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UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180320

GTIN/EAN: 5906301813767

5.00

Diameter Ø

42 mm [±1 mm]

Height

20 mm [±1 mm]

Height

9 mm [±1 mm]

Weight

78 g

Magnetization Direction

↑ axial

Load capacity

66.00 kg / 647.24 N

Coating

[NiCuNi] Nickel

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33.95 ZŁ with VAT / pcs + price for transport

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Product card - UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread

Specification / characteristics - UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180320
GTIN/EAN 5906301813767
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 42 mm [±1 mm]
Height 20 mm [±1 mm]
Height 9 mm [±1 mm]
Weight 78 g
Magnetization Direction ↑ axial
Load capacity ~ ? 66.00 kg / 647.24 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 42x20x9 [M6] 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
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%
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: 180320-2026
Magnet Unit Converter
Force (pull)
Field Strength
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The steel cup acts as an armature, concentrating the magnetic flux and increasing capacity even several times. Thanks to this, the holder is more durable, resistant, and safer to mount. The bushing with internal thread allows easy screwing of any element (bolt, hook, handle).
Too long a screw can pass through the bushing and push out or damage the magnet glued into the bottom of the cup. If the screw reaches the bottom of the bushing and is further tightened forcefully, it will destroy the magnet. 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. 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. For side detachment (sliding), the force is only approx. 1/3 of nominal capacity.
Standard coating effectively protects against moisture in indoor conditions. In rain and frost, the coating may degrade over time if not protected. The neodymium magnet itself inside is also nickel-plated.

Pros as well as cons of rare earth magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They retain full power for nearly ten years – the drop is just ~1% (in theory),
  • They maintain their magnetic properties even under external field action,
  • By applying a lustrous layer of silver, the element acquires an aesthetic look,
  • Magnets possess exceptionally strong magnetic induction on the surface,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in designing and the capacity to adapt to complex applications,
  • Universal use in modern industrial fields – they serve a role in magnetic memories, electric drive systems, precision medical tools, also complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets: application proposals
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power 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
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The force parameter is a result of laboratory testing executed under standard conditions:
  • on a base made of structural steel, optimally conducting the magnetic field
  • whose thickness is min. 10 mm
  • with an ideally smooth contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction vertical to the mounting surface
  • in stable room temperature

Determinants of lifting force in real conditions

Bear in mind that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Angle of force application – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Cast iron may attract less.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
Heat warning

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Magnetic media

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Health Danger

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Combustion hazard

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Eye protection

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Eye protection is mandatory.

Do not underestimate power

Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often faster than you can move away.

Nickel allergy

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

Physical harm

Big blocks can crush fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Choking Hazard

These products are not intended for children. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

GPS Danger

An intense magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Security! Details about hazards in the article: Safety of working with magnets.