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UMT 12x20 orange / N38 - board holder

board holder

Catalog no 230282

GTIN/EAN: 5906301814344

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

How we measure these parameters — certificates and measurements

technical parameters »

1.540 zł net / pcs

1.894 zł with VAT (23% VAT) / pcs

price for transport

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Frequently asked questions

How many sheets of paper will one magnetic pin hold?
The category description quotes <strong>up to 20 sheets of A4</strong>, and that is the number to start from. It is not fixed: a magnet holds more firmly on a thicker base — a fridge door or a solid whiteboard backing gives more than the thin sheet behind a cheap dry-wipe board. Paper matters too: twenty sheets of office weight is not the same as twenty sheets of coated stock. For thicker stacks and folders take a larger size, 20x25 or 29x38 mm — a bigger contact area than 12x20.
Will a magnetic pin stick to any board - whiteboard, glass, cork?
No, not to every surface — a magnet only holds on a ferromagnetic material, which usually means whiteboards and glass boards that have a steel sheet underneath. Plain glass without a metal backing won't attract the magnet at all. Cork boards mostly lack a metal layer too, so the pin won't stick unless the manufacturer specifically states the board is magnetic. Before buying, a simple test helps — try any magnet against the board in the shop or at home.
Will the magnet leave a mark or scratch the board or the fridge?
No, under normal use the pin leaves no lasting mark or scratch — the bottom of the magnet has an ergonomic, smooth shape designed for contact with smooth surfaces like a lacquered fridge door or a laminated board. The risk appears only when sliding the magnet across a surface with trapped grit or other hard particles caught between the base and the board — that can cause a light scratch, the same as with any object dragged across a painted surface. Wiping the magnet's base regularly removes this risk.
What is the difference between the 12x20 and 20x25 sizes, and which one suits an office?
The main difference is holding strength and grip comfort — the UMT 20x25 has a larger magnet surface, so it holds a thicker stack of sheets more firmly and is easier to grab with your fingers. The UMT 12x20 is compact and works better where board space is tight, for example with many small notes side by side. For a typical office board holding a few sheets and schedules, both sizes work fine — the choice mainly comes down to whether holding strength or fitting more pins side by side matters more.
Are magnetic pins suitable for large-format maps and plans?
Yes, they work well for that — the larger UMT 20x25 variant is well suited to maps and plans hung on magnetic boards in offices, on construction sites, or in planning rooms, since it holds heavier, stiffer paper better than the smaller pin. For a large format, it helps to place several pins along the corners and edges of the plan rather than just one in the center — this spreads the pressure and prevents the paper from sagging under its own weight.

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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Product card - UMT 12x20 orange / N38 - board holder

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

properties
properties values
Cat. no. 230282
GTIN/EAN 5906301814344
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 orange / N38 - board holder
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 and environmental data

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%

Sustainability

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: 230282-2026
Measurement Calculator

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This shape makes operating a whiteboard convenient, fast, and does not break nails. Using neodymium (NdFeB) guarantees huge holding force with small size. It's a professional choice for office, school, conference room, and home.
Despite inconspicuous size, one pin with a neodymium magnet can hold even 15-20 A4 paper sheets. They guarantee that your notes and important information will stay in place.
Pins are ideal for whiteboards, magnetic boards, and glass boards in offices and schools. You can use them for board games (as pawns) and educational games with children. Note: Special, even stronger neodymium magnets are needed for glass boards.
Due to small size, pins are not suitable for small children under 3 years old. For older children, they are a great scientific aid for physics experiments.
You can choose colors matching office decor, company logo, or child's preferences. Pins are made of durable plastic with vivid colors that do not fade.

Strengths as well as weaknesses of neodymium magnets.

Pros

Apart from their notable power, neodymium magnets have these key benefits:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • They are resistant to demagnetization induced by external field influence,
  • Thanks to the shimmering finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an modern appearance,
  • Magnetic induction on the working layer of the magnet is maximum,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of individual creating and modifying to concrete needs,
  • Significant place in future technologies – they serve a role in data components, motor assemblies, medical equipment, also complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • 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 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
  • Limited ability of making nuts in the magnet and complicated forms - preferred is a housing - magnet mounting.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small elements of these devices are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Highest magnetic holding force – what contributes to it?

The load parameter shown refers to the maximum value, measured under laboratory conditions, meaning:
  • with the contact of a sheet made of special test steel, ensuring maximum field concentration
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface cleaned and smooth
  • without any insulating layer between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at conditions approx. 20°C

Key elements affecting lifting force

Real force is affected by working environment parameters, such as (from most important):
  • Gap (between the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • 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 many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

Warnings
Shattering risk

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Magnetic media

Do not bring magnets near a wallet, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Fire warning

Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Keep away from children

Neodymium magnets are not suitable for play. Eating several magnets may result in them pinching intestinal walls, which poses a severe health hazard and necessitates urgent medical intervention.

Crushing force

Big blocks can crush fingers in a fraction of a second. Never put your hand between two strong magnets.

Allergy Warning

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, immediately stop handling magnets and use protective gear.

Heat warning

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

Handling rules

Use magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their force.

Impact on smartphones

GPS units and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Pacemakers

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

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