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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

product specifications »

11.70 ZŁ with VAT / pcs + price for transport

9.51 ZŁ net + 23% VAT / pcs

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Call us +48 22 499 98 98 if you prefer contact us through contact form the contact page.
Force and form of a neodymium magnet can be verified with our magnetic mass calculator.

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Product card - 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
Technical and environmental data
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%
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: 320408-2026
Magnet Unit Converter
Pulling force
Magnetic Field
Insert your figure into a field, to see all other values will update instantly.

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Cylindrical holders (Type B) distinguish themselves with a large body height, which allows for deep mounting. Thanks to side shielding, they do not "catch" the walls of the mounting hole, which facilitates installation.
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.
All magnet energy is directed exclusively to the front (active surface), increasing point force. It increases attraction force in the magnet axis and facilitates assembly in ferromagnetic blocks.
It is one of the most durable types of holders, resistant to crushing. Thanks to the solid build, the holder withstands repeated impacts and shocks during work cycles.
These holders are produced with standard tolerance for industrial magnets (usually ±0.1 mm or h6). For mounting certainty and centering, gluing or screw fastening from the back is used.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • Their magnetic field is durable, and after approximately ten years it drops only by ~1% (theoretically),
  • They retain their magnetic properties even under close interference source,
  • In other words, due to the smooth finish of gold, the element gains visual value,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of exact forming and adjusting to complex requirements,
  • Significant place in innovative solutions – they are utilized in data components, electric drive systems, medical equipment, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Cons of neodymium magnets and proposals for their use:
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • 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 resistant to moisture
  • We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Holding force characteristics

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

The load parameter shown refers to the peak performance, measured under ideal test conditions, meaning:
  • with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
  • whose thickness is min. 10 mm
  • with a surface perfectly flat
  • without any clearance between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force is determined by a number of factors, listed from the most important:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be lost to the other side.
  • Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

H&S for magnets
Electronic devices

Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Beware of splinters

Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Crushing risk

Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Metal Allergy

Some people suffer from a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Extended handling might lead to skin redness. We recommend use protective gloves.

Maximum temperature

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Fire warning

Dust generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Conscious usage

Handle magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their force.

GPS Danger

An intense magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Do not bring magnets near a smartphone to avoid damaging the sensors.

This is not a toy

Strictly store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are very dangerous.

Pacemakers

People with a ICD must maintain an absolute distance from magnets. The magnetism can disrupt the functioning of the life-saving device.

Warning! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98