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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

Coating

[NiCuNi] Nickel

technical details »

7.22 ZŁ with VAT / pcs + price for transport

5.87 ZŁ net + 23% VAT / pcs

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Strength as well as shape of neodymium magnets can be tested on our our magnetic calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical data of the product - 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
Coating [NiCuNi] Nickel
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
Technical and environmental data
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: 190322-2026
Magnet Unit Converter
Force (pull)
Field Strength
Insert data in a box, to see all other values change in real-time.

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This type of holder has a integrated threaded stud (screw), making it perfect for mounting in through holes. 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 threaded stud is an integral part of the steel housing, but avoid overtightening the thread. Do not use the magnet as a structural bolt transferring huge mechanical loads in shear. The construction is durable and adapted to industrial conditions.
Above this temperature, the magnet may irreversibly lose some of its power. 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. Exact screw dimensions can be found in the product technical table. It is a solid threaded connection, ready for use.
Yes, the steel housing (cup) focuses the magnetic field, significantly increasing attraction force on the active side. It is a solution optimized for strong holding with direct contact, not attracting from afar.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain full power for around 10 years – the drop is just ~1% (according to analyses),
  • They possess excellent resistance to magnetism drop when exposed to external magnetic sources,
  • In other words, due to the shiny layer of nickel, the element gains visual value,
  • Neodymium magnets deliver maximum magnetic induction on a their surface, which allows for strong attraction,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise modeling as well as adapting to defined requirements,
  • Versatile presence in advanced technology sectors – they are utilized in magnetic memories, electromotive mechanisms, medical equipment, also industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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 magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Highest magnetic holding force – what affects it?

Holding force of 9.00 kg is a measurement result conducted under specific, ideal conditions:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction perpendicular to the plane
  • at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

It is worth knowing that the application force will differ subject to elements below, starting with the most relevant:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate lowers the load capacity.

Safe handling of NdFeB magnets
Mechanical processing

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Bodily injuries

Pinching hazard: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Medical interference

People with a pacemaker must maintain an large gap from magnets. The magnetism can stop the operation of the implant.

Demagnetization risk

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

Threat to electronics

Intense magnetic fields can destroy records on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Avoid contact if allergic

A percentage of the population experience a sensitization to Ni, which is the standard coating for neodymium magnets. Frequent touching may cause a rash. It is best to use safety gloves.

Phone sensors

Be aware: neodymium magnets produce a field that confuses sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.

Do not underestimate power

Be careful. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can react.

Beware of splinters

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Adults only

Product intended for adults. Small elements pose a choking risk, leading to serious injuries. Store away from children and animals.

Warning! More info about risks in the article: Magnet Safety Guide.