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SM 25x375 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130363

GTIN/EAN: 5906301813118

Diameter Ø

25 mm [±1 mm]

Height

375 mm [±1 mm]

Weight

1460 g

Magnetic Flux

~ 8 500 Gauss [±5%]

check parameters »

1131.60 ZŁ with VAT / pcs + price for transport

920.00 ZŁ net + 23% VAT / pcs

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Parameters as well as structure of a neodymium magnet can be calculated on our magnetic calculator.

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Detailed specification - SM 25x375 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 25x375 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130363
GTIN/EAN 5906301813118
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 375 mm [±1 mm]
Weight 1460 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 14 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 25x375 [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 25x375 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 375 mm (L)
Active length 339 mm
Section count 14 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1399 g
Active area 266 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 (14 sections)

Simulation: 14 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical and environmental data
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%
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: 130363-2026
Magnet Unit Converter
Magnet pull force
Magnetic Induction
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A magnetic rod is the basic element of building grate separators and magnetic filters. Its task is separation (separation) of metal filings from the transported material. 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. The core is a precise magnetic system generating high induction (Gauss). Such construction ensures full resistance to corrosion, water, oils, and acids.
Metal filings stick to the surface very strongly, so cleaning requires strength or cleverness. We recommend sticking packing tape to the cluster of filings and tearing it off together with the contaminants. For easier operation, it is worth considering ordering a rod in a version with a cleaning sleeve.
Magnetic induction measured in Gauss (Gs) determines the density of magnetic flux on the rod surface. The economical version (8kGs) handles large pieces of metal perfectly. High Power versions (~12000-14000 Gs) are necessary for catching metallic dust, oxides, and stainless steel after processing.
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 and weaknesses of rare earth magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to weakening of magnetic properties due to external fields,
  • In other words, due to the shiny surface of silver, the element looks attractive,
  • Neodymium magnets deliver maximum magnetic induction on a their surface, which allows for strong attraction,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of custom machining as well as optimizing to individual applications,
  • Significant place in electronics industry – they are used in computer drives, drive modules, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic mount.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these products can be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

The lifting capacity listed is a measurement result performed under the following configuration:
  • using a sheet made of mild steel, acting as a circuit closing element
  • whose thickness equals approx. 10 mm
  • with an polished contact surface
  • without any insulating layer between the magnet and steel
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

Determinants of lifting force in real conditions

During everyday use, the actual holding force is determined by several key aspects, ranked from the most important:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

Warnings
GPS Danger

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Fire warning

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Permanent damage

Keep cool. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Keep away from children

Always store magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Fragile material

Despite metallic appearance, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Handling rules

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Metal Allergy

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, avoid direct skin contact or select coated magnets.

Electronic devices

Powerful magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Life threat

People with a pacemaker have to maintain an large gap from magnets. The magnetism can stop the operation of the implant.

Physical harm

Mind your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

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