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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

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

see properties »

33.96 ZŁ with VAT / pcs + price for transport

27.61 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Lifting power as well as appearance of magnetic components can be estimated on our online calculation tool.

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Technical - 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
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
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%
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: 190332-2026
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This type of holder has a integrated threaded stud (screw), making it ideal for mounting in through holes. Just pass the thread through the hole in the element and tighten the nut on the other side. They are commonly used in machine building, exhibition stands, lighting, and advertising.
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.
Above this temperature, the magnet may irreversibly lose some of its power. We also offer holders made of ferrite magnets (resistant up to 200°C) or special high-temperature versions. Avoid mounting directly on hot engine or machine components.
Holders are equipped with standard metric threads (e.g., M4, M6, M8, M10). Ensure thread length is sufficient to pass through the hole in your material and tighten the nut. The thread is made of galvanized steel, ensuring corrosion resistance.
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.

Strengths as well as weaknesses of rare earth magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • Neodymium magnets remain extremely resistant to demagnetization caused by external interference,
  • Thanks to the shiny finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to modularity in shaping and the capacity to customize to specific needs,
  • Versatile presence in advanced technology sectors – they are commonly used in mass storage devices, electric drive systems, medical devices, also technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating threads in the magnet and complex forms - recommended is cover - magnet mounting.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Highest magnetic holding force – what contributes to it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • on a plate made of mild steel, effectively closing the magnetic field
  • whose transverse dimension is min. 10 mm
  • characterized by smoothness
  • with zero gap (no impurities)
  • under perpendicular force vector (90-degree angle)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by working environment parameters, including (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the flux to be wasted to the other side.
  • Metal type – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Bodily injuries

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

Phone sensors

Be aware: rare earth magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, tablet, and GPS.

Permanent damage

Do not overheat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Warning for heart patients

Patients with a pacemaker have to maintain an safe separation from magnets. The magnetism can stop the operation of the life-saving device.

Choking Hazard

Neodymium magnets are not intended for children. Eating several magnets may result in them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.

Risk of cracking

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Data carriers

Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Respect the power

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Allergic reactions

A percentage of the population suffer from a contact allergy to nickel, which is the common plating for neodymium magnets. Frequent touching can result in skin redness. It is best to wear safety gloves.

Dust is flammable

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Danger! Need more info? Check our post: Are neodymium magnets dangerous?