BM 950x180x70 [4x M8] - magnetic beam
magnetic beam
Catalog no 090225
GTIN: 5906301812609
length [±0,1 mm]
950 mm
Width [±0,1 mm]
180 mm
Height [±0,1 mm]
70 mm
Weight
61000 g
8564.49 ZŁ with VAT / pcs + price for transport
6963.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Magnetic properties of material
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Strengths and weaknesses of NdFeB magnets.
Besides their stability, neodymium magnets are valued for these benefits:
- They do not lose power, even during around 10 years – the decrease in lifting capacity is only ~1% (based on measurements),
- They are noted for resistance to demagnetization induced by presence of other magnetic fields,
- The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Magnets have very high magnetic induction on the active area,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Thanks to modularity in shaping and the capacity to customize to unusual requirements,
- Fundamental importance in high-tech industry – they find application in data components, electric motors, medical devices, and other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages of NdFeB magnets:
- At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We suggest casing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
- Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical in case of swallowing.
- With mass production the cost of neodymium magnets can be a barrier,
Detachment force of the magnet in optimal conditions – what affects it?
Information about lifting capacity was defined for the most favorable conditions, including:
- with the contact of a sheet made of special test steel, ensuring maximum field concentration
- possessing a massiveness of at least 10 mm to ensure full flux closure
- characterized by smoothness
- with total lack of distance (no impurities)
- for force acting at a right angle (in the magnet axis)
- at ambient temperature room level
Lifting capacity in practice – influencing factors
It is worth knowing that the magnet holding will differ depending on the following factors, starting with the most relevant:
- Air gap (betwixt the magnet and the plate), since even a very small distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be lost to the other side.
- Material type – the best choice is pure iron steel. Cast iron may attract less.
- Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the lifting capacity.
Warnings
Threat to navigation
A strong magnetic field negatively affects the operation of compasses in phones and navigation systems. Do not bring magnets close to a smartphone to prevent breaking the sensors.
Hand protection
Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!
Magnetic media
Do not bring magnets close to a wallet, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.
Danger to the youngest
Absolutely store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are very dangerous.
Danger to pacemakers
Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Avoid contact if allergic
A percentage of the population have a sensitization to nickel, which is the standard coating for NdFeB magnets. Extended handling may cause an allergic reaction. We strongly advise use protective gloves.
Eye protection
Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them breaking into small pieces.
Maximum temperature
Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).
Machining danger
Fire warning: Rare earth powder is explosive. Avoid machining magnets in home conditions as this risks ignition.
Powerful field
Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.
Safety First!
Details about hazards in the article: Safety of working with magnets.
