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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

see technical data »

4.50 ZŁ with VAT / pcs + price for transport

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Technical specification of the product - 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

Engineering analysis of the product - technical parameters

The following data are the outcome of a mathematical analysis. Values were calculated on models for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - 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 LBS
5200.0 g / 51.0 N
 strong
1 mm 5321 Gs
532.1 mT
 4.21 kg / 9.27 LBS
4205.9 g / 41.3 N
 strong
2 mm 4736 Gs
473.6 mT
 3.33 kg / 7.35 LBS
3332.2 g / 32.7 N
 strong
3 mm 4184 Gs
418.4 mT
 2.60 kg / 5.73 LBS
2600.0 g / 25.5 N
 strong
5 mm 3216 Gs
321.6 mT
 1.54 kg / 3.39 LBS
1536.2 g / 15.1 N
 low risk
10 mm 1650 Gs
165.0 mT
 0.40 kg / 0.89 LBS
404.2 g / 4.0 N
 low risk
15 mm 907 Gs
90.7 mT
 0.12 kg / 0.27 LBS
122.3 g / 1.2 N
 low risk
20 mm 544 Gs
54.4 mT
 0.04 kg / 0.10 LBS
44.0 g / 0.4 N
 low risk
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.02 LBS
8.5 g / 0.1 N
 low risk
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 LBS
0.8 g / 0.0 N
 low risk
Pulling power drops drastically with every mm of spacing. Remember that even a microscopic distance (e.g., contamination, paint, rust) strongly weakens the grip. Neodymiums operate strongest during direct contact; air break weakens the force. Notice how quickly the load capacity plummet, when the magnet does not touch tightly to the steel surface. When planning the assembly, eliminate redundant distances.

Table 2: Vertical capacity (vertical surface)
MP 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.04 kg / 2.29 LBS
1040.0 g / 10.2 N
1 mm Stal (~0.2) 0.84 kg / 1.86 LBS
842.0 g / 8.3 N
2 mm Stal (~0.2) 0.67 kg / 1.47 LBS
666.0 g / 6.5 N
3 mm Stal (~0.2) 0.52 kg / 1.15 LBS
520.0 g / 5.1 N
5 mm Stal (~0.2) 0.31 kg / 0.68 LBS
308.0 g / 3.0 N
10 mm Stal (~0.2) 0.08 kg / 0.18 LBS
80.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section calculates the theoretical weight limit necessary to start the shifting of the magnet vertically against a upright steel wall (considering typical friction coefficient). This value depends on the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - 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 LBS
1560.0 g / 15.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.04 kg / 2.29 LBS
1040.0 g / 10.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.52 kg / 1.15 LBS
520.0 g / 5.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.60 kg / 5.73 LBS
2600.0 g / 25.5 N
When mounting a holder on a upright surface (e.g., a fridge), it will maintain only about 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that magnets slip easier than they detach. Planning a hanger? Note that the shear force is much weaker than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter weight. Using a rubber pad can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MP 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.52 kg / 1.15 LBS
520.0 g / 5.1 N
1 mm
25%
 1.30 kg / 2.87 LBS
1300.0 g / 12.8 N
2 mm
50%
 2.60 kg / 5.73 LBS
2600.0 g / 25.5 N
3 mm
75%
 3.90 kg / 8.60 LBS
3900.0 g / 38.3 N
5 mm
100%
 5.20 kg / 11.46 LBS
5200.0 g / 51.0 N
10 mm
100%
 5.20 kg / 11.46 LBS
5200.0 g / 51.0 N
11 mm
100%
 5.20 kg / 11.46 LBS
5200.0 g / 51.0 N
12 mm
100%
 5.20 kg / 11.46 LBS
5200.0 g / 51.0 N
A too thin steel cannot absorb the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To utilize the maximum of this magnet's power, you need a suitably thick piece of metal. The material oversaturation means that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - 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 LBS
5200.0 g / 51.0 N
 OK
40 °C -2.2% 5.09 kg / 11.21 LBS
5085.6 g / 49.9 N
 OK
60 °C -4.4% 4.97 kg / 10.96 LBS
4971.2 g / 48.8 N
 OK
80 °C -6.6% 4.86 kg / 10.71 LBS
4856.8 g / 47.6 N
100 °C -28.8% 3.70 kg / 8.16 LBS
3702.4 g / 36.3 N
Classic neodymiums lose strength past the thermal threshold. Watch out for overheating – excessive heat can permanently destroy this magnet. With every degree above norm, the magnet's capacity temporarily lowers. Avoid using this magnet in hot environments higher than its safe range. Exceeding the critical threshold will cause irreversible degradation of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.03 kg / 119.11 LBS
6 121 Gs
8.10 kg / 17.87 LBS
8104 g / 79.5 N
 N/A
1 mm 48.76 kg / 107.50 LBS
11 242 Gs
7.31 kg / 16.13 LBS
7314 g / 71.8 N
 43.89 kg / 96.75 LBS
~0 Gs
2 mm 43.70 kg / 96.34 LBS
10 642 Gs
6.55 kg / 14.45 LBS
6555 g / 64.3 N
 39.33 kg / 86.71 LBS
~0 Gs
3 mm 38.98 kg / 85.94 LBS
10 051 Gs
5.85 kg / 12.89 LBS
5847 g / 57.4 N
 35.08 kg / 77.34 LBS
~0 Gs
5 mm 30.63 kg / 67.54 LBS
8 910 Gs
4.60 kg / 10.13 LBS
4595 g / 45.1 N
 27.57 kg / 60.78 LBS
~0 Gs
10 mm 15.96 kg / 35.19 LBS
6 432 Gs
2.39 kg / 5.28 LBS
2394 g / 23.5 N
 14.36 kg / 31.67 LBS
~0 Gs
20 mm 4.20 kg / 9.26 LBS
3 299 Gs
0.63 kg / 1.39 LBS
630 g / 6.2 N
 3.78 kg / 8.33 LBS
~0 Gs
50 mm 0.19 kg / 0.42 LBS
702 Gs
0.03 kg / 0.06 LBS
29 g / 0.3 N
 0.17 kg / 0.38 LBS
~0 Gs
60 mm 0.09 kg / 0.20 LBS
480 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.18 LBS
~0 Gs
70 mm 0.05 kg / 0.10 LBS
342 Gs
0.01 kg / 0.01 LBS
7 g / 0.1 N
 0.04 kg / 0.09 LBS
~0 Gs
80 mm 0.02 kg / 0.05 LBS
253 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
90 mm 0.01 kg / 0.03 LBS
193 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
100 mm 0.01 kg / 0.02 LBS
150 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets attract each other from a significantly greater distance than a magnet and steel setup. Such a system of two magnets generates a stronger field and a wider radius of operation. Planning to create a strong closure? Apply two magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is extreme. The levitation is slightly lower than the connection force, but still impressive.
*Field value for N-N configuration drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Calculations demonstrate friction force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 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
A strong magnetic field poses a large risk to IT equipment as well as medical implants. These magnets generate a flux that disrupts operation of sensitive medical devices. Notice: the unseen radiation acts through matter and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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
Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or injury to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Corrosion resistance
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. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 16 116 Mx 161.2 µWb
Pc Coefficient 1.13 High (Stable)
Total magnetic flux passing through the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Vertical hold

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

2. Plate thickness effect

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

3. Thermal stability

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

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

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

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
Elemental analysis
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
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The ring-shaped magnet MP 20x10x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. 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. 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 does not ensure full waterproofing. 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.
A screw or bolt with a thread diameter smaller than 10 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 5 mm. The key parameter here is the lifting capacity amounting to approximately 5.20 kg (force ~50.97 N). 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are extremely resistant to demagnetization caused by external magnetic fields,
  • By covering with a reflective layer of gold, the element gains an elegant look,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • 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 modularity in designing and the ability to customize to individual projects,
  • Versatile presence in modern technologies – they serve a role in data components, brushless drives, medical equipment, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these products can be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

Information about lifting capacity was defined for ideal contact conditions, taking into account:
  • using a base made of high-permeability steel, functioning as a circuit closing element
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • without any clearance 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

It is worth knowing that the working load will differ influenced by elements below, in order of importance:
  • Distance (between the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be lost into the air.
  • Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the load capacity.

Safe handling of NdFeB magnets
Data carriers

Do not bring magnets near a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Fire warning

Dust generated during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

No play value

Always keep magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are tragic.

Pinching danger

Pinching hazard: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Do not overheat magnets

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Magnet fragility

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them shattering into shards.

Magnetic interference

Note: rare earth magnets generate a field that disrupts precision electronics. Maintain a separation from your mobile, tablet, and GPS.

Danger to pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Caution required

Exercise caution. Neodymium magnets act from a long distance and snap with massive power, often quicker than you can move away.

Skin irritation risks

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, immediately stop handling magnets and wear gloves.

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?