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neodymium magnets

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

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UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180418

GTIN: 5906301813774

5

Diameter Ø [±0,1 mm]

48 mm

Height [±0,1 mm]

24 mm

Height [±0,1 mm]

11.5 mm

Weight

140 g

Load capacity

80 kg / 784.53 N

59.96 with VAT / pcs + price for transport

48.75 ZŁ net + 23% VAT / pcs

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UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread
Specification/characteristics UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread
properties
values
Cat. no.
180418
GTIN
5906301813774
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
48 mm [±0,1 mm]
Height
24 mm [±0,1 mm]
Height
11.5 mm [±0,1 mm]
Weight
140 g [±0,1 mm]
Load capacity ~ ?
80 kg / 784.53 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 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

The steel cup acts as an armature, concentrating the magnetic flux and increasing capacity even several times. Thanks to this, the holder is more durable, resistant, and safer to mount. The threaded hole allows creating a functional mounting point in seconds.
Care must be taken not to screw the bolt too deep into the magnet bushing. If the screw reaches the bottom of the bushing and is further tightened forcefully, it will destroy the magnet. You can use a spacer washer or lock nut to limit screwing depth.
They are indispensable when building exhibition stands and shop displays (POS systems). They serve as a base for hooks, cable holders, organizers, and lighting systems. Ideal for fixing lighting on machine tools and welding tables.
Nominal capacity (for this model approx. 80 kg) is measured in ideal conditions: perpendicular detachment from thick steel (min. 10mm). On a thin surface or painted cabinet, the magnet will hold much weaker (even by 50-70%). For side detachment (sliding), the force is only approx. 1/3 of nominal capacity.
Steel cups are usually coated with a layer of nickel (shiny) or zinc (matte/bright), providing basic protection. For outdoor applications, we recommend additional protection with varnish or choosing a rubberized (hermetic) version. The whole is well protected for standard workshop and industrial applications.

Pros and cons of NdFeB magnets.

Apart from their notable holding force, neodymium magnets have these key benefits:

  • They do not lose magnetism, even over around ten years – the decrease in power is only ~1% (according to tests),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to freedom in shaping and the ability to modify to unusual requirements,
  • Versatile presence in modern industrial fields – they are used in HDD drives, motor assemblies, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Disadvantages of neodymium magnets:

  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited possibility of creating threads in the magnet and complicated forms - preferred is casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small components of these devices are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum magnetic pulling forcewhat it depends on?

The force parameter is a result of laboratory testing performed under the following configuration:

  • using a base made of mild steel, acting as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • with a surface free of scratches
  • without any insulating layer between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at room temperature

Determinants of lifting force in real conditions

Effective lifting capacity is affected by working environment parameters, such as (from most important):

  • Distance (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet 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 load capacity.

Safety rules for work with neodymium magnets

Danger to the youngest

Absolutely store magnets away from children. Choking hazard is significant, and the effects of magnets connecting inside the body are fatal.

Dust explosion hazard

Powder produced during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Finger safety

Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Powerful field

Be careful. Neodymium magnets act from a distance and connect with massive power, often quicker than you can react.

GPS Danger

An intense magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to prevent damaging the sensors.

Electronic hazard

Very strong magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Do not overheat magnets

Avoid heat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Beware of splinters

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Nickel coating and allergies

Some people have a hypersensitivity to Ni, which is the common plating for neodymium magnets. Prolonged contact may cause dermatitis. We recommend wear safety gloves.

ICD Warning

Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Danger!

More info about hazards in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98