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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

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3.59 ZŁ with VAT / pcs + price for transport

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Detailed specification - 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

Engineering analysis of the product - report

These information are the result of a engineering simulation. Results rely on models for the material Nd2Fe14B. Real-world performance might slightly differ. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs gap) - interaction chart
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
 medium risk
1 mm 1457 Gs
145.7 mT
 2.84 kg / 6.27 lbs
2843.2 g / 27.9 N
 medium risk
2 mm 1352 Gs
135.2 mT
 2.45 kg / 5.39 lbs
2446.6 g / 24.0 N
 medium risk
3 mm 1227 Gs
122.7 mT
 2.02 kg / 4.44 lbs
2016.2 g / 19.8 N
 medium risk
5 mm 963 Gs
96.3 mT
 1.24 kg / 2.74 lbs
1241.9 g / 12.2 N
 safe
10 mm 465 Gs
46.5 mT
 0.29 kg / 0.64 lbs
289.3 g / 2.8 N
 safe
15 mm 228 Gs
22.8 mT
 0.07 kg / 0.15 lbs
69.7 g / 0.7 N
 safe
20 mm 122 Gs
12.2 mT
 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
 safe
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.01 lbs
2.7 g / 0.0 N
 safe
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 safe
Pulling power drops sharply per each millimeter of gap. Note that every additional insulation layer (e.g., dirt, varnish, rust) strongly diminishes the holding power. Magnets work optimally during direct contact; gap nullifies the power. Observe how quickly the pull force plummet, when the product does not touch flatly to the steel surface. When calculating the assembly, discard unnecessary gaps.

Table 2: Vertical 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
The table below defines the approximate shear load sufficient to start the sliding of the magnet downwards against a vertical steel plate (assuming typical friction). This parameter varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
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 placing a magnet on a upright wall (e.g., a car body), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip cause that products slip easier than they pull off. Designing a vertical fastening? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a much lighter cargo. Utilizing a rubberized coating can effectively increase the grip.

Table 4: Steel thickness (saturation) - 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 incapable of absorb the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you require a sufficiently solid piece of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the magnet works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal resistance (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
Ordinary NdFeB products lose power after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly destroy this product. With increasing heat, the neodymium's force momentarily decreases. Avoid using this product near heat sources higher than its operating temperature limit. Too high temperature will result in permanent loss of magnetic properties.
*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 20x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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 interact from a wider radius than a magnet and steel setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of action. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the collision energy is huge. The repulsion force is slightly lower than the connection force, but still large.
*Field value in repulsion mode drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Note: Calculations show shear force of two identical magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (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
Mechanical watch 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
Extremely neodym field is a large risk to electronics and medical implants. These magnets produce a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (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 very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or injury to skin. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when working with large magnets.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical 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)
Flux value emitted by the pole surface. Essential parameter for generator designers and motors. Pc value determines the working geometry.

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!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Power loss vs temp

*For N38 material, the max working temp is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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.

Technical specification and ecology
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)
Field Strength
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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Mounting is clean and reversible, unlike gluing. This product with a force of 3.14 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
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. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. It's a good idea to use a flexible washer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 8/4 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (20 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 20 mm and thickness 3 mm. The key parameter here is the lifting capacity amounting to approximately 3.14 kg (force ~30.79 N). The mounting hole diameter is precisely 8/4 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of rare earth magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain attractive force for almost ten years – the drop is just ~1% (based on simulations),
  • They are noted for resistance to demagnetization induced by external field influence,
  • In other words, due to the shiny finish of nickel, the element looks attractive,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to the potential of precise forming and customization to individualized projects, magnetic components can be manufactured in a variety of forms and dimensions, which increases their versatility,
  • Significant place in modern industrial fields – they are used in HDD drives, motor assemblies, advanced medical instruments, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 resistant to moisture
  • Limited possibility of producing nuts in the magnet and complicated shapes - recommended is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what it depends on?

The specified lifting capacity refers to the maximum value, recorded under laboratory conditions, meaning:
  • using a plate made of low-carbon steel, functioning as a magnetic yoke
  • with a cross-section minimum 10 mm
  • with an polished touching surface
  • under conditions of no distance (metal-to-metal)
  • during pulling in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Please note that the application force may be lower influenced by the following factors, starting with the most relevant:
  • Gap (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, rust or debris).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate lowers the holding force.

Safe handling of NdFeB magnets
Allergy Warning

Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, prevent direct skin contact and opt for versions in plastic housing.

Handling rules

Handle magnets with awareness. Their immense force can surprise even experienced users. Be vigilant and respect their power.

Product not for children

Absolutely keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.

Impact on smartphones

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Warning for heart patients

Warning for patients: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Protect data

Very strong magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Heat warning

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

Magnets are brittle

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Finger safety

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Combustion hazard

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Important! Learn more about risks in the article: Safety of working with magnets.