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UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220328

GTIN/EAN: 5906301814184

5.00

Diameter Ø

25 mm [±1 mm]

cone dimension Ø

10.5x5.5 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.00 kg / 137.29 N

Coating

[NiCuNi] Nickel

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9.72 ZŁ with VAT / pcs + price for transport

7.90 ZŁ net + 23% VAT / pcs

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Technical - UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

Specification / characteristics - UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220328
GTIN/EAN 5906301814184
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 25 mm [±1 mm]
cone dimension Ø 10.5x5.5 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 21 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.00 kg / 137.29 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 25x10.5x5.5x8 / N38 - conical magnetic 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 312 - 380 °C
Curie Temperature TF 593 - 716 °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: 220328-2026
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It is the most popular solution for creating aesthetic, invisible door locks. Thanks to the hole with a chamfer (conical), the screw head hides in the magnet, ensuring a flat contact surface. The steel cup strengthens the magnet force and protects it from cracking upon impact.
Remember that neodymium breaks easily if the screw is tightened too hard. It is best to use a screw with a countersunk head perfectly matched to the hole. The screw head should not protrude above the magnet surface, but it cannot burst it either.
Two identical magnets (e.g., both N) bought randomly will repel each other with mounting sides. Often a more convenient and cheaper solution is using one magnet and a steel washer (plate) as an armature. Mounting a magnet to a plate eliminates the problem of matching poles and is easier.
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.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. It is a more durable and safer solution in everyday use than a bare ring. The countersunk holder is a professional mounting solution with increased durability.

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • They do not lose power, even after nearly 10 years – the drop in strength is only ~1% (according to tests),
  • They possess excellent resistance to weakening of magnetic properties when exposed to external fields,
  • Thanks to the metallic finish, the plating of nickel, gold, or silver gives an clean appearance,
  • Magnetic induction on the working part of the magnet is impressive,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • In view of the ability of free forming and adaptation to individualized projects, neodymium magnets can be created in a variety of geometric configurations, which expands the range of possible applications,
  • Versatile presence in modern industrial fields – they are utilized in mass storage devices, electric drive systems, precision medical tools, also multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

What to avoid - cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • We suggest casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Detachment force of the magnet in optimal conditions – what it depends on?

Holding force of 14.00 kg is a theoretical maximum value executed under standard conditions:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a surface cleaned and smooth
  • with zero gap (without coatings)
  • during detachment in a direction vertical to the plane
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

In practice, the actual holding force depends on many variables, ranked from the most important:
  • Air gap (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Load vector – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin sheet does not accept the full field, causing part of the flux to be lost to the other side.
  • Metal type – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Warnings
Danger to pacemakers

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Mechanical processing

Powder produced during cutting of magnets is flammable. Do not drill into magnets unless you are an expert.

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, cease working with magnets and use protective gear.

Cards and drives

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

Handling guide

Handle with care. Neodymium magnets act from a distance and snap with huge force, often faster than you can react.

Impact on smartphones

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

Material brittleness

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

This is not a toy

These products are not suitable for play. Accidental ingestion of a few magnets may result in them attracting across intestines, which poses a critical condition and requires urgent medical intervention.

Crushing force

Big blocks can smash fingers instantly. Never place your hand betwixt two strong magnets.

Do not overheat magnets

Avoid heat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Warning! More info about risks in the article: Magnet Safety Guide.