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UMT 11x17 colorless / N38 - board holder

board holder

Catalog no 230266

GTIN/EAN: 5906301814290

5.00
Diameter Ø
11 mm [±1 mm]
Height
17 mm [±1 mm]
Weight
3 g
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see parameters »

1.250 zł net / pcs

1.538 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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price from 300 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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Technical specification of the product - UMT 11x17 colorless / N38 - board holder

Specification / characteristics - UMT 11x17 colorless / N38 - board holder

properties
properties values
Cat. no. 230266
GTIN/EAN 5906301814290
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 11 mm [±1 mm]
Height 17 mm [±1 mm]
Weight 3 g
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMT 11x17 colorless / 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

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%

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: 230266-2026
Measurement Calculator

Force (pull)

Field Strength

Input a figure in just one slot to see the conversion in all other units at once.

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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. They are aesthetic, colorful, and do not scratch the board surface thanks to a smooth base.
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.
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).
Due to small size, pins are not suitable for small children under 3 years old. The plastic housing protects the magnet itself from breaking, increasing usage safety.
You can choose colors matching office decor, company logo, or child's preferences. Check purchasing options (pieces or blisters) in the product details above.

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for around ten years – the drop is just ~1% (according to analyses),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • In other words, due to the aesthetic layer of silver, the element becomes visually attractive,
  • Magnets are distinguished by impressive magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in forming and the ability to modify to client solutions,
  • Significant place in modern technologies – they are commonly used in HDD drives, brushless drives, precision medical tools, also modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as 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 advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited possibility of making nuts in the magnet and complex forms - preferred is a housing - mounting mechanism.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:
  • using a plate made of high-permeability steel, acting as a magnetic yoke
  • with a thickness minimum 10 mm
  • with a plane free of scratches
  • under conditions of no distance (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Bear in mind that the application force may be lower influenced by elements below, in order of importance:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Base massiveness – too thin sheet does not accept the full field, causing part of the power to be lost to the other side.
  • Steel grade – the best choice is pure iron steel. Stainless steels may attract less.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Warnings
GPS Danger

A powerful magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Keep magnets near a device to prevent breaking the sensors.

Safe distance

Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.

Fire warning

Dust created during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Operating temperature

Control the heat. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.

Avoid contact if allergic

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and wear gloves.

This is not a toy

Absolutely store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are life-threatening.

Pacemakers

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Magnets are brittle

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Immense force

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Finger safety

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

Danger! More info about hazards in the article: Magnet Safety Guide.