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SM 25x400 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130365

GTIN/EAN: 5906301813392

Diameter Ø
25 mm [±1 mm]
Height
400 mm [±1 mm]
Weight
1560 g
Magnetic Flux
~ 6 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

view specifications »

920.00 zł net / pcs

1131.60 zł with VAT (23% VAT) / pcs

price for transport

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Quantity
Net
Gross
price from 1 pcs
920.00 zł
1131.60 zł
price from 5 pcs
828.00 zł
1018.44 zł

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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Physical properties - SM 25x400 [2xM8] / N42 - magnetic separator

Specification / characteristics - SM 25x400 [2xM8] / N42 - magnetic separator

properties
properties values
Cat. no. 130365
GTIN/EAN 5906301813392
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 400 mm [±1 mm]
Weight 1560 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 6 500 Gauss [±5%]
Size/Mount Quantity 2xM8
Polarity circumferential - 15 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 25x400 [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 25x400 [2xM8] / N42

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 400 mm (L)
Active length 364 mm
Section count 15 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1492 g
Active area 286 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 (15 sections)

Simulation: 15 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%

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: 130365-2026
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This product serves to effectively catch ferromagnetic contaminants from bulk and liquid products. 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 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). Thanks to this, the rod is durable, hygienic, and easy to keep clean.
Metal filings stick to the surface very strongly, so cleaning requires strength or cleverness. 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. The economical version (8kGs) handles large pieces of metal perfectly. High induction is necessary when contaminants are microscopic or weakly magnetic.
We can produce a rod of non-standard length with any mounting termination. 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 as well as disadvantages of rare earth magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • Their power is durable, and after approximately ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under close interference source,
  • In other words, due to the shiny finish of silver, the element looks attractive,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • 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...
  • Due to the option of precise molding and adaptation to unique projects, magnetic components can be modeled in a wide range of forms and dimensions, which amplifies use scope,
  • Versatile presence in advanced technology sectors – they are utilized in data components, electric motors, medical equipment, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • 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
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

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

The declared magnet strength represents the peak performance, measured under laboratory conditions, specifically:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • whose thickness equals approx. 10 mm
  • with a surface cleaned and smooth
  • with zero gap (no impurities)
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

Please note that the working load will differ depending on the following factors, in order of importance:
  • Gap (betwixt the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Immense force

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Bodily injuries

Large magnets can break fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Health Danger

Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or request help to work with the magnets.

Permanent damage

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. This process is irreversible.

Dust is flammable

Machining of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Keep away from children

Absolutely store magnets out of reach of children. Choking hazard is high, and the effects of magnets connecting inside the body are tragic.

Keep away from computers

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, timepieces).

Skin irritation risks

Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, avoid direct skin contact and select coated magnets.

Protective goggles

Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Precision electronics

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Warning! Learn more about hazards in the article: Safety of working with magnets.