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KM HF - 34,5 kg - magnetic bracket

magnetic bracket

Catalog no 170258

GTIN/EAN: 5906301813705

5.00
Load capacity 34.50 kg / 338.33 N
Weight
1040 g

How we measure these parameters — certificates and measurements

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28.00 zł net / pcs

34.44 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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Technical - KM HF - 34,5 kg - magnetic bracket

Specification / characteristics - KM HF - 34,5 kg - magnetic bracket

properties
properties values
Cat. no. 170258
GTIN/EAN 5906301813705
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 1040 g
Load capacity ~ ? 34.50 kg / 338.33 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

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%

Ecology and recycling (GPSR)

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: 170258-2026
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The magnetic square acts like an extra pair of hands, stably holding welded elements in the desired position. Thanks to it, you can freely set elements at an angle and perform tack welding.
Standard holder geometry supports the most popular mounting angles used in locksmithing. Suitable for any ferromagnetic material, i.e., black steel, cast iron, and some stainless steels.
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. 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.
The capacity given in the description (e.g., 11kg, 22kg, 34kg) refers to the force needed to detach the magnet from thick steel in ideal conditions. For light modeling works and small profiles, smaller models (up to 11kg) are sufficient.

Strengths and weaknesses of neodymium magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They retain full power for almost 10 years – the loss is just ~1% (in theory),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnets exhibit excellent magnetic induction on the outer side,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of exact modeling and optimizing to complex applications,
  • Fundamental importance in advanced technology sectors – they find application in HDD drives, electric drive systems, advanced medical instruments, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We suggest casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Best holding force of the magnet in ideal parameters – what contributes to it?

Holding force of 34.50 kg is a result of laboratory testing conducted under specific, ideal conditions:
  • with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • whose thickness is min. 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

It is worth knowing that the magnet holding will differ influenced by the following factors, starting with the most relevant:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Plate material – mild steel gives the best results. Alloy steels reduce magnetic properties and holding force.
  • Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
No play value

Only for adults. Tiny parts pose a choking risk, causing serious injuries. Keep away from kids and pets.

Caution required

Handle with care. Neodymium magnets attract from a long distance and snap with huge force, often quicker than you can move away.

Magnet fragility

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Do not drill into magnets

Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Serious injuries

Large magnets can smash fingers instantly. Never place your hand betwixt two attracting surfaces.

Protect data

Very strong magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Skin irritation risks

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and wear gloves.

Power loss in heat

Do not overheat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Pacemakers

People with a ICD have to keep an absolute distance from magnets. The magnetic field can stop the operation of the implant.

Compass and GPS

A powerful magnetic field disrupts the operation of magnetometers in phones and navigation systems. Keep magnets close to a device to avoid breaking the sensors.

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