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UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190332

GTIN/EAN: 5906301813859

5.00
Load capacity 66.00 kg / 647.24 N
Diameter Ø
42 mm [±1 mm]
Height
20 mm [±1 mm]
Height
9 mm [±1 mm]
Weight
80 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see technical specifications »

27.61 zł net / pcs

33.96 zł with VAT (23% VAT) / pcs

price for transport

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Quantity
Net
Gross
price from 1 pcs
27.61 zł
33.96 zł
price from 20 pcs
25.95 zł
31.92 zł
price from 30 pcs
24.30 zł
29.89 zł

Frequently asked questions

Which magnetic holder is suitable for moving metal parts in a workshop?
Choose a device designed for the intended handling task and check its rated conditions, attachment point and the steel being gripped. A basic permanent-magnet holder is not a certified device for lifting a load over people.
How do I choose a holder for hanging a heavy item and check its real grip?
Compare the catalogue pull rating with the actual steel thickness, surface condition, gap and load direction. Grip along a vertical surface differs from perpendicular pull. Add an independent mechanical safeguard where falling would cause harm.
Which magnetic holders can be used outdoors?
Check the coating, housing and permitted operating conditions on the individual product card. Rubber can help protect a painted surface, but do not assume that every holder is suitable for permanent immersion or salt spray.
How should I choose a strong threaded holder for field work?
Select an internal or external thread to match the part being attached. Then check the holder dimensions, pull rating, surface condition and moisture protection. Dirt and gaps can reduce practical grip.

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 - UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

Specification / characteristics - UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

properties
properties values
Cat. no. 190332
GTIN/EAN 5906301813859
Distributor Dhit sp. z o.o.
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 80 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 UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external 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 and environmental data

Material specification

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: 190332-2026
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A magnet with a built-in screw is great for screwing with a nut to housings, profiles, and flat bars. Thanks to this, you get a solid, magnetized mounting point without welding or gluing. They are commonly used in machine building, exhibition stands, lighting, and advertising.
Too strong tightening with a wrench can cause the stud to rotate in the cup or strip the thread. We recommend using spring washers to avoid the need for forceful tightening. The magnet itself is protected by a steel cup and is very resistant to impact.
Above this temperature, the magnet may irreversibly lose some of its power. For furnaces, dryers, and powder coating shops, we recommend other types of magnets. Avoid mounting directly on hot engine or machine components.
Thread size (e.g., M6) is always given in the product name and technical specification. Stud length varies depending on the model (usually from 8 to 15 mm). The thread is made of galvanized steel, ensuring corrosion resistance.
Yes, the steel housing (cup) focuses the magnetic field, significantly increasing attraction force on the active side. This force drops very quickly with increasing distance (air gap).

Pros and cons of Nd2Fe14B magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • They do not lose their magnetic properties even under external field action,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Considering the possibility of flexible molding and customization to unique requirements, NdFeB magnets can be created in a wide range of shapes and sizes, which expands the range of possible applications,
  • Wide application in modern industrial fields – they are commonly used in HDD drives, brushless drives, diagnostic systems, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of creating nuts in the magnet and complicated forms - preferred is a housing - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small elements of these products are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

The force parameter is a measurement result executed under the following configuration:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • with a thickness of at least 10 mm
  • with a surface perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical force direction (90-degree angle)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

In practice, the real power results from many variables, presented from the most important:
  • Gap (betwixt the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Precautions when working with neodymium magnets
GPS Danger

GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Do not overheat magnets

Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.

Dust is flammable

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Electronic hazard

Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Crushing risk

Risk of injury: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Protective goggles

Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Do not give to children

Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.

Powerful field

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

Allergic reactions

Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, prevent direct skin contact or choose encased magnets.

Danger to pacemakers

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

Caution! Details about risks in the article: Safety of working with magnets.