UMC 42x7/4x9 / N38 - cylindrical magnetic holder
cylindrical magnetic holder
Catalog no 320411
GTIN/EAN: 5906301814672
Diameter
42 mm [±1 mm]
internal diameter Ø
7/4 mm [±1 mm]
Height
9 mm [±1 mm]
Weight
72 g
Load capacity
32.00 kg / 313.81 N
Coating
[NiCuNi] Nickel
29.99 ZŁ with VAT / pcs + price for transport
24.38 ZŁ net + 23% VAT / pcs
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Parameters as well as appearance of a neodymium magnet can be estimated using our
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Product card - UMC 42x7/4x9 / N38 - cylindrical magnetic holder
Specification / characteristics - UMC 42x7/4x9 / N38 - cylindrical magnetic holder
| properties | values |
|---|---|
| Cat. no. | 320411 |
| GTIN/EAN | 5906301814672 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 42 mm [±1 mm] |
| internal diameter Ø | 7/4 mm [±1 mm] |
| Height | 9 mm [±1 mm] |
| Weight | 72 g |
| Load capacity ~ ? | 32.00 kg / 313.81 N |
| 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 |
Chemical composition
| 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.
Pros
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
- They do not lose their magnetic properties even under close interference source,
- The use of an refined coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
- 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...
- Possibility of accurate machining and optimizing to defined needs,
- Fundamental importance in high-tech industry – they find application in mass storage devices, drive modules, medical equipment, and industrial machines.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
- 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 and 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We recommend a housing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
- Health risk to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum holding power of the magnet – what affects it?
- with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
- with a cross-section minimum 10 mm
- with a plane perfectly flat
- with total lack of distance (no coatings)
- for force acting at a right angle (in the magnet axis)
- at temperature approx. 20 degrees Celsius
Determinants of lifting force in real conditions
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
- Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped to the other side.
- Chemical composition of the base – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
- Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Temperature – heating the magnet results in weakening of induction. It is worth remembering 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, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate reduces the load capacity.
Safety rules for work with neodymium magnets
No play value
Neodymium magnets are not suitable for play. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and requires immediate surgery.
Handling rules
Exercise caution. Rare earth magnets act from a long distance and connect with massive power, often faster than you can react.
Magnets are brittle
Neodymium magnets are sintered ceramics, which means they are fragile like glass. Clashing of two magnets will cause them shattering into small pieces.
Finger safety
Big blocks can break fingers instantly. Never place your hand between two attracting surfaces.
Compass and GPS
An intense magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Maintain magnets close to a smartphone to prevent damaging the sensors.
Protect data
Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.
Allergic reactions
Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, avoid direct skin contact or choose coated magnets.
Medical interference
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 warning
Machining of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Heat warning
Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
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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