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SM 25x325 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130370

GTIN/EAN: 5906301813187

Diameter Ø
25 mm [±1 mm]
Height
325 mm [±1 mm]
Weight
1260 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

view technical specifications »

890.00 zł net / pcs

1094.70 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 specification - SM 25x325 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 25x325 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130370
GTIN/EAN 5906301813187
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 325 mm [±1 mm]
Weight 1260 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 12 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 25x325 [2xM8] / N52 - magnetic separator
properties values units
Remanence Br ? 14.2-14.7 kGs
Remanence Br ? 1420-1470 mT
Coercivity bHc ? 10.8-12.5 kOe
Coercivity bHc ? 860-995 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 48-53 BH max MGOe
Energy product BHmax ? 380-422 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 25x325 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 325 mm (L)
Active length 289 mm
Section count 12 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1212 g
Active area 227 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 (12 sections)

Simulation: 12 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%

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: 130370-2026
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A magnetic rod is the basic element of building grate separators and magnetic filters. 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 rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). The core is a precise magnetic system generating high induction (Gauss). Such construction ensures full resistance to corrosion, water, oils, and acids.
Metal contaminants are strongly attracted, so removing them with a bare hand or glove can be difficult. The most effective home method is using adhesive tape, which we wrap around the dirt and peel off. 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. High induction is necessary when contaminants are microscopic or weakly magnetic.
Yes, as a manufacturer, we make rods of any length and diameter (standard is dia 25mm and 32mm). You can choose a mounting method consistent with your technical design. We ensure fast realization of special orders and technical advice.

Strengths and weaknesses of rare earth magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They do not lose their magnetic properties even under close interference source,
  • A magnet with a smooth silver surface looks better,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Thanks to flexibility in constructing and the capacity to modify to individual projects,
  • Huge importance in advanced technology sectors – they serve a role in magnetic memories, electric drive systems, medical equipment, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons

Drawbacks and weaknesses of neodymium magnets: application proposals
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using casing - magnetic mount.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The load parameter shown represents the peak performance, obtained under optimal environment, meaning:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a plane free of scratches
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

It is worth knowing that the application force may be lower depending on elements below, in order of importance:
  • Gap (between the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Powerful field

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Bodily injuries

Big blocks can break fingers instantly. Never place your hand betwixt two strong magnets.

Medical interference

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Sensitization to coating

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction happens, cease handling magnets and use protective gear.

GPS and phone interference

GPS units and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.

Material brittleness

Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them cracking into shards.

Do not overheat magnets

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Magnetic media

Do not bring magnets near a purse, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.

Product not for children

Adult use only. Small elements can be swallowed, leading to severe trauma. Keep out of reach of children and animals.

Fire warning

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

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