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UMC 20x6/3x7 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320407

GTIN/EAN: 5906301814634

5.00

Diameter

20 mm [±1 mm]

internal diameter Ø

6/3 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

12 g

Load capacity

6.00 kg / 58.84 N

Coating

[NiCuNi] Nickel

see technical specifications »

6.99 ZŁ with VAT / pcs + price for transport

5.68 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 888 99 98 98 alternatively send us a note via our online form the contact page.
Weight as well as form of neodymium magnets can be checked with our modular calculator.

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Technical of the product - UMC 20x6/3x7 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 20x6/3x7 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320407
GTIN/EAN 5906301814634
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 20 mm [±1 mm]
internal diameter Ø 6/3 mm [±1 mm]
Height 7 mm [±1 mm]
Weight 12 g
Load capacity ~ ? 6.00 kg / 58.84 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 20x6/3x7 / 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
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%
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: 320407-2026
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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.
It can also be glued or pressed (maintaining tolerance) into a prepared hole. It is a precise, durable solution enabling depth adjustment.
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.
The steel housing provides excellent mechanical protection for the brittle magnet against impacts. Thanks to the solid build, the holder withstands repeated impacts and shocks during work cycles.
We recommend making the mounting hole with slight clearance and using glue for certainty. If high precision is required, measure the specific batch with a caliper before machining sockets.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • They have excellent resistance to magnetism drop due to external magnetic sources,
  • By applying a smooth layer of silver, the element gains an modern look,
  • Magnetic induction on the surface of the magnet turns out to be extremely intense,
  • 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...
  • Thanks to freedom in designing and the capacity to customize to complex applications,
  • Key role in innovative solutions – they are used in mass storage devices, electric motors, diagnostic systems, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Limitations

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these devices can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Magnet power was defined for ideal contact conditions, assuming:
  • using a plate made of low-carbon steel, serving as a magnetic yoke
  • whose transverse dimension is min. 10 mm
  • with an polished contact surface
  • with total lack of distance (without coatings)
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Real force is influenced by specific conditions, including (from most important):
  • Distance – existence of foreign body (paint, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be wasted to the other side.
  • Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the load capacity.

Warnings
Heat sensitivity

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Compass and GPS

A strong magnetic field interferes with the operation of magnetometers in smartphones and navigation systems. Keep magnets near a device to prevent damaging the sensors.

Crushing risk

Big blocks can smash fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Machining danger

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

Handling rules

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Allergic reactions

A percentage of the population suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Prolonged contact might lead to an allergic reaction. We recommend use safety gloves.

Implant safety

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

Beware of splinters

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.

Adults only

Absolutely keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.

Threat to electronics

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can permanently damage these devices and erase data from cards.

Important! Details about risks in the article: Magnet Safety Guide.