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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

see specifications »

33.95 ZŁ with VAT / pcs + price for transport

27.60 ZŁ net + 23% VAT / pcs

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Specifications as well as form of neodymium magnets can be reviewed using our online calculation tool.

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Technical specification - 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
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%
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: 180320-2026
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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. You can use a spacer washer or lock nut to limit screwing depth.
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.
The stated force is the maximum laboratory value obtained on a clean, smooth sheet. 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 whole is well protected for standard workshop and industrial applications.

Pros as well as cons of rare earth magnets.

Pros

Besides their immense magnetic power, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to magnetic field loss due to opposing magnetic fields,
  • A magnet with a metallic nickel surface is more attractive,
  • Magnets are distinguished by impressive magnetic induction on the outer layer,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • In view of the ability of accurate forming and customization to individualized projects, neodymium magnets can be created in a wide range of geometric configurations, which expands the range of possible applications,
  • Key role in electronics industry – they are utilized in hard drives, electric drive systems, advanced medical instruments, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these devices are able to be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Highest magnetic holding force – what affects it?

Information about lifting capacity was determined for the most favorable conditions, including:
  • using a sheet made of mild steel, acting as a magnetic yoke
  • with a cross-section no less than 10 mm
  • with an ideally smooth contact surface
  • without any insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Determinants of practical lifting force of a magnet

Effective lifting capacity is affected by working environment parameters, such as (from most important):
  • Gap (betwixt the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy steels lower magnetic permeability and lifting capacity.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Avoid contact if allergic

A percentage of the population suffer from a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to skin redness. It is best to use safety gloves.

Dust explosion hazard

Powder produced during machining of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Fragile material

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them breaking into small pieces.

Conscious usage

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

Physical harm

Large magnets can break fingers in a fraction of a second. Do not place your hand betwixt two attracting surfaces.

Threat to electronics

Intense magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Keep away from electronics

Remember: neodymium magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and GPS.

Warning for heart patients

People with a ICD must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Do not overheat magnets

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Adults only

NdFeB magnets are not toys. Eating several magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Security! Want to know more? Read our article: Why are neodymium magnets dangerous?