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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 properties »

33.00 ZŁ with VAT / pcs + price for transport

26.83 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Technical simulation of the assembly - report

These data represent the result of a mathematical simulation. Results are based on algorithms for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
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
 critical level
1 mm 5288 Gs
528.8 mT
 8.87 kg / 19.55 LBS
8865.5 g / 87.0 N
 warning
2 mm 4861 Gs
486.1 mT
 7.49 kg / 16.51 LBS
7491.0 g / 73.5 N
 warning
3 mm 4446 Gs
444.6 mT
 6.27 kg / 13.82 LBS
6267.5 g / 61.5 N
 warning
5 mm 3677 Gs
367.7 mT
 4.29 kg / 9.45 LBS
4285.9 g / 42.0 N
 warning
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
Grip strength decreases sharply per each millimeter of gap. Remember that even a very thin break (e.g., dirt, paint, veneer) strongly reduces the pull force. Neodymiums work strongest during direct contact; air break nullifies the power. Analyze how quickly the load capacity fall, when the product does not touch flatly to the steel surface. When planning the arrangement, avoid unnecessary gaps.

Table 2: Shear load (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 following data calculates the approximate weight limit required to initiate the shifting of the magnet down on a upright metal surface (considering typical friction coefficient). The holding force varies with the distance 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 hanging a holder on a upright wall (e.g., a car body), it you can count on just approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip cause that products move down easier than they pull off. Planning a vertical fastening? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a noticeably lighter cargo. Utilizing a rubberized coating can drastically raise the stability.

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 take in the entire magnetic field, which wastes potential of the holder. Should you attach a powerful product to a too thin substrate, the field will penetrate right through and the pull force will drop sharply. To utilize full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the magnet works worse. We advise picking the steel cross-section from these parameters.

Table 5: Working in heat (material behavior) - 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
Standard neodymium magnets lose power above the temperature limit. Protect against heat – excessive heat can permanently destroy this magnet. As the temperature rises, the neodymium's force briefly drops. Refrain from using this product in hot environments higher than its safe range. Ignoring the limit will lead to permanent loss of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 significantly greater distance than a magnet and steel setup. Such a system of magnet-to-magnet generates a stronger field and a wider radius of performance. Designing a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is marginally weaker than the attraction, but still large.
*The magnetic induction for N-N configuration reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Calculations refer to shear force of two matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - 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
Powerful magnet radiation is a serious hazard to electronics and medical implants. These magnets generate a field that destroys function of digital equipment. Notice: the unseen radiation acts through matter and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: 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) - 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
Magnetic elements are very brittle – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or injury to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when handling 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)
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 (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 pole surface. Essential parameter for generator designers and motors. Pc value determines the magnet's operating point.

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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Heat tolerance

*For N38 grade, 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

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 and environmental data
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%
Sustainability
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
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. 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. 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. 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 is not sufficient for rain. 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. 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 5 mm fits this model. 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.
It is a magnetic ring with a diameter of 20 mm and thickness 27 mm. The pulling force of this model is an impressive 10.36 kg, which translates to 101.60 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 5 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • They do not lose strength, even during approximately 10 years – the decrease in lifting capacity is only ~1% (theoretically),
  • Neodymium magnets are exceptionally resistant to demagnetization caused by external magnetic fields,
  • In other words, due to the glossy finish of gold, the element looks attractive,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Considering the possibility of flexible forming and adaptation to unique requirements, NdFeB magnets can be created in a broad palette of geometric configurations, which increases their versatility,
  • Wide application in future technologies – they are used in data components, drive modules, advanced medical instruments, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing nuts and complicated forms in magnets, we recommend using casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:
  • on a block made of mild steel, perfectly concentrating the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • characterized by even structure
  • with total lack of distance (no paint)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Lifting capacity in real conditions – factors

It is worth knowing that the magnet holding will differ subject to elements below, starting with the most relevant:
  • Air gap (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Surface condition – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Power loss in heat

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Keep away from children

Always store magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are tragic.

Compass and GPS

Be aware: rare earth magnets generate a field that disrupts sensitive sensors. Keep a safe distance from your phone, tablet, and GPS.

Fire risk

Dust created during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Conscious usage

Be careful. Neodymium magnets attract from a distance and snap with massive power, often faster than you can move away.

Material brittleness

Neodymium magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.

Electronic devices

Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Bodily injuries

Risk of injury: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Warning for allergy sufferers

Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, avoid direct skin contact and choose coated magnets.

ICD Warning

People with a heart stimulator must keep an safe separation from magnets. The magnetic field can stop the operation of the life-saving device.

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