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UMT 12x20 blue / N38 - board holder

board holder

Catalog no 230279

GTIN/EAN: 5906301814313

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

view technical specifications »

1.540 zł net / pcs

1.894 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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price from 1 pcs
1.540 zł
1.894 zł
price from 250 pcs
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price from 550 pcs
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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 blue / N38 - board holder

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

properties
properties values
Cat. no. 230279
GTIN/EAN 5906301814313
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 blue / 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
Engineering data and GPSR

Material specification

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: 230279-2026
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Thanks to the high "pin" type housing, the magnet is easy to detach from the board, unlike flat discs. Inside the plastic housing is a very strong neodymium magnet, not weak ferrite. It's a professional choice for office, school, conference room, and home.
They will easily hold a heavier calendar, map, or diploma on the fridge. They are many times stronger than traditional black ferrite magnets found in markets.
They work well as markers on maps, scoreboards, planners, or Kanban systems. 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).
Caution should be exercised and the product kept away from infants. For older children, they are a great scientific aid for physics experiments.
Both single-color sets (e.g., 10 pcs) and mix variants (rainbow) are available. Check purchasing options (pieces or blisters) in the product details above.

Advantages and disadvantages of rare earth magnets.

Benefits

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They do not lose strength, even over around 10 years – the reduction in lifting capacity is only ~1% (theoretically),
  • They feature excellent resistance to magnetic field loss when exposed to external fields,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets are characterized by maximum magnetic induction on the working surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of detailed forming and adjusting to atypical requirements,
  • Fundamental importance in electronics industry – they are utilized in hard drives, motor assemblies, diagnostic systems, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of creating threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

The specified lifting capacity concerns the peak performance, recorded under optimal environment, meaning:
  • with the contact of a sheet made of special test steel, ensuring maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • with direct contact (no coatings)
  • under axial force vector (90-degree angle)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

During everyday use, the actual holding force is determined by a number of factors, listed from crucial:
  • Gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the holding force.

H&S for magnets
Crushing risk

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

Metal Allergy

Studies show that nickel (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact or choose coated magnets.

Keep away from electronics

GPS units and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Swallowing risk

Adult use only. Tiny parts pose a choking risk, leading to severe trauma. Store away from kids and pets.

Keep away from computers

Do not bring magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Fire risk

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

Caution required

Exercise caution. Rare earth magnets act from a distance and snap with huge force, often quicker than you can react.

ICD Warning

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Permanent damage

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

Beware of splinters

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them breaking into small pieces.

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