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SM 32x250 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130362

GTIN/EAN: 5906301813101

Diameter Ø
32 mm [±1 mm]
Height
250 mm [±1 mm]
Weight
1285 g
Magnetic Flux
~ 10 000 Gauss [±5%]

How we measure these parameters — certificates and measurements

see properties »

770.00 zł net / pcs

947.10 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 details - SM 32x250 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 32x250 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130362
GTIN/EAN 5906301813101
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 32 mm [±1 mm]
Height 250 mm [±1 mm]
Weight 1285 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 10 000 Gauss [±5%]
Size/Mount Quantity 2xM8
Polarity circumferential - 9 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 32x250 [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 32x250 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 32 mm
Total length 250 mm (L)
Active length 214 mm
Section count 9 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1528 g
Active area 215 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) 41 kg (theor.)
Induction (surface) ~10 000 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (9 sections)

Simulation: 9 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Engineering data and GPSR

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%

Environmental data

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: 130362-2026
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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. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.
The outer layer is hygienic acid-resistant steel, approved for food contact. Inside there is a stack of strong neodymium magnets arranged in a special configuration (magnetic circuit). 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. 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.
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.
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 neodymium magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after approximately 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
  • They have excellent resistance to weakening of magnetic properties due to external fields,
  • By applying a reflective layer of silver, the element presents an proper look,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in designing and the capacity to adapt to specific needs,
  • Huge importance in innovative solutions – they are commonly used in computer drives, drive modules, advanced medical instruments, and modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of making nuts in the magnet and complicated forms - preferred is casing - mounting mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these devices are able to complicate diagnosis medical when they are in the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Pull force analysis

Detachment force of the magnet in optimal conditions – what affects it?

Holding force of 0.00 kg is a theoretical maximum value conducted under specific, ideal conditions:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • with direct contact (without coatings)
  • under perpendicular application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

Real force is influenced by working environment parameters, such as (from most important):
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin steel does not close the flux, causing part of the flux to be lost into the air.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may attract less.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Serious injuries

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

Mechanical processing

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Avoid contact if allergic

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop handling magnets and use protective gear.

Conscious usage

Use magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their power.

This is not a toy

Only for adults. Tiny parts pose a choking risk, causing severe trauma. Store away from kids and pets.

GPS and phone interference

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can ruin the sensors in your phone.

Magnetic media

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

Power loss in heat

Control the heat. Exposing the magnet to high heat will ruin its magnetic structure and strength.

Life threat

People with a pacemaker must keep an absolute distance from magnets. The magnetic field can interfere with the operation of the implant.

Fragile material

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Caution! More info about risks in the article: Magnet Safety Guide.