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SM 25x150 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130368

GTIN/EAN: 5906301813163

5.00
Diameter Ø
25 mm [±1 mm]
Height
150 mm [±1 mm]
Weight
560 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

technical parameters »

400.00 zł net / pcs

492.00 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 of the product - SM 25x150 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 25x150 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130368
GTIN/EAN 5906301813163
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 150 mm [±1 mm]
Weight 560 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 5 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 25x150 [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 25x150 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 150 mm (L)
Active length 114 mm
Section count 4 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~560 g
Active area 90 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 (4 sections)

Simulation: 4 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%

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: 130368-2026
Measurement Calculator

Force (pull)

Magnetic Induction

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It is the "heart" of every magnetic filter used in industry for cleaning raw materials. It is commonly used for cleaning flour, sugar, plastic granules, as well as oils and coolants. 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 more Gauss, the smaller and more weakly magnetic particles will be effectively caught. 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 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 neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • A magnet with a shiny nickel surface is more attractive,
  • Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of exact forming and modifying to specific needs,
  • Fundamental importance in high-tech industry – they are commonly used in HDD drives, motor assemblies, precision medical tools, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Limited possibility of creating nuts in the magnet and complex forms - preferred is cover - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

Magnet power was determined for optimal configuration, taking into account:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • with a thickness minimum 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Holding efficiency impacted by specific conditions, such as (from most important):
  • Gap (betwixt the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Load vector – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Warnings
Shattering risk

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

Do not drill into magnets

Powder generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Conscious usage

Handle magnets with awareness. Their immense force can shock even professionals. Stay alert and respect their power.

Keep away from computers

Do not bring magnets near a purse, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Threat to navigation

Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Medical implants

For implant holders: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Hand protection

Danger of trauma: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Thermal limits

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

This is not a toy

Neodymium magnets are not intended for children. Accidental ingestion of a few magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Nickel coating and allergies

Studies show that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or choose encased magnets.

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