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

conical magnetic holder

Catalog no 220327

GTIN/EAN: 5906301814177

5.00
Load capacity 6.00 kg / 58.84 N
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
Coating
[NiCuNi] Nickel
check technical specifications »

5.25 zł net / pcs

6.46 zł with VAT (23% VAT) / pcs

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Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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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 310 °C
Curie Temperature TF 590 °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

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%

Sustainability

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
Measurement Calculator

Pulling force

Field Strength

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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. Model UMS 20x8.6x4.5x7 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.
Neodymium magnets are sintered ceramics, which means they are very hard but also brittle. 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.
The declared capacity (e.g., 6.00 kg) refers to the perpendicular force needed to detach the magnet from thick steel. To increase friction and prevent sliding, it is worth sticking a piece of rubber or anti-slip tape on the magnet. 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.

Pros as well as cons of neodymium magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain attractive force for almost 10 years – the loss is just ~1% (in theory),
  • They maintain their magnetic properties even under external field action,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the working part of the magnet remains strong,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in forming and the ability to adapt to unusual requirements,
  • Significant place in advanced technology sectors – they serve a role in HDD drives, drive modules, medical equipment, as well as technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets decrease their force 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing threads in the magnet and complex shapes - preferred is a housing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

The force parameter is a measurement result conducted under the following configuration:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane perfectly flat
  • with direct contact (without impurities)
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

What influences lifting capacity in practice

Real force is affected by specific conditions, including (from priority):
  • Distance (betwixt the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Angle of force application – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost to the other side.
  • Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Safe handling of NdFeB magnets
Permanent damage

Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Fire warning

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Do not give to children

Strictly keep magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are fatal.

Nickel allergy

A percentage of the population suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact might lead to a rash. We strongly advise use safety gloves.

Compass and GPS

Navigation devices and smartphones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Safe operation

Exercise caution. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Magnet fragility

Watch out for shards. Magnets can fracture upon violent connection, ejecting shards into the air. Wear goggles.

Implant safety

Patients with a heart stimulator must maintain an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Safe distance

Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Pinching danger

Large magnets can crush fingers in a fraction of a second. Never place your hand between two attracting surfaces.

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