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UMS 42x12.5x6.5x9 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220331

GTIN/EAN: 5906301814214

5.00
Load capacity 37.00 kg / 362.85 N
Diameter Ø
42 mm [±1 mm]
cone dimension Ø
12.5x6.5 mm [±1 mm]
Height
9 mm [±1 mm]
Weight
72 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical specifications »

22.00 zł net / pcs

27.06 zł with VAT (23% VAT) / pcs

price for transport

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Gross
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27.06 zł
price from 20 pcs
18.70 zł
23.00 zł
price from 40 pcs
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17.59 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 - UMS 42x12.5x6.5x9 / N38 - conical magnetic holder

Specification / characteristics - UMS 42x12.5x6.5x9 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220331
GTIN/EAN 5906301814214
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 42 mm [±1 mm]
cone dimension Ø 12.5x6.5 mm [±1 mm]
Height 9 mm [±1 mm]
Weight 72 g
Magnetization Direction ↑ axial
Load capacity ~ ? 37.00 kg / 362.85 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 42x12.5x6.5x9 / N38 - conical magnetic 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

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%

Sustainability

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: 220331-2026
Measurement Calculator

Magnet pull force

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It is the most popular solution for creating aesthetic, invisible door locks. The ability to flush the screw with the magnet surface allows for perfect closing without gaps. The steel cup strengthens the magnet force and protects it from cracking upon impact.
Despite the steel housing, the magnet itself is prone to cracking under strong point pressure. Avoid forceful tightening when you feel resistance. Using too large a countersunk screw may cause the magnetic ring to crack.
To create a pair (magnet-magnet), you need one holder with an N pole on the chamfer and another with an S pole. If you need a pair, ask about availability of complementary sets or check the description. A set of magnet + plate is cheaper and holds just as strongly.
This value is the maximum achievement a magnet can obtain on a thick sheet. To increase friction and prevent sliding, it is worth sticking a piece of rubber or anti-slip tape on the magnet. Paint or veneer on metal also reduces effective attraction force.
A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. Furthermore, steel protects the brittle neodymium from mechanical damage when closing cabinets (impacts). A bare ring has a dispersed field on both sides but is weaker in point holding.

Pros as well as cons of neodymium magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose power, even after nearly 10 years – the reduction in power is only ~1% (according to tests),
  • They retain their magnetic properties even under close interference source,
  • In other words, due to the shiny finish of gold, the element becomes visually attractive,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures approaching 230°C and above...
  • Thanks to modularity in forming and the ability to customize to unusual requirements,
  • Significant place in advanced technology sectors – they find application in hard drives, electric drive systems, medical equipment, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. 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 suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making threads in the magnet and complex shapes - recommended is casing - mounting mechanism.
  • Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum magnetic pulling force – what contributes to it?

Information about lifting capacity was defined for optimal configuration, assuming:
  • using a base made of high-permeability steel, functioning as a magnetic yoke
  • whose transverse dimension is min. 10 mm
  • with an ground touching surface
  • without the slightest clearance between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

What influences lifting capacity in practice

It is worth knowing that the magnet holding may be lower depending on the following factors, in order of importance:
  • Distance – existence of any layer (rust, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Steel thickness – too thin sheet does not close the flux, causing part of the power to be wasted to the other side.
  • Material composition – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Precision electronics

Be aware: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Magnets are brittle

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Pacemakers

People with a heart stimulator must keep an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.

This is not a toy

Neodymium magnets are not toys. Eating several magnets can lead to them pinching intestinal walls, which poses a severe health hazard and requires urgent medical intervention.

Crushing risk

Risk of injury: The pulling power is so immense that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Immense force

Use magnets consciously. Their immense force can surprise even professionals. Stay alert and respect their power.

Fire risk

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

Permanent damage

Keep cool. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Magnetic media

Do not bring magnets near a wallet, computer, or TV. The magnetism can destroy these devices and wipe information from cards.

Warning for allergy sufferers

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid direct skin contact or opt for encased magnets.

Security! Looking for details? Read our article: Are neodymium magnets dangerous?