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Neodymium magnets: strength you're looking for

Want to buy really powerful magnets? We have in stock rich assortment of various shapes and sizes. They are ideal for home use, workshop and model making. Browse assortment available immediately.

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Magnet fishing sets (searchers)

Start your adventure related to seabed exploration! Our double-handle grips (F200, F400) provide safety guarantee and huge lifting capacity. Stainless steel construction and reinforced ropes will perform in challenging water conditions.

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Industrial magnetic grips mounting

Reliable solutions for mounting non-invasive. Threaded grips (external or internal) guarantee instant organization of work on warehouses. Perfect for installing lamps, sensors and ads.

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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

see parameters »

14.49 ZŁ with VAT / pcs + price for transport

11.78 ZŁ net + 23% VAT / pcs

bulk discounts:

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Weight as well as shape of a neodymium magnet can be reviewed using our magnetic calculator.

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Product card - 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
Chemical composition
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: 310426-2026
Quick Unit Converter
Magnet pull force
Field Strength
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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 nominal capacity (e.g., 25.00 kg) refers to perpendicular (vertical) force when mounted on the ceiling. For heavy ceiling ads or tools, we recommend choosing a magnet with a considerable power reserve.
The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. A bare magnet could crack upon sudden application to metal, and the holder is resistant to this.
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

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • They do not lose their magnetic properties even under close interference source,
  • Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
  • Magnetic induction on the top side of the magnet turns out to be exceptional,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of accurate forming as well as modifying to atypical applications,
  • Key role in innovative solutions – they are commonly used in data components, electric drive systems, diagnostic systems, also modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their force 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in realizing nuts and complex shapes in magnets, we propose using cover - magnetic mount.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Highest magnetic holding force – what it depends on?

Holding force of 25.00 kg is a theoretical maximum value performed under the following configuration:
  • using a sheet made of mild steel, acting as a magnetic yoke
  • whose thickness is min. 10 mm
  • characterized by even structure
  • with total lack of distance (no coatings)
  • during pulling in a direction perpendicular to the mounting surface
  • at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by specific conditions, mainly (from most important):
  • Clearance – existence of foreign body (rust, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Plate material – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.

Warnings
Respect the power

Handle magnets with awareness. Their immense force can surprise even professionals. Plan your moves and respect their power.

Medical interference

For implant holders: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Demagnetization risk

Watch the temperature. Heating the magnet to high heat will ruin its magnetic structure and strength.

Dust is flammable

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Keep away from electronics

An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Keep magnets close to a smartphone to avoid breaking the sensors.

Hand protection

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying everything in their path. Be careful!

Adults only

Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Keep away from children and animals.

Avoid contact if allergic

Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation happens, immediately stop working with magnets and use protective gear.

Magnet fragility

Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Safe distance

Intense magnetic fields can erase data on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Important! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98