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UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180319

GTIN/EAN: 5906301813750

5.00
Load capacity 40.00 kg / 392.27 N
Diameter Ø
36 mm [±1 mm]
Height
18 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
52 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

view properties »

19.50 zł net / pcs

23.99 zł with VAT (23% VAT) / pcs

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price from 1 pcs
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23.99 zł
price from 20 pcs
18.33 zł
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price from 80 pcs
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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.

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Technical details - UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread

Specification / characteristics - UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180319
GTIN/EAN 5906301813750
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 36 mm [±1 mm]
Height 18 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 52 g
Magnetization Direction ↑ axial
Load capacity ~ ? 40.00 kg / 392.27 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 36x18x8 [M8] 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
Engineering data and GPSR

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%

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: 180319-2026
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Pulling force

Magnetic Induction

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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. 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.
These holders are commonly used in industry, advertising, and construction for quick mounting. They serve as a base for hooks, cable holders, organizers, and lighting systems. Ideal for fixing lighting on machine tools and welding tables.
The stated force is the maximum laboratory value obtained on a clean, smooth sheet. 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. For outdoor applications, we recommend additional protection with varnish or choosing a rubberized (hermetic) version. The whole is well protected for standard workshop and industrial applications.

Advantages as well as disadvantages of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their power is durable, and after around ten years it decreases only by ~1% (theoretically),
  • They show high resistance to demagnetization induced by external disturbances,
  • By using a smooth layer of silver, the element gains an proper look,
  • Magnets are characterized by exceptionally strong magnetic induction on the surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
  • Thanks to versatility in constructing and the ability to customize to individual projects,
  • Universal use in modern technologies – they are commonly used in computer drives, motor assemblies, diagnostic systems, as well as multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets decrease 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using a housing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

The specified lifting capacity concerns the peak performance, measured under ideal test conditions, namely:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • with a thickness no less than 10 mm
  • with a surface perfectly flat
  • with direct contact (without paint)
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Lifting capacity in practice – influencing factors

Real force is influenced by working environment parameters, mainly (from priority):
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Swallowing risk

These products are not toys. Swallowing a few magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.

Serious injuries

Risk of injury: The pulling power is so immense that it can cause blood blisters, crushing, and broken bones. Protective gloves are recommended.

Risk of cracking

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Avoid contact if allergic

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Maximum temperature

Watch the temperature. Exposing the magnet to high heat will ruin its properties and pulling force.

Compass and GPS

An intense magnetic field disrupts the functioning of compasses in phones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Protect data

Powerful magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Do not drill into magnets

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Warning for heart patients

Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Powerful field

Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Danger! Looking for details? Read our article: Are neodymium magnets dangerous?