HH 25x7.7 [M5] / N38 - through hole magnetic holder
through hole magnetic holder
Catalog no 370482
GTIN: 5906301814924
Diameter Ø
25 mm [±1 mm]
Height
7.7 mm [±1 mm]
Weight
23.8 g
Magnetization Direction
↑ axial
Load capacity
17.00 kg / 166.71 N
Coating
[NiCuNi] Nickel
11.44 ZŁ with VAT / pcs + price for transport
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HH 25x7.7 [M5] / N38 - through hole magnetic holder
Specification / characteristics HH 25x7.7 [M5] / N38 - through hole magnetic holder
| properties | values |
|---|---|
| Cat. no. | 370482 |
| GTIN | 5906301814924 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 25 mm [±1 mm] |
| Height | 7.7 mm [±1 mm] |
| Weight | 23.8 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 17.00 kg / 166.71 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 proposals
Advantages as well as disadvantages of rare earth magnets.
In addition to their pulling strength, neodymium magnets provide the following advantages:
- They retain full power for around 10 years – the loss is just ~1% (according to analyses),
- They have excellent resistance to weakening of magnetic properties due to external fields,
- Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
- The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of accurate creating and optimizing to concrete requirements,
- Universal use in future technologies – they are used in data components, electromotive mechanisms, medical devices, and complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices
Disadvantages of neodymium magnets:
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects 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 advise 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, when using outdoors
- We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices are able to be problematic in diagnostics medical when they are in the body.
- With budget limitations the cost of neodymium magnets is a challenge,
Highest magnetic holding force – what it depends on?
Holding force of 17.00 kg is a result of laboratory testing performed under the following configuration:
- with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a thickness of at least 10 mm
- with a surface cleaned and smooth
- without the slightest clearance between the magnet and steel
- under perpendicular force vector (90-degree angle)
- at conditions approx. 20°C
Determinants of lifting force in real conditions
During everyday use, the actual lifting capacity results from a number of factors, presented from the most important:
- Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Direction of force – highest force is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
- Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
- Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
- Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.
* Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate lowers the load capacity.
Advantages as well as disadvantages of rare earth magnets.
In addition to their pulling strength, neodymium magnets provide the following advantages:
- They retain full power for around 10 years – the loss is just ~1% (according to analyses),
- They have excellent resistance to weakening of magnetic properties due to external fields,
- Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
- The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of accurate creating and optimizing to concrete requirements,
- Universal use in future technologies – they are used in data components, electromotive mechanisms, medical devices, and complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices
Disadvantages of neodymium magnets:
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects 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 advise 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, when using outdoors
- We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices are able to be problematic in diagnostics medical when they are in the body.
- With budget limitations the cost of neodymium magnets is a challenge,
Highest magnetic holding force – what it depends on?
Holding force of 17.00 kg is a result of laboratory testing performed under the following configuration:
- with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a thickness of at least 10 mm
- with a surface cleaned and smooth
- without the slightest clearance between the magnet and steel
- under perpendicular force vector (90-degree angle)
- at conditions approx. 20°C
Determinants of lifting force in real conditions
During everyday use, the actual lifting capacity results from a number of factors, presented from the most important:
- Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Direction of force – highest force is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
- Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
- Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
- Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.
* Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate lowers the load capacity.
H&S for magnets
Demagnetization risk
Keep cool. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).
Serious injuries
Danger of trauma: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Combustion hazard
Powder created during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Electronic devices
Avoid bringing magnets close to a wallet, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Respect the power
Handle magnets consciously. Their huge power can shock even experienced users. Plan your moves and respect their power.
Swallowing risk
Always store magnets away from children. Choking hazard is significant, and the effects of magnets connecting inside the body are tragic.
Nickel coating and allergies
Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, avoid direct skin contact or select versions in plastic housing.
Protective goggles
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.
Keep away from electronics
A powerful magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Keep magnets near a device to avoid damaging the sensors.
Warning for heart patients
Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.
Warning!
Details about hazards in the article: Magnet Safety Guide.
