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UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180317

GTIN/EAN: 5906301813736

5.00

Diameter Ø

25 mm [±1 mm]

Height

17 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

25.4 g

Magnetization Direction

↑ axial

Load capacity

17.00 kg / 166.71 N

Coating

[NiCuNi] Nickel

technical specifications »

11.91 ZŁ with VAT / pcs + price for transport

9.68 ZŁ net + 23% VAT / pcs

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Technical details - UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

Specification / characteristics - UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180317
GTIN/EAN 5906301813736
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 25.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 17.00 kg / 166.71 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 25x17x8 [M5] 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
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%
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: 180317-2026
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A magnetic holder (magnet in a steel cup) is much stronger on one side than a bare magnet of the same dimensions. 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).
The most important rule is choosing the appropriate length of the screw being screwed in. If the screw reaches the bottom of the bushing and is further tightened forcefully, it will destroy the magnet. It is worth securing the thread with thread glue if the connection is to be durable and resistant to vibrations.
These holders are commonly used in industry, advertising, and construction for quick mounting. They enable creating demountable connections that can be easily moved. In the workshop, they can serve as mounting points for tools or measuring instruments.
The stated force is the maximum laboratory value obtained on a clean, smooth sheet. Air gap (rust, paint, dirt) also drastically lowers holding power. For side detachment (sliding), the force is only approx. 1/3 of nominal capacity.
Standard coating effectively protects against moisture in indoor conditions. However, these are not fully stainless products and may corrode with constant contact with water. The neodymium magnet itself inside is also nickel-plated.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They do not lose power, even after around 10 years – the decrease in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are distinguished by extremely resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a shiny gold surface has an effective appearance,
  • They show high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of accurate shaping as well as optimizing to atypical needs,
  • Key role in electronics industry – they are commonly used in hard drives, drive modules, precision medical tools, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

What to avoid - cons of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in producing threads and complex shapes in magnets, we propose using a housing - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these products are able to 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

Holding force characteristics

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

The declared magnet strength represents the maximum value, measured under ideal test conditions, namely:
  • using a sheet made of low-carbon steel, functioning as a circuit closing element
  • with a thickness of at least 10 mm
  • with an ideally smooth touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Lifting capacity in practice – influencing factors

During everyday use, the real power results from a number of factors, listed from crucial:
  • Distance (betwixt the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Load vector – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin plate does not accept the full field, causing part of the flux to be wasted to the other side.
  • Plate material – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets
Flammability

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Operating temperature

Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Electronic devices

Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Nickel allergy

A percentage of the population experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause an allergic reaction. We suggest wear protective gloves.

Shattering risk

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Finger safety

Watch your fingers. Two large magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Do not underestimate power

Handle magnets with awareness. Their huge power can surprise even professionals. Stay alert and do not underestimate their power.

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Magnetic interference

Be aware: rare earth magnets produce a field that disrupts precision electronics. Maintain a separation from your mobile, tablet, and GPS.

No play value

Product intended for adults. Tiny parts pose a choking risk, causing severe trauma. Store out of reach of children and animals.

Danger! Learn more about hazards in the article: Safety of working with magnets.