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neodymium magnets

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UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180320

GTIN: 5906301813767

5

Diameter Ø [±0,1 mm]

42 mm

Height [±0,1 mm]

20 mm

Height [±0,1 mm]

9 mm

Weight

78 g

Load capacity

66 kg / 647.24 N

33.95 with VAT / pcs + price for transport

27.60 ZŁ net + 23% VAT / pcs

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UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread

Specification/characteristics UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread
properties
values
Cat. no.
180320
GTIN
5906301813767
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
42 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Height
9 mm [±0,1 mm]
Weight
78 g [±0,1 mm]
Load capacity ~ ?
66 kg / 647.24 N
Manufacturing Tolerance
± 0.1 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 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

Mounting bases with magnets with female thread are universal tools, applied across manufacturing as well as everyday applications, e.g. in automotive. They contain a neodymium magnet, typically neodymium, embedded within a metal housing, coated with Zn layer for corrosion protection. The female thread, available in sizes from M4 to M8, allows insertion of bolts, which simplifies assembly of various components, such as nameplates, instruments, or lights. They operate thanks to a strong magnetic field, which concentrates in the contact area, providing load capacity ranging from one to sixty kilograms, depending on mount size. They are especially useful in the automotive industry, for example, for securing body panels, as well as in advertising, for poster placement. Some models have a rubber coating, e.g. in black or yellow colors, helping prevent surface damage and improves moisture resistance. Benefits include high durability, simple mounting due to the internal threading, and the ability to transport heavy ferromagnetic objects. However, the holding force relies on surface thickness, type of steel, or distance between the holder and the component. Preventing mechanical shocks is crucial, since neodymium magnets are fragile, and overtightening the screw may be dangerous. Moreover, a magnetic zone may interfere with electronics, like phones or data carriers, therefore mounts should be stored away from those devices. Choosing mounts from trusted suppliers is advised, to guarantee reliability and safety during use.

Advantages and disadvantages of neodymium magnets NdFeB.

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

  • They virtually do not lose strength, because even after ten years, the decline in efficiency is only ~1% (in laboratory conditions),
  • Their ability to resist magnetic interference from external fields is among the best,
  • Because of the brilliant layer of nickel, the component looks visually appealing,
  • The outer field strength of the magnet shows advanced magnetic properties,
  • With the right combination of magnetic alloys, they reach increased thermal stability, enabling operation at or above 230°C (depending on the form),
  • The ability for custom shaping or adjustment to specific needs – neodymium magnets can be manufactured in many forms and dimensions, which enhances their versatility in applications,
  • Important function in modern technologies – they serve a purpose in HDDs, electromechanical systems, healthcare devices and sophisticated instruments,
  • Relatively small size with high magnetic force – neodymium magnets offer impressive pulling strength in small dimensions, which makes them useful in small systems

Disadvantages of neodymium magnets:

  • They are fragile when subjected to a sudden impact. If the magnets are exposed to shocks, it is advisable to use in a protective case. The steel housing, in the form of a holder, protects the magnet from fracture and reinforces its overall resistance,
  • Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible performance loss (influenced by the magnet’s profile). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
  • They rust in a humid environment. If exposed to rain, we recommend using waterproof magnets, such as those made of polymer,
  • Using a cover – such as a magnetic holder – is advised due to the limitations in manufacturing complex structures directly in the magnet,
  • Possible threat related to magnet particles may arise, if ingested accidentally, which is notable in the family environments. Additionally, miniature parts from these assemblies may complicate medical imaging when ingested,
  • High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which may limit large-scale applications

Detachment force of the magnet in optimal conditionswhat affects it?

The given pulling force of the magnet means the maximum force, determined in a perfect environment, namely:

  • with mild steel, serving as a magnetic flux conductor
  • with a thickness of minimum 10 mm
  • with a polished side
  • with zero air gap
  • in a perpendicular direction of force
  • at room temperature

Lifting capacity in practice – influencing factors

In practice, the holding capacity of a magnet is affected by the following aspects, arranged from the most important to the least relevant:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) causes 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 checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate reduces the load capacity.

Handle Neodymium Magnets with Caution

Neodymium magnets can demagnetize at high temperatures.

Even though magnets have been observed to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

The magnet coating is made of nickel, so be cautious if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as 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 are particularly delicate, which leads to shattering.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. 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.

  Do not give neodymium magnets to children.

Not all neodymium magnets are toys, so do not let children play with them. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Keep neodymium magnets away from the wallet, computer, and TV.

Magnetic fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times more powerful, and their power can surprise you.

Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.

Avoid bringing neodymium magnets close to a phone or GPS.

Magnetic fields can interfere with compasses and magnetometers used in aviation and maritime navigation, as well as internal compasses of smartphones and GPS devices. There are neodymium magnets in every smartphone, for example, in the microphone and speakers.

Neodymium Magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant injuries.

Magnets will bounce and also clash together within a distance of several to almost 10 cm from each other.

Keep neodymium magnets away from 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. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.

Safety rules!

In order for you to know how powerful neodymium magnets are and why they are so dangerous, read the article - Dangerous strong neodymium magnets.

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tel: +48 888 99 98 98