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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
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

check 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

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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Product card - 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
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 80 g
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
Engineering data and GPSR

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%

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: 190332-2026
Magnet Unit Converter

Force (pull)

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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. Used for mounting sensors, panels, plates, and exhibition elements.
The screw is solidly seated in the cup, however, moderation must be maintained when tightening the nut. Do not use the magnet as a structural bolt transferring huge mechanical loads in shear. The construction is durable and adapted to industrial conditions.
Maximum operating temperature is 80 degrees Celsius for the standard version. 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. Exact screw dimensions can be found in the product technical table. It is a solid threaded connection, ready for use.
The magnetic system in a cup is more energy-efficient than the magnet itself of the same dimensions. However, such a system works point-wise and requires direct contact with metal.

Pros as well as cons of rare earth magnets.

Advantages

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are remarkably resistant to magnetic field loss caused by magnetic disturbances,
  • By using a smooth coating of silver, the element has an proper look,
  • Neodymium magnets create maximum magnetic induction on a their surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of detailed shaping and modifying to individual applications,
  • Wide application in innovative solutions – they are commonly used in HDD drives, electromotive mechanisms, medical devices, and complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • 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
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is cover - mounting mechanism.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The load parameter shown concerns the limit force, measured under laboratory conditions, specifically:
  • using a sheet made of high-permeability steel, functioning as a circuit closing element
  • whose thickness is min. 10 mm
  • with an ideally smooth contact surface
  • without the slightest air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • at standard ambient temperature

Key elements affecting lifting force

Real force impacted by working environment parameters, mainly (from most important):
  • Distance – the presence of foreign body (rust, tape, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When slipping, 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. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
Data carriers

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Fire warning

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Handling rules

Exercise caution. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can react.

Magnet fragility

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Swallowing risk

Absolutely store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.

Finger safety

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

Phone sensors

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your mobile, device, and GPS.

Thermal limits

Avoid heat. Neodymium magnets are susceptible to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Warning for heart patients

People with a ICD should keep an absolute distance from magnets. The magnetism can stop the operation of the implant.

Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness occurs, cease working with magnets and wear gloves.

Security! Looking for details? Check our post: Are neodymium magnets dangerous?