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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

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11.91 ZŁ with VAT / pcs + price for transport

9.68 ZŁ net + 23% VAT / pcs

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Lifting power and shape of a neodymium magnet can be estimated on our magnetic mass calculator.

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Technical - 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 specification and ecology
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%
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: 180317-2026
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Pulling force
Magnetic Field
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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. Moreover, the metal housing protects the brittle neodymium magnet from cracking upon impact. The threaded hole allows creating a functional mounting point in seconds.
Too long a screw can pass through the bushing and push out or damage the magnet glued into the bottom of the cup. We recommend checking thread depth before assembly and shortening the screw if necessary. It is worth securing the thread with thread glue if the connection is to be durable and resistant to vibrations.
They are indispensable when building exhibition stands and shop displays (POS systems). They enable creating demountable connections that can be easily moved. In the workshop, they can serve as mounting points for tools or measuring instruments.
This value applies to perfect adherence with the entire magnet surface. Air gap (rust, paint, dirt) also drastically lowers holding power. For side detachment (sliding), the force is only approx. 1/3 of nominal capacity.
The housing has anti-corrosion protection in the form of galvanic zinc or nickel plating. In rain and frost, the coating may degrade over time if not protected. The neodymium magnet itself inside is also nickel-plated.

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain attractive force for almost 10 years – the loss is just ~1% (according to analyses),
  • They have excellent resistance to magnetism drop as a result of external magnetic sources,
  • A magnet with a smooth gold surface is more attractive,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in shaping and the ability to modify to individual projects,
  • Versatile presence in modern industrial fields – they are utilized in mass storage devices, motor assemblies, medical equipment, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend 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 power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 prevent oxidation and corrosion.
  • Limited ability of making nuts in the magnet and complex shapes - preferred is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

The specified lifting capacity represents the peak performance, measured under laboratory conditions, specifically:
  • with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • with total lack of distance (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Magnet lifting force in use – key factors

Holding efficiency is influenced by working environment parameters, such as (from most important):
  • Distance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Permanent damage

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its properties and pulling force.

Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, cease handling magnets and use protective gear.

Eye protection

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Immense force

Handle magnets consciously. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their power.

Danger to pacemakers

Individuals with a pacemaker must keep an large gap from magnets. The magnetism can interfere with the functioning of the life-saving device.

Physical harm

Pinching hazard: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Threat to navigation

Be aware: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your mobile, tablet, and GPS.

Do not give to children

Only for adults. Tiny parts pose a choking risk, causing severe trauma. Keep away from children and animals.

Machining danger

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Data carriers

Very strong magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Stay away of min. 10 cm.

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