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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
Load capacity 17.00 kg / 166.71 N
Diameter Ø
25 mm [±1 mm]
Height
17 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
25.4 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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11.91 zł with VAT / pcs + price for transport

9.68 zł net + 23% VAT / pcs

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Product card - 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

Elemental analysis

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: 180317-2026
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The steel cup acts as an armature, concentrating the magnetic flux and increasing capacity even several times. Moreover, the metal housing protects the brittle neodymium magnet from cracking upon impact. The threaded hole allows creating a functional mounting point in seconds.
The most important rule is choosing the appropriate length of the screw being screwed in. Neodymium magnets are brittle, and direct pressure from a screw can cause them to crack or detach. You can use a spacer washer or lock nut to limit screwing depth.
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.
Nominal capacity (for this model approx. 17.00 kg) is measured in ideal conditions: perpendicular detachment from thick steel (min. 10mm). With thin sheets (e.g., car body, fridge casing), the force will be much smaller because steel cannot absorb the entire magnetic field. We always recommend choosing a magnet with power reserve, especially if the surface is not ideal.
Steel cups are usually coated with a layer of nickel (shiny) or zinc (matte/bright), providing basic protection. 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 as well as cons of neodymium magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • Their magnetic field remains stable, and after around 10 years it drops only by ~1% (according to research),
  • They retain their magnetic properties even under close interference source,
  • By using a shiny coating of nickel, the element gains an professional look,
  • Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Due to the option of free shaping and adaptation to individualized needs, neodymium magnets can be produced in a broad palette of geometric configurations, which expands the range of possible applications,
  • Universal use in modern industrial fields – they are utilized in magnetic memories, electric drive systems, advanced medical instruments, also technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to 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.
  • Due to limitations in producing nuts and complicated forms in magnets, we recommend using casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can disrupt the diagnostic process 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

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The specified lifting capacity represents the maximum value, obtained under optimal environment, meaning:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • with a thickness of at least 10 mm
  • with an ground touching surface
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Please note that the magnet holding will differ influenced by the following factors, in order of importance:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. Alloy additives weaken the attraction effect.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Adults only

Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.

Life threat

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Combustion hazard

Powder created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Nickel coating and allergies

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

Handling rules

Handle magnets with awareness. Their huge power can shock even professionals. Stay alert and respect their power.

Bone fractures

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

Electronic hazard

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Thermal limits

Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Material brittleness

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

Impact on smartphones

An intense magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Keep magnets close to a device to avoid breaking the sensors.

Warning! Learn more about risks in the article: Magnet Safety Guide.