tel: +48 22 499 98 98

neodymium magnets

We offer yellow color magnets Nd2Fe14B - our proposal. Practically all "magnets" on our website are available for immediate purchase (check the list). Check out the magnet pricing for more details see the magnet price list

Magnet for treasure hunters F200 GOLD

Where to buy strong magnet? Magnetic holders in airtight and durable enclosure are ideally suited for use in difficult weather conditions, including snow and rain check

magnetic holders

Holders with magnets can be used to improve manufacturing, underwater exploration, or searching for space rocks from gold more information...

Order is shipped on the same day before 2:00 PM on weekdays.

Dhit sp. z o.o.
Product available Ships in 2 days

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

through hole magnetic holder

Catalog no 370482

GTIN: 5906301814924

5.00

Diameter Ø

25 mm [±1 mm]

Height

7.7 mm [±1 mm]

Weight

23.8 g

Magnetization Direction

↑ axial

Load capacity

17 kg / 166.71 N

Coating

[NiCuNi] Nickel

11.44 with VAT / pcs + price for transport

9.30 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
9.30 ZŁ
11.44 ZŁ
price from 100 pcs
8.74 ZŁ
10.75 ZŁ
price from 200 pcs
8.18 ZŁ
10.07 ZŁ

Want to talk magnets?

Contact us by phone +48 22 499 98 98 if you prefer get in touch through form through our site.
Strength along with shape of magnetic components can be checked using our magnetic calculator.

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

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

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

properties
properties values
Cat. no. 370482
GTIN 5906301814924
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 7.7 mm [±1 mm]
Weight 23.8 g
Magnetization Direction ↑ axial
Load capacity ~ ? 17 kg / 166.71 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics HH 25x7.7 [M5] / N38 - through hole magnetic holder
properties values units
remenance Br [Min. - Max.] ? 12.2-12.6 kGs
remenance Br [Min. - Max.] ? 1220-1260 T
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 106 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

View more products

This construction allows solid screwing of the magnet to the substrate using a bolt or rivet. They are used as bumpers, door stops, flap holders, and mounting elements in machines.
Similarly to other neodymium magnets, caution should be exercised when tightening the screw. It is worth using a washer if the screw head is small to distribute pressure.
Thanks to this, the through-hole holder has much greater lifting capacity than the magnet alone of these dimensions. Air gap, rust, or paint weaken the magnet's action.
These holders are ideal for mounting on non-magnetic surfaces such as wood, furniture board, plasterboard, or plastic. Great as mounting points in advertising and exhibition.
The steel housing and magnet are covered with an anti-corrosion layer (nickel, zinc, or chrome). For outdoor applications, we recommend additional protection with varnish or choosing a rubberized version.

Advantages as well as disadvantages of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

  • They retain full power for nearly 10 years – the drop is just ~1% (according to analyses),
  • They feature excellent resistance to magnetic field loss due to external fields,
  • A magnet with a smooth nickel surface is more attractive,
  • Magnetic induction on the working layer of the magnet turns out to be exceptional,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact shaping and adjusting to defined applications,
  • Universal use in modern technologies – they are utilized in computer drives, drive modules, medical equipment, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Problematic aspects of neodymium magnets: application proposals

  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing nuts and complicated shapes in magnets, we recommend using casing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price is higher than average,

Magnetic strength at its maximum – what affects it?

Magnet power is the result of a measurement for ideal contact conditions, taking into account:

  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

In practice, the actual holding force results from a number of factors, presented from crucial:

  • Clearance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost into the air.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets

Medical interference

For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or request help to handle the magnets.

Heat warning

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Crushing risk

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Mechanical processing

Dust produced during grinding of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Do not underestimate power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Nickel allergy

Studies show that nickel (standard magnet coating) is a potent allergen. If you have an allergy, prevent direct skin contact or select encased magnets.

GPS Danger

Note: neodymium magnets produce a field that confuses precision electronics. Keep a separation from your mobile, tablet, and GPS.

Keep away from computers

Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Swallowing risk

Strictly store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are life-threatening.

Material brittleness

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.

Danger!

Learn more about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98