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UMS 16x6.5x3.5x5 zestaw 4 szt. / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220553

GTIN/EAN: 5906301815457

Load capacity 5.00 kg / 49.03 N
Diameter Ø
16 mm [±1 mm]
cone dimension Ø
6.5x3.5 mm [±1 mm]
Height
5 mm [±1 mm]
Weight
22 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical specifications »

13.81 zł net / pcs

16.99 zł with VAT (23% VAT) / pcs

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Frequently asked questions

Which magnetic holder is suitable for moving metal parts in a workshop?
Choose a device designed for the intended handling task and check its rated conditions, attachment point and the steel being gripped. A basic permanent-magnet holder is not a certified device for lifting a load over people.
How do I choose a holder for hanging a heavy item and check its real grip?
Compare the catalogue pull rating with the actual steel thickness, surface condition, gap and load direction. Grip along a vertical surface differs from perpendicular pull. Add an independent mechanical safeguard where falling would cause harm.
Which magnetic holders can be used outdoors?
Check the coating, housing and permitted operating conditions on the individual product card. Rubber can help protect a painted surface, but do not assume that every holder is suitable for permanent immersion or salt spray.
How should I choose a strong threaded holder for field work?
Select an internal or external thread to match the part being attached. Then check the holder dimensions, pull rating, surface condition and moisture protection. Dirt and gaps can reduce practical grip.

Guides from the knowledge base

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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical details - UMS 16x6.5x3.5x5 zestaw 4 szt. / N38 - conical magnetic holder

Specification / characteristics - UMS 16x6.5x3.5x5 zestaw 4 szt. / N38 - conical magnetic holder

properties
properties values
Cat. no. 220553
GTIN/EAN 5906301815457
Distributor Dhit sp. z o.o.
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 16 mm [±1 mm]
cone dimension Ø 6.5x3.5 mm [±1 mm]
Height 5 mm [±1 mm]
Weight 22 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.00 kg / 49.03 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 16x6.5x3.5x5 zestaw 4 szt. / N38 - conical magnetic holder
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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%

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: 220553-2026
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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. 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. 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. A set of magnet + plate is cheaper and holds just as strongly.
The declared capacity (e.g., 5.00 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). Paint or veneer on metal also reduces effective attraction force.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. The housing absorbs impacts, preventing the magnet from crumbling and cracking. A bare ring has a dispersed field on both sides but is weaker in point holding.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Apart from their superior holding force, neodymium magnets have these key benefits:
  • Their magnetic field remains stable, and after around ten years it decreases only by ~1% (according to research),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By covering with a reflective coating of silver, the element acquires an professional look,
  • Magnetic induction on the top side of the magnet remains exceptional,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to the ability of accurate forming and customization to specialized requirements, magnetic components can be created in a wide range of forms and dimensions, which expands the range of possible applications,
  • Huge importance in innovative solutions – they are utilized in mass storage devices, drive modules, precision medical tools, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Cons

Problematic aspects of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The lifting capacity listed is a result of laboratory testing conducted under specific, ideal conditions:
  • with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an polished touching surface
  • without the slightest air gap between the magnet and steel
  • under axial force direction (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, mainly (from priority):
  • Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness occurs, immediately stop handling magnets and use protective gear.

Magnetic interference

A powerful magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Pacemakers

Individuals with a heart stimulator must keep an absolute distance from magnets. The magnetism can stop the functioning of the implant.

Protective goggles

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Mechanical processing

Dust produced during grinding of magnets is combustible. Do not drill into magnets unless you are an expert.

Electronic devices

Very strong magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Product not for children

These products are not suitable for play. Accidental ingestion of several magnets may result in them attracting across intestines, which constitutes a severe health hazard and requires immediate surgery.

Safe operation

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Serious injuries

Large magnets can break fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.

Thermal limits

Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.

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