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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

technical parameters »

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Technical parameters of the product - 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 product - report

These data constitute the outcome of a engineering analysis. Results are based on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
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
 low risk
15 mm 1354 Gs
135.4 mT
 0.58 kg / 1.28 LBS
580.9 g / 5.7 N
 low risk
20 mm 864 Gs
86.4 mT
 0.24 kg / 0.52 LBS
236.9 g / 2.3 N
 low risk
30 mm 405 Gs
40.5 mT
 0.05 kg / 0.11 LBS
52.1 g / 0.5 N
 low risk
50 mm 133 Gs
13.3 mT
 0.01 kg / 0.01 LBS
5.6 g / 0.1 N
 low risk
Magnetic force decreases significantly with every mm of spacing. Note that even a microscopic distance (e.g., dirt, paint, rust) noticeably reduces the pull force. Neodymiums hold strongest during direct contact; distance kills the power. See how flashily the pull force drop, when the product does not touch tightly to the metal substrate. When designing the assembly, avoid additional spacers.

Table 2: Sliding force (wall)
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 indicates the approximate force needed to start the downward movement of the magnet down along a vertical metal surface (assuming typical friction coefficient). This value is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
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 hanging a magnet on a upright plane (e.g., a fridge), it you can count on barely about 1/5 of its maximum pull force. Gravity as well as a low friction coefficient cause that holders slip faster than they pull off. Designing a vertical fastening? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the element will slide down under a significantly smaller load. Using a rubber layer can drastically improve the result.

Table 4: Steel thickness (saturation) - 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 unable to focus the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize the maximum of this neodymium's power, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the product holds weaker. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (stability) - thermal limit
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 change their properties parameters past the thermal threshold. Protect against heat – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's power temporarily drops. Do not use this product close to ovens exceeding its working range. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 20x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnetic products interact from a significantly greater distance than a magnet and sheet setup. The connection of magnet-to-magnet produces a massive flux and a larger range of action. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is extreme. The levitation is slightly lower than the connection force, but still large.
*Flux density for N-N configuration reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Figures show shear force of two identical magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (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
Mechanical watch 20 Gs (2.0 mT) 11.0 cm
Phone / Smartphone 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
A strong magnetic field poses a large risk to electronic devices as well as pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (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
NdFeB products are very brittle – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. 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 metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MP 20x5x27 / N38

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

Table 11: Submerged application
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains just a fraction of its max power.

2. Plate thickness effect

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

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

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.

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%
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: 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. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 10.36 kg works great as a door latch, speaker holder, or spacer element in devices.
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 flexible washer under the screw head, which will cushion the stresses. 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 is not sufficient for rain. 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 inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 5 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths and weaknesses of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly 10 years – the drop is just ~1% (in theory),
  • They retain their magnetic properties even under external field action,
  • In other words, due to the metallic surface of silver, the element looks attractive,
  • Neodymium magnets ensure maximum magnetic induction on a small surface, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the ability of free forming and adaptation to individualized needs, NdFeB magnets can be created in a broad palette of geometric configurations, which amplifies use scope,
  • Versatile presence in modern technologies – they are used in computer drives, electric drive systems, advanced medical instruments, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Limitations

Drawbacks and weaknesses of neodymium magnets: application proposals
  • 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 weakening of strength (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
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Highest magnetic holding force – what affects it?

Holding force of 10.36 kg is a result of laboratory testing performed under the following configuration:
  • on a block made of structural steel, optimally conducting the magnetic field
  • whose thickness is min. 10 mm
  • with an ground touching surface
  • with direct contact (without impurities)
  • during detachment in a direction perpendicular to the plane
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Holding efficiency impacted by specific conditions, including (from most important):
  • Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be lost to the other side.
  • Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Thermal environment – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safe handling of NdFeB magnets
Magnetic media

Equipment safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

Crushing risk

Risk of injury: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Adults only

Absolutely store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are life-threatening.

Risk of cracking

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Health Danger

Warning for patients: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to handle the magnets.

Safe operation

Exercise caution. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can react.

Machining danger

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Operating temperature

Control the heat. Heating the magnet to high heat will destroy its properties and pulling force.

Sensitization to coating

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop handling magnets and use protective gear.

Threat to navigation

Navigation devices and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.

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