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MP 20x5x27 / N38 - ring magnet

ring magnet

Catalog no 030185

GTIN/EAN: 5906301812029

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

Height

27 mm [±0,1 mm]

Weight

59.64 g

Magnetization Direction

↑ axial

Load capacity

10.36 kg / 101.60 N

Magnetic Induction

581.04 mT / 5810 Gs

Coating

[NiCuNi] Nickel

see parameters »

33.00 ZŁ with VAT / pcs + price for transport

26.83 ZŁ net + 23% VAT / pcs

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Lifting power as well as form of magnetic components can be tested with our our magnetic calculator.

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

Technical parameters - MP 20x5x27 / N38 - ring magnet

Specification / characteristics - MP 20x5x27 / N38 - ring magnet

properties
properties values
Cat. no. 030185
GTIN/EAN 5906301812029
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 5 mm [±0,1 mm]
Height 27 mm [±0,1 mm]
Weight 59.64 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.36 kg / 101.60 N
Magnetic Induction ~ ? 581.04 mT / 5810 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x5x27 / 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 assembly - technical parameters

These data represent the direct effect of a engineering calculation. Values rely on models for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these data as a reference point for designers.

Table 1: Static force (pull vs distance) - power drop
MP 20x5x27 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5716 Gs
571.6 mT
 10.36 kg / 22.84 LBS
10360.0 g / 101.6 N
 dangerous!
1 mm 5288 Gs
528.8 mT
 8.87 kg / 19.55 LBS
8865.5 g / 87.0 N
 medium risk
2 mm 4861 Gs
486.1 mT
 7.49 kg / 16.51 LBS
7491.0 g / 73.5 N
 medium risk
3 mm 4446 Gs
444.6 mT
 6.27 kg / 13.82 LBS
6267.5 g / 61.5 N
 medium risk
5 mm 3677 Gs
367.7 mT
 4.29 kg / 9.45 LBS
4285.9 g / 42.0 N
 medium risk
10 mm 2216 Gs
221.6 mT
 1.56 kg / 3.43 LBS
1557.1 g / 15.3 N
 safe
15 mm 1354 Gs
135.4 mT
 0.58 kg / 1.28 LBS
580.9 g / 5.7 N
 safe
20 mm 864 Gs
86.4 mT
 0.24 kg / 0.52 LBS
236.9 g / 2.3 N
 safe
30 mm 405 Gs
40.5 mT
 0.05 kg / 0.11 LBS
52.1 g / 0.5 N
 safe
50 mm 133 Gs
13.3 mT
 0.01 kg / 0.01 LBS
5.6 g / 0.1 N
 safe
Pulling power drops drastically with every subsequent millimeter of spacing. Keep in mind that even a very thin break (e.g., contamination, paint, veneer) significantly reduces the pull force. Magnets work strongest in perfect adhesion; air break weakens the force. See how flashily the load capacity drop, when the product does not adhere directly to the steel surface. When designing the mounting, avoid unnecessary gaps.

Table 2: Slippage hold (vertical surface)
MP 20x5x27 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.07 kg / 4.57 LBS
2072.0 g / 20.3 N
1 mm Stal (~0.2) 1.77 kg / 3.91 LBS
1774.0 g / 17.4 N
2 mm Stal (~0.2) 1.50 kg / 3.30 LBS
1498.0 g / 14.7 N
3 mm Stal (~0.2) 1.25 kg / 2.76 LBS
1254.0 g / 12.3 N
5 mm Stal (~0.2) 0.86 kg / 1.89 LBS
858.0 g / 8.4 N
10 mm Stal (~0.2) 0.31 kg / 0.69 LBS
312.0 g / 3.1 N
15 mm Stal (~0.2) 0.12 kg / 0.26 LBS
116.0 g / 1.1 N
20 mm Stal (~0.2) 0.05 kg / 0.11 LBS
48.0 g / 0.5 N
30 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
The table below calculates the estimated shear load necessary to cause the shifting of the magnet downwards on a vertical steel plate (assuming standard friction). The holding force depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 20x5x27 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.11 kg / 6.85 LBS
3108.0 g / 30.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.07 kg / 4.57 LBS
2072.0 g / 20.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.04 kg / 2.28 LBS
1036.0 g / 10.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.18 kg / 11.42 LBS
5180.0 g / 50.8 N
When mounting a element on a upright plane (e.g., a fridge), it will only hold just approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip mean that products slide down easier than they pull off. Planning a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller weight. Utilizing a rubberized pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 20x5x27 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.52 kg / 1.14 LBS
518.0 g / 5.1 N
1 mm
13%
 1.30 kg / 2.85 LBS
1295.0 g / 12.7 N
2 mm
25%
 2.59 kg / 5.71 LBS
2590.0 g / 25.4 N
3 mm
38%
 3.89 kg / 8.56 LBS
3885.0 g / 38.1 N
5 mm
63%
 6.48 kg / 14.27 LBS
6475.0 g / 63.5 N
10 mm
100%
 10.36 kg / 22.84 LBS
10360.0 g / 101.6 N
11 mm
100%
 10.36 kg / 22.84 LBS
10360.0 g / 101.6 N
12 mm
100%
 10.36 kg / 22.84 LBS
10360.0 g / 101.6 N
A thin sheet is not enough to take in the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To squeeze full efficiency of this magnet's power, you need a suitably thick backing of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the product shows lower pull force. We advise picking the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - resistance threshold
MP 20x5x27 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.36 kg / 22.84 LBS
10360.0 g / 101.6 N
 OK
40 °C -2.2% 10.13 kg / 22.34 LBS
10132.1 g / 99.4 N
 OK
60 °C -4.4% 9.90 kg / 21.83 LBS
9904.2 g / 97.2 N
 OK
80 °C -6.6% 9.68 kg / 21.33 LBS
9676.2 g / 94.9 N
100 °C -28.8% 7.38 kg / 16.26 LBS
7376.3 g / 72.4 N
Ordinary NdFeB products irreversibly lose parameters past the thermal threshold. Watch out for overheating – heat can irreversibly destroy this product. With every degree above norm, the neodymium's force momentarily lowers. Do not use this product in hot environments higher than its working range. Exceeding the critical threshold will lead to irreversible degradation of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 20x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 44.24 kg / 97.54 LBS
6 064 Gs
6.64 kg / 14.63 LBS
6636 g / 65.1 N
 N/A
1 mm 41.02 kg / 90.43 LBS
11 008 Gs
6.15 kg / 13.56 LBS
6153 g / 60.4 N
 36.92 kg / 81.39 LBS
~0 Gs
2 mm 37.86 kg / 83.47 LBS
10 576 Gs
5.68 kg / 12.52 LBS
5679 g / 55.7 N
 34.07 kg / 75.12 LBS
~0 Gs
3 mm 34.85 kg / 76.83 LBS
10 146 Gs
5.23 kg / 11.52 LBS
5227 g / 51.3 N
 31.36 kg / 69.14 LBS
~0 Gs
5 mm 29.30 kg / 64.58 LBS
9 303 Gs
4.39 kg / 9.69 LBS
4394 g / 43.1 N
 26.37 kg / 58.13 LBS
~0 Gs
10 mm 18.30 kg / 40.35 LBS
7 353 Gs
2.75 kg / 6.05 LBS
2745 g / 26.9 N
 16.47 kg / 36.32 LBS
~0 Gs
20 mm 6.65 kg / 14.66 LBS
4 432 Gs
1.00 kg / 2.20 LBS
997 g / 9.8 N
 5.98 kg / 13.19 LBS
~0 Gs
50 mm 0.45 kg / 1.00 LBS
1 159 Gs
0.07 kg / 0.15 LBS
68 g / 0.7 N
 0.41 kg / 0.90 LBS
~0 Gs
60 mm 0.22 kg / 0.49 LBS
811 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.44 LBS
~0 Gs
70 mm 0.12 kg / 0.26 LBS
589 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
 0.11 kg / 0.23 LBS
~0 Gs
80 mm 0.07 kg / 0.14 LBS
440 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.13 LBS
~0 Gs
90 mm 0.04 kg / 0.09 LBS
338 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.03 kg / 0.08 LBS
~0 Gs
100 mm 0.02 kg / 0.05 LBS
265 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
Two magnets attract each other from a wider radius than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of operation. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Note: Results show friction force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MP 20x5x27 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 18.0 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Timepiece 20 Gs (2.0 mT) 11.0 cm
Mobile device 40 Gs (4.0 mT) 8.5 cm
Remote 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Powerful magnet radiation poses a real danger to electronics and medical implants. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field acts through matter and housings. Increased vigilance must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MP 20x5x27 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 14.49 km/h
(4.02 m/s)
 0.48 J
30 mm 23.09 km/h
(6.42 m/s)
 1.23 J
50 mm 29.73 km/h
(8.26 m/s)
 2.03 J
100 mm 42.03 km/h
(11.68 m/s)
 4.07 J
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 20x5x27 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MP 20x5x27 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 314 Mx 143.1 µWb
Pc Coefficient 1.16 High (Stable)
Flux value emitted by the pole surface. Key data in coil applications and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 20x5x27 / N38

Environment Effective steel pull Effect
Air (land) 10.36 kg Standard
Water (riverbed) 11.86 kg
(+1.50 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Caution: On a vertical surface, the magnet retains merely a fraction of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.16

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
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%
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: 030185-2026
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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. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a rubber spacer 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 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. 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.
The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 27 mm. The key parameter here is the lifting capacity amounting to approximately 10.36 kg (force ~101.60 N). The mounting hole diameter is precisely 5 mm.
The poles are located on the planes with holes, not on the sides of the ring. 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.

Strengths as well as weaknesses of neodymium magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after approximately 10 years it drops only by ~1% (theoretically),
  • They show high resistance to demagnetization induced by external disturbances,
  • A magnet with a metallic gold surface looks better,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Considering the option of accurate forming and customization to specialized projects, magnetic components can be modeled in a wide range of geometric configurations, which makes them more universal,
  • Huge importance in innovative solutions – they are utilized in mass storage devices, motor assemblies, diagnostic systems, as well as other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 extremely resistant to heat
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - magnetic mount.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Additionally, small components of these devices can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Highest magnetic holding force – what contributes to it?

The lifting capacity listed is a theoretical maximum value executed under standard conditions:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • whose thickness is min. 10 mm
  • with a plane free of scratches
  • with total lack of distance (without coatings)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Bear in mind that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be lost into the air.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and holding force.
  • Surface quality – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Dust explosion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Metal Allergy

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, refrain from direct skin contact and opt for coated magnets.

Choking Hazard

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Store away from kids and pets.

Impact on smartphones

Navigation devices and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Safe distance

Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Maximum temperature

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Safe operation

Exercise caution. Rare earth magnets attract from a distance and snap with huge force, often faster than you can react.

Crushing risk

Big blocks can break fingers instantly. Do not place your hand between two attracting surfaces.

Beware of splinters

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Implant safety

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Danger! Want to know more? Check our post: Why are neodymium magnets dangerous?