UMT 12x20 black / N38 - board holder
board holder
Catalog no 230285
GTIN/EAN: 5906301814375
Diameter Ø
12 mm [±1 mm]
Height
20 mm [±1 mm]
Weight
3.5 g
Coating
[NiCuNi] Nickel
1.894 ZŁ with VAT / pcs + price for transport
1.540 ZŁ net + 23% VAT / pcs
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Physical properties - UMT 12x20 black / N38 - board holder
Specification / characteristics - UMT 12x20 black / N38 - board holder
| properties | values |
|---|---|
| Cat. no. | 230285 |
| GTIN/EAN | 5906301814375 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±1 mm] |
| Height | 20 mm [±1 mm] |
| Weight | 3.5 g |
| Coating | [NiCuNi] Nickel |
| 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of rare earth magnets.
Advantages
- They have unchanged lifting capacity, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
- Neodymium magnets remain exceptionally resistant to magnetic field loss caused by external field sources,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnets are distinguished by maximum magnetic induction on the active area,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
- Possibility of custom creating as well as adapting to specific needs,
- Versatile presence in advanced technology sectors – they serve a role in data components, electromotive mechanisms, medical devices, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in small systems
Cons
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend 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 strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating nuts and complicated forms in magnets, we recommend using casing - magnetic holder.
- Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices are able to complicate diagnosis medical after entering the body.
- With large orders the cost of neodymium magnets is economically unviable,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what affects it?
- on a plate made of mild steel, optimally conducting the magnetic flux
- whose transverse dimension equals approx. 10 mm
- with a surface cleaned and smooth
- with direct contact (no paint)
- under perpendicular force vector (90-degree angle)
- at room temperature
Practical aspects of lifting capacity – factors
- Air gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
- Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Crushing force
Mind your fingers. Two large magnets will join immediately with a force of massive weight, crushing anything in their path. Be careful!
Eye protection
Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
Thermal limits
Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.
Electronic devices
Equipment safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).
Threat to navigation
Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.
Dust is flammable
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Nickel coating and allergies
Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, immediately stop handling magnets and use protective gear.
Life threat
Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Caution required
Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often faster than you can move away.
Choking Hazard
Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Keep away from kids and pets.
Tabela kosztu i czasu dostawy
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Płatność przy odbiorze (pobranie):
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23.00 ZŁ
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