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

conical magnetic holder

Catalog no 220326

GTIN/EAN: 5906301814160

5.00

Diameter Ø

16 mm [±1 mm]

cone dimension Ø

6.5x3.5 mm [±1 mm]

Height

5 mm [±1 mm]

Weight

5.5 g

Magnetization Direction

↑ axial

Load capacity

5.00 kg / 49.03 N

Coating

[NiCuNi] Nickel

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4.48 ZŁ with VAT / pcs + price for transport

3.64 ZŁ net + 23% VAT / pcs

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Detailed specification - UMS 16x6.5x3.5x5 / N38 - conical magnetic holder

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

properties
properties values
Cat. no. 220326
GTIN/EAN 5906301814160
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 16 mm [±1 mm]
cone dimension Ø 6.5x3.5 mm [±1 mm]
Height 5 mm [±1 mm]
Weight 5.5 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 / 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
Technical specification and ecology
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%
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: 220326-2026
Quick Unit Converter
Magnet pull force
Field Strength
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Countersunk magnets are indispensable in carpentry, furniture making, and modeling as hidden closures. The holder can be screwed directly to wood, wall, metal, or plastic. Model UMS 16x6.5x3.5x5 / 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. 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. If you need a pair, ask about availability of complementary sets or check the description. A set of magnet + plate is cheaper and holds just as strongly.
This force is measured in ideal laboratory conditions when pulling at a 90-degree angle. 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.
A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. It is a more durable and safer solution in everyday use than a bare ring. The countersunk holder is a professional mounting solution with increased durability.

Pros and cons of Nd2Fe14B magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose strength, even after around ten years – the drop in power is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by external field influence,
  • In other words, due to the metallic layer of silver, the element becomes visually attractive,
  • Magnets are characterized by very high magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the potential of flexible shaping and adaptation to unique needs, NdFeB magnets can be created in a variety of forms and dimensions, which amplifies use scope,
  • Versatile presence in electronics industry – they are used in HDD drives, electromotive mechanisms, medical devices, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices are able to complicate diagnosis medical after entering the body.
  • Due to complex production process, their price is higher than average,

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Holding force of 5.00 kg is a measurement result executed under specific, ideal conditions:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

In real-world applications, the actual lifting capacity results from several key aspects, presented from the most important:
  • Distance (between the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the power to be wasted into the air.
  • Steel grade – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Implant safety

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Safe operation

Exercise caution. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can react.

Nickel coating and allergies

It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, avoid direct skin contact and select coated magnets.

Magnets are brittle

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Keep away from computers

Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Hand protection

Large magnets can crush fingers instantly. Never put your hand betwixt two strong magnets.

Maximum temperature

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Danger to the youngest

NdFeB magnets are not toys. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.

Compass and GPS

Be aware: neodymium magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

Dust is flammable

Powder generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Important! Details about risks in the article: Safety of working with magnets.