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UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180316

GTIN/EAN: 5906301813729

5.00
Load capacity 9.00 kg / 88.26 N
Diameter Ø
20 mm [±1 mm]
Height
15 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
15.5 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
product parameters »

6.49 zł with VAT / pcs + price for transport

5.28 zł net + 23% VAT / pcs

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Technical parameters - UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

Specification / characteristics - UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180316
GTIN/EAN 5906301813729
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 20 mm [±1 mm]
Height 15 mm [±1 mm]
Height 7 mm [±1 mm]
Weight 15.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.00 kg / 88.26 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 20x15x7 [M4] 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: 180316-2026
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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. Moreover, the metal housing protects the brittle neodymium magnet from cracking upon impact. The bushing with internal thread allows easy screwing of any element (bolt, hook, handle).
The most important rule is choosing the appropriate length of the screw being screwed in. 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.
These holders are commonly used in industry, advertising, and construction for quick mounting. They allow mounting without drilling in steel substrate, which is crucial in rented spaces. Ideal for fixing lighting on machine tools and welding tables.
This value applies to perfect adherence with the entire magnet surface. On a thin surface or painted cabinet, the magnet will hold much weaker (even by 50-70%). 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 whole is well protected for standard workshop and industrial applications.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over around 10 years – the reduction in lifting capacity is only ~1% (according to tests),
  • They retain their magnetic properties even under close interference source,
  • A magnet with a smooth silver surface has better aesthetics,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact shaping as well as modifying to defined requirements,
  • Wide application in innovative solutions – they are commonly used in computer drives, brushless drives, medical devices, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Detachment force of the magnet in optimal conditions – what contributes to it?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:
  • using a plate made of low-carbon steel, serving as a magnetic yoke
  • whose transverse dimension is min. 10 mm
  • with an polished touching surface
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Real force is affected by working environment parameters, such as (from most important):
  • Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – high temperature weakens pulling force. 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, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Warnings
Eye protection

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them shattering into small pieces.

Caution required

Handle with care. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.

Fire warning

Powder created during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Allergic reactions

Studies show that nickel (standard magnet coating) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands or select encased magnets.

Demagnetization risk

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. Damage is permanent.

Electronic hazard

Avoid bringing magnets close to a purse, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.

ICD Warning

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Choking Hazard

Adult use only. Tiny parts can be swallowed, leading to intestinal necrosis. Store away from children and animals.

Precision electronics

A strong magnetic field interferes with the functioning of compasses in phones and navigation systems. Do not bring magnets close to a smartphone to prevent breaking the sensors.

Pinching danger

Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Danger! Details about risks in the article: Magnet Safety Guide.