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KM HF - 22 kg - magnetic bracket

magnetic bracket

Catalog no 170257

GTIN/EAN: 5906301813699

5.00
Load capacity 22.00 kg / 215.75 N
Weight
593 g

How we measure these parameters — certificates and measurements

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24.00 zł net / pcs

29.52 zł with VAT (23% VAT) / pcs

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Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

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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Detailed specification - KM HF - 22 kg - magnetic bracket

Specification / characteristics - KM HF - 22 kg - magnetic bracket

properties
properties values
Cat. no. 170257
GTIN/EAN 5906301813699
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Weight 593 g
Load capacity ~ ? 22.00 kg / 215.75 N
Manufacturing Tolerance ±1 mm

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

Elemental analysis

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: 170257-2026
Measurement Calculator

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This holder allows precise positioning of pipes, profiles, and flat bars before welding, without needing a helper. 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°. It can be used not only for welding but also for soldering, assembly, marking out, and laying out structures.
Traditional red squares are based on ferrite magnets, which are resistant to high temperatures (up to 250°C) and cheaper. Neodymiums provide huge force with small dimensions, which is an advantage in tight spaces, but temperature must be watched.
Squares with a switch (ON/OFF) allow easy activation and deactivation of the magnetic field. 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.
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.

Strengths and weaknesses of Nd2Fe14B magnets.

Strengths

Apart from their consistent power, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They have excellent resistance to weakening of magnetic properties as a result of external fields,
  • By using a shiny coating of gold, the element gains an aesthetic look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
  • Thanks to versatility in constructing and the capacity to modify to individual projects,
  • Huge importance in future technologies – they are used in data components, electromotive mechanisms, diagnostic systems, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems

Disadvantages

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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 during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using cover - magnetic mount.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Maximum holding power of the magnet – what affects it?

The load parameter shown represents the limit force, measured under optimal environment, namely:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a surface cleaned and smooth
  • with direct contact (without impurities)
  • under vertical application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Holding efficiency impacted by working environment parameters, including (from priority):
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Medical interference

Warning for patients: Strong magnetic fields disrupt electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Heat warning

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Danger to the youngest

Neodymium magnets are not toys. Eating multiple magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.

Bone fractures

Watch your fingers. Two large magnets will join instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Nickel coating and allergies

Certain individuals have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Frequent touching might lead to skin redness. We strongly advise use protective gloves.

Magnet fragility

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Fire risk

Powder produced during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Cards and drives

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can permanently damage these devices and erase data from cards.

Powerful field

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Precision electronics

Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Warning! More info about hazards in the article: Magnet Safety Guide.