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SM 18x175 [2xM5] / N42 - magnetic separator

magnetic separator

Catalog no 130272

GTIN/EAN: 5906301812746

Diameter Ø
18 mm [±1 mm]
Height
175 mm [±1 mm]
Weight
0.01 g
Magnetic Flux
~ 5 400 Gauss [±5%]

How we measure these parameters — certificates and measurements

technical details »

315.00 zł net / pcs

387.45 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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Physical properties - SM 18x175 [2xM5] / N42 - magnetic separator

Specification / characteristics - SM 18x175 [2xM5] / N42 - magnetic separator

properties
properties values
Cat. no. 130272
GTIN/EAN 5906301812746
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 18 mm [±1 mm]
Height 175 mm [±1 mm]
Weight 0.01 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 5 400 Gauss [±5%]
Size/Mount Quantity 2xM5
Polarity circumferential - 8 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 18x175 [2xM5] / 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 18x175 [2xM5] / N42

Parameter Value Description / Unit
Diameter (Ø) 18 mm
Total length 175 mm (L)
Active length 139 mm
Section count 6 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~338 g
Active area 79 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) 3.8 kg (theor.)
Induction (surface) ~5 400 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (6 sections)

Simulation: 6 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical and environmental data

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: 130272-2026
Measurement Calculator

Pulling force

Field Strength

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It is the "heart" of every magnetic filter used in industry for cleaning raw materials. Its task is separation (separation) of metal filings from the transported material. High magnetic induction on the surface allows catching the finest iron particles.
The outer layer is hygienic acid-resistant steel, approved for food contact. 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.
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. 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. For basic machine protection against pieces of iron, standard power is sufficient. 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. Contact us for a quote on a non-standard dimension.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • They retain their magnetic properties even under external field action,
  • Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
  • Magnets possess maximum magnetic induction on the active area,
  • 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 possibility of free shaping and customization to specialized solutions, neodymium magnets can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
  • Universal use in modern technologies – they serve a role in hard drives, electromotive mechanisms, diagnostic systems, also complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

What to avoid - cons of neodymium magnets and ways of using them
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease 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 stable to moisture, in case of application outdoors
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using a housing - magnetic mount.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The specified lifting capacity refers to the limit force, recorded under laboratory conditions, specifically:
  • using a sheet made of mild steel, functioning as a circuit closing element
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a surface free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Practical lifting capacity: influencing factors

It is worth knowing that the application force may be lower depending on the following factors, in order of importance:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the holding force is lower. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Precision electronics

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Sensitization to coating

Studies show that nickel (the usual finish) is a common allergen. For allergy sufferers, prevent touching magnets with bare hands and choose encased magnets.

Flammability

Dust generated during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Medical implants

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Thermal limits

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Safe operation

Exercise caution. Rare earth magnets act from a distance and connect with massive power, often faster than you can move away.

Bone fractures

Pinching hazard: The attraction force is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Keep away from computers

Do not bring magnets near a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Product not for children

Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Keep away from kids and pets.

Shattering risk

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Caution! More info about risks in the article: Magnet Safety Guide.