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SM 25x350 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130355

GTIN/EAN: 5906301813033

Diameter Ø
25 mm [±1 mm]
Height
350 mm [±1 mm]
Weight
1360 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

check parameters »

860.00 zł net / pcs

1057.80 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Quantity
Net
Gross
price from 1 pcs
860.00 zł
1057.80 zł
price from 5 pcs
817.00 zł
1004.91 zł
price from 10 pcs
774.00 zł
952.02 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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Product card - SM 25x350 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 25x350 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130355
GTIN/EAN 5906301813033
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 350 mm [±1 mm]
Weight 1360 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 13 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 25x350 [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 25x350 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 350 mm (L)
Active length 314 mm
Section count 13 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1306 g
Active area 247 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) 18.1 kg (theor.)
Induction (surface) ~8 500 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (13 sections)

Simulation: 13 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical specification and ecology

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%

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: 130355-2026
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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 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 more Gauss, the smaller and more weakly magnetic particles will be effectively caught. The economical version (8kGs) handles large pieces of metal perfectly. For the food and precision industry, we recommend the highest induction parameters.
We can produce a rod of non-standard length with any mounting termination. The rod end is strictly adapted to the fastening system in your device. Contact us for a quote on a non-standard dimension.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for nearly 10 years – the loss is just ~1% (according to analyses),
  • They maintain their magnetic properties even under external field action,
  • By applying a decorative coating of nickel, the element has an proper look,
  • They are known for high magnetic induction at the operating surface, which affects their 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...
  • Possibility of detailed forming as well as adjusting to defined conditions,
  • Key role in high-tech industry – they are commonly used in data components, brushless drives, medical equipment, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions

Disadvantages

Cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

Magnet power was determined for the most favorable conditions, including:
  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • whose thickness is min. 10 mm
  • characterized by lack of roughness
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

What influences lifting capacity in practice

Effective lifting capacity is affected by working environment parameters, mainly (from most important):
  • Distance – existence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • 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 high-permeability steel. Cast iron may have worse magnetic properties.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
No play value

These products are not intended for children. Swallowing several magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates urgent medical intervention.

Safe operation

Be careful. Rare earth magnets attract from a distance and snap with huge force, often faster than you can move away.

Combustion hazard

Powder generated during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Maximum temperature

Do not overheat. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Threat to navigation

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Magnet fragility

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

Medical implants

For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Pinching danger

Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Magnetic media

Powerful magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Caution! Want to know more? Check our post: Are neodymium magnets dangerous?