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neodymium magnets

We offer blue color magnetic Nd2Fe14B - our proposal. All magnesy neodymowe in our store are in stock for immediate purchase (see the list). See the magnet price list for more details see the magnet price list

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SM 25x225 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130292

GTIN: 5906301812852

0

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

225 mm

Weight

0.01 g

615.00 with VAT / pcs + price for transport

500.00 ZŁ net + 23% VAT / pcs

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SM 25x225 [2xM8] / N42 - magnetic separator
Specification/characteristics SM 25x225 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130292
GTIN
5906301812852
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
225 mm [±0,1 mm]
Weight
0.01 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N42

properties
values
units
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
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

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

Shopping tips

It is the "heart" of every magnetic filter used in industry for cleaning raw materials. It is commonly used for cleaning flour, sugar, plastic granules, as well as oils and coolants. 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). 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.
The more Gauss, the smaller and more weakly magnetic particles will be effectively caught. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. High Power versions (~12000-14000 Gs) are necessary for catching metallic dust, oxides, and stainless steel after processing.
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. Contact us for a quote on a non-standard dimension.

Advantages as well as disadvantages of rare earth magnets.

Besides their immense field intensity, neodymium magnets offer the following advantages:

  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • Magnets perfectly protect themselves against loss of magnetization caused by foreign field sources,
  • A magnet with a smooth nickel surface has better aesthetics,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the capacity to customize to client solutions,
  • Huge importance in high-tech industry – they are utilized in magnetic memories, electric motors, medical devices, as well as modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Limited possibility of making nuts in the magnet and complicated forms - preferred is cover - mounting mechanism.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The force parameter is a theoretical maximum value conducted under the following configuration:

  • on a plate made of mild steel, effectively closing the magnetic field
  • with a cross-section no less than 10 mm
  • with an ground contact surface
  • with direct contact (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

In real-world applications, the actual lifting capacity is determined by many variables, listed from most significant:

  • Air gap (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be escaped to the other side.
  • Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic properties and holding force.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate lowers the load capacity.

H&S for magnets

Heat warning

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. Damage is permanent.

Combustion hazard

Powder created during grinding of magnets is combustible. Do not drill into magnets unless you are an expert.

Risk of cracking

Protect your eyes. Magnets can fracture upon violent connection, ejecting shards into the air. Eye protection is mandatory.

Magnetic media

Device Safety: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Threat to navigation

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Crushing risk

Large magnets can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Caution required

Exercise caution. Neodymium magnets attract from a long distance and snap with huge force, often quicker than you can move away.

Warning for heart patients

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

Allergic reactions

It is widely known that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, prevent direct skin contact and choose encased magnets.

Danger to the youngest

Always store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.

Caution!

More info about risks in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98