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UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180316

GTIN/EAN: 5906301813729

5.00

Diameter Ø

20 mm [±1 mm]

Height

15 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

15.5 g

Magnetization Direction

↑ axial

Load capacity

9.00 kg / 88.26 N

Coating

[NiCuNi] Nickel

see technical data »

6.49 ZŁ with VAT / pcs + price for transport

5.28 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Technical - UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

Specification / characteristics - UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180316
GTIN/EAN 5906301813729
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 20 mm [±1 mm]
Height 15 mm [±1 mm]
Height 7 mm [±1 mm]
Weight 15.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.00 kg / 88.26 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
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 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²
Engineering data and GPSR
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 180316-2026
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The steel cup acts as an armature, concentrating the magnetic flux and increasing capacity even several times. The metal cover secures the magnet against mechanical damage, which is common in workshop conditions. The bushing with internal thread allows easy screwing of any element (bolt, hook, handle).
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 used for fixing sensors, lamps, rating plates, machine guards, and installations. They serve as a base for hooks, cable holders, organizers, and lighting systems. In the workshop, they can serve as mounting points for tools or measuring instruments.
Nominal capacity (for this model approx. 9.00 kg) is measured in ideal conditions: perpendicular detachment from thick steel (min. 10mm). Air gap (rust, paint, dirt) also drastically lowers holding power. We always recommend choosing a magnet with power reserve, especially if the surface is not ideal.
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.

Advantages as well as disadvantages of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain magnetic properties for almost 10 years – the drop is just ~1% (in theory),
  • Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
  • In other words, due to the smooth surface of nickel, the element gains visual value,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in designing and the capacity to modify to client solutions,
  • Significant place in electronics industry – they find application in hard drives, motor assemblies, advanced medical instruments, as well as modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose force 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 start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these products can disrupt the diagnostic process medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Detachment force of the magnet in optimal conditions – what affects it?

Holding force of 9.00 kg is a result of laboratory testing conducted under standard conditions:
  • using a base made of high-permeability steel, functioning as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with a surface free of scratches
  • with direct contact (without paint)
  • during pulling in a direction vertical to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

During everyday use, the real power results from many variables, presented from the most important:
  • Distance – existence of any layer (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet and the plate reduces the holding force.

Warnings
Risk of cracking

NdFeB magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets leads to them cracking into shards.

Medical interference

People with a heart stimulator have to maintain an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.

Serious injuries

Danger of trauma: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Data carriers

Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Thermal limits

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

Threat to navigation

GPS units and mobile phones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Dust is flammable

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Immense force

Handle with care. Rare earth magnets act from a distance and snap with massive power, often faster than you can react.

Choking Hazard

NdFeB magnets are not toys. Accidental ingestion of multiple magnets may result in them attracting across intestines, which poses a direct threat to life and necessitates urgent medical intervention.

Nickel coating and allergies

A percentage of the population suffer from a contact allergy to nickel, which is the standard coating for NdFeB magnets. Extended handling can result in dermatitis. We strongly advise use protective gloves.

Warning! Want to know more? Read our article: Why are neodymium magnets dangerous?