← previous
next →
Product available Ships today (order by 14:00)

SM 25x325 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130349

GTIN/EAN: 5906301812975

Diameter Ø

25 mm [±1 mm]

Height

325 mm [±1 mm]

Weight

1260 g

Magnetic Flux

~ 6 500 Gauss [±5%]

view properties »

910.20 ZŁ with VAT / pcs + price for transport

740.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
740.00 ZŁ
910.20 ZŁ
price from 5 pcs
703.00 ZŁ
864.69 ZŁ
price from 10 pcs
666.00 ZŁ
819.18 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Want to talk magnets?

Pick up the phone and ask +48 888 99 98 98 or contact us through request form the contact form page.
Force along with appearance of magnets can be verified using our modular calculator.

Same-day processing for orders placed before 14:00.

Technical details - SM 25x325 [2xM8] / N42 - magnetic separator

Specification / characteristics - SM 25x325 [2xM8] / N42 - magnetic separator

properties
properties values
Cat. no. 130349
GTIN/EAN 5906301812975
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 25 mm [±1 mm]
Height 325 mm [±1 mm]
Weight 1260 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 6 500 Gauss [±5%]
Size/Mount Quantity 2xM8
Polarity circumferential - 12 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 25x325 [2xM8] / 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 312 - 380 °C
Curie Temperature TF 593 - 716 °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 25x325 [2xM8] / N42

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 325 mm (L)
Active length 289 mm
Section count 12 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~1212 g
Active area 227 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) 10.6 kg (theor.)
Induction (surface) ~6 500 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (12 sections)

Simulation: 12 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: 130349-2026
Quick Unit Converter
Pulling force
Field Strength
Put your value in just one field to generate results for all other fields at once.

Other products

BM 510x180x70 [4x M8] - magnetic beam
Product available Ships today (order by 14:00)

BM 510x180x70 [4x M8] - magnetic beam

5253.21 ZŁ brutto / pcs
UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread
Product available Ships today (order by 14:00)

UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread

23.99 ZŁ brutto / pcs
MPL 20x5x5 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 20x5x5 / N38 - lamellar magnet

2.76 ZŁ brutto / pcs
SM 18x125 [2xM5] / N42 - magnetic separator
Product available Ships today (order by 14:00)

SM 18x125 [2xM5] / N42 - magnetic separator

276.75 ZŁ brutto / pcs
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. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.
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.
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. 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). The rod end is strictly adapted to the fastening system in your device. We ensure fast realization of special orders and technical advice.

Strengths as well as weaknesses of neodymium magnets.

Pros

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well resist against demagnetization caused by foreign field sources,
  • Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in forming and the ability to customize to individual projects,
  • Significant place in modern technologies – they serve a role in data components, electric motors, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

What to avoid - cons of neodymium magnets: application proposals
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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 while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing nuts and complicated forms in magnets, we propose using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

Holding force of 0.00 kg is a theoretical maximum value executed under standard conditions:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • with a cross-section minimum 10 mm
  • with an ideally smooth contact surface
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

In real-world applications, the actual holding force depends on several key aspects, listed from most significant:
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be lost to the other side.
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Threat to electronics

Very strong magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Operating temperature

Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.

Dust is flammable

Machining of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Health Danger

For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Metal Allergy

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, prevent direct skin contact and opt for encased magnets.

Crushing risk

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Material brittleness

Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Safe operation

Use magnets with awareness. Their huge power can surprise even professionals. Stay alert and respect their power.

GPS Danger

Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.

Danger to the youngest

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Store away from kids and pets.

Security! Need more info? Check our post: Are neodymium magnets dangerous?