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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

technical specifications »

6.46 ZŁ with VAT / pcs + price for transport

5.25 ZŁ net + 23% VAT / pcs

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Technical of the product - 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
Magnet Unit Converter
Force (pull)
Magnetic Induction
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It is the most popular solution for creating aesthetic, invisible door locks. The holder can be screwed directly to wood, wall, metal, or plastic. Model UMS 20x8.6x4.5x7 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.
Despite the steel housing, the magnet itself is prone to cracking under strong point pressure. We recommend tightening manually with feeling (screwdriver), not an impact driver. The screw head should not protrude above the magnet surface, but it cannot burst it either.
For two magnets screwed with cones facing each other (faces) to attract, they must have different polarity. 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., 6.00 kg) refers to the perpendicular force needed to detach the magnet from thick steel. In practice, when mounted on a wall (shear force), the magnet will hold significantly less (approx. 20-30% of nominal). When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.
Thanks to the metal cup, the magnetic field is concentrated on the active side, which significantly increases force. The housing absorbs impacts, preventing the magnet from crumbling and cracking. The countersunk holder is a professional mounting solution with increased durability.

Pros and cons of rare earth magnets.

Strengths

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They feature excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
  • Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
  • Magnetic induction on the surface of the magnet turns out to be extremely intense,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to flexibility in designing and the ability to modify to individual projects,
  • Universal use in advanced technology sectors – they are commonly used in data components, electric motors, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • 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.
  • When exposed to high temperature, neodymium magnets experience 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small components of these devices are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what it depends on?

Breakaway force was determined for the most favorable conditions, taking into account:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an ground contact surface
  • without the slightest air gap between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

Please note that the magnet holding will differ subject to the following factors, starting with the most relevant:
  • Air gap (betwixt the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be lost into the air.
  • Steel type – mild steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the load capacity.

H&S for magnets
Skin irritation risks

It is widely known that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact or choose versions in plastic housing.

Dust is flammable

Powder created during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Crushing force

Protect your hands. Two powerful magnets will snap together instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Heat warning

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

Material brittleness

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Phone sensors

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Conscious usage

Use magnets with awareness. Their powerful strength can surprise even professionals. Be vigilant and do not underestimate their force.

Product not for children

Only for adults. Small elements can be swallowed, leading to serious injuries. Store away from children and animals.

Electronic devices

Powerful magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Life threat

People with a heart stimulator have to keep an absolute distance from magnets. The magnetism can stop the operation of the implant.

Caution! Learn more about hazards in the article: Safety of working with magnets.