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UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180418

GTIN/EAN: 5906301813774

5.00

Diameter Ø

48 mm [±1 mm]

Height

24 mm [±1 mm]

Height

11.5 mm [±1 mm]

Weight

140 g

Magnetization Direction

↑ axial

Load capacity

80.00 kg / 784.53 N

Coating

[NiCuNi] Nickel

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Technical details - UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

Specification / characteristics - UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180418
GTIN/EAN 5906301813774
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]
Height 24 mm [±1 mm]
Height 11.5 mm [±1 mm]
Weight 140 g
Magnetization Direction ↑ axial
Load capacity ~ ? 80.00 kg / 784.53 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread
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: 180418-2026
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Force (pull)
Field Strength
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The steel cup acts as an armature, concentrating the magnetic flux and increasing capacity even several times. Thanks to this, the holder is more durable, resistant, and safer to mount. The threaded hole allows creating a functional mounting point in seconds.
Too long a screw can pass through the bushing and push out or damage the magnet glued into the bottom of the cup. If the screw reaches the bottom of the bushing and is further tightened forcefully, it will destroy the magnet. It is worth securing the thread with thread glue if the connection is to be durable and resistant to vibrations.
They are indispensable when building exhibition stands and shop displays (POS systems). They enable creating demountable connections that can be easily moved. Ideal for fixing lighting on machine tools and welding tables.
The stated force is the maximum laboratory value obtained on a clean, smooth sheet. On a thin surface or painted cabinet, the magnet will hold much weaker (even by 50-70%). For side detachment (sliding), the force is only approx. 1/3 of nominal capacity.
Steel cups are usually coated with a layer of nickel (shiny) or zinc (matte/bright), providing basic protection. In rain and frost, the coating may degrade over time if not protected. The neodymium magnet itself inside is also nickel-plated.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an professional appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the capacity to customize to client solutions,
  • Key role in innovative solutions – they are commonly used in mass storage devices, motor assemblies, precision medical tools, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Limitations

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • They are prone to damage upon too strong 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
  • When exposed to high temperature, neodymium magnets suffer a drop in force. 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 corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of making threads in the magnet and complex shapes - recommended is casing - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

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

The specified lifting capacity represents the peak performance, recorded under laboratory conditions, specifically:
  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • with a thickness minimum 10 mm
  • characterized by even structure
  • under conditions of gap-free contact (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • at standard ambient temperature

What influences lifting capacity in practice

It is worth knowing that the working load will differ depending on elements below, in order of importance:
  • Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel does not accept the full field, causing part of the power to be wasted to the other side.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Danger to pacemakers

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Electronic hazard

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Combustion hazard

Powder created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Sensitization to coating

A percentage of the population suffer from a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling might lead to skin redness. We suggest wear safety gloves.

Finger safety

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Magnets are brittle

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Precision electronics

Note: neodymium magnets produce a field that confuses sensitive sensors. Maintain a safe distance from your mobile, tablet, and GPS.

Respect the power

Handle with care. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can move away.

Danger to the youngest

Neodymium magnets are not suitable for play. Eating a few magnets can lead to them pinching intestinal walls, which poses a critical condition and necessitates urgent medical intervention.

Demagnetization risk

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?