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UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220327

GTIN/EAN: 5906301814177

5.00

Diameter Ø

20 mm [±1 mm]

cone dimension Ø

8.6x4.5 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

6.00 kg / 58.84 N

Coating

[NiCuNi] Nickel

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6.46 ZŁ with VAT / pcs + price for transport

5.25 ZŁ net + 23% VAT / pcs

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Physical properties - UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

Specification / characteristics - UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220327
GTIN/EAN 5906301814177
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 20 mm [±1 mm]
cone dimension Ø 8.6x4.5 mm [±1 mm]
Height 7 mm [±1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.00 kg / 58.84 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 20x8.6x4.5x7 / 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
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: 220327-2026
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Pulling force
Magnetic Induction
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This type of holder is perfect for mounting magnetic latches in cabinets, doors, and flaps. 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.
Neodymium magnets are sintered ceramics, which means they are very hard but also brittle. Avoid forceful tightening when you feel resistance. Using too large a countersunk screw may cause the magnetic ring to crack.
Two identical magnets (e.g., both N) bought randomly will repel each other with mounting sides. In our offer, we try to mark or pair holders if explicitly stated in the description. A set of magnet + plate is cheaper and holds just as strongly.
The declared capacity (e.g., 6.00 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. Paint or veneer on metal also reduces effective attraction force.
A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. The housing absorbs impacts, preventing the magnet from crumbling and cracking. The countersunk holder is a professional mounting solution with increased durability.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties as a result of opposing magnetic fields,
  • Thanks to the glossy finish, the layer of nickel, gold-plated, or silver-plated gives an professional appearance,
  • Magnetic induction on the working layer of the magnet turns out to be exceptional,
  • 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...
  • Considering the ability of precise forming and customization to unique needs, neodymium magnets can be manufactured in a wide range of geometric configurations, which increases their versatility,
  • Wide application in innovative solutions – they serve a role in hard drives, electric drive systems, medical devices, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex forms.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Breakaway force was defined for the most favorable conditions, assuming:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • whose thickness equals approx. 10 mm
  • with a surface perfectly flat
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

In real-world applications, the real power results from a number of factors, ranked from crucial:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be wasted into the air.
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and holding force.
  • Base smoothness – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

Warnings
Risk of cracking

Neodymium magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets leads to them breaking into shards.

Implant safety

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Avoid contact if allergic

Studies show that nickel (the usual finish) is a strong allergen. For allergy sufferers, avoid direct skin contact or opt for versions in plastic housing.

Protect data

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Serious injuries

Big blocks can break fingers instantly. Do not place your hand between two attracting surfaces.

Choking Hazard

Strictly keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are tragic.

Combustion hazard

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Maximum temperature

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Powerful field

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Keep away from electronics

Remember: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Safety First! Looking for details? Check our post: Are neodymium magnets dangerous?