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UMC 75x11/6x18 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320414

GTIN/EAN: 5906301814702

5.00

Diameter

75 mm [±1 mm]

internal diameter Ø

11/6 mm [±1 mm]

Height

18 mm [±1 mm]

Weight

465 g

Magnetization Direction

↑ axial

Load capacity

155.00 kg / 1520.03 N

Coating

[NiCuNi] Nickel

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169.86 ZŁ with VAT / pcs + price for transport

138.10 ZŁ net + 23% VAT / pcs

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Strength along with appearance of neodymium magnets can be reviewed with our force calculator.

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Detailed specification - UMC 75x11/6x18 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 75x11/6x18 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320414
GTIN/EAN 5906301814702
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 75 mm [±1 mm]
internal diameter Ø 11/6 mm [±1 mm]
Height 18 mm [±1 mm]
Weight 465 g
Magnetization Direction ↑ axial
Load capacity ~ ? 155.00 kg / 1520.03 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 75x11/6x18 / 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
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: 320414-2026
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Force (pull)
Field Strength
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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. Thanks to the long body, the magnet is stable in the hole and does not tilt.
All magnet energy is directed exclusively to the front (active surface), increasing point force. This is a key feature when mounting in steel sockets so the magnet doesn't "stick" to the hole walls during insertion.
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.
These holders are produced with standard tolerance for industrial magnets (usually ±0.1 mm or h6). If high precision is required, measure the specific batch with a caliper before machining sockets.

Strengths as well as weaknesses of rare earth magnets.

Pros

Apart from their consistent power, neodymium magnets have these key benefits:
  • Their magnetic field is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external magnetic fields,
  • By using a decorative layer of nickel, the element has an nice look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in constructing and the capacity to modify to unusual requirements,
  • Significant place in innovative solutions – they serve a role in data components, electric drive systems, medical devices, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, assuming:
  • using a plate made of low-carbon steel, serving as a circuit closing element
  • whose thickness is min. 10 mm
  • with a surface perfectly flat
  • with zero gap (no paint)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Effective lifting capacity impacted by specific conditions, such as (from priority):
  • Clearance – the presence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Stainless steels may attract less.
  • Surface finish – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Bone fractures

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Immense force

Use magnets consciously. Their powerful strength can surprise even professionals. Be vigilant and do not underestimate their power.

Choking Hazard

Neodymium magnets are not suitable for play. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a severe health hazard and requires immediate surgery.

Heat warning

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

Dust is flammable

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Warning for heart patients

Patients with a pacemaker should maintain an large gap from magnets. The magnetism can interfere with the functioning of the implant.

Allergic reactions

It is widely known that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from direct skin contact and select coated magnets.

Phone sensors

GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Material brittleness

Neodymium magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets will cause them shattering into shards.

Keep away from computers

Intense magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of min. 10 cm.

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