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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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Technical specification of the product - 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%
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: 220326-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
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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. 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. We recommend tightening manually with feeling (screwdriver), not an impact driver. 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. In our offer, we try to mark or pair holders if explicitly stated in 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. To increase friction and prevent sliding, it is worth sticking a piece of rubber or anti-slip tape on the magnet. 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. The housing absorbs impacts, preventing the magnet from crumbling and cracking. The countersunk holder is a professional mounting solution with increased durability.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Apart from their notable holding force, neodymium magnets have these key benefits:
  • Their power is durable, and after around 10 years it drops only by ~1% (theoretically),
  • Neodymium magnets remain extremely resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a metallic nickel surface looks better,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Possibility of exact shaping and adjusting to defined conditions,
  • Fundamental importance in advanced technology sectors – they serve a role in data components, electric drive systems, advanced medical instruments, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing nuts in the magnet and complicated shapes - preferred is casing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products can disrupt the diagnostic process 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

Maximum holding power of the magnet – what contributes to it?

The specified lifting capacity represents the peak performance, recorded under ideal test conditions, meaning:
  • with the contact of a yoke made of special test steel, ensuring maximum field concentration
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with a plane cleaned and smooth
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower depending on the following factors, in order of importance:
  • Clearance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note 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 – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment weakens 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 attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.

Safety rules for work with neodymium magnets
Cards and drives

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Compass and GPS

GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Physical harm

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Warning for heart patients

Individuals with a ICD have to keep an large gap from magnets. The magnetic field can stop the operation of the life-saving device.

Danger to the youngest

NdFeB magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them attracting across intestines, which poses a critical condition and requires urgent medical intervention.

Nickel coating and allergies

Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands or select encased magnets.

Operating temperature

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Dust is flammable

Powder created during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Shattering risk

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Immense force

Use magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their power.

Safety First! More info about risks in the article: Safety of working with magnets.