UMH 20x7x35 [M4] / N38 - magnetic holder with hook
magnetic holder with hook
Catalog no 310425
GTIN: 5906301814542
Diameter Ø
20 mm [±1 mm]
Height
35 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
21 g
Magnetization Direction
↑ axial
Load capacity
14.50 kg / 142.20 N
Coating
[NiCuNi] Nickel
8.59 ZŁ with VAT / pcs + price for transport
6.98 ZŁ net + 23% VAT / pcs
bulk discounts:
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UMH 20x7x35 [M4] / N38 - magnetic holder with hook
Specification / characteristics UMH 20x7x35 [M4] / N38 - magnetic holder with hook
| properties | values |
|---|---|
| Cat. no. | 310425 |
| GTIN | 5906301814542 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±1 mm] |
| Height | 35 mm [±1 mm] |
| Height | 7 mm [±1 mm] |
| Weight | 21 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 14.50 kg / 142.20 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 | T |
| 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 106 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Jak rozdzielać?
Nie próbuj odrywać magnesów siłą!
Zawsze zsuwaj je na bok krawędzi stołu.
Elektronika
Trzymaj z dala od dysków HDD, kart płatniczych i telefonów.
Rozruszniki Serca
Osoby z rozrusznikiem muszą zachować dystans min. 10 cm.
Nie dla dzieci
Ryzyko połknięcia. Połknięcie dwóch magnesów grozi śmiercią.
Kruchy materiał
Magnes to ceramika! Uderzenie o inny magnes spowoduje odpryski.
Do czego użyć tego magnesu?
Sprawdzone zastosowania dla wymiaru 15x10x2 mm
Elektronika i Czujniki
Idealny jako element wyzwalający dla czujników Halla oraz kontaktronów w systemach alarmowych. Płaski kształt (2mm) pozwala na ukrycie go w wąskich szczelinach obudowy.
Modelarstwo i Druk 3D
Stosowany do tworzenia niewidocznych zamknięć w modelach drukowanych 3D. Można go wprasować w wydruk lub wkleić w kieszeń zaprojektowaną w modelu CAD.
Meble i Fronty
Używany jako "domykacz" lekkich drzwiczek szafkowych, gdzie standardowe magnesy meblowe są za grube. Wymaga wklejenia w płytkie podfrezowanie.
Other products
Pros as well as cons of NdFeB magnets.
Besides their high retention, neodymium magnets are valued for these benefits:
- Their strength is maintained, and after around 10 years it drops only by ~1% (according to research),
- Magnets very well defend themselves against demagnetization caused by foreign field sources,
- Thanks to the elegant finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
- Magnets are characterized by very high magnetic induction on the active area,
- 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 freedom in designing and the capacity to customize to individual projects,
- Wide application in advanced technology sectors – they are commonly used in hard drives, motor assemblies, medical devices, and complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Cons of neodymium magnets: application proposals
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- 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
- Limited possibility of making nuts in the magnet and complicated shapes - preferred is casing - mounting mechanism.
- Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these devices can 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
Maximum lifting capacity of the magnet – what contributes to it?
The load parameter shown refers to the limit force, measured under laboratory conditions, meaning:
- with the use of a yoke made of special test steel, ensuring maximum field concentration
- possessing a massiveness of minimum 10 mm to avoid saturation
- with an ideally smooth touching surface
- without the slightest insulating layer between the magnet and steel
- during pulling in a direction perpendicular to the plane
- at ambient temperature room level
Practical lifting capacity: influencing factors
In practice, the actual lifting capacity depends on many variables, listed from crucial:
- Clearance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
- Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
- Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.
* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.
Pros as well as cons of NdFeB magnets.
Besides their high retention, neodymium magnets are valued for these benefits:
- Their strength is maintained, and after around 10 years it drops only by ~1% (according to research),
- Magnets very well defend themselves against demagnetization caused by foreign field sources,
- Thanks to the elegant finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
- Magnets are characterized by very high magnetic induction on the active area,
- 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 freedom in designing and the capacity to customize to individual projects,
- Wide application in advanced technology sectors – they are commonly used in hard drives, motor assemblies, medical devices, and complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Cons of neodymium magnets: application proposals
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- 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
- Limited possibility of making nuts in the magnet and complicated shapes - preferred is casing - mounting mechanism.
- Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these devices can 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
Maximum lifting capacity of the magnet – what contributes to it?
The load parameter shown refers to the limit force, measured under laboratory conditions, meaning:
- with the use of a yoke made of special test steel, ensuring maximum field concentration
- possessing a massiveness of minimum 10 mm to avoid saturation
- with an ideally smooth touching surface
- without the slightest insulating layer between the magnet and steel
- during pulling in a direction perpendicular to the plane
- at ambient temperature room level
Practical lifting capacity: influencing factors
In practice, the actual lifting capacity depends on many variables, listed from crucial:
- Clearance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
- Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
- Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.
* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.
Warnings
No play value
Neodymium magnets are not intended for children. Accidental ingestion of several magnets may result in them attracting across intestines, which poses a severe health hazard and requires immediate surgery.
Handling guide
Handle magnets with awareness. Their immense force can shock even experienced users. Be vigilant and respect their force.
Magnetic media
Very strong magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
Sensitization to coating
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.
Heat sensitivity
Do not overheat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).
Flammability
Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.
Keep away from electronics
Remember: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a safe distance from your mobile, tablet, and navigation systems.
Crushing force
Large magnets can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.
Protective goggles
NdFeB magnets are sintered ceramics, meaning they are very brittle. Clashing of two magnets leads to them shattering into shards.
Pacemakers
Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.
Caution!
Learn more about risks in the article: Magnet Safety Guide.
