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MP 20x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030187

GTIN/EAN: 5906301812043

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

3.14 kg / 30.79 N

Magnetic Induction

178.11 mT / 1781 Gs

Coating

[NiCuNi] Nickel

see parameters »

3.59 ZŁ with VAT / pcs + price for transport

2.92 ZŁ net + 23% VAT / pcs

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Product card - MP 20x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x3 / N38 - ring magnet

properties
properties values
Cat. no. 030187
GTIN/EAN 5906301812043
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 20 mm [±0,1 mm]
internal diameter Ø 8/4 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 6.79 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.14 kg / 30.79 N
Magnetic Induction ~ ? 178.11 mT / 1781 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x3 / N38 - ring magnet
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

Physical analysis of the assembly - data

The following values represent the direct effect of a engineering analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MP 20x8/4x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1531 Gs
153.1 mT
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
 warning
1 mm 1457 Gs
145.7 mT
 2.84 kg / 6.27 lbs
2843.2 g / 27.9 N
 warning
2 mm 1352 Gs
135.2 mT
 2.45 kg / 5.39 lbs
2446.6 g / 24.0 N
 warning
3 mm 1227 Gs
122.7 mT
 2.02 kg / 4.44 lbs
2016.2 g / 19.8 N
 warning
5 mm 963 Gs
96.3 mT
 1.24 kg / 2.74 lbs
1241.9 g / 12.2 N
 weak grip
10 mm 465 Gs
46.5 mT
 0.29 kg / 0.64 lbs
289.3 g / 2.8 N
 weak grip
15 mm 228 Gs
22.8 mT
 0.07 kg / 0.15 lbs
69.7 g / 0.7 N
 weak grip
20 mm 122 Gs
12.2 mT
 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
 weak grip
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.01 lbs
2.7 g / 0.0 N
 weak grip
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 weak grip
Grip strength decreases significantly with every subsequent millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) strongly diminishes the holding power. Neodymiums operate most effectively in perfect adhesion; gap nullifies the power. Notice how rapidly the load capacity plummet, when the magnet does not adhere flatly to the metal substrate. When designing the mounting, discard additional spacers.

Table 2: Sliding hold (vertical surface)
MP 20x8/4x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.63 kg / 1.38 lbs
628.0 g / 6.2 N
1 mm Stal (~0.2) 0.57 kg / 1.25 lbs
568.0 g / 5.6 N
2 mm Stal (~0.2) 0.49 kg / 1.08 lbs
490.0 g / 4.8 N
3 mm Stal (~0.2) 0.40 kg / 0.89 lbs
404.0 g / 4.0 N
5 mm Stal (~0.2) 0.25 kg / 0.55 lbs
248.0 g / 2.4 N
10 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
15 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section defines the approximate shear load necessary to start the slippage of the magnet downwards along a vertical steel plate (assuming standard friction). This parameter is relative to the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 20x8/4x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.94 kg / 2.08 lbs
942.0 g / 9.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.63 kg / 1.38 lbs
628.0 g / 6.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.31 kg / 0.69 lbs
314.0 g / 3.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.57 kg / 3.46 lbs
1570.0 g / 15.4 N
When hanging a holder on a upright plane (e.g., a fridge), it you can count on only about 20%-30% of its maximum pull force. Gravity and a low friction coefficient influence the fact that products move down easier than they pop off the substrate. Planning a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slip down under a significantly smaller load. Application of an anti-slip coating can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MP 20x8/4x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.31 kg / 0.69 lbs
314.0 g / 3.1 N
1 mm
25%
 0.79 kg / 1.73 lbs
785.0 g / 7.7 N
2 mm
50%
 1.57 kg / 3.46 lbs
1570.0 g / 15.4 N
3 mm
75%
 2.36 kg / 5.19 lbs
2355.0 g / 23.1 N
5 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
10 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
11 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
12 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
A thin sheet is not enough to take in the entire magnetic field, which wastes potential of the holder. Should you attach a powerful product to a thin surface, the flux will pass right through and the holding will be smaller. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid element of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (stability) - power drop
MP 20x8/4x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
 OK
40 °C -2.2% 3.07 kg / 6.77 lbs
3070.9 g / 30.1 N
 OK
60 °C -4.4% 3.00 kg / 6.62 lbs
3001.8 g / 29.4 N
80 °C -6.6% 2.93 kg / 6.47 lbs
2932.8 g / 28.8 N
100 °C -28.8% 2.24 kg / 4.93 lbs
2235.7 g / 21.9 N
Standard neodymium magnets change their properties parameters above the temperature limit. Watch out for overheating – excessive heat can irreversibly demagnetize this product. With increasing heat, the neodymium's power briefly drops. Avoid using this product in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will result in destruction of magnetism.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MP 20x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.71 kg / 8.17 lbs
2 815 Gs
0.56 kg / 1.23 lbs
556 g / 5.5 N
 N/A
1 mm 3.55 kg / 7.83 lbs
2 998 Gs
0.53 kg / 1.17 lbs
533 g / 5.2 N
 3.20 kg / 7.05 lbs
~0 Gs
2 mm 3.36 kg / 7.40 lbs
2 915 Gs
0.50 kg / 1.11 lbs
503 g / 4.9 N
 3.02 kg / 6.66 lbs
~0 Gs
3 mm 3.13 kg / 6.90 lbs
2 815 Gs
0.47 kg / 1.04 lbs
470 g / 4.6 N
 2.82 kg / 6.21 lbs
~0 Gs
5 mm 2.63 kg / 5.81 lbs
2 582 Gs
0.40 kg / 0.87 lbs
395 g / 3.9 N
 2.37 kg / 5.23 lbs
~0 Gs
10 mm 1.47 kg / 3.23 lbs
1 926 Gs
0.22 kg / 0.48 lbs
220 g / 2.2 N
 1.32 kg / 2.91 lbs
~0 Gs
20 mm 0.34 kg / 0.75 lbs
930 Gs
0.05 kg / 0.11 lbs
51 g / 0.5 N
 0.31 kg / 0.68 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
143 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
90 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
59 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
41 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
30 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
22 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a wider radius than a magnet and steel setup. The setup of two magnets creates a more powerful interaction and a larger range of action. Want to build a strong closure? Use a pair of magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the pinch force is extreme. The levitation is slightly lower than the attraction, but still impressive.
*Field value in repulsion mode reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Calculations demonstrate shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MP 20x8/4x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation is a large risk to IT equipment as well as medical implants. These magnets generate a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and glass. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MP 20x8/4x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.90 km/h
(6.36 m/s)
 0.14 J
30 mm 37.58 km/h
(10.44 m/s)
 0.37 J
50 mm 48.50 km/h
(13.47 m/s)
 0.62 J
100 mm 68.58 km/h
(19.05 m/s)
 1.23 J
NdFeB products are delicate – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Corrosion resistance
MP 20x8/4x3 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MP 20x8/4x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 044 Mx 50.4 µWb
Pc Coefficient 0.20 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MP 20x8/4x3 / N38

Environment Effective steel pull Effect
Air (land) 3.14 kg Standard
Water (riverbed) 3.60 kg
(+0.46 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds only ~20% of its max power.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Temperature resistance

*For standard magnets, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.20

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
Chemical composition
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%
Environmental data
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: 030187-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
Input a figure in just one field to receive results in the other units immediately.

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The ring-shaped magnet MP 20x8/4x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 20x8/4x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
The inner hole diameter determines the maximum size of the mounting element. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 20 mm and thickness 3 mm. The pulling force of this model is an impressive 3.14 kg, which translates to 30.79 N in newtons. The mounting hole diameter is precisely 8/4 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of neodymium magnets.

Advantages

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to versatility in constructing and the capacity to adapt to client solutions,
  • Key role in electronics industry – they are utilized in HDD drives, electric drive systems, advanced medical instruments, and technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of producing nuts in the magnet and complicated forms - recommended is cover - mounting mechanism.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Highest magnetic holding force – what contributes to it?

The force parameter is a result of laboratory testing conducted under standard conditions:
  • on a block made of structural steel, effectively closing the magnetic flux
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an ground touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by working environment parameters, including (from priority):
  • Distance (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material type – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of neodymium magnets
Do not give to children

Neodymium magnets are not intended for children. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and requires urgent medical intervention.

Pacemakers

Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Protective goggles

NdFeB magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets leads to them cracking into shards.

Threat to navigation

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease handling magnets and wear gloves.

Keep away from computers

Device Safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Maximum temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Respect the power

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

Serious injuries

Large magnets can smash fingers in a fraction of a second. Under no circumstances put your hand betwixt two attracting surfaces.

Dust is flammable

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

Warning! Details about risks in the article: Safety of working with magnets.