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UMS 32x10.5x5.5x8 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220329

GTIN/EAN: 5906301814191

5.00

Diameter Ø

32 mm [±1 mm]

cone dimension Ø

10.5x5.5 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

37 g

Magnetization Direction

↑ axial

Load capacity

25.00 kg / 245.17 N

Coating

[NiCuNi] Nickel

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12.09 ZŁ with VAT / pcs + price for transport

9.83 ZŁ net + 23% VAT / pcs

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Parameters as well as appearance of a neodymium magnet can be estimated with our our magnetic calculator.

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Technical data - UMS 32x10.5x5.5x8 / N38 - conical magnetic holder

Specification / characteristics - UMS 32x10.5x5.5x8 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220329
GTIN/EAN 5906301814191
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 Ø 32 mm [±1 mm]
cone dimension Ø 10.5x5.5 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 37 g
Magnetization Direction ↑ axial
Load capacity ~ ? 25.00 kg / 245.17 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 32x10.5x5.5x8 / N38 - conical 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
Material specification
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%
Ecology and recycling (GPSR)
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: 220329-2026
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Countersunk magnets are indispensable in carpentry, furniture making, and modeling as hidden closures. Thanks to the hole with a chamfer (conical), the screw head hides in the magnet, ensuring a flat contact surface. The steel cup strengthens the magnet force and protects it from cracking upon impact.
Remember that neodymium breaks easily if the screw is tightened too hard. It is best to use a screw with a countersunk head perfectly matched to the hole. The screw head should not protrude above the magnet surface, but it cannot burst it either.
Two identical magnets (e.g., both N) bought randomly will repel each other with mounting sides. Often a more convenient and cheaper solution is using one magnet and a steel washer (plate) as an armature. Mounting a magnet to a plate eliminates the problem of matching poles and is easier.
This force is measured in ideal laboratory conditions when pulling at a 90-degree angle. To increase friction and prevent sliding, it is worth sticking a piece of rubber or anti-slip tape on the magnet. When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.
A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. It is a more durable and safer solution in everyday use than a bare ring. A bare ring has a dispersed field on both sides but is weaker in point holding.

Pros and cons of Nd2Fe14B magnets.

Pros

Apart from their superior power, neodymium magnets have these key benefits:
  • Their magnetic field is maintained, and after around ten years it drops only by ~1% (according to research),
  • Neodymium magnets are highly resistant to demagnetization caused by external magnetic fields,
  • A magnet with a smooth silver surface is more attractive,
  • Magnetic induction on the top side of the magnet is maximum,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of custom shaping as well as adjusting to complex needs,
  • Universal use in modern industrial fields – they are commonly used in HDD drives, motor assemblies, precision medical tools, and other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

What to avoid - cons of neodymium magnets and ways of using them
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets can complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

The declared magnet strength represents the peak performance, recorded under ideal test conditions, meaning:
  • on a block made of mild steel, perfectly concentrating the magnetic flux
  • with a cross-section of at least 10 mm
  • characterized by smoothness
  • with total lack of distance (without coatings)
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Effective lifting capacity impacted by working environment parameters, such as (from most important):
  • Distance (between the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be lost to the other side.
  • Steel grade – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a small distance between the magnet and the plate decreases the holding force.

Precautions when working with neodymium magnets
Fire risk

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

GPS Danger

A powerful magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Do not bring magnets near a device to avoid breaking the sensors.

Magnetic media

Do not bring magnets close to a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Magnets are brittle

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Danger to the youngest

NdFeB magnets are not toys. Accidental ingestion of several magnets can lead to them attracting across intestines, which constitutes a severe health hazard and necessitates urgent medical intervention.

ICD Warning

Patients with a pacemaker should maintain an safe separation from magnets. The magnetic field can stop the operation of the life-saving device.

Warning for allergy sufferers

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.

Bodily injuries

Large magnets can break fingers instantly. Do not place your hand betwixt two strong magnets.

Conscious usage

Handle magnets with awareness. Their powerful strength can surprise even professionals. Plan your moves and respect their force.

Power loss in heat

Watch the temperature. Exposing the magnet to high heat will destroy its properties and pulling force.

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