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neodymium magnets

We provide blue color magnetic Nd2Fe14B - our proposal. Practically all magnesy neodymowe on our website are available for immediate delivery (see the list). Check out the magnet pricing for more details check the magnet price list

Magnet for treasure hunters F300 GOLD

Where to purchase very strong neodymium magnet? Magnetic holders in solid and airtight steel casing are ideally suited for use in variable and difficult weather conditions, including in the rain and snow more

magnetic holders

Holders with magnets can be used to enhance production, exploring underwater areas, or finding meteorites from gold read...

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UMH 20x7x35 [M4] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310425

GTIN: 5906301814542

5

Diameter Ø

20 mm [±1 mm]

Height

35 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.5 kg / 142.2 N

Coating

[NiCuNi] nickel

8.59 with VAT / pcs + price for transport

6.98 ZŁ net + 23% VAT / pcs

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Lifting power along with form of a magnet can be reviewed using our online calculation tool.

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UMH 20x7x35 [M4] / N38 - magnetic holder with hook
Specification/characteristics UMH 20x7x35 [M4] / N38 - magnetic holder with hook
properties
values
Cat. no.
310425
GTIN
5906301814542
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±1 mm]
Height
35 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
21 g
Magnetization Direction
↑ axial
Load capacity ~ ?
14.5 kg / 142.2 N
Coating
[NiCuNi] nickel
Manufacturing Tolerance
±1 mm

Magnetic properties of material N38

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

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

Shopping tips

A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. You can use them to organize wires, hang tools, or clothes on metal racks.
The tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. This gives huge application flexibility and allows adapting the holder to current needs.
The given value defines the maximum load when suspended under a thick, horizontal ceiling beam. 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. 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. Metal elements can rust with constant contact with atmospheric moisture.

Advantages as well as disadvantages of rare earth magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the smooth layer of nickel, the element gains visual value,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Considering the ability of precise molding and customization to unique solutions, NdFeB magnets can be produced in a variety of forms and dimensions, which amplifies use scope,
  • Significant place in future technologies – they find application in magnetic memories, brushless drives, precision medical tools, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions

Cons of neodymium magnets: application proposals

  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complex forms in magnets, we propose using cover - magnetic holder.
  • 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. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Magnetic strength at its maximum – what affects it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, including:

  • with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
  • whose thickness equals approx. 10 mm
  • with a plane cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Practical lifting capacity: influencing factors

During everyday use, the real power results from several key aspects, listed from most significant:

  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.

H&S for magnets

Risk of cracking

Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Keep away from computers

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

Handling guide

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

Medical implants

Patients with a pacemaker have to keep an absolute distance from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Warning for allergy sufferers

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness happens, immediately stop working with magnets and wear gloves.

Phone sensors

Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and GPS.

Demagnetization risk

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Finger safety

Mind your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Combustion hazard

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

Danger to the youngest

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

Caution!

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