← previous
next →
Product available Ships today (order by 14:00) CO2 GPSR PPWR REACH

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

How we measure these parameters — certificates and measurements

check specifications »

9.68 zł net / pcs

11.91 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
9.68 zł
11.91 zł
price from 50 pcs
9.10 zł
11.19 zł
price from 200 pcs
8.52 zł
10.48 zł

Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

Technical specification - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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

Chemical composition

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
Magnet Unit Converter

Force (pull)

Magnetic Field

Input your value in just one field to see the conversion for all other units at once.

See also proposals

MP 25x8x5 / N38 - ring magnet
Product available Ships today (order by 14:00)

MP 25x8x5 / N38 - ring magnet

5.90 zł brutto / pcs
MW 25x12 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 25x12 / N38 - cylindrical magnet

16.64 zł brutto / pcs
MW 12x3 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 12x3 / N38 - cylindrical magnet

1.648 zł brutto / pcs
MW 12.5x2 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 12.5x2 / N38 - cylindrical magnet

0.935 zł brutto / pcs
The steel housing shields the magnetic field from the sides and top, directing all its power downwards (to the active side). Thanks to this, the holder is more durable, resistant, and safer to mount. 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. 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 serve as a base for hooks, cable holders, organizers, and lighting systems. 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.
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 neodymium magnet itself inside is also nickel-plated.

Pros and cons of Nd2Fe14B magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over around 10 years – the drop in lifting capacity is only ~1% (based on measurements),
  • They maintain their magnetic properties even under external field action,
  • Thanks to the shiny finish, the coating of nickel, gold-plated, or silver-plated gives an visually attractive appearance,
  • Magnetic induction on the working layer of the magnet turns out to be impressive,
  • 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 accurate shaping as well as adjusting to defined applications,
  • Versatile presence in modern industrial fields – they are commonly used in HDD drives, motor assemblies, advanced medical instruments, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in miniature devices

Disadvantages

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their force 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

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

The load parameter shown represents the peak performance, recorded under ideal test conditions, specifically:
  • using a sheet made of low-carbon steel, functioning as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • with an ideally smooth touching surface
  • with direct contact (no impurities)
  • during detachment in a direction vertical to the plane
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

In real-world applications, the real power depends on many variables, ranked from crucial:
  • Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
  • Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Dust explosion hazard

Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Protective goggles

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

Danger to pacemakers

Individuals with a heart stimulator have to maintain an large gap from magnets. The magnetic field can disrupt the operation of the life-saving device.

Adults only

Only for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Crushing force

Danger of trauma: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Thermal limits

Watch the temperature. Heating the magnet to high heat will ruin its magnetic structure and strength.

Compass and GPS

Remember: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

Warning for allergy sufferers

It is widely known that nickel (the usual finish) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands or opt for coated magnets.

Handling rules

Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Electronic hazard

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

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