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SM 28x375 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130516

Diameter Ø
28 mm [±1 mm]
Height
375 mm [±1 mm]
Weight
1831.42 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

product parameters »

950.00 zł net / pcs

1168.50 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 28x375 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 28x375 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130516
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 375 mm [±1 mm]
Weight 1831.42 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 28x375 [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 28x375 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 28 mm
Total length 375 mm (L)
Active length 339 mm
Section count 14 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1755 g
Active area 298 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 (14 sections)

Simulation: 14 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical specification and ecology

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%

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: 130516-2026
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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. High magnetic induction on the surface allows catching the finest iron particles.
The rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). 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.
Metal contaminants are strongly attracted, so removing them with a bare hand or glove can be difficult. The most effective home method is using adhesive tape, which we wrap around the dirt and peel off. In industry, cover tubes (so-called Easy Clean system) are used, from which the magnetic insert slides out.
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.
Yes, as a manufacturer, we make rods of any length and diameter (standard is dia 25mm and 32mm). 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.

Advantages and disadvantages of rare earth magnets.

Benefits

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They do not lose power, even after around 10 years – the decrease in lifting capacity is only ~1% (according to tests),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of individual forming as well as modifying to precise applications,
  • Key role in modern technologies – they serve a role in mass storage devices, motor assemblies, medical equipment, as well as multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 prevent oxidation and corrosion.
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

The lifting capacity listed is a theoretical maximum value performed under standard conditions:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with a surface perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • under perpendicular force vector (90-degree angle)
  • at temperature room level

Practical aspects of lifting capacity – factors

It is worth knowing that the working load may be lower depending on the following factors, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, rust or debris).
  • Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate does not close the flux, causing part of the power to be wasted to the other side.
  • Material composition – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. 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, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Combustion hazard

Powder generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

GPS and phone interference

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Powerful field

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

Sensitization to coating

Certain individuals have a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Prolonged contact might lead to a rash. We strongly advise use safety gloves.

Bodily injuries

Danger of trauma: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Data carriers

Do not bring magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

No play value

These products are not intended for children. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Heat sensitivity

Keep cool. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Eye protection

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?