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neodymium magnets

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KM HF - 22 kg - magnetic bracket

magnetic bracket

Catalog no 170257

GTIN: 5906301813699

5

Weight

593 g

Load capacity

22 kg / 215.75 N

29.52 with VAT / pcs + price for transport

24.00 ZŁ net + 23% VAT / pcs

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KM HF - 22 kg - magnetic bracket
Specification/characteristics KM HF - 22 kg - magnetic bracket
properties
values
Cat. no.
170257
GTIN
5906301813699
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Weight
593 g [±0,1 mm]
Load capacity ~ ?
22 kg / 215.75 N
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material

properties
values
units

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
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

The magnetic square acts like an extra pair of hands, stably holding welded elements in the desired position. It is essential equipment for every locksmith, welder, and DIY enthusiast.
Some versions also allow setting angles of 30°, 60°, or 75°, increasing their versatility. The housing shape (often with a special notch) allows gripping both flat profiles as well as pipes or shafts.
For welding close to the seam and large elements, we recommend solid ferrite versions. Neodymium squares are smaller, lighter, and much stronger, but more sensitive to overheating (usually up to 80°C).
This function drastically facilitates work, positioning, and removing the holder after welding. After turning off the magnet (OFF position), all collected metal filings fall off by themselves, facilitating cleaning. It is a function highly valued by professionals, saving time and nerves.
Nominal capacity is a maximum value, in practice, the square works with less force on thin profiles. For heavy gates, posts, and long pipes, we recommend the largest squares (34kg and more), often used in pairs.

Advantages as well as disadvantages of neodymium magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

  • Their power is durable, and after around ten years it drops only by ~1% (theoretically),
  • Magnets very well defend themselves against loss of magnetization caused by foreign field sources,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the capacity to customize to individual projects,
  • Fundamental importance in electronics industry – they are used in HDD drives, electric motors, advanced medical instruments, as well as industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Problematic aspects of neodymium magnets: weaknesses and usage proposals

  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of producing threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Maximum magnetic pulling forcewhat contributes to it?

Breakaway force is the result of a measurement for ideal contact conditions, including:

  • using a plate made of low-carbon steel, serving as a circuit closing element
  • with a thickness no less than 10 mm
  • characterized by smoothness
  • with direct contact (no impurities)
  • under axial application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

It is worth knowing that the working load will differ influenced by elements below, starting with the most relevant:

  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets

Eye protection

Neodymium magnets are sintered ceramics, which means they are very brittle. Collision of two magnets leads to them cracking into small pieces.

Medical interference

Patients with a ICD have to keep an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Safe distance

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Swallowing risk

Only for adults. Tiny parts can be swallowed, causing severe trauma. Store out of reach of children and animals.

Power loss in heat

Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Phone sensors

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Hand protection

Pinching hazard: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Fire warning

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Safe operation

Use magnets consciously. Their huge power can shock even professionals. Stay alert and do not underestimate their force.

Allergic reactions

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and wear gloves.

Danger!

Looking for details? Check our post: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98