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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

4.50 with VAT / pcs + price for transport

3.66 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Physical modeling of the assembly - data

Presented data represent the outcome of a physical analysis. Values rely on models for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
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 pounds
5200.0 g / 51.0 N
medium risk
1 mm 5321 Gs
532.1 mT
4.21 kg / 9.27 pounds
4205.9 g / 41.3 N
medium risk
2 mm 4736 Gs
473.6 mT
3.33 kg / 7.35 pounds
3332.2 g / 32.7 N
medium risk
3 mm 4184 Gs
418.4 mT
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
medium risk
5 mm 3216 Gs
321.6 mT
1.54 kg / 3.39 pounds
1536.2 g / 15.1 N
safe
10 mm 1650 Gs
165.0 mT
0.40 kg / 0.89 pounds
404.2 g / 4.0 N
safe
15 mm 907 Gs
90.7 mT
0.12 kg / 0.27 pounds
122.3 g / 1.2 N
safe
20 mm 544 Gs
54.4 mT
0.04 kg / 0.10 pounds
44.0 g / 0.4 N
safe
30 mm 240 Gs
24.0 mT
0.01 kg / 0.02 pounds
8.5 g / 0.1 N
safe
50 mm 75 Gs
7.5 mT
0.00 kg / 0.00 pounds
0.8 g / 0.0 N
safe

Table 2: Shear force (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 pounds
1040.0 g / 10.2 N
1 mm Stal (~0.2) 0.84 kg / 1.86 pounds
842.0 g / 8.3 N
2 mm Stal (~0.2) 0.67 kg / 1.47 pounds
666.0 g / 6.5 N
3 mm Stal (~0.2) 0.52 kg / 1.15 pounds
520.0 g / 5.1 N
5 mm Stal (~0.2) 0.31 kg / 0.68 pounds
308.0 g / 3.0 N
10 mm Stal (~0.2) 0.08 kg / 0.18 pounds
80.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - 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 pounds
1560.0 g / 15.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.04 kg / 2.29 pounds
1040.0 g / 10.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.52 kg / 1.15 pounds
520.0 g / 5.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N

Table 4: Material efficiency (substrate influence) - 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 pounds
520.0 g / 5.1 N
1 mm
25%
1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
2 mm
50%
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
3 mm
75%
3.90 kg / 8.60 pounds
3900.0 g / 38.3 N
5 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
10 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
11 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
12 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N

Table 5: Working in heat (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 pounds
5200.0 g / 51.0 N
OK
40 °C -2.2% 5.09 kg / 11.21 pounds
5085.6 g / 49.9 N
OK
60 °C -4.4% 4.97 kg / 10.96 pounds
4971.2 g / 48.8 N
OK
80 °C -6.6% 4.86 kg / 10.71 pounds
4856.8 g / 47.6 N
100 °C -28.8% 3.70 kg / 8.16 pounds
3702.4 g / 36.3 N

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.03 kg / 119.11 pounds
6 121 Gs
8.10 kg / 17.87 pounds
8104 g / 79.5 N
N/A
1 mm 48.76 kg / 107.50 pounds
11 242 Gs
7.31 kg / 16.13 pounds
7314 g / 71.8 N
43.89 kg / 96.75 pounds
~0 Gs
2 mm 43.70 kg / 96.34 pounds
10 642 Gs
6.55 kg / 14.45 pounds
6555 g / 64.3 N
39.33 kg / 86.71 pounds
~0 Gs
3 mm 38.98 kg / 85.94 pounds
10 051 Gs
5.85 kg / 12.89 pounds
5847 g / 57.4 N
35.08 kg / 77.34 pounds
~0 Gs
5 mm 30.63 kg / 67.54 pounds
8 910 Gs
4.60 kg / 10.13 pounds
4595 g / 45.1 N
27.57 kg / 60.78 pounds
~0 Gs
10 mm 15.96 kg / 35.19 pounds
6 432 Gs
2.39 kg / 5.28 pounds
2394 g / 23.5 N
14.36 kg / 31.67 pounds
~0 Gs
20 mm 4.20 kg / 9.26 pounds
3 299 Gs
0.63 kg / 1.39 pounds
630 g / 6.2 N
3.78 kg / 8.33 pounds
~0 Gs
50 mm 0.19 kg / 0.42 pounds
702 Gs
0.03 kg / 0.06 pounds
29 g / 0.3 N
0.17 kg / 0.38 pounds
~0 Gs
60 mm 0.09 kg / 0.20 pounds
480 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.18 pounds
~0 Gs
70 mm 0.05 kg / 0.10 pounds
342 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
253 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
193 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.03 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
150 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - 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
Timepiece 20 Gs (2.0 mT) 9.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 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

Table 8: Impact energy (kinetic energy) - 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

Table 9: Surface protection spec
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)

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)

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!
1. Shear force

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

2. Plate thickness effect

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

3. Heat tolerance

*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

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
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%
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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Magnet pull force

Magnetic Field

Other offers

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 quick installation to wood, wall, plastic, or metal. This product with a force of 5.20 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 20x10x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. 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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. 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 key parameter here is the holding force 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.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths and weaknesses of rare earth magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
  • In other words, due to the glossy finish of gold, the element gains visual value,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in constructing and the capacity to adapt to specific needs,
  • Wide application in modern technologies – they are utilized in mass storage devices, motor assemblies, medical equipment, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating nuts in the magnet and complex forms - preferred is cover - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Lifting parameters

Maximum magnetic pulling forcewhat contributes to it?

The force parameter is a theoretical maximum value performed under specific, ideal conditions:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • with an polished contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Key elements affecting lifting force

During everyday use, the real power results from several key aspects, ranked from crucial:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick steel does not close the flux, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.

Warnings
Fragile material

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them breaking into shards.

Heat warning

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

ICD Warning

People with a pacemaker must keep an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease handling magnets and wear gloves.

Fire warning

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Pinching danger

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

GPS and phone interference

An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Keep away from computers

Data protection: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

This is not a toy

Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store away from children and animals.

Handling rules

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Important! Learn more about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98