UMT 20x25 white / N38 - board holder
board holder
Catalog no 230262
GTIN/EAN: 5906301814252
Diameter Ø
20 mm [±1 mm]
Height
25 mm [±1 mm]
Weight
7 g
Coating
[NiCuNi] Nickel
3.49 ZŁ with VAT / pcs + price for transport
2.84 ZŁ net + 23% VAT / pcs
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Technical parameters - UMT 20x25 white / N38 - board holder
Specification / characteristics - UMT 20x25 white / N38 - board holder
| properties | values |
|---|---|
| Cat. no. | 230262 |
| GTIN/EAN | 5906301814252 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±1 mm] |
| Height | 25 mm [±1 mm] |
| Weight | 7 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 |
Other offers
Strengths as well as weaknesses of Nd2Fe14B magnets.
Strengths
- Their strength is maintained, and after around ten years it drops only by ~1% (according to research),
- Magnets very well resist against loss of magnetization caused by external fields,
- The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Due to the potential of accurate molding and customization to specialized projects, NdFeB magnets can be created in a variety of forms and dimensions, which increases their versatility,
- Versatile presence in modern industrial fields – they are commonly used in hard drives, motor assemblies, diagnostic systems, and technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Disadvantages
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
- 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.
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
- We suggest a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
- Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Detachment force of the magnet in optimal conditions – what affects it?
- using a base made of mild steel, acting as a ideal flux conductor
- whose thickness reaches at least 10 mm
- with an polished touching surface
- with zero gap (no coatings)
- for force acting at a right angle (pull-off, not shear)
- in stable room temperature
Lifting capacity in practice – influencing factors
- Air gap (between the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
- Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Material type – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- 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 was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate reduces the holding force.
Precautions when working with NdFeB magnets
This is not a toy
Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep away from children and animals.
Data carriers
Data protection: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).
Avoid contact if allergic
Some people suffer from a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Extended handling may cause skin redness. It is best to use protective gloves.
Material brittleness
Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Mechanical processing
Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.
Phone sensors
A powerful magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Do not bring magnets near a smartphone to avoid breaking the sensors.
Powerful field
Handle magnets with awareness. Their immense force can surprise even professionals. Be vigilant and do not underestimate their power.
Heat warning
Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.
Serious injuries
Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.
Implant safety
Individuals with a pacemaker should maintain an large gap from magnets. The magnetic field can stop the operation of the implant.
Tabela kosztu i czasu dostawy
Płatność przed wysyłką:
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14.99 ZŁ
InPost Paczkomaty 24/7
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12.30 ZŁ
Płatność przy odbiorze (pobranie):
GLS kurier
Przesyłka będzie u Ciebie za 1-2 dni
23.00 ZŁ
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