tel: +48 22 499 98 98

Neodymium magnets – strongest on the market

Want to buy really powerful magnets? We have in stock rich assortment of various shapes and sizes. They are ideal for domestic applications, workshop and industrial tasks. Browse assortment with fast shipping.

check price list and dimensions

Magnet fishing: solid F200/F400 sets

Start your adventure with treasure salvaging! Our double-handle grips (F200, F400) provide safety guarantee and immense power. Solid, corrosion-resistant housing and strong lines are reliable in challenging water conditions.

find searching equipment

Reliable threaded grips

Proven solutions for mounting non-invasive. Threaded mounts (external or internal) guarantee instant organization of work on production halls. They are indispensable mounting lamps, sensors and ads.

see technical specs

🚚 Order by 14:00 – we'll ship same day!

Dhit sp. z o.o.
Product available Ships in 2 days

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

magnetic holder external thread

Catalog no 190322

GTIN/EAN: 5906301813811

5.00

Diameter Ø

20 mm [±1 mm]

Height

15 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

14 g

Load capacity

9.00 kg / 88.26 N

7.22 with VAT / pcs + price for transport

5.87 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
5.87 ZŁ
7.22 ZŁ
price from 100 pcs
5.52 ZŁ
6.79 ZŁ
price from 150 pcs
5.17 ZŁ
6.35 ZŁ
Not sure about your choice?

Call us now +48 888 99 98 98 alternatively send us a note via inquiry form through our site.
Force and appearance of magnets can be verified with our our magnetic calculator.

Orders placed before 14:00 will be shipped the same business day.

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

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

properties
properties values
Cat. no. 190322
GTIN/EAN 5906301813811
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 14 g
Load capacity ~ ? 9.00 kg / 88.26 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGZ 20x15x7 [M4] 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
Technical specification and ecology
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: 190322-2025
Magnet Unit Converter
Force (pull)

Magnetic Induction

Check out more deals

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.
Too strong tightening with a wrench can cause the stud to rotate in the cup or strip the thread. When assembling, use a torque wrench or tighten with feeling. 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. Remember that even momentary overheating can weaken the holder.
Thread size (e.g., M6) is always given in the product name and technical specification. Ensure thread length is sufficient to pass through the hole in your material and tighten the nut. 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. This force drops very quickly with increasing distance (air gap).

Advantages as well as disadvantages of rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They do not lose strength, even over nearly ten years – the decrease in lifting capacity is only ~1% (based on measurements),
  • They maintain their magnetic properties even under strong external field,
  • In other words, due to the reflective layer of nickel, the element gains a professional look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • In view of the potential of accurate forming and adaptation to specialized solutions, NdFeB magnets can be manufactured in a variety of shapes and sizes, which amplifies use scope,
  • Huge importance in advanced technology sectors – they are commonly used in computer drives, brushless drives, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Cons of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat affects it?

The load parameter shown concerns the peak performance, obtained under optimal environment, meaning:
  • using a sheet made of high-permeability steel, functioning as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with an polished contact surface
  • without any air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Key elements affecting lifting force

Bear in mind that the application force will differ depending on elements below, starting with the most relevant:
  • Gap (between 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, rust or debris).
  • Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. Alloy additives weaken the attraction effect.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Heat – 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).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

Safety rules for work with NdFeB magnets
Safe operation

Exercise caution. Rare earth magnets attract from a long distance and snap with massive power, often quicker than you can move away.

Adults only

Absolutely keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are fatal.

Warning for heart patients

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Magnet fragility

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Mechanical processing

Mechanical processing of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness appears, cease handling magnets and use protective gear.

Maximum temperature

Watch the temperature. Exposing the magnet to high heat will destroy its properties and strength.

Electronic hazard

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Compass and GPS

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Serious injuries

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

Danger! More info about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98