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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

check properties »

4.48 ZŁ with VAT / pcs + price for transport

3.64 ZŁ net + 23% VAT / pcs

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Physical properties - 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
Elemental analysis
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
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Countersunk magnets are indispensable in carpentry, furniture making, and modeling as hidden closures. The ability to flush the screw with the magnet surface allows for perfect closing without gaps. 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. Mounting a magnet to a plate eliminates the problem of matching poles and is easier.
This value is the maximum achievement a magnet can obtain on a thick sheet. 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.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. Furthermore, steel protects the brittle neodymium from mechanical damage when closing cabinets (impacts). The countersunk holder is a professional mounting solution with increased durability.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain full power for around 10 years – the drop is just ~1% (according to analyses),
  • They retain their magnetic properties even under external field action,
  • By applying a decorative coating of gold, the element gains an proper look,
  • Magnets are distinguished by exceptionally strong magnetic induction on the working surface,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of detailed forming and optimizing to individual applications,
  • Significant place in modern technologies – they serve a role in mass storage devices, electric motors, medical equipment, also complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Cons of neodymium magnets: tips and applications.
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making threads in the magnet and complicated shapes - recommended is casing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Additionally, small components of these products are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 5.00 kg is a measurement result performed under the following configuration:
  • on a base made of structural steel, optimally conducting the magnetic flux
  • whose thickness is min. 10 mm
  • with a surface perfectly flat
  • with direct contact (without paint)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

During everyday use, the actual holding force is determined by many variables, ranked from the most important:
  • Gap (betwixt the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy steels lower magnetic properties and holding force.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Crushing force

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

Avoid contact if allergic

Some people experience a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact may cause skin redness. We recommend wear safety gloves.

Handling rules

Be careful. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can move away.

Protective goggles

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

This is not a toy

Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are tragic.

Thermal limits

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Fire warning

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

Magnetic media

Do not bring magnets near a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

ICD Warning

People with a pacemaker should maintain an safe separation from magnets. The magnetism can disrupt the operation of the life-saving device.

Compass and GPS

Note: rare earth magnets produce a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Caution! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98