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neodymium magnets

We provide red color magnetic Nd2Fe14B - our store's offer. Practically all "magnets" in our store are in stock for immediate purchase (check the list). See the magnet pricing for more details see the magnet price list

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SM 25x125 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130367

GTIN: 5906301813156

0

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

125 mm

Weight

0.01 g

393.60 with VAT / pcs + price for transport

320.00 ZŁ net + 23% VAT / pcs

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SM 25x125 [2xM8] / N52 - magnetic separator
Specification/characteristics SM 25x125 [2xM8] / N52 - magnetic separator
properties
values
Cat. no.
130367
GTIN
5906301813156
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
125 mm [±0,1 mm]
Weight
0.01 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N52

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

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

This product serves to effectively catch ferromagnetic contaminants from bulk and liquid products. 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 construction relies on a sealed, welded stainless steel housing, polished smooth. The core is a precise magnetic system generating high induction (Gauss). Thanks to this, the rod is durable, hygienic, and easy to keep clean.
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. In industry, cover tubes (so-called Easy Clean system) are used, from which the magnetic insert slides out.
The Gauss value tells us how effectively and deeply the magnet will catch contaminants. For basic machine protection against pieces of iron, standard power is sufficient. 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). The rod end is strictly adapted to the fastening system in your device. Contact us for a quote on a non-standard dimension.

Strengths and weaknesses of rare earth magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

  • They retain magnetic properties for almost 10 years – the drop is just ~1% (based on simulations),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the shimmering finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
  • Magnetic induction on the top side of the magnet turns out to be maximum,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to modularity in constructing and the capacity to adapt to individual projects,
  • Key role in high-tech industry – they are used in mass storage devices, drive modules, advanced medical instruments, as well as multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • At strong impacts they can break, therefore we advise placing them in strong housings. 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.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these devices are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what affects it?

The load parameter shown represents the maximum value, obtained under ideal test conditions, meaning:

  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • with a cross-section minimum 10 mm
  • with an ideally smooth touching surface
  • with zero gap (no coatings)
  • under vertical application of breakaway force (90-degree angle)
  • at standard ambient temperature

Magnet lifting force in use – key factors

Real force is influenced by specific conditions, including (from priority):

  • Gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets

Product not for children

Neodymium magnets are not toys. Eating a few magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates urgent medical intervention.

Cards and drives

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Shattering risk

Watch out for shards. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.

Medical implants

Warning for patients: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Safe operation

Use magnets consciously. Their huge power can surprise even experienced users. Be vigilant and do not underestimate their power.

Demagnetization risk

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

Sensitization to coating

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, immediately stop handling magnets and use protective gear.

Combustion hazard

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Pinching danger

Big blocks can crush fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Threat to navigation

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Security!

Learn more about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98