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HH 25x7.7 [M5] / N38 - through hole magnetic holder
through hole magnetic holder
Catalog no 370482
GTIN/EAN: 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
9.30 ZŁ net + 23% VAT / pcs
bulk discounts:
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Lifting power as well as shape of a neodymium magnet can be verified using our
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Physical properties - 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/EAN | 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 | 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% |
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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Advantages as well as disadvantages of neodymium magnets.
Benefits
- They retain magnetic properties for around 10 years – the drop is just ~1% (according to analyses),
- They feature excellent resistance to weakening of magnetic properties due to external fields,
- Thanks to the glossy finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an professional appearance,
- The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
- Considering the ability of flexible molding and customization to unique needs, magnetic components can be created in a wide range of geometric configurations, which makes them more universal,
- Huge importance in electronics industry – they are used in mass storage devices, motor assemblies, advanced medical instruments, as well as modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in miniature devices
Limitations
- To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to 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.
- We suggest casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
- Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a base made of structural steel, perfectly concentrating the magnetic field
- possessing a massiveness of minimum 10 mm to avoid saturation
- with an ground touching surface
- under conditions of gap-free contact (metal-to-metal)
- for force acting at a right angle (pull-off, not shear)
- in neutral thermal conditions
Impact of factors on magnetic holding capacity in practice
- Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Direction of force – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be wasted to the other side.
- Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
- Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
- Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate reduces the holding force.
Safety rules for work with neodymium magnets
Precision electronics
Note: neodymium magnets produce a field that interferes with precision electronics. Maintain a separation from your mobile, tablet, and GPS.
Dust explosion hazard
Drilling and cutting of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Skin irritation risks
Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact and select coated magnets.
Handling rules
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
This is not a toy
Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Keep away from kids and pets.
Keep away from computers
Very strong magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Stay away of min. 10 cm.
Bone fractures
Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Maximum temperature
Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Medical implants
People with a heart stimulator must maintain an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.
Magnets are brittle
Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
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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