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neodymium magnets

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UMGW 75x33x18 [M10] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180420

GTIN: 5906301813798

5

Diameter Ø [±0,1 mm]

75 mm

Height [±0,1 mm]

33 mm

Height [±0,1 mm]

18 mm

Weight

475 g

Load capacity

162 kg / 1588.68 N

189.91 with VAT / pcs + price for transport

154.40 ZŁ net + 23% VAT / pcs

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UMGW 75x33x18 [M10] GW / N38 - magnetic holder internal thread

Specification/characteristics UMGW 75x33x18 [M10] GW / N38 - magnetic holder internal thread
properties
values
Cat. no.
180420
GTIN
5906301813798
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
75 mm [±0,1 mm]
Height
33 mm [±0,1 mm]
Height
18 mm [±0,1 mm]
Weight
475 g [±0,1 mm]
Load capacity ~ ?
162 kg / 1588.68 N
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
coercivity bHc ?
860-915
kA/m
coercivity bHc ?
10.8-11.5
kOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
actual internal force iHc
≥ 955
kA/m
actual internal force iHc
≥ 12
kOe
max. temperature ?
≤ 80
°C

Physical properties of NdFeB

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

Neodymium magnetic mounts with internal thread are versatile tools, applied across industrial as well as everyday uses, e.g. in engineering. They contain a magnet, typically NdFeB, enclosed in a metal shell, covered with Zn layer for corrosion protection. The internal thread, ranging from M3 to M10, enables mounting bolts, which simplifies assembly of different components, such as signs, instruments, or lights. They work via a strong magnetic field, that focuses in the contact area, providing load capacity from 1.3 kg to 60 kg, based on mounting dimensions. They are especially useful in the automotive industry, e.g. for attaching body panels, as well as in marketing, for poster placement. Some models come with a rubber shell, e.g. in black or yellow, which protects surfaces from scratches and improves moisture resistance. Advantages cover great strength, simple mounting due to the internal threading, as well as the option to move massive steel components. Still, the grip strength relies on surface thickness, material used, or distance between the holder and the component. It’s important to avoid impacts, as NdFeB magnets are brittle, and over-tightening the bolt can cause damage. In addition, a magnetic zone may interfere with electronics, like phones or data carriers, so holders should be kept away from such equipment. It is recommended to choose holders from reputable manufacturers, to guarantee reliability and safety during use.

Advantages and disadvantages of neodymium magnets NdFeB.

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

  • They do not lose their power nearly ten years – the loss of strength is only ~1% (theoretically),
  • They are very resistant to demagnetization caused by external field interference,
  • Because of the reflective layer of silver, the component looks visually appealing,
  • The outer field strength of the magnet shows elevated magnetic properties,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • The ability for accurate shaping and adjustment to custom needs – neodymium magnets can be manufactured in multiple variants of geometries, which enhances their versatility in applications,
  • Wide application in modern technologies – they are used in data storage devices, electric motors, diagnostic apparatus or even other advanced devices,
  • Compactness – despite their small size, they provide high effectiveness, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • They are prone to breaking when subjected to a powerful impact. If the magnets are exposed to physical collisions, it is advisable to use in a protective case. The steel housing, in the form of a holder, protects the magnet from fracture while also increases its overall robustness,
  • High temperatures may significantly reduce the holding force of neodymium magnets. Typically, above 80°C, they experience permanent loss in performance (depending on shape). To prevent this, we offer heat-resistant magnets marked [AH], capable of working up to 230°C, which makes them perfect for high-temperature use,
  • Due to corrosion risk in humid conditions, it is advisable to use sealed magnets made of plastic for outdoor use,
  • The use of a protective casing or external holder is recommended, since machining multi-axis shapes in neodymium magnets is not feasible,
  • Potential hazard from tiny pieces may arise, when consumed by mistake, which is crucial in the family environments. Furthermore, small elements from these assemblies can disrupt scanning if inside the body,
  • High unit cost – neodymium magnets are more expensive than other types of magnets (e.g., ferrite), which may limit large-scale applications

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The given holding capacity of the magnet represents the highest holding force, assessed under optimal conditions, specifically:

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • of a thickness of at least 10 mm
  • with a polished side
  • in conditions of no clearance
  • in a perpendicular direction of force
  • in normal thermal conditions

Impact of factors on magnetic holding capacity in practice

Practical lifting force is determined by factors, listed from the most critical to the less significant:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) can cause a drop in lifting force of up to 50%.
  • Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
  • Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
  • Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
  • Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
  • Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.

Exercise Caution with Neodymium Magnets

Neodymium magnets are incredibly delicate, they easily fall apart and can become damaged.

Neodymium magnetic are fragile and will break if allowed to collide with each other, even from a distance of a few centimeters. They are coated with a shiny nickel plating similar to steel, but they are not as hard. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.

Magnets may crack or crumble with uncontrolled joining to each other. Remember not to approach them to each other or have them firmly in hands at a distance less than 10 cm.

The magnet is coated with nickel. Therefore, exercise caution if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets can become demagnetized at high temperatures.

Although magnets have shown to retain their effectiveness up to 80°C or 175°F, this temperature may vary depending on the type of material, shape, and intended use of the magnet.

Neodymium magnets are the most powerful magnets ever invented. Their power can shock you.

Familiarize yourself with our information to correctly handle these magnets and avoid significant injuries to your body and prevent damage to the magnets.

Under no circumstances should neodymium magnets be brought close to GPS and smartphones.

Intense magnetic fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

Dust and powder from neodymium magnets are highly flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.

The strong magnetic field generated by neodymium magnets can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also damage videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

 It is important to maintain neodymium magnets out of reach from youngest children.

Neodymium magnets are not toys. Be cautious and make sure no child plays with them. They can be a significant choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing significant injuries, and even death.

Neodymium magnets are not recommended for people with pacemakers.

In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

Safety precautions!

Please read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

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