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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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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 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
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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
Combustion hazard

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

Physical harm

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

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.

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.

Operating temperature

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

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.

Medical implants

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

Fragile material

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

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