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UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread
magnetic holder external thread
Catalog no 190323
GTIN/EAN: 5906301813828
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
12.23 ZŁ with VAT / pcs + price for transport
9.94 ZŁ net + 23% VAT / pcs
bulk discounts:
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UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread
Specification / characteristics UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread
| properties | values |
|---|---|
| Cat. no. | 190323 |
| GTIN/EAN | 5906301813828 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 |
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of neodymium magnets.
Strengths
- They do not lose magnetism, even during nearly ten years – the reduction in power is only ~1% (theoretically),
- They do not lose their magnetic properties even under external field action,
- Thanks to the reflective finish, the plating of nickel, gold-plated, or silver-plated gives an elegant appearance,
- Magnetic induction on the top side of the magnet remains strong,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- In view of the possibility of accurate forming and customization to custom needs, neodymium magnets can be modeled in a variety of shapes and sizes, which amplifies use scope,
- Fundamental importance in future technologies – they are utilized in hard drives, electric motors, medical equipment, also complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices
Cons
- At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
- Due to limitations in producing nuts and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
- Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- 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
Pull force analysis
Magnetic strength at its maximum – what contributes to it?
- with the application of a yoke made of special test steel, ensuring maximum field concentration
- whose thickness is min. 10 mm
- characterized by even structure
- under conditions of no distance (surface-to-surface)
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Lifting capacity in real conditions – factors
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Steel type – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and holding force.
- Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.
Cards and drives
Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.
Handling rules
Use magnets with awareness. Their huge power can surprise even professionals. Be vigilant and do not underestimate their power.
Warning for heart patients
Patients with a ICD must maintain an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.
Fire risk
Powder created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Eye protection
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Impact on smartphones
GPS units and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.
Crushing force
Mind your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!
Choking Hazard
Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are life-threatening.
Warning for allergy sufferers
Studies show that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, refrain from direct skin contact and choose versions in plastic housing.
Thermal limits
Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Tabela kosztu i czasu dostawy
Płatność przed wysyłką:
GLS kurier
Przesyłka będzie u Ciebie za 2-3 dni
14.99 ZŁ
InPost Paczkomaty 24/7
Przesyłka będzie u Ciebie za 1-2 dni
12.30 ZŁ
Płatność przy odbiorze (pobranie):
GLS kurier
Przesyłka będzie u Ciebie za 1-2 dni
23.00 ZŁ
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