubber can help protect a painted surface, but do not assume that every holder is suitable for permanent immersion or salt spray.
How should I choose a strong threaded holder for field work?
Select an internal or external thread to match the part being attached. Then check the holder dimensions, pull rating, surface condition and moisture protection. Dirt and gaps can reduce practical grip.

Guides from the knowledge base

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Product card - UMN 490x43x28 / N52 - knife holder

Specification / characteristics - UMN 490x43x28 / N52 - knife holder

properties
properties values
Cat. no. 200579
GTIN/EAN 5906301815709
Distributor Dhit sp. z o.o.
Country of origin Poland / China / Germany
Customs code 85059029
length 490 mm [±1 mm]
Width 43 mm [±1 mm]
Height 28 mm [±1 mm]
Weight 1825 g
Load capacity ~ ? 5.00 kg / 49.03 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics UMN 490x43x28 / N52 - knife holder
properties values units
Remanence Br ? 14.2-14.7 kGs
Remanence Br ? 1420-1470 mT
Coercivity bHc ? 10.8-12.5 kOe
Coercivity bHc ? 860-995 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 48-53 BH max MGOe
Energy product BHmax ? 380-422 BH max KJ/m
Maximum working temperature ? ≤ 60 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 310 °C
Curie Temperature TF 590 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²
Technical specification and ecology

Chemical composition

iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%

Environmental data

recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 200579-2026
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We guarantee a sure grip even for heavy workshop tools, provided they are steel. It is a professional solution both for the kitchen (for large chef knives) and the garage.
The strip is screwed to the wall, ensuring maximum stability and safety when removing tools. After screwing, the strip holds firmly and won't fall off even when yanked. For full safety in kitchen and workshop, we always recommend screw mounting.
A strip is a professional way to keep knives sharp longer. This storage method prevents moisture and bacteria accumulation on blades. Wooden (bamboo) or plastic versions additionally protect steel from scratches.
A longer strip allows freer arrangement of items and easier access. A 50 cm strip holds a set of 8-10 tools or a large knife set. It is worth measuring available wall space before purchase.
It will not work with ceramic, aluminum, copper, or plastic knives. Tool steel works perfectly with the magnet. This is a universal solution for 99% of metal tools in home and workshop.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose power, even after nearly ten years – the drop in power is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the smooth layer of gold, the element gains a professional look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the option of flexible molding and adaptation to unique solutions, magnetic components can be produced in a variety of forms and dimensions, which makes them more universal,
  • Wide application in innovative solutions – they find application in HDD drives, brushless drives, diagnostic systems, also industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Do not exceed this material temperature limit: 60°C. Overheating may permanently weaken the magnet.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

Holding force of 5.00 kg is a measurement result executed under the following configuration:
  • with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an polished contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

In real-world applications, the actual lifting capacity is determined by several key aspects, ranked from crucial:
  • Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Plate material – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Medical interference

Patients with a heart stimulator must maintain an large gap from magnets. The magnetic field can interfere with the functioning of the implant.

Choking Hazard

NdFeB magnets are not suitable for play. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

Maximum temperature

Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.

Flammability

Machining of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Caution required

Be careful. Neodymium magnets attract from a distance and connect with massive power, often faster than you can move away.

Finger safety

Watch your fingers. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!

Keep away from electronics

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Protect data

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Material brittleness

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Avoid contact if allergic

Some people experience a contact allergy to nickel, which is the common plating for NdFeB magnets. Extended handling might lead to skin redness. We suggest use protective gloves.

Security! Want to know more? Check our post: Why are neodymium magnets dangerous?