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MP 20x10x5 / N38 - ring magnet

ring magnet

Catalog no 030184

GTIN/EAN: 5906301812012

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

8.84 g

Magnetization Direction

↑ axial

Load capacity

5.20 kg / 50.97 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

technical specifications »

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Physical properties - MP 20x10x5 / N38 - ring magnet

Specification / characteristics - MP 20x10x5 / N38 - ring magnet

properties
properties values
Cat. no. 030184
GTIN/EAN 5906301812012
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 8.84 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.20 kg / 50.97 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x10x5 / 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 simulation of the magnet - technical parameters

The following data are the result of a engineering calculation. Results were calculated on algorithms for the material Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Use these calculations as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - characteristics
MP 20x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5917 Gs
591.7 mT
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
 medium risk
1 mm 5321 Gs
532.1 mT
 4.21 kg / 9.27 pounds
4205.9 g / 41.3 N
 medium risk
2 mm 4736 Gs
473.6 mT
 3.33 kg / 7.35 pounds
3332.2 g / 32.7 N
 medium risk
3 mm 4184 Gs
418.4 mT
 2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
 medium risk
5 mm 3216 Gs
321.6 mT
 1.54 kg / 3.39 pounds
1536.2 g / 15.1 N
 low risk
10 mm 1650 Gs
165.0 mT
 0.40 kg / 0.89 pounds
404.2 g / 4.0 N
 low risk
15 mm 907 Gs
90.7 mT
 0.12 kg / 0.27 pounds
122.3 g / 1.2 N
 low risk
20 mm 544 Gs
54.4 mT
 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
 low risk
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.02 pounds
8.5 g / 0.1 N
 low risk
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 pounds
0.8 g / 0.0 N
 low risk
Grip strength weakens drastically per each millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, varnish, rust) significantly diminishes the holding power. Magnets hold most effectively during direct contact; air break kills the power. See how rapidly the load capacity fall, when the product does not touch directly to the steel surface. When planning the mounting, avoid additional spacers.

Table 2: Slippage hold (wall)
MP 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.04 kg / 2.29 pounds
1040.0 g / 10.2 N
1 mm Stal (~0.2) 0.84 kg / 1.86 pounds
842.0 g / 8.3 N
2 mm Stal (~0.2) 0.67 kg / 1.47 pounds
666.0 g / 6.5 N
3 mm Stal (~0.2) 0.52 kg / 1.15 pounds
520.0 g / 5.1 N
5 mm Stal (~0.2) 0.31 kg / 0.68 pounds
308.0 g / 3.0 N
10 mm Stal (~0.2) 0.08 kg / 0.18 pounds
80.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below shows the theoretical weight limit sufficient to cause the shifting of the magnet vertically against a vertical steel plate (assuming typical friction coefficient). This value is relative to the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 20x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.56 kg / 3.44 pounds
1560.0 g / 15.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.04 kg / 2.29 pounds
1040.0 g / 10.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.52 kg / 1.15 pounds
520.0 g / 5.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
When hanging a element on a upright surface (e.g., a car body), it will only hold only about 20%-30% of nominal attraction strength. Gravity and a low friction coefficient mean that holders slip easier than they detach. Want to create a vertical fastening? Consider that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter weight. Application of an anti-slip layer can drastically improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.52 kg / 1.15 pounds
520.0 g / 5.1 N
1 mm
25%
 1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
2 mm
50%
 2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
3 mm
75%
 3.90 kg / 8.60 pounds
3900.0 g / 38.3 N
5 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
10 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
11 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
12 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
A thin sheet cannot absorb the full magnetic flux, which wastes potential of the magnet. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To achieve the maximum of this neodymium's potential, you need a suitably thick backing of metal. The material oversaturation means that on sheet metal structures (e.g., thin profiles), the holder holds weaker. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (stability) - resistance threshold
MP 20x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
 OK
40 °C -2.2% 5.09 kg / 11.21 pounds
5085.6 g / 49.9 N
 OK
60 °C -4.4% 4.97 kg / 10.96 pounds
4971.2 g / 48.8 N
 OK
80 °C -6.6% 4.86 kg / 10.71 pounds
4856.8 g / 47.6 N
100 °C -28.8% 3.70 kg / 8.16 pounds
3702.4 g / 36.3 N
Ordinary NdFeB products change their properties power past the thermal threshold. Watch out for overheating – excessive heat can irreversibly demagnetize this product. With every degree above norm, the neodymium's power briefly decreases. Do not use this magnet in hot environments higher than its safe range. Ignoring the limit will result in irreversible degradation of magnetism.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MP 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.03 kg / 119.11 pounds
6 121 Gs
8.10 kg / 17.87 pounds
8104 g / 79.5 N
 N/A
1 mm 48.76 kg / 107.50 pounds
11 242 Gs
7.31 kg / 16.13 pounds
7314 g / 71.8 N
 43.89 kg / 96.75 pounds
~0 Gs
2 mm 43.70 kg / 96.34 pounds
10 642 Gs
6.55 kg / 14.45 pounds
6555 g / 64.3 N
 39.33 kg / 86.71 pounds
~0 Gs
3 mm 38.98 kg / 85.94 pounds
10 051 Gs
5.85 kg / 12.89 pounds
5847 g / 57.4 N
 35.08 kg / 77.34 pounds
~0 Gs
5 mm 30.63 kg / 67.54 pounds
8 910 Gs
4.60 kg / 10.13 pounds
4595 g / 45.1 N
 27.57 kg / 60.78 pounds
~0 Gs
10 mm 15.96 kg / 35.19 pounds
6 432 Gs
2.39 kg / 5.28 pounds
2394 g / 23.5 N
 14.36 kg / 31.67 pounds
~0 Gs
20 mm 4.20 kg / 9.26 pounds
3 299 Gs
0.63 kg / 1.39 pounds
630 g / 6.2 N
 3.78 kg / 8.33 pounds
~0 Gs
50 mm 0.19 kg / 0.42 pounds
702 Gs
0.03 kg / 0.06 pounds
29 g / 0.3 N
 0.17 kg / 0.38 pounds
~0 Gs
60 mm 0.09 kg / 0.20 pounds
480 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.18 pounds
~0 Gs
70 mm 0.05 kg / 0.10 pounds
342 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
 0.04 kg / 0.09 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
253 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
193 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
150 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a neodymium and metal setup. The connection of two magnets creates a more powerful interaction and a larger range of performance. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still large.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Important: Calculations apply to friction force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MP 20x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.5 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Mechanical watch 20 Gs (2.0 mT) 9.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field poses a large risk to IT equipment as well as pacemakers. These NdFeB products generate a flux that destroys function of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MP 20x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.62 km/h
(7.12 m/s)
 0.22 J
30 mm 42.41 km/h
(11.78 m/s)
 0.61 J
50 mm 54.70 km/h
(15.19 m/s)
 1.02 J
100 mm 77.35 km/h
(21.49 m/s)
 2.04 J
NdFeB products are prone to chipping – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MP 20x10x5 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MP 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 116 Mx 161.2 µWb
Pc Coefficient 1.13 High (Stable)
Flux value emitted by the pole surface. Essential parameter for generator designers and motors. Pc value defines the working geometry.

Table 11: Submerged application
MP 20x10x5 / N38

Environment Effective steel pull Effect
Air (land) 5.20 kg Standard
Water (riverbed) 5.95 kg
(+0.75 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Temperature resistance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.13

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.

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: 030184-2026
Magnet Unit Converter
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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. 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 20x10x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. The flat screw head should evenly press the magnet. 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. Damage to the protective layer during assembly is the most common cause of rusting. 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. 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.
This model is characterized by dimensions Ø20x5 mm and a weight of 8.84 g. The pulling force of this model is an impressive 5.20 kg, which translates to 50.97 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 10 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of neodymium magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain full power for almost ten years – the loss is just ~1% (according to analyses),
  • Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in designing and the capacity to adapt to client solutions,
  • Fundamental importance in modern industrial fields – they serve a role in computer drives, drive modules, medical devices, and modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of making nuts in the magnet and complex shapes - preferred is cover - mounting mechanism.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

The load parameter shown represents the peak performance, obtained under optimal environment, meaning:
  • using a plate made of mild steel, serving as a magnetic yoke
  • with a cross-section no less than 10 mm
  • with a surface perfectly flat
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

Bear in mind that the application force may be lower depending on elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Steel type – mild steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
  • Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Respect the power

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Shattering risk

Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Do not overheat magnets

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Mechanical processing

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Implant safety

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Allergic reactions

Some people have a sensitization to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in an allergic reaction. We strongly advise use safety gloves.

Threat to electronics

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Magnetic interference

GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Danger to the youngest

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.

Crushing force

Big blocks can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Attention! Details about hazards in the article: Magnet Safety Guide.