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neodymium magnets

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UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190322

GTIN: 5906301813811

5

Diameter Ø

20 mm [±1 mm]

Height

15 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

14 g

Load capacity

9 kg / 88.26 N

7.22 with VAT / pcs + price for transport

5.87 ZŁ net + 23% VAT / pcs

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UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
Specification/characteristics UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
properties
values
Cat. no.
190322
GTIN
5906301813811
Production/Distribution
Dhit sp. z o.o.
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
14 g
Load capacity ~ ?
9 kg / 88.26 N
Manufacturing Tolerance
±1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
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

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 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

It is a ready-made mounting element that allows quick creation of a magnetic point. Mounting consists of inserting the screw into the hole and securing with a nut (e.g., wing nut). 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.
Standard neodymium holders are adapted to work in temperatures up to 80°C. If you need resistance to higher temperatures, ask about special versions (H, SH). 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). 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. It is a solution optimized for strong holding with direct contact, not attracting from afar.

Advantages and disadvantages of NdFeB magnets.

Apart from their notable power, neodymium magnets have these key benefits:

  • They do not lose strength, even over nearly ten years – the drop in lifting capacity is only ~1% (based on measurements),
  • They do not lose their magnetic properties even under external field action,
  • By using a lustrous layer of silver, the element has an nice look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to modularity in designing and the capacity to adapt to client solutions,
  • Fundamental importance in advanced technology sectors – they are utilized in computer drives, electromotive mechanisms, diagnostic systems, and technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these products can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:

  • using a base made of mild steel, serving as a circuit closing element
  • whose transverse dimension is min. 10 mm
  • characterized by even structure
  • with zero gap (without paint)
  • during detachment in a direction vertical to the plane
  • at ambient temperature room level

Determinants of lifting force in real conditions

In real-world applications, the actual holding force results from many variables, listed from crucial:

  • Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. In addition, even a slight gap {between} the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and wear gloves.

Implant safety

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Hand protection

Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Choking Hazard

Strictly keep magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are life-threatening.

Demagnetization risk

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Mechanical processing

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Threat to navigation

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Do not bring magnets close to a smartphone to avoid breaking the sensors.

Protective goggles

NdFeB magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them shattering into small pieces.

Handling guide

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Cards and drives

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Security!

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

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98