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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

Coating

[NiCuNi] Nickel

check properties »

12.23 ZŁ with VAT / pcs + price for transport

9.94 ZŁ net + 23% VAT / pcs

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Physical properties - 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
Coating [NiCuNi] Nickel
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 specification and ecology
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%
Sustainability
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
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A magnet with a built-in screw is great for screwing with a nut to housings, profiles, and flat bars. Just pass the thread through the hole in the element and tighten the nut on the other side. Used for mounting sensors, panels, plates, and exhibition elements.
The screw is solidly seated in the cup, however, moderation must be maintained when tightening the nut. 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.
Standard neodymium holders are adapted to work in temperatures up to 80°C. For furnaces, dryers, and powder coating shops, we recommend other types of magnets. Avoid mounting directly on hot engine or machine components.
Thread size (e.g., M6) is always given in the product name and technical specification. Stud length varies depending on the model (usually from 8 to 15 mm). 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 and disadvantages of Nd2Fe14B magnets.

Pros

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They have stable power, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • They possess excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
  • By using a lustrous coating of gold, the element presents an elegant look,
  • Magnetic induction on the working part of the magnet is maximum,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
  • Thanks to the potential of free molding and customization to individualized needs, magnetic components can be created in a broad palette of shapes and sizes, which increases their versatility,
  • Versatile presence in advanced technology sectors – they are commonly used in hard drives, electric motors, medical equipment, and technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
  • 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 as well as corrosion.
  • We recommend a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

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

Breakaway force was defined for ideal contact conditions, taking into account:
  • using a sheet made of high-permeability steel, serving as a magnetic yoke
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • with direct contact (without paint)
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature room level

Determinants of lifting force in real conditions

Holding efficiency is influenced by working environment parameters, mainly (from most important):
  • Clearance – existence of any layer (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Steel type – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Nickel allergy

Certain individuals suffer from a contact allergy to Ni, which is the standard coating for NdFeB magnets. Frequent touching may cause a rash. It is best to wear protective gloves.

Material brittleness

Protect your eyes. Magnets can explode upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Mechanical processing

Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Bone fractures

Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Immense force

Use magnets with awareness. Their immense force can surprise even professionals. Plan your moves and do not underestimate their power.

Health Danger

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Keep away from children

Neodymium magnets are not toys. Eating several magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates urgent medical intervention.

Cards and drives

Device Safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

Thermal limits

Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and strength.

Precision electronics

GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Caution! More info about hazards in the article: Magnet Safety Guide.