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neodymium magnets

We offer red color magnetic Nd2Fe14B - our store's offer. Practically all magnesy neodymowe on our website are available for immediate purchase (check the list). See the magnet price list for more details see the magnet price list

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

magnetic separator

Catalog no 130371

GTIN: 5906301813194

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

250 mm

Weight

0.01 g

762.60 with VAT / pcs + price for transport

620.00 ZŁ net + 23% VAT / pcs

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SM 25x250 [2xM8] / N52 - magnetic separator
Specification/characteristics SM 25x250 [2xM8] / N52 - magnetic separator
properties
values
Cat. no.
130371
GTIN
5906301813194
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
250 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 commonly used for cleaning flour, sugar, plastic granules, as well as oils and coolants. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.
The rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). The center is filled with NdFeB magnets and pole pieces, arranged to maximize the field on the tube surface. 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. The most effective home method is using adhesive tape, which we wrap around the dirt and peel off. 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. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. High induction is necessary when contaminants are microscopic or weakly magnetic.
We fulfill individual orders for bars perfectly matched to your machine or separator. You can choose a mounting method consistent with your technical design. We ensure fast realization of special orders and technical advice.

Pros as well as cons of NdFeB magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

  • Their magnetic field is durable, and after approximately 10 years it drops only by ~1% (theoretically),
  • Magnets effectively defend themselves against loss of magnetization caused by external fields,
  • By covering with a decorative coating of silver, the element acquires an proper look,
  • Neodymium magnets create maximum magnetic induction on a their surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the ability of flexible shaping and adaptation to unique needs, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which amplifies use scope,
  • Huge importance in innovative solutions – they serve a role in hard drives, electric drive systems, diagnostic systems, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using casing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these products can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Optimal lifting capacity of a neodymium magnetwhat it depends on?

Magnet power is the result of a measurement for optimal configuration, including:

  • with the contact of a yoke made of special test steel, ensuring maximum field concentration
  • whose thickness equals approx. 10 mm
  • with an ideally smooth touching surface
  • with direct contact (without paint)
  • during detachment in a direction perpendicular to the mounting surface
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the working load will differ depending on the following factors, starting with the most relevant:

  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with neodymium magnets

Handling rules

Handle magnets consciously. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their force.

Do not give to children

Always store magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.

Keep away from electronics

A strong magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.

Shattering risk

NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them breaking into small pieces.

Mechanical processing

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Warning for heart patients

Patients with a ICD should keep an absolute distance from magnets. The magnetism can disrupt the functioning of the life-saving device.

Electronic devices

Do not bring magnets near a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Metal Allergy

Certain individuals experience a contact allergy to Ni, which is the common plating for neodymium magnets. Extended handling can result in skin redness. We suggest use safety gloves.

Serious injuries

Big blocks can break fingers instantly. Never place your hand betwixt two strong magnets.

Heat warning

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Warning!

Looking for details? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98