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SM 18x200 [2xM5] / N42 - magnetic separator

magnetic separator

Catalog no 130273

GTIN/EAN: 5906301812753

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

How we measure these parameters — certificates and measurements

product parameters »

360.00 zł net / pcs

442.80 zł with VAT (23% VAT) / pcs

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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 18x200 [2xM5] / N42 - magnetic separator

Specification / characteristics - SM 18x200 [2xM5] / N42 - magnetic separator

properties
properties values
Cat. no. 130273
GTIN/EAN 5906301812753
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 200 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 - 9 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 18x200 [2xM5] / N42 - magnetic separator
properties values units
remenance Br [min. - max.] ? 12.9-13.2 kGs
remenance Br [min. - max.] ? 1290-1320 mT
coercivity bHc ? 10.8-12.0 kOe
coercivity bHc ? 860-955 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 40-42 BH max MGOe
energy density [min. - max.] ? 318-334 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 18x200 [2xM5] / N42

Parameter Value Description / Unit
Diameter (Ø) 18 mm
Total length 200 mm (L)
Active length 164 mm
Section count 7 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~387 g
Active area 93 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 (7 sections)

Simulation: 7 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical specification and ecology

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%

Sustainability

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: 130273-2026
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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 construction relies on a sealed, welded stainless steel housing, polished smooth. The center is filled with NdFeB magnets and pole pieces, arranged to maximize the field on the tube surface. Thanks to this, the rod is durable, hygienic, and easy to keep clean.
Due to the high power of the magnet, direct removal of filings can be troublesome and time-consuming. We recommend sticking packing tape to the cluster of filings and tearing it off together with the contaminants. In industry, cover tubes (so-called Easy Clean system) are used, from which the magnetic insert slides out.
Magnetic induction measured in Gauss (Gs) determines the density of magnetic flux on the rod surface. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. For the food and precision industry, we recommend the highest induction parameters.
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

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
  • They are resistant to demagnetization induced by external disturbances,
  • By using a lustrous layer of gold, the element presents an nice look,
  • Magnets are distinguished by excellent magnetic induction on the outer side,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise machining as well as adapting to individual needs,
  • Huge importance in modern industrial fields – they serve a role in mass storage devices, brushless drives, diagnostic systems, also technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

The declared magnet strength represents the limit force, recorded under laboratory conditions, meaning:
  • using a sheet made of high-permeability steel, acting as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • with an polished contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical application of breakaway force (90-degree angle)
  • at temperature room level

Practical aspects of lifting capacity – factors

It is worth knowing that the working load may be lower influenced by elements below, starting with the most relevant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Cast iron may attract less.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Cards and drives

Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Heat sensitivity

Do not overheat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Material brittleness

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Medical interference

People with a ICD should keep an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.

Keep away from children

Neodymium magnets are not suitable for play. Eating a few magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

GPS Danger

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.

Nickel allergy

A percentage of the population have a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause a rash. We recommend wear protective gloves.

Crushing risk

Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.

Handling guide

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Dust is flammable

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

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