e-mail: bok@dhit.pl

neodymium magnets

We provide yellow color magnets Nd2Fe14B - our store's offer. All magnesy neodymowe on our website are available for immediate purchase (see the list). Check out the magnet price list for more details check the magnet price list

Magnets for treasure hunters F300 GOLD

Where to purchase strong neodymium magnet? Magnetic holders in airtight, solid steel casing are ideally suited for use in difficult, demanding weather conditions, including during snow and rain see

magnetic holders

Holders with magnets can be used to facilitate production processes, exploring underwater areas, or finding space rocks from gold check...

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SM 25x250 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130371

GTIN: 5906301813194

5.00

Diameter Ø

25 mm [±1 mm]

Height

250 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 9 500 Gauss [±5%]

762.60 with VAT / pcs + price for transport

620.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Weight along with structure of magnets can be tested using our force calculator.

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SM 25x250 [2xM8] / N52 - magnetic separator

Specification / characteristics SM 25x250 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130371
GTIN 5906301813194
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 250 mm [±1 mm]
Weight 0.01 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 9 500 Gauss [±5%]
Size/Mount Quantity 2xM8
Polarity circumferential - 9 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 25x250 [2xM8] / N52 - magnetic separator
properties values units
remenance Br [Min. - Max.] ? 14.2-14.7 kGs
remenance Br [Min. - Max.] ? 1420-1470 T
coercivity bHc ? 10.8-12.5 kOe
coercivity bHc ? 860-995 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [Min. - Max.] ? 48-53 BH max MGOe
energy density [Min. - Max.] ? 380-422 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 106 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Other products

It is the "heart" of every magnetic filter used in industry for cleaning raw materials. 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 outer layer is hygienic acid-resistant steel, approved for food contact. The core is a precise magnetic system generating high induction (Gauss). Such construction ensures full resistance to corrosion, water, oils, and acids.
Metal contaminants are strongly attracted, so removing them with a bare hand or glove can be difficult. We recommend sticking packing tape to the cluster of filings and tearing it off together with the contaminants. 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. 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. 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.

Advantages and disadvantages of rare earth magnets.

Besides their durability, neodymium magnets are valued for these benefits:

  • They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets effectively resist against demagnetization caused by foreign field sources,
  • In other words, due to the shiny surface of silver, the element is aesthetically pleasing,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the possibility of flexible molding and customization to individualized solutions, neodymium magnets can be produced in a variety of shapes and sizes, which makes them more universal,
  • Versatile presence in electronics industry – they find application in HDD drives, motor assemblies, precision medical tools, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in miniature devices

Disadvantages of NdFeB magnets:

  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power 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 advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using casing - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these products are able to complicate diagnosis medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Maximum lifting force for a neodymium magnet – what it depends on?

The declared magnet strength represents the maximum value, measured under ideal test conditions, specifically:

  • using a plate made of low-carbon steel, functioning as a ideal flux conductor
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • characterized by smoothness
  • with direct contact (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

In practice, the actual holding force is determined by a number of factors, presented from most significant:

  • Clearance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was determined using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets

Respect the power

Handle magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and respect their power.

Swallowing risk

NdFeB magnets are not intended for children. Eating a few magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires immediate surgery.

Precision electronics

Remember: rare earth magnets produce a field that interferes with precision electronics. Maintain a safe distance from your phone, tablet, and GPS.

Heat warning

Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Mechanical processing

Fire warning: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

ICD Warning

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Electronic hazard

Very strong magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Shattering risk

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Crushing risk

Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, refrain from direct skin contact and select encased magnets.

Danger!

Want to know more? Read our article: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98