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SM 28x275 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130523

Diameter Ø
28 mm [±1 mm]
Height
275 mm [±1 mm]
Weight
1329.66 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

view specifications »

710.00 zł net / pcs

873.30 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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Detailed specification - SM 28x275 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 28x275 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130523
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 275 mm [±1 mm]
Weight 1329.66 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 10 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 28x275 [2xM8] / N52 - magnetic separator
properties values units
Remanence Br ? 14.2-14.7 kGs
Remanence Br ? 1420-1470 mT
Coercivity bHc ? 10.8-12.5 kOe
Coercivity bHc ? 860-995 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 48-53 BH max MGOe
Energy product BHmax ? 380-422 BH max KJ/m
Maximum working 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 28x275 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 28 mm
Total length 275 mm (L)
Active length 239 mm
Section count 10 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1287 g
Active area 210 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 (10 sections)

Simulation: 10 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Engineering data and GPSR

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
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: 130523-2026
Magnet Unit Converter

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This product serves to effectively catch ferromagnetic contaminants from bulk and liquid products. 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. The center is filled with NdFeB magnets and pole pieces, arranged to maximize the field on the tube surface. Thanks to this, the rod is durable, hygienic, and easy to keep clean.
Due to the high power of the magnet, direct removal of filings can be troublesome and time-consuming. The most effective home method is using adhesive tape, which we wrap around the dirt and peel off. For easier operation, it is worth considering ordering a rod in a version with a cleaning sleeve.
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.
Yes, as a manufacturer, we make rods of any length and diameter (standard is dia 25mm and 32mm). The rod end is strictly adapted to the fastening system in your device. Contact us for a quote on a non-standard dimension.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets effectively defend themselves against demagnetization caused by external fields,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to the potential of precise forming and customization to specialized needs, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which expands the range of possible applications,
  • Universal use in electronics industry – they serve a role in magnetic memories, electric drive systems, medical equipment, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in small systems

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in power. 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • with total lack of distance (without paint)
  • under perpendicular force vector (90-degree angle)
  • at standard ambient temperature

Key elements affecting lifting force

It is worth knowing that the magnet holding may be lower subject to the following factors, starting with the most relevant:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Steel type – low-carbon steel gives the best results. Alloy steels reduce magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Safe operation

Use magnets with awareness. Their powerful strength can shock even experienced users. Stay alert and do not underestimate their power.

Material brittleness

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. Wear goggles.

Metal Allergy

Certain individuals have a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Extended handling may cause a rash. We suggest use protective gloves.

Physical harm

Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Thermal limits

Regular neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. Damage is permanent.

Danger to the youngest

Strictly store magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are fatal.

Electronic devices

Device Safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Impact on smartphones

Remember: rare earth magnets generate a field that confuses precision electronics. Maintain a safe distance from your mobile, tablet, and GPS.

Warning for heart patients

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Fire warning

Powder produced during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Danger! Looking for details? Read our article: Are neodymium magnets dangerous?