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UMT 12x20 red / N38 - board holder

board holder

Catalog no 230278

GTIN/EAN: 5906301814306

5.00
Diameter Ø
12 mm [±1 mm]
Height
20 mm [±1 mm]
Weight
3.5 g
Coating
[NiCuNi] Nickel
check specifications »

1.540 zł net / pcs

1.894 zł with VAT (23% VAT) / pcs

price for transport

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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 details - UMT 12x20 red / N38 - board holder

Specification / characteristics - UMT 12x20 red / N38 - board holder

properties
properties values
Cat. no. 230278
GTIN/EAN 5906301814306
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 12 mm [±1 mm]
Height 20 mm [±1 mm]
Weight 3.5 g
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMT 12x20 red / N38 - board holder
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

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%

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: 230278-2026
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Magnetic pins stand out with an ergonomic shape that facilitates gripping and moving them. Inside the plastic housing is a very strong neodymium magnet, not weak ferrite. They are aesthetic, colorful, and do not scratch the board surface thanks to a smooth base.
The force of these magnets allows pinning a thick file of documents, photos, posters, or drawings. They do not slide down under the weight of a single sheet like cheap advertising substitutes.
At home, they will serve to attach shopping lists, bills, photos, and drawings to the fridge. You can use them for board games (as pawns) and educational games with children. Check the description if this model is dedicated to glass boards (weak magnets do not work through glass).
Although the magnet is tightly sealed in a plastic housing, the product is small and poses a swallowing risk. In the office and school, they are a safe work tool for adults and teenagers.
We offer a wide color range: red, blue, green, yellow, white, black, and many others. Pins are made of durable plastic with vivid colors that do not fade.

Pros and cons of Nd2Fe14B magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • Magnets effectively protect themselves against loss of magnetization caused by external fields,
  • By using a smooth layer of nickel, the element gains an professional look,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual machining and adapting to defined applications,
  • Huge importance in electronics industry – they are commonly used in HDD drives, brushless drives, precision medical tools, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • with a cross-section of at least 10 mm
  • with a plane cleaned and smooth
  • with total lack of distance (no impurities)
  • for force applied at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Determinants of lifting force in real conditions

Holding efficiency is influenced by specific conditions, including (from most important):
  • Air gap (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – low-carbon steel attracts best. Alloy steels lower magnetic properties and holding force.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Data carriers

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

Allergy Warning

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.

Health Danger

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Operating temperature

Watch the temperature. Exposing the magnet to high heat will ruin its properties and strength.

Hand protection

Big blocks can crush fingers instantly. Do not put your hand betwixt two strong magnets.

Fire risk

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Beware of splinters

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

Danger to the youngest

Adult use only. Small elements pose a choking risk, causing intestinal necrosis. Keep out of reach of kids and pets.

Impact on smartphones

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Handling guide

Handle magnets with awareness. Their immense force can shock even experienced users. Plan your moves and respect their force.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?