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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

view specifications »

1.540 zł net / pcs

1.894 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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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
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

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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 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
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 and environmental data

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: 230280-2026
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Thanks to the high "pin" type housing, the magnet is easy to detach from the board, unlike flat discs. Using neodymium (NdFeB) guarantees huge holding force with small size. 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 guarantee that your notes and important information will stay in place.
Pins are ideal for whiteboards, magnetic boards, and glass boards in offices and schools. 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.
We offer a wide color range: red, blue, green, yellow, white, black, and many others. Pins are made of durable plastic with vivid colors that do not fade.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They retain full power for almost ten years – the loss is just ~1% (in theory),
  • Neodymium magnets prove to be remarkably resistant to demagnetization caused by external interference,
  • In other words, due to the metallic finish of silver, the element gains a professional look,
  • Magnets possess very high magnetic induction on the surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • In view of the potential of accurate forming and adaptation to individualized needs, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which makes them more universal,
  • Key role in innovative solutions – they are commonly used in HDD drives, electromotive mechanisms, medical devices, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of neodymium 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 secures them against impacts but also raises their durability
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing nuts in the magnet and complex forms - recommended is a housing - magnet mounting.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The specified lifting capacity represents the limit force, recorded under laboratory conditions, specifically:
  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

In practice, the real power depends on a number of factors, presented from most significant:
  • Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate decreases the load capacity.

Warnings
Safe operation

Be careful. Rare earth magnets attract from a distance and connect with huge force, often quicker than you can move away.

Safe distance

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Warning for heart patients

People with a pacemaker should maintain an large gap from magnets. The magnetism can interfere with the operation of the implant.

Do not overheat magnets

Keep cool. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Warning for allergy sufferers

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, immediately stop handling magnets and wear gloves.

Keep away from children

NdFeB magnets are not intended for children. Accidental ingestion of a few magnets can lead to them connecting inside the digestive tract, which poses a severe health hazard and necessitates immediate surgery.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Bone fractures

Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Fire warning

Powder produced during grinding of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Shattering risk

Neodymium magnets are sintered ceramics, which means they are very brittle. Impact of two magnets will cause them breaking into shards.

Security! Want to know more? Check our post: Why are neodymium magnets dangerous?