← previous
next →
Product available Ships tomorrow

UMH 25x8x45 [M5] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310426

GTIN/EAN: 5906301814559

5.00

Diameter Ø

25 mm [±1 mm]

Height

45 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

33 g

Magnetization Direction

↑ axial

Load capacity

25.00 kg / 245.17 N

Coating

[NiCuNi] Nickel

technical specifications »

14.49 ZŁ with VAT / pcs + price for transport

11.78 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
11.78 ZŁ
14.49 ZŁ
price from 30 pcs
11.07 ZŁ
13.62 ZŁ
price from 70 pcs
10.37 ZŁ
12.75 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Do you have purchase concerns?

Call us +48 888 99 98 98 alternatively send us a note using contact form our website.
Parameters as well as appearance of a neodymium magnet can be verified on our force calculator.

Same-day processing for orders placed before 14:00.

Technical specification - UMH 25x8x45 [M5] / N38 - magnetic holder with hook

Specification / characteristics - UMH 25x8x45 [M5] / N38 - magnetic holder with hook

properties
properties values
Cat. no. 310426
GTIN/EAN 5906301814559
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 25 mm [±1 mm]
Height 45 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 33 g
Magnetization Direction ↑ axial
Load capacity ~ ? 25.00 kg / 245.17 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 25x8x45 [M5] / 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%
Ecology and recycling (GPSR)
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: 310426-2026
Magnet Unit Converter
Force (pull)
Magnetic Field
Input your value in just one slot to receive results in the other units right away.

Other offers

UMGGW 43x6 [M4] GW / N38 - magnetic holder rubber internal thread
Product available Ships tomorrow

UMGGW 43x6 [M4] GW / N38 - magnetic holder rubber internal thread

10.46 ZŁ brutto / pcs
MW 45x25 / N38 - cylindrical magnet
Product available Ships tomorrow

MW 45x25 / N38 - cylindrical magnet

101.55 ZŁ brutto / pcs
MW 10x10 / N38 - cylindrical magnet
Product available Ships tomorrow

MW 10x10 / N38 - cylindrical magnet

4.31 ZŁ brutto / pcs
BM 380x180x70 [4x M8] - magnetic beam
Product available Ships tomorrow

BM 380x180x70 [4x M8] - magnetic beam

4185.08 ZŁ brutto / pcs
Holders with a hook are indispensable in large-format stores and warehouses for suspending advertisements (POS systems). In workshops and garages, they work perfectly for guiding cables or hanging work lighting.
The magnet has a standard threaded socket, which allows replacing the hook with any other accessory with a thread. Check the thread size in the product specification to select matching replacements.
The given value defines the maximum load when suspended under a thick, horizontal ceiling beam. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.
The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. The housing ensures mechanical durability, which is important in industrial and assembly conditions.
In the bathroom or kitchen, they will work perfectly, provided they are not directly splashed with water. If you are looking for an outdoor hanger, choose a model in rubberized or plastic housing, which is tight.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to versatility in forming and the ability to customize to specific needs,
  • Significant place in modern industrial fields – they are commonly used in mass storage devices, electromotive mechanisms, precision medical tools, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in producing nuts and complex shapes in magnets, we propose using cover - magnetic holder.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

Magnetic strength at its maximum – what affects it?

Holding force of 25.00 kg is a theoretical maximum value conducted under specific, ideal conditions:
  • on a base made of structural steel, perfectly concentrating the magnetic field
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by working environment parameters, including (from priority):
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Load vector – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Dust is flammable

Powder created during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Hand protection

Danger of trauma: The pulling power is so immense that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Allergy Warning

Studies show that nickel (the usual finish) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands or select encased magnets.

Handling rules

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

Protective goggles

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Life threat

Individuals with a pacemaker have to keep an large gap from magnets. The magnetism can disrupt the functioning of the implant.

Protect data

Avoid bringing magnets near a purse, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Operating temperature

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Compass and GPS

Be aware: rare earth magnets produce a field that confuses precision electronics. Keep a safe distance from your phone, tablet, and GPS.

Do not give to children

Strictly store magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are very dangerous.

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?