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UMS 75x19x10.5x18 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220405

GTIN/EAN: 5906301814245

5.00

Diameter Ø

75 mm [±1 mm]

cone dimension Ø

19x10.5 mm [±1 mm]

Height

18 mm [±1 mm]

Weight

465 g

Magnetization Direction

↑ axial

Load capacity

162.00 kg / 1588.68 N

Coating

[NiCuNi] Nickel

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125.56 ZŁ with VAT / pcs + price for transport

102.08 ZŁ net + 23% VAT / pcs

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Technical specification - UMS 75x19x10.5x18 / N38 - conical magnetic holder

Specification / characteristics - UMS 75x19x10.5x18 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220405
GTIN/EAN 5906301814245
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 75 mm [±1 mm]
cone dimension Ø 19x10.5 mm [±1 mm]
Height 18 mm [±1 mm]
Weight 465 g
Magnetization Direction ↑ axial
Load capacity ~ ? 162.00 kg / 1588.68 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 75x19x10.5x18 / 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
Engineering data and GPSR
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%
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: 220405-2026
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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. Model UMS 75x19x10.5x18 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.
Remember that neodymium breaks easily if the screw is tightened too hard. Avoid forceful tightening when you feel resistance. Using too large a countersunk screw may cause the magnetic ring to crack.
To create a pair (magnet-magnet), you need one holder with an N pole on the chamfer and another with an S pole. 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.
The declared capacity (e.g., 162.00 kg) refers to the perpendicular force needed to detach the magnet from thick steel. If the magnet hangs vertically, gravity causes it to slide with much less load. When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. Furthermore, steel protects the brittle neodymium from mechanical damage when closing cabinets (impacts). A bare ring has a dispersed field on both sides but is weaker in point holding.

Advantages and disadvantages of neodymium magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They retain their magnetic properties even under close interference source,
  • By applying a smooth coating of nickel, the element gains an modern look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • In view of the possibility of precise shaping and customization to individualized projects, magnetic components can be created in a broad palette of forms and dimensions, which expands the range of possible applications,
  • Versatile presence in future technologies – they find application in data components, electromotive mechanisms, precision medical tools, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their strength 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 durability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

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

Breakaway force was determined for the most favorable conditions, assuming:
  • using a sheet made of high-permeability steel, functioning as a ideal flux conductor
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • with zero gap (without coatings)
  • under axial application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by working environment parameters, mainly (from most important):
  • Distance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Safe operation

Use magnets consciously. Their huge power can shock even professionals. Plan your moves and do not underestimate their power.

Do not give to children

Only for adults. Tiny parts can be swallowed, causing serious injuries. Keep out of reach of children and animals.

Warning for allergy sufferers

Certain individuals suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause a rash. We recommend wear safety gloves.

Serious injuries

Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Phone sensors

Navigation devices and smartphones are extremely susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Risk of cracking

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

ICD Warning

Individuals with a ICD must keep an large gap from magnets. The magnetic field can stop the operation of the implant.

Heat sensitivity

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its properties and strength.

Flammability

Machining of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Electronic devices

Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?