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SM 25x300 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130373

GTIN/EAN: 5906301813217

5.00

Diameter Ø

25 mm [±1 mm]

Height

300 mm [±1 mm]

Weight

1160 g

Magnetic Flux

~ 8 500 Gauss [±5%]

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910.20 ZŁ with VAT / pcs + price for transport

740.00 ZŁ net + 23% VAT / pcs

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Force along with shape of neodymium magnets can be estimated on our modular calculator.

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Technical details - SM 25x300 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 25x300 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130373
GTIN/EAN 5906301813217
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 25 mm [±1 mm]
Height 300 mm [±1 mm]
Weight 1160 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 11 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 25x300 [2xM8] / N52 - magnetic separator
properties values units
remenance Br [min. - max.] ? 14.2-14.7 kGs
remenance Br [min. - max.] ? 1420-1470 mT
coercivity bHc ? 10.8-12.5 kOe
coercivity bHc ? 860-995 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 48-53 BH max MGOe
energy density [min. - max.] ? 380-422 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°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

Table 1: Rod construction
SM 25x300 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 300 mm (L)
Active length 264 mm
Section count 11 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1119 g
Active area 207 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) 18.1 kg (theor.)
Induction (surface) ~8 500 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (11 sections)

Simulation: 11 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical and environmental data
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
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 130373-2026
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It is the "heart" of every magnetic filter used in industry for cleaning raw materials. It is commonly used for cleaning flour, sugar, plastic granules, as well as oils and coolants. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.
The construction relies on a sealed, welded stainless steel housing, polished smooth. Inside there is a stack of strong neodymium magnets arranged in a special configuration (magnetic circuit). Such construction ensures full resistance to corrosion, water, oils, and acids.
Due to the high power of the magnet, direct removal of filings can be troublesome and time-consuming. You can use compressed air or special non-magnetic strippers (rings). In industry, cover tubes (so-called Easy Clean system) are used, from which the magnetic insert slides out.
The Gauss value tells us how effectively and deeply the magnet will catch contaminants. For basic machine protection against pieces of iron, standard power is sufficient. For the food and precision industry, we recommend the highest induction parameters.
We fulfill individual orders for bars perfectly matched to your machine or separator. We offer various tip options: threaded holes (e.g., M8, M10), protruding screws, flat pivots, mills, or handles. Contact us for a quote on a non-standard dimension.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They retain magnetic properties for around 10 years – the drop is just ~1% (based on simulations),
  • They feature excellent resistance to magnetic field loss when exposed to external fields,
  • By using a shiny coating of gold, the element presents an nice look,
  • Magnetic induction on the surface of the magnet remains maximum,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in forming and the capacity to modify to client solutions,
  • Fundamental importance in modern industrial fields – they serve a role in magnetic memories, motor assemblies, medical devices, also other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complicated forms in magnets, we propose using a housing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these products can complicate diagnosis medical when they are in the body.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 0.00 kg is a theoretical maximum value conducted under specific, ideal conditions:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • with a cross-section of at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Real force is influenced by working environment parameters, mainly (from priority):
  • Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
  • Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Respect the power

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Implant safety

Individuals with a pacemaker should maintain an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.

Swallowing risk

These products are not suitable for play. Eating several magnets may result in them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.

Electronic devices

Equipment safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Threat to navigation

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Protective goggles

NdFeB magnets are sintered ceramics, which means they are very brittle. Impact of two magnets leads to them shattering into small pieces.

Fire warning

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Crushing force

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Maximum temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or select coated magnets.

Caution! More info about risks in the article: Safety of working with magnets.