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UMC 32x11/3x8 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320409

GTIN/EAN: 5906301814658

5.00
Load capacity 23.00 kg / 225.55 N
Diameter
32 mm [±1 mm]
internal diameter Ø
11/3 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
36 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical specifications »

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Specifications along with structure of neodymium magnets can be tested on our magnetic calculator.

Same-day shipping for orders placed before 14:00.

Physical properties - UMC 32x11/3x8 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 32x11/3x8 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320409
GTIN/EAN 5906301814658
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 32 mm [±1 mm]
internal diameter Ø 11/3 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 36 g
Magnetization Direction ↑ axial
Load capacity ~ ? 23.00 kg / 225.55 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 32x11/3x8 / 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 specification and ecology

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: 320409-2026
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They are characterized by point action of the magnetic field exclusively on the front surface. Thanks to side shielding, they do not "catch" the walls of the mounting hole, which facilitates installation.
Mounting is done by screwing with a bolt from the back of the device or machine. Thanks to the long body, the magnet is stable in the hole and does not tilt.
The construction causes the magnetic flux to short-circuit inside, making the sides practically non-magnetic. 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.
Dimensions may vary slightly, so they are not always H7 fitted elements without machining. If high precision is required, measure the specific batch with a caliper before machining sockets.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They maintain their magnetic properties even under close interference source,
  • In other words, due to the metallic layer of nickel, the element becomes visually attractive,
  • Magnetic induction on the working layer of the magnet turns out to be extremely intense,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to flexibility in forming and the capacity to modify to complex applications,
  • Huge importance in electronics industry – they serve a role in computer drives, brushless drives, advanced medical instruments, as well as multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of producing threads in the magnet and complicated shapes - recommended is cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these magnets can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The load parameter shown concerns the peak performance, obtained under ideal test conditions, specifically:
  • using a sheet made of low-carbon steel, serving as a ideal flux conductor
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by smoothness
  • with zero gap (without paint)
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

In practice, the real power results from a number of factors, listed from crucial:
  • Distance (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Load vector – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with neodymium magnets
Crushing force

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

Protect data

Very strong magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Sensitization to coating

Medical facts indicate that nickel (the usual finish) is a common allergen. If you have an allergy, prevent touching magnets with bare hands or opt for coated magnets.

Health Danger

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Powerful field

Be careful. Rare earth magnets attract from a long distance and connect with huge force, often faster than you can move away.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Do not overheat magnets

Do not overheat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Machining danger

Mechanical processing of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

No play value

Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Keep out of reach of kids and pets.

Magnets are brittle

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Security! Want to know more? Read our article: Why are neodymium magnets dangerous?