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UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180317

GTIN/EAN: 5906301813736

5.00

Diameter Ø

25 mm [±1 mm]

Height

17 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

25.4 g

Magnetization Direction

↑ axial

Load capacity

17.00 kg / 166.71 N

Coating

[NiCuNi] Nickel

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11.91 ZŁ with VAT / pcs + price for transport

9.68 ZŁ net + 23% VAT / pcs

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Lifting power as well as appearance of a neodymium magnet can be calculated with our magnetic calculator.

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Product card - UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

Specification / characteristics - UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180317
GTIN/EAN 5906301813736
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 25 mm [±1 mm]
Height 17 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 25.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 17.00 kg / 166.71 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 25x17x8 [M5] 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
Engineering data and GPSR
Material specification
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: 180317-2026
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A magnetic holder (magnet in a steel cup) is much stronger on one side than a bare magnet of the same dimensions. The metal cover secures the magnet against mechanical damage, which is common in workshop conditions. The threaded hole allows creating a functional mounting point in seconds.
The most important rule is choosing the appropriate length of the screw being screwed in. If the screw reaches the bottom of the bushing and is further tightened forcefully, it will destroy the magnet. You can use a spacer washer or lock nut to limit screwing depth.
They are indispensable when building exhibition stands and shop displays (POS systems). They serve as a base for hooks, cable holders, organizers, and lighting systems. Ideal for fixing lighting on machine tools and welding tables.
Nominal capacity (for this model approx. 17.00 kg) is measured in ideal conditions: perpendicular detachment from thick steel (min. 10mm). Air gap (rust, paint, dirt) also drastically lowers holding power. For side detachment (sliding), the force is only approx. 1/3 of nominal capacity.
The housing has anti-corrosion protection in the form of galvanic zinc or nickel plating. 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.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They retain attractive force for almost ten years – the loss is just ~1% (based on simulations),
  • Neodymium magnets remain extremely resistant to demagnetization caused by external field sources,
  • A magnet with a shiny gold surface has an effective appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small surface, which increases force concentration,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the option of accurate molding and customization to individualized solutions, neodymium magnets can be created in a variety of geometric configurations, which increases their versatility,
  • Wide application in future technologies – they find application in computer drives, drive modules, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in producing threads and complex forms in magnets, we recommend using cover - magnetic mount.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what affects it?

Holding force of 17.00 kg is a result of laboratory testing conducted under standard conditions:
  • on a base made of structural steel, perfectly concentrating the magnetic field
  • whose thickness equals approx. 10 mm
  • with an ground touching surface
  • with zero gap (no coatings)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

In practice, the actual lifting capacity results from many variables, ranked from crucial:
  • Air gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost to the other side.
  • Plate material – low-carbon steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.

Warnings
Threat to navigation

GPS units and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Magnet fragility

Watch out for shards. Magnets can fracture upon violent connection, launching shards into the air. Wear goggles.

Bodily injuries

Pinching hazard: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Pacemakers

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

Caution required

Handle magnets consciously. Their powerful strength can surprise even experienced users. Plan your moves and respect their force.

Warning for allergy sufferers

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and wear gloves.

Maximum temperature

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. Damage is permanent.

Fire risk

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Electronic devices

Data protection: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

Danger to the youngest

Only for adults. Small elements pose a choking risk, leading to intestinal necrosis. Keep away from children and animals.

Safety First! Looking for details? Read our article: Why are neodymium magnets dangerous?