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UMC 25x6/4x8 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320408

GTIN/EAN: 5906301814641

Diameter

25 mm [±1 mm]

internal diameter Ø

6/4 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

21 g

Load capacity

14.00 kg / 137.29 N

Coating

[NiCuNi] Nickel

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11.70 ZŁ with VAT / pcs + price for transport

9.51 ZŁ net + 23% VAT / pcs

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Strength and shape of a neodymium magnet can be tested using our power calculator.

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Technical - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320408
GTIN/EAN 5906301814641
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 25 mm [±1 mm]
internal diameter Ø 6/4 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 21 g
Load capacity ~ ? 14.00 kg / 137.29 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 25x6/4x8 / N38 - cylindrical 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
Engineering data and GPSR
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: 320408-2026
Measurement Calculator
Pulling force
Magnetic Induction
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Cylindrical holders (Type B) distinguish themselves with a large body height, which allows for deep mounting. Used where the magnet must be hidden deep in the material or precisely positioned.
These holders usually have an internal thread (blind or through) on the back wall. The mounting thread allows for stable and secure fixing in a machine or jig.
The construction causes the magnetic flux to short-circuit inside, making the sides practically non-magnetic. This is a key feature when mounting in steel sockets so the magnet doesn't "stick" to the hole walls during insertion.
It is one of the most durable types of holders, resistant to crushing. The risk of magnet cracking with normal use is minimal as it is shielded.
Dimensions may vary slightly, so they are not always H7 fitted elements without machining. It is an industrial product, not a precise machine element, although the execution is careful.

Advantages and disadvantages of rare earth magnets.

Benefits

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • Their power is maintained, and after around ten years it drops only by ~1% (theoretically),
  • Neodymium magnets are characterized by remarkably resistant to loss of magnetic properties caused by external interference,
  • In other words, due to the reflective surface of nickel, the element is aesthetically pleasing,
  • Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise modeling and optimizing to precise conditions,
  • Versatile presence in high-tech industry – they are utilized in computer drives, electromotive mechanisms, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Weaknesses

Drawbacks and weaknesses 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.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic holder, due to difficulties in producing threads inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these products can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum lifting capacity of the magnet – what contributes to it?

The load parameter shown refers to the limit force, obtained under optimal environment, meaning:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • in stable room temperature

Determinants of practical lifting force of a magnet

Bear in mind that the application force will differ depending on the following factors, starting with the most relevant:
  • Distance (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – hot environment reduces pulling force. 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, however under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

Warnings
Fire risk

Dust created during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Pacemakers

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Do not underestimate power

Be careful. Rare earth magnets act from a distance and connect with massive power, often faster than you can move away.

Do not give to children

Neodymium magnets are not intended for children. Accidental ingestion of a few magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires immediate surgery.

Precision electronics

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, tablet, and navigation systems.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness appears, cease handling magnets and use protective gear.

Magnets are brittle

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Serious injuries

Risk of injury: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Safe distance

Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Do not overheat magnets

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Safety First! Learn more about risks in the article: Magnet Safety Guide.