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UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190323

GTIN/EAN: 5906301813828

5.00

Diameter Ø

25 mm [±1 mm]

Height

17 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

25 g

Load capacity

17.00 kg / 166.71 N

Coating

[NiCuNi] Nickel

product parameters »

12.23 ZŁ with VAT / pcs + price for transport

9.94 ZŁ net + 23% VAT / pcs

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Technical of the product - UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

Specification / characteristics - UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

properties
properties values
Cat. no. 190323
GTIN/EAN 5906301813828
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 25 mm [±1 mm]
Height 17 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 25 g
Load capacity ~ ? 17.00 kg / 166.71 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGZ 25x17x8 [M5] 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 specification and ecology
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%
Sustainability
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: 190323-2026
Measurement Calculator
Pulling force
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This type of holder has a integrated threaded stud (screw), making it ideal 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.
Too strong tightening with a wrench can cause the stud to rotate in the cup or strip the thread. When assembling, use a torque wrench or tighten with feeling. The magnet itself is protected by a steel cup and is very resistant to impact.
Above this temperature, the magnet may irreversibly lose some of its power. For furnaces, dryers, and powder coating shops, we recommend other types of magnets. Avoid mounting directly on hot engine or machine components.
Thread size (e.g., M6) is always given in the product name and technical specification. 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.
Yes, the steel housing (cup) focuses the magnetic field, significantly increasing attraction force on the active side. However, such a system works point-wise and requires direct contact with metal.

Strengths and weaknesses of Nd2Fe14B magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • They possess excellent resistance to magnetic field loss due to external magnetic sources,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of custom modeling and optimizing to defined conditions,
  • Significant place in high-tech industry – they are utilized in HDD drives, electric drive systems, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in compact constructions

Weaknesses

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complicated forms - preferred is a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

Holding force of 17.00 kg is a result of laboratory testing conducted under the following configuration:
  • with the use of a sheet made of special test steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with an ground contact surface
  • with total lack of distance (without coatings)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Lifting capacity in real conditions – factors

Holding efficiency impacted by specific conditions, such as (from most important):
  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal environment – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Skin irritation risks

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, refrain from direct skin contact or choose versions in plastic housing.

Phone sensors

A strong magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets near a device to prevent damaging the sensors.

Fragile material

Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Maximum temperature

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Cards and drives

Do not bring magnets near a purse, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Pacemakers

People with a pacemaker must keep an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.

Finger safety

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

This is not a toy

Neodymium magnets are not intended for children. Swallowing multiple magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and necessitates urgent medical intervention.

Fire warning

Machining of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Handling rules

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

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