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UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220403

GTIN/EAN: 5906301814221

5.00

Diameter Ø

48 mm [±1 mm]

cone dimension Ø

18x8.5 mm [±1 mm]

Height

11.5 mm [±1 mm]

Weight

125 g

Magnetization Direction

↑ axial

Load capacity

68.00 kg / 666.85 N

Coating

[NiCuNi] Nickel

product parameters »

44.92 ZŁ with VAT / pcs + price for transport

36.52 ZŁ net + 23% VAT / pcs

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Weight and appearance of neodymium magnets can be checked using our magnetic mass calculator.

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Technical of the product - UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

Specification / characteristics - UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220403
GTIN/EAN 5906301814221
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 48 mm [±1 mm]
cone dimension Ø 18x8.5 mm [±1 mm]
Height 11.5 mm [±1 mm]
Weight 125 g
Magnetization Direction ↑ axial
Load capacity ~ ? 68.00 kg / 666.85 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 48x18x8.5x11.5 / 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 and environmental data
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%
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: 220403-2026
Measurement Calculator
Pulling force
Magnetic Induction
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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 48x18x8.5x11.5 / 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. 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. 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.
A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. Furthermore, steel protects the brittle neodymium from mechanical damage when closing cabinets (impacts). A bare ring has a dispersed field on both sides but is weaker in point holding.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even during nearly ten years – the reduction in strength is only ~1% (theoretically),
  • Magnets perfectly defend themselves against demagnetization caused by external fields,
  • A magnet with a metallic nickel surface has better aesthetics,
  • Magnets have extremely high magnetic induction on the surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Possibility of exact modeling as well as modifying to precise conditions,
  • Versatile presence in advanced technology sectors – they are commonly used in hard drives, motor assemblies, diagnostic systems, and other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic holder, due to difficulties in producing threads inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these devices are able to be problematic in diagnostics 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

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Breakaway force was determined for ideal contact conditions, taking into account:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting 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 real power is determined by several key aspects, presented from most significant:
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Protect data

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Bodily injuries

Risk of injury: The pulling power is so great that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Compass and GPS

A strong magnetic field negatively affects the operation of compasses in phones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.

Medical interference

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Heat warning

Do not overheat. Neodymium magnets are susceptible to heat. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Magnets are brittle

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Allergy Warning

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, immediately stop handling magnets and use protective gear.

Combustion hazard

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

Adults only

NdFeB magnets are not intended for children. Eating multiple magnets can lead to them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.

Respect the power

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Danger! More info about hazards in the article: Magnet Safety Guide.