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Strong neodymium magnets: discs and cylinders

Looking for huge power in small size? Our range includes complete range of disc, cylindrical and ring magnets. They are ideal for domestic applications, workshop and model making. Browse assortment in stock.

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BM 850x180x70 [4x M8] - magnetic beam

magnetic beam

Catalog no 090224

GTIN/EAN: 5906301812593

5.00

length

850 mm [±1 mm]

Width

180 mm [±1 mm]

Height

70 mm [±1 mm]

Weight

54590 g

7729.93 with VAT / pcs + price for transport

6284.50 ZŁ net + 23% VAT / pcs

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Parameters along with shape of magnetic components can be reviewed with our magnetic mass calculator.

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Technical details - BM 850x180x70 [4x M8] - magnetic beam

Specification / characteristics - BM 850x180x70 [4x M8] - magnetic beam

properties
properties values
Cat. no. 090224
GTIN/EAN 5906301812593
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 850 mm [±1 mm]
Width 180 mm [±1 mm]
Height 70 mm [±1 mm]
Weight 54590 g
Manufacturing Tolerance ±1 mm

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
Engineering data and GPSR
Chemical composition
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%
Environmental data
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: 090224-2025
Measurement Calculator
Magnet pull force

Field Strength

View also products

This separator is tasked with cleaning the product (coal, aggregate, recycling) from steel contaminants. The most common installation place is suspension over the transport belt crosswise or lengthwise. Protects mills, crushers, and shredders from falling screws, excavator teeth, or hammers.
Ferrite separators are characterized by a deep, penetrating magnetic field. We recommend them for protecting machines against large, heavy scrap (so-called tramp iron). Neodymiums are unrivaled in catching fine filings, wires, and small screws. The decision should be made based on the type of separated material and cleanliness requirements.
The separator housing is high-quality stainless steel, welded by TIG method. This guarantees hygiene and ease of cleaning, which is crucial in the food industry. The product meets standards for the food industry (HACCP/IFS/BRC).
Removing contaminants is simple but requires periodic stopping of the process or access to the magnet. Periodically wipe the working surface with a cloth or slide collected metal to the side. Cleaning frequency depends on the amount of contaminants in the product - the more metal, the more often you need to clean.
We can produce a magnetic block perfectly matched to your installation and requirements. We design separators according to the orderer's requirements, taking into account material specifics. Send us dimensions of your conveyor belt and type of raw material, and we will select the appropriate solution.

Pros as well as cons of rare earth magnets.

Strengths

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They feature excellent resistance to magnetism drop when exposed to external fields,
  • In other words, due to the shiny surface of silver, the element becomes visually attractive,
  • They show 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...
  • Due to the potential of accurate molding and adaptation to individualized solutions, magnetic components can be manufactured in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Key role in high-tech industry – they are commonly used in hard drives, electric drive systems, precision medical tools, as well as industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 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 as well as corrosion.
  • We suggest cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The force parameter is a result of laboratory testing conducted under the following configuration:
  • using a base made of mild steel, acting as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

During everyday use, the actual holding force results from several key aspects, ranked from most significant:
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the power to be wasted into the air.
  • Steel type – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Allergy Warning

Certain individuals suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact may cause skin redness. We strongly advise wear safety gloves.

Demagnetization risk

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

Danger to pacemakers

Patients with a ICD should keep an large gap from magnets. The magnetism can interfere with the functioning of the life-saving device.

Dust explosion hazard

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them cracking into shards.

Keep away from electronics

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, device, and navigation systems.

This is not a toy

Absolutely store magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are very dangerous.

Safe distance

Do not bring magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Safe operation

Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often faster than you can react.

Physical harm

Risk of injury: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Important! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98