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neodymium magnets

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BM 550x180x70 [4x M8] - magnetic beam

magnetic beam

Catalog no 090221

GTIN: 5906301812562

5

length [±0,1 mm]

550 mm

Width [±0,1 mm]

180 mm

Height [±0,1 mm]

70 mm

Weight

35320 g

5708.18 with VAT / pcs + price for transport

4640.80 ZŁ net + 23% VAT / pcs

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BM 550x180x70 [4x M8] - magnetic beam
Specification/characteristics BM 550x180x70 [4x M8] - magnetic beam
properties
values
Cat. no.
090221
GTIN
5906301812562
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
550 mm [±0,1 mm]
Width
180 mm [±0,1 mm]
Height
70 mm [±0,1 mm]
Weight
35320 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material

properties
values
units

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 separator is tasked with cleaning the product (coal, aggregate, recycling) from steel contaminants. It is usually mounted above the conveyor belt (so-called overbelt) or in chutes. Ensures high quality of the final product in plastic recycling, wood, and the food industry.
Ferrite is cheaper and has deeper field penetration, which is good with a thick layer of raw material. They are ideal for catching large pieces of iron (screws, nails, cans, excavator teeth) from a long distance. Neodymiums are unrivaled in catching fine filings, wires, and small screws. The choice depends on the size of contaminants and the thickness of the raw material layer on the belt.
We make our magnetic beams entirely of acid-resistant steel AISI 304 or 316 (on request). This ensures full resistance to corrosion, water, and difficult weather conditions. It can be safely used in contact with loose food (flour, sugar, grain).
Cleaning a plate separator (static) is done manually. 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.
Yes, we are a manufacturer and make plate separators to any size. We design separators according to the orderer's requirements, taking into account material specifics. Contact us to receive a free quote and technical drawing.

Pros as well as cons of NdFeB magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They feature excellent resistance to magnetism drop when exposed to external magnetic sources,
  • A magnet with a metallic nickel surface has better aesthetics,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • 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...
  • Due to the ability of free shaping and adaptation to individualized requirements, neodymium magnets can be modeled in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Fundamental importance in electronics industry – they serve a role in data components, drive modules, diagnostic systems, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

  • 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 secures them against impacts but also raises their durability
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and 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
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complex forms in magnets, we propose using a housing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditionswhat it depends on?

Breakaway force was defined for the most favorable conditions, assuming:

  • on a base made of mild steel, optimally conducting the magnetic flux
  • whose thickness reaches at least 10 mm
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

In practice, the real power depends on a number of factors, presented from crucial:

  • Gap (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Angle of force application – highest force is reached only during perpendicular pulling. The shear force of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of force. Check the thermal limit for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a slight gap {between} the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets

Product not for children

Adult use only. Tiny parts can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.

Pacemakers

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Crushing force

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

Safe distance

Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Nickel allergy

A percentage of the population experience a contact allergy to Ni, which is the common plating for NdFeB magnets. Frequent touching might lead to an allergic reaction. We recommend use protective gloves.

Precision electronics

A strong magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Keep magnets near a smartphone to avoid breaking the sensors.

Heat warning

Keep cool. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Safe operation

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Eye protection

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

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