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UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190323

GTIN/EAN: 5906301813828

5.00

Diameter Ø

25 mm [±1 mm]

Height

17 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

25 g

Load capacity

17.00 kg / 166.71 N

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12.23 ZŁ with VAT / pcs + price for transport

9.94 ZŁ net + 23% VAT / pcs

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Detailed specification - UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

Specification / characteristics - UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

properties
properties values
Cat. no. 190323
GTIN/EAN 5906301813828
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 g
Load capacity ~ ? 17.00 kg / 166.71 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external 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
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%
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: 190323-2026
Magnet Unit Converter
Magnet pull force
Field Strength
Type data in one of the inputs, to see all other values convert in real-time.

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A magnet with a built-in screw is great for screwing with a nut to housings, profiles, and flat bars. Mounting consists of inserting the screw into the hole and securing with a nut (e.g., wing nut). Used for mounting sensors, panels, plates, and exhibition elements.
The threaded stud is an integral part of the steel housing, but avoid overtightening the thread. When assembling, use a torque wrench or tighten with feeling. The magnet itself is protected by a steel cup and is very resistant to impact.
Maximum operating temperature is 80 degrees Celsius for the standard version. We also offer holders made of ferrite magnets (resistant up to 200°C) or special high-temperature versions. Remember that even momentary overheating can weaken the holder.
Holders are equipped with standard metric threads (e.g., M4, M6, M8, M10). Exact screw dimensions can be found in the product technical table. The thread is made of galvanized steel, ensuring corrosion resistance.
The magnetic system in a cup is more energy-efficient than the magnet itself of the same dimensions. However, such a system works point-wise and requires direct contact with metal.

Advantages as well as disadvantages of rare earth magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose strength, even after around 10 years – the decrease in lifting capacity is only ~1% (according to tests),
  • Magnets very well defend themselves against demagnetization caused by foreign field sources,
  • By covering with a lustrous layer of gold, the element acquires an nice look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in constructing and the capacity to customize to unusual requirements,
  • Huge importance in electronics industry – they are commonly used in data components, electric motors, precision medical tools, as well as modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Cons of neodymium magnets and ways of using them
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their 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 oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of producing nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these devices can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

The load parameter shown concerns the peak performance, obtained under laboratory conditions, namely:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • with a cross-section minimum 10 mm
  • with an ideally smooth contact surface
  • without any air gap between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • in stable room temperature

Determinants of lifting force in real conditions

In practice, the actual holding force is determined by several key aspects, ranked from most significant:
  • Air gap (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – too thin steel does not accept the full field, causing part of the power to be lost into the air.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
  • Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Powerful field

Be careful. Neodymium magnets attract from a long distance and snap with huge force, often faster than you can move away.

Crushing force

Danger of trauma: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Flammability

Machining of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Heat sensitivity

Avoid heat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Risk of cracking

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Nickel allergy

It is widely known that nickel (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or select encased magnets.

Magnetic media

Intense magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Precision electronics

An intense magnetic field negatively affects the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.

Choking Hazard

Absolutely store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are fatal.

Danger to pacemakers

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Security! Want to know more? Read our article: Why are neodymium magnets dangerous?