HH 25x7.7 [M5] / N38 - through hole magnetic holder

Advantages as well as disadvantages of rare earth magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They retain full power for around 10 years – the loss is just ~1% (according to analyses),
• They have excellent resistance to weakening of magnetic properties due to external fields,
• Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
• The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of accurate creating and optimizing to concrete requirements,
• Universal use in future technologies – they are used in data components, electromotive mechanisms, medical devices, and complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices

Disadvantages of neodymium magnets:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
• Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices are able to be problematic in diagnostics medical when they are in the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Highest magnetic holding force – what it depends on?

Holding force of 17.00 kg is a result of laboratory testing performed under the following configuration:

• with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
• with a thickness of at least 10 mm
• with a surface cleaned and smooth
• without the slightest clearance between the magnet and steel
• under perpendicular force vector (90-degree angle)
• at conditions approx. 20°C

Determinants of lifting force in real conditions

During everyday use, the actual lifting capacity results from a number of factors, presented from the most important:

• Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
• Direction of force – highest force is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
• Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
• Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
• Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate lowers the load capacity.

Advantages as well as disadvantages of rare earth magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They retain full power for around 10 years – the loss is just ~1% (according to analyses),
• They have excellent resistance to weakening of magnetic properties due to external fields,
• Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
• The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of accurate creating and optimizing to concrete requirements,
• Universal use in future technologies – they are used in data components, electromotive mechanisms, medical devices, and complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices

Disadvantages of neodymium magnets:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
• Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices are able to be problematic in diagnostics medical when they are in the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Highest magnetic holding force – what it depends on?

Holding force of 17.00 kg is a result of laboratory testing performed under the following configuration:

• with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
• with a thickness of at least 10 mm
• with a surface cleaned and smooth
• without the slightest clearance between the magnet and steel
• under perpendicular force vector (90-degree angle)
• at conditions approx. 20°C

Determinants of lifting force in real conditions

During everyday use, the actual lifting capacity results from a number of factors, presented from the most important:

• Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
• Direction of force – highest force is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
• Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
• Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
• Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate lowers the load capacity.