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UMS 32x10.5x5.5x8 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220329

GTIN/EAN: 5906301814191

5.00
Load capacity 25.00 kg / 245.17 N
Diameter Ø
32 mm [±1 mm]
cone dimension Ø
10.5x5.5 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
37 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical parameters »

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Parameters as well as form of neodymium magnets can be analyzed on our power calculator.

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Technical of the product - UMS 32x10.5x5.5x8 / N38 - conical magnetic holder

Specification / characteristics - UMS 32x10.5x5.5x8 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220329
GTIN/EAN 5906301814191
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 32 mm [±1 mm]
cone dimension Ø 10.5x5.5 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 37 g
Magnetization Direction ↑ axial
Load capacity ~ ? 25.00 kg / 245.17 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 32x10.5x5.5x8 / 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

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%

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: 220329-2026
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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 32x10.5x5.5x8 / 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. It is best to use a screw with a countersunk head perfectly matched to the hole. 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. Often a more convenient and cheaper solution is using one magnet and a steel washer (plate) as an armature. 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. If the magnet hangs vertically, gravity causes it to slide with much less load. 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). The countersunk holder is a professional mounting solution with increased durability.

Advantages as well as disadvantages of neodymium magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after around ten years it decreases only by ~1% (according to research),
  • They do not lose their magnetic properties even under external field action,
  • In other words, due to the shiny surface of nickel, the element gains visual value,
  • Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Due to the potential of flexible shaping and customization to custom requirements, magnetic components can be modeled in a broad palette of geometric configurations, which amplifies use scope,
  • Universal use in high-tech industry – they are used in hard drives, motor assemblies, diagnostic systems, also multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of producing nuts in the magnet and complex shapes - preferred is casing - magnet mounting.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Additionally, small components of these products are able to complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Maximum magnetic pulling force – what affects it?

Breakaway force was defined for ideal contact conditions, taking into account:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • whose thickness reaches at least 10 mm
  • characterized by smoothness
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Real force is affected by specific conditions, including (from priority):
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Stainless steels may attract less.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Implant safety

Patients with a pacemaker must maintain an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.

Heat sensitivity

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.

Keep away from computers

Do not bring magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

GPS Danger

An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Skin irritation risks

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop working with magnets and use protective gear.

Respect the power

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

Swallowing risk

Absolutely keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are fatal.

Dust is flammable

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Magnets are brittle

Neodymium magnets are sintered ceramics, which means they are very brittle. Impact of two magnets leads to them cracking into shards.

Pinching danger

Watch your fingers. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Security! Want to know more? Check our post: Why are neodymium magnets dangerous?