FAQ
Order Status

tel: +48 22 499 98 98

Neodymium magnets: power you're looking for

Need reliable magnetic field? Our range includes wide selection of various shapes and sizes. Best choice for home use, garage and industrial tasks. Browse assortment in stock.

check price list and dimensions

Magnet fishing sets (searchers)

Start your adventure with treasure salvaging! Our specialized grips (F200, F400) provide grip certainty and immense power. Solid, corrosion-resistant housing and reinforced ropes will perform in challenging water conditions.

choose your water magnet

Industrial magnetic grips mounting

Professional solutions for mounting without drilling. Threaded grips (external or internal) provide quick improvement of work on warehouses. They are indispensable mounting lamps, sensors and ads.

check industrial applications

🚚 Order by 14:00 – we'll ship today!

Dhit sp. z o.o.
0
0.00 ZŁ
  1. home
  2. handles magnets internal thread type-d
  3. int. thread holder umgw 20x15x7 [m4] gw / n38
← previous
next →
Product available Ships today (order by 14:00)

UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180316

GTIN/EAN: 5906301813729

5.00

Diameter Ø

20 mm [±1 mm]

Height

15 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

15.5 g

Load capacity

9.00 kg / 88.26 N

6.49 ZŁ with VAT / pcs + price for transport

5.28 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
5.28 ZŁ
6.49 ZŁ
price from 100 pcs
4.96 ZŁ
6.10 ZŁ
price from 300 pcs
4.65 ZŁ
5.72 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Need help making a decision?

Pick up the phone and ask +48 22 499 98 98 alternatively get in touch using our online form through our site.
Force as well as structure of neodymium magnets can be checked on our online calculation tool.

Orders submitted before 14:00 will be dispatched today!

UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

Specification / characteristics UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

properties
properties values
Cat. no. 180316
GTIN/EAN 5906301813729
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 15.5 g
Load capacity ~ ? 9.00 kg / 88.26 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal 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%
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: 180316-2025
Measurement Calculator
Pulling force
Field Strength
Just complete a single box, to let the tool compute everything else instantly.

View also products

MPL 15x15x5 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 15x15x5 / N38 - lamellar magnet

4.03 ZŁ brutto / pcs
SMZR 25x250 / N52 - magnetic separator with handle
Product available Ships today (order by 14:00)

SMZR 25x250 / N52 - magnetic separator with handle

676.50 ZŁ brutto / pcs
UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread
Product available Ships today (order by 14:00)

UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

40.59 ZŁ brutto / pcs
HH 25x7.7 [M5] / N38 - through hole magnetic holder
Product available Ships today (order by 14:00)

HH 25x7.7 [M5] / N38 - through hole magnetic holder

11.44 ZŁ brutto / pcs
The steel housing shields the magnetic field from the sides and top, directing all its power downwards (to the active side). Moreover, the metal housing protects the brittle neodymium magnet from cracking upon impact. The bushing with internal thread allows easy screwing of any element (bolt, hook, handle).
The most important rule is choosing the appropriate length of the screw being screwed in. If the screw reaches the bottom of the bushing and is further tightened forcefully, it will destroy the magnet. It is worth securing the thread with thread glue if the connection is to be durable and resistant to vibrations.
They are indispensable when building exhibition stands and shop displays (POS systems). They serve as a base for hooks, cable holders, organizers, and lighting systems. In the workshop, they can serve as mounting points for tools or measuring instruments.
Nominal capacity (for this model approx. 9.00 kg) is measured in ideal conditions: perpendicular detachment from thick steel (min. 10mm). With thin sheets (e.g., car body, fridge casing), the force will be much smaller because steel cannot absorb the entire magnetic field. We always recommend choosing a magnet with power reserve, especially if the surface is not ideal.
Standard coating effectively protects against moisture in indoor conditions. In rain and frost, the coating may degrade over time if not protected. The neodymium magnet itself inside is also nickel-plated.

Pros as well as cons of rare earth magnets.

Advantages
Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They do not lose strength, even over nearly ten years – the decrease in strength is only ~1% (based on measurements),
  • Magnets very well protect themselves against loss of magnetization caused by external fields,
  • A magnet with a shiny nickel surface is more attractive,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Considering the option of free forming and customization to specialized requirements, neodymium magnets can be produced in a wide range of geometric configurations, which expands the range of possible applications,
  • Fundamental importance in high-tech industry – they serve a role in data components, electric drive systems, diagnostic systems, and industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
Characteristics of disadvantages of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing threads in the magnet and complicated forms - recommended is cover - magnet mounting.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these magnets can be problematic in diagnostics medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?
The lifting capacity listed is a theoretical maximum value conducted under standard conditions:
  • with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • under conditions of no distance (metal-to-metal)
  • under perpendicular force direction (90-degree angle)
  • in neutral thermal conditions
Magnet lifting force in use – key factors
It is worth knowing that the magnet holding will differ subject to elements below, in order of importance:
  • Clearance – existence of foreign body (paint, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Warnings
Physical harm

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

Dust is flammable

Powder created during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Product not for children

Absolutely keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.

Avoid contact if allergic

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, cease handling magnets and use protective gear.

Beware of splinters

Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Maximum temperature

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Health Danger

Warning for patients: Powerful magnets affect electronics. Maintain at least 30 cm distance or request help to handle the magnets.

Do not underestimate power

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

Precision electronics

GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Protect data

Data protection: Strong magnets can damage payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Attention! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98