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SM 25x100 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130287

GTIN/EAN: 5906301812807

5.00

Diameter Ø

25 mm [±1 mm]

Height

100 mm [±1 mm]

Weight

360 g

Magnetic Flux

~ 6 500 Gauss [±5%]

246.00 with VAT / pcs + price for transport

200.00 ZŁ net + 23% VAT / pcs

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Lifting power and appearance of a neodymium magnet can be verified on our online calculation tool.

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Technical - SM 25x100 [2xM8] / N42 - magnetic separator

Specification / characteristics - SM 25x100 [2xM8] / N42 - magnetic separator

properties
properties values
Cat. no. 130287
GTIN/EAN 5906301812807
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 100 mm [±1 mm]
Weight 360 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 6 500 Gauss [±5%]
Size/Mount Quantity 2xM8
Polarity circumferential - 3 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N42

Specification / characteristics SM 25x100 [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 25x100 [2xM8] / N42

Parameter Value Description / Unit
Diameter (Ø) 25 mm
Total length 100 mm (L)
Active length 64 mm
Section count 2 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~373 g
Active area 50 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)

Chart 2: Field profile (2 sections)

Chart 3: Temperature performance

Engineering data and GPSR
Material specification
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: 130287-2025
Magnet Unit Converter
Pulling force

Magnetic Induction

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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 rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). 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.
Due to the high power of the magnet, direct removal of filings can be troublesome and time-consuming. 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.
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. 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). We offer various tip options: threaded holes (e.g., M8, M10), protruding screws, flat pivots, mills, or handles. We ensure fast realization of special orders and technical advice.

Pros and cons of rare earth magnets.

Benefits

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their power is durable, and after approximately 10 years it decreases only by ~1% (theoretically),
  • They possess excellent resistance to magnetic field loss when exposed to external magnetic sources,
  • A magnet with a shiny gold surface has better aesthetics,
  • Magnets are distinguished by huge magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of custom creating and modifying to defined applications,
  • Fundamental importance in modern industrial fields – they are used in computer drives, motor assemblies, advanced medical instruments, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complicated shapes in magnets, we propose using casing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Additionally, small components of these devices can complicate diagnosis medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The lifting capacity listed is a theoretical maximum value performed under standard conditions:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • with a thickness minimum 10 mm
  • characterized by even structure
  • with zero gap (no impurities)
  • under axial force vector (90-degree angle)
  • in temp. approx. 20°C

Practical aspects of lifting capacity – factors

During everyday use, the actual holding force is determined by many variables, ranked from the most important:
  • Distance – existence of foreign body (rust, dirt, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Plate thickness – too thin plate does not accept the full field, causing part of the power to be escaped to the other side.
  • Material composition – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
GPS Danger

A strong magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Do not bring magnets near a device to prevent breaking the sensors.

Shattering risk

Neodymium magnets are sintered ceramics, which means they are very brittle. Impact of two magnets will cause them breaking into small pieces.

Protect data

Avoid bringing magnets close to a purse, computer, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Finger safety

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Do not drill into magnets

Dust generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Thermal limits

Avoid heat. NdFeB magnets are susceptible to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Danger to the youngest

Strictly store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are life-threatening.

Pacemakers

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Do not underestimate power

Use magnets consciously. Their powerful strength can surprise even professionals. Stay alert and respect their force.

Warning for allergy sufferers

Some people suffer from a sensitization to Ni, which is the common plating for neodymium magnets. Frequent touching might lead to skin redness. We strongly advise use safety gloves.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98