Awaiting delivery Ships in 14 days CO2 GPSR PPWR REACH

SM 18x250 [2xM5] / N42 - magnetic separator

magnetic separator

Catalog no 130275

GTIN/EAN: 5906301812777

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

How we measure these parameters — certificates and measurements

product specifications »

450.00 zł net / pcs

553.50 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
450.00 zł
553.50 zł
price from 10 pcs
405.00 zł
498.15 zł

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.

Order by 14:00 and we’ll ship today!

Technical of the product - SM 18x250 [2xM5] / N42 - magnetic separator

Specification / characteristics - SM 18x250 [2xM5] / N42 - magnetic separator

properties
properties values
Cat. no. 130275
GTIN/EAN 5906301812777
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 250 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 - 11 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 18x250 [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 18x250 [2xM5] / N42

Parameter Value Description / Unit
Diameter (Ø) 18 mm
Total length 250 mm (L)
Active length 214 mm
Section count 9 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~483 g
Active area 121 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 (9 sections)

Simulation: 9 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%

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: 130275-2026
Measurement Calculator

Magnet pull force

Magnetic Field

Type a number in any box, to see the remaining fields convert in real-time.

See also offers

UMGW 16x13x5 [M4] GW / N38 - magnetic holder internal thread
Awaiting delivery Ships in 14 days

UMGW 16x13x5 [M4] GW / N38 - magnetic holder internal thread

3.80 zł brutto / pcs
MW 15x1 / N38 - cylindrical magnet
Awaiting delivery Ships in 14 days

MW 15x1 / N38 - cylindrical magnet

0.800 zł brutto / pcs
MP 30x6x10 / N38 - ring magnet
Awaiting delivery Ships in 14 days

MP 30x6x10 / N38 - ring magnet

16.00 zł brutto / pcs
MPL 30x20x4 / N38 - lamellar magnet
Awaiting delivery Ships in 14 days

MPL 30x20x4 / N38 - lamellar magnet

10.23 zł brutto / pcs
A magnetic rod is the basic element of building grate separators and magnetic filters. 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 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. 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). 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. The economical version (8kGs) handles large pieces of metal perfectly. For the food and precision industry, we recommend the highest induction parameters.
We can produce a rod of non-standard length with any mounting termination. The rod end is strictly adapted to the fastening system in your device. We ensure fast realization of special orders and technical advice.

Pros and cons of neodymium magnets.

Advantages

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by external magnetic fields,
  • By applying a lustrous coating of nickel, the element has an elegant look,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in shaping and the capacity to adapt to unusual requirements,
  • Wide application in modern technologies – they find application in magnetic memories, drive modules, medical equipment, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We recommend cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Detachment force of the magnet in optimal conditions – what affects it?

Holding force of 0.00 kg is a theoretical maximum value performed under standard conditions:
  • with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • with a surface free of scratches
  • under conditions of gap-free contact (metal-to-metal)
  • under axial force direction (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

Bear in mind that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Clearance – existence of any layer (rust, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the flux to be escaped to the other side.
  • Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with NdFeB magnets
Do not give to children

These products are not toys. Accidental ingestion of several magnets can lead to them attracting across intestines, which constitutes a severe health hazard and necessitates urgent medical intervention.

Allergic reactions

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or select versions in plastic housing.

Warning for heart patients

Warning for patients: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Fire risk

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Do not underestimate power

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Heat warning

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will ruin its properties and strength.

Protect data

Powerful magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Phone sensors

Note: rare earth magnets produce a field that confuses sensitive sensors. Keep a separation from your mobile, device, and GPS.

Material brittleness

Neodymium magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets leads to them breaking into small pieces.

Serious injuries

Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

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