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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
Load capacity ~ ?
22 kg / 215.75 N
Manufacturing Tolerance
±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

This holder allows precise positioning of pipes, profiles, and flat bars before welding, without needing a helper. This ensures perfect angle maintenance and facilitates the assembly of complex steel structures.
Most squares (including this model) allow quick setting of elements at angles of 45°, 90°, and 135°. The housing shape (often with a special notch) allows gripping both flat profiles as well as pipes or shafts.
Ferrite magnets are heavier and larger but handle heat generated during long welding better. 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. Lack of filings on the surface guarantees perfect adherence and angle precision on next use. 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 light modeling works and small profiles, smaller models (up to 11kg) are sufficient.

Pros as well as cons of rare earth magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • They maintain their magnetic properties even under external field action,
  • By using a shiny coating of silver, the element acquires an proper look,
  • Magnetic induction on the working layer of the magnet is extremely intense,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • Thanks to modularity in constructing and the capacity to customize to complex applications,
  • Significant place in electronics industry – they are commonly used in hard drives, brushless drives, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets and ways of using them

  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We recommend a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Magnetic strength at its maximum – what affects it?

Magnet power was determined for ideal contact conditions, taking into account:

  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • whose thickness equals approx. 10 mm
  • characterized by even structure
  • with zero gap (without paint)
  • during detachment in a direction perpendicular to the mounting surface
  • in stable room temperature

Lifting capacity in real conditions – factors

In real-world applications, the actual holding force is determined by many variables, presented from crucial:

  • Air gap (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate reduces the lifting capacity.

H&S for magnets

Nickel allergy

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, cease working with magnets and use protective gear.

Eye protection

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

ICD Warning

Individuals with a ICD should maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.

Swallowing risk

Only for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.

Thermal limits

Avoid heat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Threat to navigation

Be aware: rare earth magnets produce a field that confuses precision electronics. Maintain a separation from your phone, device, and GPS.

Conscious usage

Exercise caution. Neodymium magnets attract from a long distance and snap with huge force, often faster than you can move away.

Physical harm

Danger of trauma: The attraction force is so immense that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Dust explosion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Threat to electronics

Do not bring magnets near a wallet, laptop, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Important!

Details about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98