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SM 28x225 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130514

Diameter Ø
28 mm [±1 mm]
Height
225 mm [±1 mm]
Weight
1078.78 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

product specifications »

590.00 zł net / pcs

725.70 zł with VAT (23% VAT) / pcs

price for transport

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Frequently asked questions

Which rod should I choose for fine contamination?
For particles below 0.5 mm — a Ø32 mm rod in grade N52, with surface induction of about 10,000 Gs. A Ø25 rod in grade N42 gives about 6,500 Gs and is chosen for contamination above 1 mm: bolts, washers, pieces of wire.
Which rod pitch should I choose?
The narrow pitch, 40 mm centre to centre, for fine free-flowing fractions — it gives denser coverage of the cross-section. The wide pitch, 50 mm, for granulates and for damp, greasy or sticky materials, where a narrow pitch risks the material bridging above the rods.
Why does efficiency drop after a few weeks of operation?
Almost always because the separator has not been cleaned. The layer of captured particles shields the field, and further particles settle on that layer rather than on the rod surface, where the gradient is far stronger. The magnets themselves do not weaken at that rate.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical of the product - SM 28x225 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 28x225 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130514
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 28 mm [±1 mm]
Height 225 mm [±1 mm]
Weight 1078.78 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 8 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 28x225 [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 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 28x225 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 28 mm
Total length 225 mm (L)
Active length 189 mm
Section count 8 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1053 g
Active area 166 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) 22.7 kg (theor.)
Induction (surface) ~8 500 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (8 sections)

Simulation: 8 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical specification and ecology

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%

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: 130514-2026
Measurement Calculator

Magnet pull force

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It is the "heart" of every magnetic filter used in industry for cleaning raw materials. It is mounted in chutes, hoppers, and pipelines to protect production machines from failure. High magnetic induction on the surface allows catching the finest iron particles.
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. You can use compressed air or special non-magnetic strippers (rings). 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. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. High induction is necessary when contaminants are microscopic or weakly magnetic.
Yes, as a manufacturer, we make rods of any length and diameter (standard is dia 25mm and 32mm). You can choose a mounting method consistent with your technical design. Contact us for a quote on a non-standard dimension.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even after approximately 10 years – the decrease in strength is only ~1% (theoretically),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the elegant finish, the coating of nickel, gold-plated, or silver-plated gives an visually attractive appearance,
  • Magnetic induction on the working part of the magnet remains extremely intense,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Thanks to flexibility in designing and the ability to customize to unusual requirements,
  • Key role in electronics industry – they are utilized in computer drives, electric motors, medical devices, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons

Cons of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of making threads in the magnet and complicated shapes - recommended is a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what it depends on?

The lifting capacity listed is a measurement result performed under the following configuration:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • with zero gap (without coatings)
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by specific conditions, including (from most important):
  • Distance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Sensitization to coating

A percentage of the population suffer from a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Prolonged contact may cause a rash. We recommend use safety gloves.

Pinching danger

Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Handling rules

Handle with care. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can react.

Dust is flammable

Powder produced during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Safe distance

Intense magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Shattering risk

NdFeB magnets are ceramic materials, which means they are very brittle. Clashing of two magnets will cause them cracking into shards.

Product not for children

Only for adults. Small elements pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.

Heat sensitivity

Watch the temperature. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.

ICD Warning

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Magnetic interference

Be aware: neodymium magnets generate a field that interferes with precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Danger! Want to know more? Check our post: Why are neodymium magnets dangerous?