SM 25x250 [2xM8] / N42 - magnetic separator
magnetic separator
Catalog no 130293
GTIN: 5906301812869
Diameter Ø [±0,1 mm]
25 mm
Height [±0,1 mm]
250 mm
Weight
0.01 g
688.80 ZŁ with VAT / pcs + price for transport
560.00 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?Hunting for a discount?
Give us a call
+48 22 499 98 98
otherwise send us a note by means of
request form
the contact form page.
Parameters along with form of magnets can be verified with our
force calculator.
Same-day processing for orders placed before 14:00.
Magnetic properties of material N42
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Strengths as well as weaknesses of rare earth magnets.
Besides their tremendous strength, neodymium magnets offer the following advantages:
- They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
- Neodymium magnets are extremely resistant to loss of magnetic properties caused by magnetic disturbances,
- A magnet with a shiny nickel surface has an effective appearance,
- Magnets have maximum 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...
- Thanks to modularity in constructing and the capacity to adapt to complex applications,
- Key role in modern industrial fields – they are used in mass storage devices, electric motors, medical devices, as well as other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages of NdFeB magnets:
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets experience a drop in strength. 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
- They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating nuts and complex forms in magnets, we recommend using a housing - magnetic mount.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these devices can disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Optimal lifting capacity of a neodymium magnet – what contributes to it?
Magnet power was determined for ideal contact conditions, assuming:
- on a base made of mild steel, perfectly concentrating the magnetic field
- possessing a massiveness of min. 10 mm to avoid saturation
- with an ground touching surface
- with zero gap (without paint)
- under axial force direction (90-degree angle)
- at room temperature
Lifting capacity in real conditions – factors
Holding efficiency is affected by specific conditions, including (from priority):
- Gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Chemical composition of the base – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
- Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).
* Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.
H&S for magnets
Metal Allergy
Studies show that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, prevent direct skin contact or choose versions in plastic housing.
No play value
Absolutely keep magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.
Fire risk
Machining of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Pinching danger
Danger of trauma: The attraction force is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.
Magnetic interference
Remember: neodymium magnets generate a field that disrupts precision electronics. Keep a separation from your mobile, tablet, and navigation systems.
Risk of cracking
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.
Cards and drives
Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.
Powerful field
Be careful. Neodymium magnets attract from a long distance and snap with massive power, often faster than you can move away.
Health Danger
Individuals with a ICD have to keep an large gap from magnets. The magnetic field can interfere with the functioning of the implant.
Power loss in heat
Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.
Attention!
Want to know more? Read our article: Why are neodymium magnets dangerous?
