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neodymium magnets

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Where to purchase very strong neodymium magnet? Holders with magnets in airtight and durable steel casing are excellent for use in difficult climate conditions, including during snow and rain more

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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

bulk discounts:

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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

This tool eliminates the need to hold details in hands, increasing work safety and precision. Thanks to it, you can freely set elements at an angle and perform tack welding.
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. If you weld point-wise (TIG/MIG) and briefly, neodymium will be more convenient; for "heavy" welding, choose ferrite.
This function drastically facilitates work, positioning, and removing the holder after welding. Cleaning a regular magnet from chips is difficult and tedious, here it takes a second. It is a function highly valued by professionals, saving time and nerves.
Holding force depends on the thickness and shape of the welded element and the angle of application. For light modeling works and small profiles, smaller models (up to 11kg) are sufficient.

Pros and cons of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

  • Their power is durable, and after around ten years it decreases only by ~1% (theoretically),
  • Neodymium magnets prove to be extremely resistant to demagnetization caused by external field sources,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the surface of the magnet remains strong,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in designing and the capacity to modify to individual projects,
  • Key role in advanced technology sectors – they serve a role in data components, electromotive mechanisms, medical equipment, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets: application proposals

  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • 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 producing threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small elements of these products are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Best holding force of the magnet in ideal parameterswhat affects it?

The force parameter is a theoretical maximum value executed under specific, ideal conditions:

  • using a plate made of high-permeability steel, serving as a magnetic yoke
  • with a thickness minimum 10 mm
  • with an ground contact surface
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

What influences lifting capacity in practice

In real-world applications, the actual holding force results from many variables, presented from most significant:

  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel does not close the flux, causing part of the power to be escaped to the other side.
  • Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and lifting capacity.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets

Swallowing risk

NdFeB magnets are not toys. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.

Powerful field

Exercise caution. Rare earth magnets attract from a distance and connect with massive power, often quicker than you can move away.

Permanent damage

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

Metal Allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, immediately stop handling magnets and use protective gear.

Combustion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Electronic devices

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.

Eye protection

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Crushing risk

Protect your hands. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

GPS Danger

Note: neodymium magnets produce a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and GPS.

Implant safety

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Important!

More info about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98