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

magnetic holder with hook

Catalog no 310432

GTIN/EAN: 5906301814610

5.00
Load capacity 162.00 kg / 1588.68 N
Diameter Ø
75 mm [±1 mm]
Height
68 mm [±1 mm]
Height
18 mm [±1 mm]
Weight
625 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
see technical data »

202.95 zł with VAT / pcs + price for transport

165.00 zł net + 23% VAT / pcs

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Technical - 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 and environmental data

Material specification

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
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Holders with a hook are indispensable in large-format stores and warehouses for suspending advertisements (POS systems). It is a universal hanger that you can move to another place at any time without a trace.
Yes, the hook is an element screwed into a bushing with a metric thread (e.g., M4, M5, M6 - check description). 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. In home and office conditions, they will serve for many years without signs of wear.

Advantages and disadvantages of neodymium magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after around 10 years it drops only by ~1% (theoretically),
  • Magnets very well defend themselves against loss of magnetization caused by external fields,
  • A magnet with a metallic nickel surface has better aesthetics,
  • Magnetic induction on the working part of the magnet is strong,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Thanks to versatility in constructing and the ability to adapt to individual projects,
  • Significant place in modern industrial fields – they are utilized in computer drives, brushless drives, precision medical tools, as well as multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as 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 - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using a housing - magnetic mount.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what affects it?

Holding force of 162.00 kg is a measurement result performed under standard conditions:
  • using a plate made of low-carbon steel, serving as a magnetic yoke
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at room temperature

Key elements affecting lifting force

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Swallowing risk

These products are not suitable for play. Swallowing a few magnets can lead to them attracting across intestines, which poses a direct threat to life and requires immediate surgery.

Warning for heart patients

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Bone fractures

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing anything in their path. Be careful!

Combustion hazard

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Data carriers

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

Phone sensors

Be aware: rare earth magnets produce a field that confuses precision electronics. Keep a separation from your mobile, device, and navigation systems.

Magnets are brittle

NdFeB magnets are sintered ceramics, which means they are very brittle. Impact of two magnets leads to them cracking into shards.

Warning for allergy sufferers

Studies show that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for encased magnets.

Immense force

Handle magnets consciously. Their immense force can surprise even professionals. Plan your moves and do not underestimate their power.

Attention! More info about risks in the article: Safety of working with magnets.