UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread
rubber magnetic holder external thread
Catalog no 340313
GTIN: 5906301814757
Diameter Ø [±0,1 mm]
88 mm
Height [±0,1 mm]
8.5 mm
Weight
193 g
Load capacity
42.9 kg / 420.71 N
40.59 ZŁ with VAT / pcs + price for transport
33.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Advantages and disadvantages of rare earth magnets.
Besides their tremendous pulling force, neodymium magnets offer the following advantages:
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
- They are resistant to demagnetization induced by external magnetic fields,
- The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- They show high magnetic induction at the operating surface, which affects their effectiveness,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to versatility in shaping and the ability to adapt to individual projects,
- Huge importance in future technologies – they are commonly used in magnetic memories, drive modules, advanced medical instruments, and other advanced devices.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Disadvantages of neodymium magnets:
- To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
- Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited ability of creating nuts in the magnet and complex forms - recommended is casing - magnet mounting.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can complicate diagnosis medical after entering the body.
- With large orders the cost of neodymium magnets is economically unviable,
Detachment force of the magnet in optimal conditions – what affects it?
The declared magnet strength refers to the limit force, measured under ideal test conditions, namely:
- with the application of a yoke made of special test steel, ensuring maximum field concentration
- whose transverse dimension reaches at least 10 mm
- with an ground touching surface
- under conditions of ideal adhesion (metal-to-metal)
- under vertical force direction (90-degree angle)
- in temp. approx. 20°C
What influences lifting capacity in practice
Real force is affected by specific conditions, including (from most important):
- Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Steel thickness – insufficiently thick sheet does not close the flux, causing part of the power to be lost to the other side.
- Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
- Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a small distance {between} the magnet and the plate lowers the holding force.
Precautions when working with NdFeB magnets
Adults only
Adult use only. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.
Flammability
Combustion risk: Rare earth powder is explosive. Avoid machining magnets in home conditions as this risks ignition.
Safe operation
Handle with care. Rare earth magnets attract from a distance and connect with huge force, often quicker than you can move away.
Nickel allergy
Studies show that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands and choose encased magnets.
GPS and phone interference
GPS units and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.
Keep away from computers
Do not bring magnets near a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.
Warning for heart patients
Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.
Demagnetization risk
Avoid heat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Protective goggles
Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Serious injuries
Large magnets can crush fingers instantly. Never place your hand betwixt two attracting surfaces.
Danger!
Learn more about risks in the article: Safety of working with magnets.
