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SM 25x175 [2xM8] / N42 - magnetic separator
magnetic separator
Catalog no 130290
GTIN/EAN: 5906301812838
- Diameter Ø
- 25 mm [±1 mm]
- Height
- 175 mm [±1 mm]
- Weight
- 660 g
- Magnetic Flux
- ~ 6 500 Gauss [±5%]
410.00 zł net / pcs
504.30 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
Which rod should I choose for fine contamination?
Which rod pitch should I choose?
Why does efficiency drop after a few weeks of operation?
Guides from the knowledge base
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Specifications and structure of a neodymium magnet can be estimated using our
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Technical details - SM 25x175 [2xM8] / N42 - magnetic separator
Specification / characteristics - SM 25x175 [2xM8] / N42 - magnetic separator
| properties | values |
|---|---|
| Cat. no. | 130290 |
| GTIN/EAN | 5906301812838 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 25 mm [±1 mm] |
| Height | 175 mm [±1 mm] |
| Weight | 660 g |
| Material Type | Stainless steel AISI 304 / A2 |
| Magnetic Flux | ~ 6 500 Gauss [±5%] |
| Size/Mount Quantity | 2xM8 |
| Polarity | circumferential - 6 poles |
| Casing Tube Thickness | 1 mm |
| Manufacturing Tolerance | ±1 mm |
Magnetic properties of material N42
| properties | values | units |
|---|---|---|
| remenance Br [min. - max.] ? | 12.9-13.2 | kGs |
| remenance Br [min. - max.] ? | 1290-1320 | mT |
| coercivity bHc ? | 10.8-12.0 | kOe |
| coercivity bHc ? | 860-955 | kA/m |
| actual internal force iHc | ≥ 12 | kOe |
| actual internal force iHc | ≥ 955 | kA/m |
| energy density [min. - max.] ? | 40-42 | BH max MGOe |
| energy density [min. - max.] ? | 318-334 | 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 |
Table 1: Rod construction
SM 25x175 [2xM8] / N42
| Parameter | Value | Description / Unit |
|---|---|---|
| Diameter (Ø) | 25 | mm |
| Total length | 175 | mm (L) |
| Active length | 139 | mm |
| Section count | 6 | modules |
| Dead zone | 36 | mm (2x 18mm starter) |
| Weight (est.) | ~653 | g |
| Active area | 109 | cm² (Area) |
| Housing material | AISI 304 | 1.4301 (Inox) |
| Surface finish | Ra < 0.8 µm | Polished |
| Temp. class | 80°C | Standard (N) |
| Force loss (at max °C) | -12.8% | Reversible loss (physics) |
| Force (calculated) | 10.6 | kg (theor.) |
| Induction (surface) | ~6 500 | Gauss (Max) |
Chart 2: Field profile (6 sections)
Chart 3: Temperature performance
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths and weaknesses of rare earth magnets.
Strengths
- They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
- They possess excellent resistance to magnetic field loss due to opposing magnetic fields,
- The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnetic induction on the top side of the magnet remains very high,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Considering the ability of accurate molding and adaptation to individualized requirements, NdFeB magnets can be created in a wide range of shapes and sizes, which expands the range of possible applications,
- Fundamental importance in modern technologies – they serve a role in data components, motor assemblies, diagnostic systems, as well as technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Weaknesses
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated shapes.
- Possible danger to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these magnets can disrupt the diagnostic process medical when they are in the body.
- With mass production the cost of neodymium magnets can be a barrier,
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- with the application of a yoke made of special test steel, guaranteeing maximum field concentration
- with a cross-section of at least 10 mm
- with a plane perfectly flat
- without the slightest clearance between the magnet and steel
- under axial application of breakaway force (90-degree angle)
- at standard ambient temperature
Impact of factors on magnetic holding capacity in practice
- Gap (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or debris).
- Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
- Steel thickness – too thin sheet does not accept the full field, causing part of the power to be escaped into the air.
- Steel grade – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
- Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.
Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Heat sensitivity
Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).
Do not underestimate power
Handle with care. Rare earth magnets attract from a long distance and snap with massive power, often quicker than you can react.
Do not drill into magnets
Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.
Keep away from computers
Equipment safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).
Impact on smartphones
GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
Metal Allergy
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease working with magnets and use protective gear.
Product not for children
Product intended for adults. Small elements pose a choking risk, causing severe trauma. Store out of reach of kids and pets.
Bodily injuries
Big blocks can break fingers instantly. Do not place your hand betwixt two strong magnets.
Magnets are brittle
Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Life threat
Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
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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