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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

view properties »

4.50 ZŁ with VAT / pcs + price for transport

3.66 ZŁ net + 23% VAT / pcs

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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 simulation of the product - data

These values represent the result of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Use these calculations as a supplementary guide for designers.

Table 1: Static 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
 medium risk
1 mm 5321 Gs
532.1 mT
 4.21 kg / 9.27 lbs
4205.9 g / 41.3 N
 medium risk
2 mm 4736 Gs
473.6 mT
 3.33 kg / 7.35 lbs
3332.2 g / 32.7 N
 medium risk
3 mm 4184 Gs
418.4 mT
 2.60 kg / 5.73 lbs
2600.0 g / 25.5 N
 medium risk
5 mm 3216 Gs
321.6 mT
 1.54 kg / 3.39 lbs
1536.2 g / 15.1 N
 weak grip
10 mm 1650 Gs
165.0 mT
 0.40 kg / 0.89 lbs
404.2 g / 4.0 N
 weak grip
15 mm 907 Gs
90.7 mT
 0.12 kg / 0.27 lbs
122.3 g / 1.2 N
 weak grip
20 mm 544 Gs
54.4 mT
 0.04 kg / 0.10 lbs
44.0 g / 0.4 N
 weak grip
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.02 lbs
8.5 g / 0.1 N
 weak grip
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 lbs
0.8 g / 0.0 N
 weak grip
Magnetic force decreases sharply with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., contamination, paint, dust) noticeably weakens the grip. Magnetic products work most effectively in perfect adhesion; distance weakens the force. Observe how quickly the pull force fall, when the magnet does not adhere tightly to the metal substrate. When planning the mounting, discard unnecessary gaps.

Table 2: Slippage load (wall)
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
The table below calculates the approximate holding capacity necessary to cause the shifting of the magnet downwards along a vertical steel wall (considering standard friction). This parameter varies with the separation distance 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 element on a upright surface (e.g., a fridge), it will maintain just approx. 1/5 of its nominal power. Gravity and a low friction coefficient mean that holders slide down faster than they pop off the substrate. Planning a wall mount? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a much lighter cargo. Utilizing a rubberized pad can significantly raise the stability.

Table 4: Material efficiency (saturation) - 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 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 is not enough to absorb the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid piece of metal. The saturation effect causes that on thin elements (e.g., thin profiles), the magnet works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (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 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 irreversibly lose strength past the thermal threshold. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. With every degree above norm, the neodymium's power temporarily lowers. Avoid using this magnet close to ovens higher than its working range. Too high temperature will lead to destruction of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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 strong neodymiums attract each other from a significantly greater distance than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a larger range of action. Planning to create a solid fastener? Apply two magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the impact force is huge. The repulsion force is slightly lower than the connection force, but still significant.
*Field value in repulsion mode reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Attention: Estimates demonstrate friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

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
Mobile device 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
Extremely neodym field poses a serious hazard to electronic devices as well as medical implants. These NdFeB products produce a field that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
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 very brittle – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during mounting 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 working with large magnets.

Table 9: Anti-corrosion coating 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)
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: Electrical data (Flux)
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. Key data in coil applications as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

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

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Thermal stability

*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) = 1.13

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
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: 030184-2026
Measurement Calculator
Pulling force
Magnetic Induction
Input a number in one of the inputs, to see the remaining fields convert on the fly.

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The ring magnet with a hole MP 20x10x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 5.20 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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. 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 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 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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 5.20 kg, which translates to 50.97 N in newtons. The mounting hole diameter is precisely 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 as well as disadvantages of rare earth magnets.

Strengths

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They maintain their magnetic properties even under close interference source,
  • Thanks to the smooth finish, the surface of nickel, gold-plated, or silver-plated gives an modern appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the capacity to modify to individual projects,
  • Significant place in future technologies – they find application in magnetic memories, drive modules, advanced medical instruments, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • We suggest cover - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these devices can be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

The declared magnet strength refers to the maximum value, recorded under ideal test conditions, specifically:
  • using a sheet made of high-permeability steel, functioning as a circuit closing element
  • with a cross-section of at least 10 mm
  • characterized by even structure
  • without any insulating layer between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at room temperature

Determinants of lifting force in real conditions

In real-world applications, the actual holding force results from a number of factors, ranked from crucial:
  • Clearance – the presence of foreign body (rust, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Base massiveness – too thin steel does not close the flux, causing part of the power to be escaped into the air.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Hand protection

Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

GPS and phone interference

Remember: rare earth magnets generate a field that disrupts precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

Fragile material

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Safe operation

Use magnets consciously. Their huge power can surprise even professionals. Plan your moves and do not underestimate their power.

This is not a toy

Absolutely store magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are very dangerous.

Keep away from computers

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Warning for heart patients

Warning for patients: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Power loss in heat

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Sensitization to coating

Certain individuals have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to a rash. We strongly advise use safety gloves.

Combustion hazard

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

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