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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

technical parameters »

6.49 ZŁ with VAT / pcs + price for transport

5.28 ZŁ net + 23% VAT / pcs

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Physical properties - 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
Chemical composition
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%
Ecology and recycling (GPSR)
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
Magnet Unit Converter
Force (pull)
Field Strength
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The steel housing shields the magnetic field from the sides and top, directing all its power downwards (to the active side). 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. We recommend checking thread depth before assembly and shortening the screw if necessary. 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. 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). 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.
Standard coating effectively protects against moisture in indoor conditions. In rain and frost, the coating may degrade over time if not protected. The whole is well protected for standard workshop and industrial applications.

Pros and cons of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
  • Magnetic induction on the surface of the magnet turns out to be strong,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to the ability of precise forming and adaptation to individualized requirements, NdFeB magnets can be manufactured in a variety of geometric configurations, which amplifies use scope,
  • Wide application in electronics industry – they are utilized in computer drives, electric drive systems, precision medical tools, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited possibility of producing nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices are able to complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

The load parameter shown represents the maximum value, measured under laboratory conditions, namely:
  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with a plane free of scratches
  • with zero gap (without paint)
  • for force acting at a right angle (pull-off, not shear)
  • at temperature room level

Key elements affecting lifting force

Real force impacted by working environment parameters, mainly (from most important):
  • Air gap (between the magnet and the plate), since even a very small distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Power loss in heat

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Health Danger

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Dust is flammable

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Protective goggles

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Nickel allergy

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.

Handling rules

Use magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and respect their force.

GPS and phone interference

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.

Safe distance

Do not bring magnets close to a purse, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Keep away from children

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.

Crushing force

Risk of injury: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Safety First! Want to know more? Check our post: Are neodymium magnets dangerous?