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Neodymium magnets – strongest on the market

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UMH 75x18x68 [M8] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310432

GTIN/EAN: 5906301814610

5.00

Diameter Ø

75 mm [±1 mm]

Height

68 mm [±1 mm]

Height

18 mm [±1 mm]

Weight

625 g

Magnetization Direction

↑ axial

Load capacity

162.00 kg / 1588.68 N

Coating

[NiCuNi] Nickel

view parameters »

202.95 ZŁ with VAT / pcs + price for transport

165.00 ZŁ net + 23% VAT / pcs

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Give us a call +48 888 99 98 98 or contact us using form the contact section.
Lifting power and structure of a magnet can be verified with our force calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical of the product - UMH 75x18x68 [M8] / N38 - magnetic holder with hook

Specification / characteristics - UMH 75x18x68 [M8] / N38 - magnetic holder with hook

properties
properties values
Cat. no. 310432
GTIN/EAN 5906301814610
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 75 mm [±1 mm]
Height 68 mm [±1 mm]
Height 18 mm [±1 mm]
Weight 625 g
Magnetization Direction ↑ axial
Load capacity ~ ? 162.00 kg / 1588.68 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 75x18x68 [M8] / N38 - magnetic holder with hook
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

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
Technical specification and ecology
Elemental analysis
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: 310432-2026
Quick Unit Converter
Pulling force
Magnetic Field
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A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. In workshops and garages, they work perfectly for guiding cables or hanging work lighting.
The tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. Thanks to this, one magnet can perform many functions - sometimes be a hook, and sometimes a holder for a bolt.
The given value defines the maximum load when suspended under a thick, horizontal ceiling beam. When mounting on a wall (vertically), the holding force is much lower due to shear force (the magnet may slide).
The cup acts as a magnetic armature, intensifying the neodymium action and increasing efficiency. Additionally, steel protects the brittle magnet from cracking upon hitting the ceiling or beam.
Standard holders are coated with a layer of nickel or zinc, which protects them from corrosion indoors. Metal elements can rust with constant contact with atmospheric moisture.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • Their strength remains stable, and after around 10 years it decreases only by ~1% (theoretically),
  • Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
  • In other words, due to the aesthetic layer of gold, the element becomes visually attractive,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • In view of the possibility of precise molding and adaptation to individualized solutions, magnetic components can be manufactured in a broad palette of shapes and sizes, which makes them more universal,
  • Key role in electronics industry – they find application in mass storage devices, motor assemblies, precision medical tools, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating nuts and complicated forms in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum holding power of the magnet – what affects it?

Breakaway force is the result of a measurement for ideal contact conditions, assuming:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • whose thickness equals approx. 10 mm
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Key elements affecting lifting force

In practice, the real power results from a number of factors, presented from most significant:
  • Distance – existence of foreign body (rust, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be wasted to the other side.
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Handling rules

Handle magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their force.

Danger to pacemakers

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

No play value

NdFeB magnets are not intended for children. Swallowing several magnets may result in them pinching intestinal walls, which poses a severe health hazard and necessitates urgent medical intervention.

GPS and phone interference

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Dust is flammable

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

Electronic hazard

Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Permanent damage

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

Allergy Warning

It is widely known that the nickel plating (the usual finish) is a common allergen. If you have an allergy, avoid direct skin contact and choose versions in plastic housing.

Pinching danger

Large magnets can crush fingers instantly. Never place your hand between two attracting surfaces.

Beware of splinters

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets will cause them breaking into small pieces.

Security! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98