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Neodymium magnets: strength you're looking for

Looking for huge power in small size? We have in stock complete range of disc, cylindrical and ring magnets. Perfect for for domestic applications, garage and industrial tasks. Check our offer in stock.

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Magnets for underwater searches

Begin your hobby involving underwater treasure hunting! Our double-handle grips (F200, F400) provide grip certainty and huge lifting capacity. Solid, corrosion-resistant housing and reinforced ropes are reliable in rivers and lakes.

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Professional solutions for fixing non-invasive. Threaded grips (external or internal) provide instant organization of work on warehouses. Perfect for mounting lighting, sensors and ads.

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SM 25x325 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130370

GTIN/EAN: 5906301813187

Diameter Ø

25 mm [±1 mm]

Height

325 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 9 500 Gauss [±5%]

984.00 ZŁ with VAT / pcs + price for transport

800.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
800.00 ZŁ
984.00 ZŁ
price from 5 pcs
760.00 ZŁ
934.80 ZŁ
price from 10 pcs
720.00 ZŁ
885.60 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Need advice?

Contact us by phone +48 888 99 98 98 if you prefer contact us using inquiry form the contact page.
Force and structure of neodymium magnets can be reviewed with our force calculator.

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SM 25x325 [2xM8] / N52 - magnetic separator

Specification / characteristics SM 25x325 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130370
GTIN/EAN 5906301813187
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 325 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 - 12 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 25x325 [2xM8] / N52 - magnetic separator
properties values units
remenance Br [min. - max.] ? 14.2-14.7 kGs
remenance Br [min. - max.] ? 1420-1470 mT
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 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²
Technical and environmental data
Elemental analysis
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Ecology and recycling (GPSR)
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 130370-2025
Measurement Calculator
Force (pull)
Magnetic Induction
Input your value in a single field to receive results in all other units immediately.

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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. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.
The outer layer is hygienic acid-resistant steel, approved for food contact. The center is filled with NdFeB magnets and pole pieces, arranged to maximize the field on the tube surface. 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. The most effective home method is using adhesive tape, which we wrap around the dirt and peel off. For easier operation, it is worth considering ordering a rod in a version with a cleaning sleeve.
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. For the food and precision industry, we recommend the highest induction parameters.
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.

Advantages and disadvantages of rare earth magnets.

Advantages
Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • They do not lose strength, even after approximately ten years – the decrease in strength is only ~1% (according to tests),
  • They are extremely resistant to demagnetization induced by external field influence,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets exhibit impressive magnetic induction on the active area,
  • 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 freedom in constructing and the ability to adapt to specific needs,
  • Versatile presence in innovative solutions – they find application in hard drives, drive modules, diagnostic systems, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices
Disadvantages
Cons of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small elements of these magnets can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Magnetic strength at its maximum – what it depends on?
Holding force of 0.00 kg is a theoretical maximum value performed under the following configuration:
  • using a base made of high-permeability steel, functioning as a magnetic yoke
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature
Determinants of practical lifting force of a magnet
Holding efficiency is affected by working environment parameters, mainly (from most important):
  • Gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the power to be lost into the air.
  • Plate material – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Adults only

Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.

Fire warning

Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Hand protection

Large magnets can break fingers instantly. Never put your hand between two strong magnets.

Keep away from computers

Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Maximum temperature

Do not overheat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Medical implants

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

Do not underestimate power

Handle magnets with awareness. Their powerful strength can shock even experienced users. Be vigilant and respect their power.

Warning for allergy sufferers

Certain individuals suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Extended handling may cause skin redness. We strongly advise use safety gloves.

Eye protection

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Keep away from electronics

A strong magnetic field disrupts the functioning of compasses in smartphones and navigation systems. Maintain magnets near a device to avoid damaging the sensors.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98