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SM 18x300 [2xM5] / N42 - magnetic separator

magnetic separator

Catalog no 130277

GTIN/EAN: 5906301812791

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

How we measure these parameters — certificates and measurements

product specifications »

540.00 zł net / pcs

664.20 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 details - SM 18x300 [2xM5] / N42 - magnetic separator

Specification / characteristics - SM 18x300 [2xM5] / N42 - magnetic separator

properties
properties values
Cat. no. 130277
GTIN/EAN 5906301812791
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 300 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 - 13 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 18x300 [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 18x300 [2xM5] / N42

Parameter Value Description / Unit
Diameter (Ø) 18 mm
Total length 300 mm (L)
Active length 264 mm
Section count 11 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~580 g
Active area 149 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 (11 sections)

Simulation: 11 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: 130277-2026
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It is the "heart" of every magnetic filter used in industry for cleaning raw materials. It is mounted in chutes, hoppers, and pipelines to protect production machines from failure. High magnetic induction on the surface allows catching the finest iron particles.
The rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). The center is filled with NdFeB magnets and pole pieces, arranged to maximize the field on the tube surface. 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. You can use compressed air or special non-magnetic strippers (rings). For easier operation, it is worth considering ordering a rod in a version with a cleaning sleeve.
The Gauss value tells us how effectively and deeply the magnet will catch contaminants. For basic machine protection against pieces of iron, standard power is sufficient. For the food and precision industry, we recommend the highest induction parameters.
We fulfill individual orders for bars perfectly matched to your machine or separator. You can choose a mounting method consistent with your technical design. We ensure fast realization of special orders and technical advice.

Pros and cons of neodymium magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • Their strength is maintained, and after approximately ten years it drops only by ~1% (theoretically),
  • They do not lose their magnetic properties even under close interference source,
  • Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an professional appearance,
  • Magnets are distinguished by huge magnetic induction on the outer layer,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to flexibility in shaping and the ability to adapt to individual projects,
  • Universal use in electronics industry – they are utilized in magnetic memories, electromotive mechanisms, advanced medical instruments, also technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we propose using cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, taking into account:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a plane free of scratches
  • under conditions of gap-free contact (metal-to-metal)
  • under axial force direction (90-degree angle)
  • at temperature room level

Key elements affecting lifting force

Real force impacted by specific conditions, mainly (from most important):
  • Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
No play value

NdFeB magnets are not suitable for play. Swallowing several magnets may result in them pinching intestinal walls, which poses a severe health hazard and necessitates urgent medical intervention.

Impact on smartphones

Note: neodymium magnets produce a field that interferes with sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Crushing risk

Pinching hazard: The pulling power is so immense that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Cards and drives

Intense magnetic fields can erase data on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Machining danger

Dust created during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Powerful field

Be careful. Rare earth magnets act from a distance and connect with massive power, often quicker than you can move away.

Maximum temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Avoid contact if allergic

Certain individuals suffer from a contact allergy to nickel, which is the common plating for neodymium magnets. Prolonged contact may cause a rash. It is best to wear safety gloves.

ICD Warning

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Shattering risk

Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Attention! Looking for details? Read our article: Why are neodymium magnets dangerous?