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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

How we measure these parameters — certificates and measurements

check properties »

1.540 zł net / pcs

1.894 zł with VAT (23% VAT) / pcs

price for transport

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Gross
price from 1 pcs
1.540 zł
1.894 zł
price from 250 pcs
1.448 zł
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price from 550 pcs
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1.667 zł

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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Technical of the product - 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
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 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: 230278-2026
Measurement Calculator

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Thanks to the high "pin" type housing, the magnet is easy to detach from the board, unlike flat discs. Small size hides great power - one pin works better than a handful of regular magnets. 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 do not slide down under the weight of a single sheet like cheap advertising substitutes.
Pins are ideal for whiteboards, magnetic boards, and glass boards in offices and schools. Available vivid colors facilitate information coding, prioritizing, and task organization. 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. Pins are made of durable plastic with vivid colors that do not fade.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after approximately 10 years – the decrease in power is only ~1% (based on measurements),
  • They feature excellent resistance to magnetic field loss when exposed to external fields,
  • By applying a smooth layer of gold, the element gains an nice look,
  • Magnetic induction on the top side of the magnet turns out to be extremely intense,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of custom machining as well as optimizing to individual needs,
  • Significant place in high-tech industry – they are utilized in mass storage devices, electric motors, diagnostic systems, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complicated shapes - recommended is casing - magnet mounting.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these magnets can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

Magnet power was defined for optimal configuration, assuming:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an ideally smooth touching surface
  • with direct contact (without impurities)
  • under perpendicular force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Bear in mind that the working load will differ depending on elements below, in order of importance:
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost into the air.
  • Chemical composition of the base – mild steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
  • Surface finish – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Warnings
Physical harm

Large magnets can smash fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Nickel coating and allergies

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

Swallowing risk

Strictly keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are very dangerous.

Handling guide

Use magnets consciously. Their powerful strength can surprise even experienced users. Plan your moves and do not underestimate their power.

Combustion hazard

Machining of NdFeB material carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Medical implants

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

Safe distance

Avoid bringing magnets near a wallet, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Phone sensors

A strong magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.

Fragile material

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

Operating temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Safety First! Details about hazards in the article: Magnet Safety Guide.