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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

see technical data »

44.92 ZŁ with VAT / pcs + price for transport

36.52 ZŁ net + 23% VAT / pcs

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Product card - 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%
Ecology and recycling (GPSR)
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
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This type of holder is perfect for mounting magnetic latches in cabinets, doors, and flaps. 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.
Despite the steel housing, the magnet itself is prone to cracking under strong point pressure. Avoid forceful tightening when you feel resistance. Using too large a countersunk screw may cause the magnetic ring to crack.
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.
The declared capacity (e.g., 68.00 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). 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. A bare ring has a dispersed field on both sides but is weaker in point holding.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They retain magnetic properties for nearly 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets remain remarkably resistant to magnetic field loss caused by external field sources,
  • In other words, due to the reflective finish of silver, the element gains visual value,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of precise shaping and modifying to individual needs,
  • Universal use in modern industrial fields – they are utilized in computer drives, electric drive systems, precision medical tools, and multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Cons of neodymium magnets and ways of using them
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic mount.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:
  • on a block made of mild steel, effectively closing the magnetic flux
  • with a cross-section no less than 10 mm
  • characterized by even structure
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Holding efficiency impacted by working environment parameters, such as (from priority):
  • Distance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Plate material – mild steel gives the best results. Alloy steels lower magnetic properties and holding force.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
No play value

Absolutely keep magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are fatal.

GPS Danger

Note: rare earth magnets generate a field that confuses precision electronics. Keep a safe distance from your mobile, device, and GPS.

Do not underestimate power

Handle with care. Neodymium magnets act from a long distance and connect with huge force, often faster than you can react.

Electronic hazard

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Heat sensitivity

Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Risk of cracking

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Nickel allergy

A percentage of the population suffer from a contact allergy to Ni, which is the common plating for NdFeB magnets. Frequent touching can result in a rash. We strongly advise use safety gloves.

Medical implants

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Crushing force

Pinching hazard: The pulling power is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Fire risk

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Attention! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98