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SM 25x200 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130291

GTIN/EAN: 5906301812845

Diameter Ø
25 mm [±1 mm]
Height
200 mm [±1 mm]
Weight
760 g
Magnetic Flux
~ 6 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

technical specifications »

440.00 zł net / pcs

541.20 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 25x200 [2xM8] / N42 - magnetic separator

Specification / characteristics - SM 25x200 [2xM8] / N42 - magnetic separator

properties
properties values
Cat. no. 130291
GTIN/EAN 5906301812845
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 200 mm [±1 mm]
Weight 760 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 6 500 Gauss [±5%]
Size/Mount Quantity 2xM8
Polarity circumferential - 7 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 25x200 [2xM8] / N42 - magnetic separator
properties values units
Remanence Br ? 12.9-13.2 kGs
Remanence Br ? 1290-1320 mT
Coercivity bHc ? 10.8-12.0 kOe
Coercivity bHc ? 860-955 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 40-42 BH max MGOe
Energy product BHmax ? 318-334 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 25x200 [2xM8] / N42

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 200 mm (L)
Active length 164 mm
Section count 7 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~746 g
Active area 129 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) 10.6 kg (theor.)
Induction (surface) ~6 500 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (7 sections)

Simulation: 7 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical and environmental data

Elemental analysis

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: 130291-2026
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This product serves to effectively catch ferromagnetic contaminants from bulk and liquid products. 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. 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.
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.
The Gauss value tells us how effectively and deeply the magnet will catch contaminants. 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. The rod end is strictly adapted to the fastening system in your device. Contact us for a quote on a non-standard dimension.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They do not lose power, even after nearly ten years – the drop in power is only ~1% (theoretically),
  • They do not lose their magnetic properties even under close interference source,
  • In other words, due to the shiny finish of gold, the element becomes visually attractive,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • In view of the potential of free forming and adaptation to unique solutions, magnetic components can be produced in a broad palette of shapes and sizes, which increases their versatility,
  • Huge importance in electronics industry – they are utilized in HDD drives, motor assemblies, medical devices, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • 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 creating threads and complex shapes in magnets, we propose using casing - magnetic mount.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The lifting capacity listed is a measurement result executed under the following configuration:
  • on a plate made of mild steel, effectively closing the magnetic field
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • with zero gap (without paint)
  • under vertical force direction (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Effective lifting capacity is affected by working environment parameters, mainly (from priority):
  • Distance (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Stainless steels may attract less.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.

Safety rules for work with neodymium magnets
GPS Danger

Navigation devices and smartphones are highly susceptible to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Mechanical processing

Fire warning: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Beware of splinters

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

Swallowing risk

These products are not intended for children. Swallowing a few magnets can lead to them attracting across intestines, which constitutes a direct threat to life and requires urgent medical intervention.

Threat to electronics

Avoid bringing magnets near a purse, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Respect the power

Handle with care. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can move away.

Health Danger

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Power loss in heat

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

Metal Allergy

Certain individuals experience a contact allergy to nickel, which is the common plating for neodymium magnets. Extended handling may cause skin redness. We strongly advise use safety gloves.

Physical harm

Risk of injury: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Warning! More info about hazards in the article: Magnet Safety Guide.