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HH 20x7.2 [M4] / N38 - through hole magnetic holder
through hole magnetic holder
Catalog no 370481
GTIN/EAN: 5906301814917
Diameter Ø
20 mm [±1 mm]
Height
7.2 mm [±1 mm]
Weight
13.2 g
Magnetization Direction
↑ axial
Load capacity
8.00 kg / 78.45 N
Coating
[NiCuNi] Nickel
6.40 ZŁ with VAT / pcs + price for transport
5.20 ZŁ net + 23% VAT / pcs
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Physical properties - HH 20x7.2 [M4] / N38 - through hole magnetic holder
Specification / characteristics - HH 20x7.2 [M4] / N38 - through hole magnetic holder
| properties | values |
|---|---|
| Cat. no. | 370481 |
| GTIN/EAN | 5906301814917 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±1 mm] |
| Height | 7.2 mm [±1 mm] |
| Weight | 13.2 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 8.00 kg / 78.45 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 |
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also proposals
![SM 25x150 [2xM8] / N42 - magnetic separator](https://cdn3.dhit.pl/graphics/products/sm-25x150-2xm8-cim.jpg "SM 25x150 [2xM8] / N42 - magnetic separator")
![UMGW 16x13x5 [M4] GW / N38 - magnetic holder internal thread](https://cdn3.dhit.pl/graphics/products/um-16x13x5-m4-gw-fig.jpg "UMGW 16x13x5 [M4] GW / N38 - magnetic holder internal thread")
Advantages and disadvantages of Nd2Fe14B magnets.
Advantages
- They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
- Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
- Thanks to the elegant finish, the layer of nickel, gold, or silver-plated gives an visually attractive appearance,
- The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
- 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...
- Thanks to flexibility in constructing and the capacity to customize to complex applications,
- Wide application in modern industrial fields – they find application in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in small systems
Limitations
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only protects 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 strength (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 usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
- Limited possibility of creating threads in the magnet and complicated shapes - recommended is a housing - mounting mechanism.
- Possible danger related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is economically unviable,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what affects it?
- with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
- whose thickness reaches at least 10 mm
- with an ideally smooth touching surface
- under conditions of ideal adhesion (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- at room temperature
Lifting capacity in practice – influencing factors
- Distance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Direction of force – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
- Base massiveness – too thin sheet does not close the flux, causing part of the power to be escaped to the other side.
- Plate material – mild steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the holding force.
Safe handling of NdFeB magnets
Physical harm
Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!
Avoid contact if allergic
Some people suffer from a sensitization to Ni, which is the common plating for NdFeB magnets. Prolonged contact can result in dermatitis. It is best to wear protective gloves.
Mechanical processing
Dust generated during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Do not underestimate power
Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
Electronic hazard
Do not bring magnets near a wallet, computer, or screen. The magnetism can destroy these devices and erase data from cards.
Life threat
Warning for patients: Powerful magnets disrupt medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.
Eye protection
Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.
Operating temperature
Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.
Phone sensors
Be aware: rare earth magnets produce a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and navigation systems.
Product not for children
NdFeB magnets are not toys. Swallowing several magnets may result in them attracting across intestines, which poses a critical condition and requires urgent medical intervention.
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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