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UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190322

GTIN/EAN: 5906301813811

5.00

Diameter Ø

20 mm [±1 mm]

Height

15 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

14 g

Load capacity

9.00 kg / 88.26 N

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7.22 ZŁ with VAT / pcs + price for transport

5.87 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Force and appearance of a neodymium magnet can be estimated using our force calculator.

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Technical specification - UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

Specification / characteristics - UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

properties
properties values
Cat. no. 190322
GTIN/EAN 5906301813811
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 14 g
Load capacity ~ ? 9.00 kg / 88.26 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external 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: 190322-2026
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It is a ready-made mounting element that allows quick creation of a magnetic point. Thanks to this, you get a solid, magnetized mounting point without welding or gluing. They are commonly used in machine building, exhibition stands, lighting, and advertising.
The screw is solidly seated in the cup, however, moderation must be maintained when tightening the nut. We recommend using spring washers to avoid the need for forceful tightening. The magnet itself is protected by a steel cup and is very resistant to impact.
Maximum operating temperature is 80 degrees Celsius for the standard version. We also offer holders made of ferrite magnets (resistant up to 200°C) or special high-temperature versions. Avoid mounting directly on hot engine or machine components.
We use standardized threads that fit typical nuts available in every store. Ensure thread length is sufficient to pass through the hole in your material and tighten the nut. It is a solid threaded connection, ready for use.
The magnetic system in a cup is more energy-efficient than the magnet itself of the same dimensions. It is a solution optimized for strong holding with direct contact, not attracting from afar.

Strengths as well as weaknesses of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain magnetic properties for around 10 years – the loss is just ~1% (according to analyses),
  • They maintain their magnetic properties even under strong external field,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Due to the ability of accurate molding and adaptation to custom needs, NdFeB magnets can be manufactured in a variety of forms and dimensions, which increases their versatility,
  • Fundamental importance in future technologies – they are used in mass storage devices, electromotive mechanisms, medical devices, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited possibility of creating nuts in the magnet and complicated shapes - preferred is cover - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these magnets can complicate diagnosis medical when they are in 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

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Information about lifting capacity was determined for ideal contact conditions, including:
  • with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • with a cross-section of at least 10 mm
  • with a plane cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

Please note that the application force will differ influenced by elements below, in order of importance:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Material composition – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Flammability

Combustion risk: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Medical implants

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Handling guide

Handle magnets consciously. Their powerful strength can shock even professionals. Plan your moves and respect their power.

Safe distance

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

Heat warning

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Allergy Warning

Studies show that nickel (standard magnet coating) is a common allergen. For allergy sufferers, refrain from direct skin contact and choose versions in plastic housing.

Bone fractures

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

Keep away from children

Product intended for adults. Small elements can be swallowed, causing intestinal necrosis. Store away from kids and pets.

Material brittleness

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Keep away from electronics

Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Security! Need more info? Read our article: Are neodymium magnets dangerous?