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UMT 12x20 purple / N38 - board holder

board holder

Catalog no 230280

GTIN/EAN: 5906301814320

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 parameters »

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
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1.894 zł
price from 250 pcs
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price from 550 pcs
1.355 zł
1.667 zł

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 - UMT 12x20 purple / N38 - board holder

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

properties
properties values
Cat. no. 230280
GTIN/EAN 5906301814320
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 purple / 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
Engineering data and GPSR

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%

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: 230280-2026
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Magnetic pins stand out with an ergonomic shape that facilitates gripping and moving them. Small size hides great power - one pin works better than a handful of regular magnets. 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 are many times stronger than traditional black ferrite magnets found in markets.
At home, they will serve to attach shopping lists, bills, photos, and drawings to the fridge. 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).
Due to small size, pins are not suitable for small children under 3 years old. In the office and school, they are a safe work tool for adults and teenagers.
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.

Strengths as well as weaknesses of rare earth magnets.

Advantages

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are extremely resistant to demagnetization caused by external magnetic fields,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets are characterized by maximum magnetic induction on the surface,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Due to the ability of flexible forming and adaptation to unique needs, magnetic components can be manufactured in a broad palette of shapes and sizes, which increases their versatility,
  • Wide application in modern industrial fields – they are used in mass storage devices, electric motors, medical devices, also multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Problematic aspects of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • NdFeB magnets demagnetize 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
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of producing nuts in the magnet and complex forms - recommended is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Magnetic strength at its maximum – what affects it?

Breakaway force was determined for optimal configuration, assuming:
  • 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
  • under conditions of no distance (metal-to-metal)
  • under perpendicular application of breakaway force (90-degree angle)
  • at standard ambient temperature

Key elements affecting lifting force

In real-world applications, the actual lifting capacity depends on many variables, listed from the most important:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Safety rules for work with neodymium magnets
This is not a toy

Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are life-threatening.

Machining danger

Dust produced during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Keep away from computers

Do not bring magnets near a purse, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Safe operation

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

Compass and GPS

A strong magnetic field interferes with the operation of compasses in smartphones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Pinching danger

Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Warning for heart patients

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Warning for allergy sufferers

Certain individuals experience a hypersensitivity to nickel, which is the common plating for neodymium magnets. Frequent touching may cause skin redness. It is best to wear safety gloves.

Heat warning

Avoid heat. NdFeB magnets are susceptible to heat. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Magnets are brittle

Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

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