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SM 28x150 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130519

Diameter Ø
28 mm [±1 mm]
Height
150 mm [±1 mm]
Weight
702.46 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

see properties »

430.00 zł net / pcs

528.90 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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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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Physical properties - SM 28x150 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 28x150 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130519
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 28 mm [±1 mm]
Height 150 mm [±1 mm]
Weight 702.46 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 28x150 [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 28x150 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 28 mm
Total length 150 mm (L)
Active length 114 mm
Section count 4 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~702 g
Active area 100 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) 22.7 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

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: 130519-2026
Measurement Calculator

Force (pull)

Magnetic Induction

Put a figure in just one field to see the conversion in the other fields at once.

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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 rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). 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. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. 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. You can choose a mounting method consistent with your technical design. We ensure fast realization of special orders and technical advice.

Advantages as well as disadvantages of rare earth magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain full power for around ten years – the loss is just ~1% (based on simulations),
  • Magnets effectively defend themselves against loss of magnetization caused by external fields,
  • In other words, due to the aesthetic finish of nickel, the element gains visual value,
  • Magnetic induction on the surface of the magnet remains impressive,
  • 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...
  • Thanks to freedom in shaping and the ability to customize to unusual requirements,
  • Fundamental importance in innovative solutions – they serve a role in mass storage devices, electric motors, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited possibility of creating threads in the magnet and complex shapes - recommended is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum magnetic pulling force – what affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, taking into account:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • characterized by smoothness
  • with zero gap (without paint)
  • during pulling in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Please note that the working load will differ influenced by elements below, in order of importance:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.

H&S for magnets
Powerful field

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Implant safety

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Warning for allergy sufferers

It is widely known that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, prevent direct skin contact and choose coated magnets.

Danger to the youngest

Always keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Magnet fragility

Neodymium magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them breaking into small pieces.

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Dust is flammable

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Cards and drives

Equipment safety: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Serious injuries

Pinching hazard: The attraction force is so immense that it can cause hematomas, crushing, and broken bones. Use thick gloves.

Phone sensors

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Do not bring magnets near a smartphone to prevent damaging the sensors.

Security! Details about risks in the article: Magnet Safety Guide.