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MP 20x8x6 / N38 - ring magnet

ring magnet

Catalog no 030189

GTIN/EAN: 5906301812067

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

11.88 g

Magnetization Direction

↑ axial

Load capacity

7.22 kg / 70.81 N

Magnetic Induction

318.85 mT / 3188 Gs

Coating

[NiCuNi] Nickel

5.17 with VAT / pcs + price for transport

4.20 ZŁ net + 23% VAT / pcs

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Detailed specification - MP 20x8x6 / N38 - ring magnet

Specification / characteristics - MP 20x8x6 / N38 - ring magnet

properties
properties values
Cat. no. 030189
GTIN/EAN 5906301812067
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 8 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 11.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.22 kg / 70.81 N
Magnetic Induction ~ ? 318.85 mT / 3188 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8x6 / 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 magnet - data

Presented values represent the result of a mathematical analysis. Values are based on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Treat these data as a supplementary guide for designers.

Table 1: Static pull force (force vs distance) - interaction chart
MP 20x8x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5917 Gs
591.7 mT
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
strong
1 mm 5321 Gs
532.1 mT
5.84 kg / 12.87 pounds
5839.8 g / 57.3 N
strong
2 mm 4736 Gs
473.6 mT
4.63 kg / 10.20 pounds
4626.6 g / 45.4 N
strong
3 mm 4184 Gs
418.4 mT
3.61 kg / 7.96 pounds
3610.0 g / 35.4 N
strong
5 mm 3216 Gs
321.6 mT
2.13 kg / 4.70 pounds
2132.9 g / 20.9 N
strong
10 mm 1650 Gs
165.0 mT
0.56 kg / 1.24 pounds
561.3 g / 5.5 N
low risk
15 mm 907 Gs
90.7 mT
0.17 kg / 0.37 pounds
169.7 g / 1.7 N
low risk
20 mm 544 Gs
54.4 mT
0.06 kg / 0.13 pounds
61.1 g / 0.6 N
low risk
30 mm 240 Gs
24.0 mT
0.01 kg / 0.03 pounds
11.9 g / 0.1 N
low risk
50 mm 75 Gs
7.5 mT
0.00 kg / 0.00 pounds
1.2 g / 0.0 N
low risk

Table 2: Sliding load (wall)
MP 20x8x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.44 kg / 3.18 pounds
1444.0 g / 14.2 N
1 mm Stal (~0.2) 1.17 kg / 2.57 pounds
1168.0 g / 11.5 N
2 mm Stal (~0.2) 0.93 kg / 2.04 pounds
926.0 g / 9.1 N
3 mm Stal (~0.2) 0.72 kg / 1.59 pounds
722.0 g / 7.1 N
5 mm Stal (~0.2) 0.43 kg / 0.94 pounds
426.0 g / 4.2 N
10 mm Stal (~0.2) 0.11 kg / 0.25 pounds
112.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.07 pounds
34.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 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 (sliding) - behavior on slippery surfaces
MP 20x8x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.17 kg / 4.78 pounds
2166.0 g / 21.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.44 kg / 3.18 pounds
1444.0 g / 14.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.72 kg / 1.59 pounds
722.0 g / 7.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.61 kg / 7.96 pounds
3610.0 g / 35.4 N

Table 4: Steel thickness (saturation) - power losses
MP 20x8x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.72 kg / 1.59 pounds
722.0 g / 7.1 N
1 mm
25%
1.81 kg / 3.98 pounds
1805.0 g / 17.7 N
2 mm
50%
3.61 kg / 7.96 pounds
3610.0 g / 35.4 N
3 mm
75%
5.42 kg / 11.94 pounds
5415.0 g / 53.1 N
5 mm
100%
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
10 mm
100%
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
11 mm
100%
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
12 mm
100%
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N

Table 5: Thermal stability (material behavior) - power drop
MP 20x8x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
OK
40 °C -2.2% 7.06 kg / 15.57 pounds
7061.2 g / 69.3 N
OK
60 °C -4.4% 6.90 kg / 15.22 pounds
6902.3 g / 67.7 N
OK
80 °C -6.6% 6.74 kg / 14.87 pounds
6743.5 g / 66.2 N
100 °C -28.8% 5.14 kg / 11.33 pounds
5140.6 g / 50.4 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 20x8x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 52.44 kg / 115.62 pounds
6 121 Gs
7.87 kg / 17.34 pounds
7867 g / 77.2 N
N/A
1 mm 47.33 kg / 104.35 pounds
11 242 Gs
7.10 kg / 15.65 pounds
7100 g / 69.6 N
42.60 kg / 93.91 pounds
~0 Gs
2 mm 42.42 kg / 93.52 pounds
10 642 Gs
6.36 kg / 14.03 pounds
6363 g / 62.4 N
38.18 kg / 84.16 pounds
~0 Gs
3 mm 37.84 kg / 83.42 pounds
10 051 Gs
5.68 kg / 12.51 pounds
5675 g / 55.7 N
34.05 kg / 75.07 pounds
~0 Gs
5 mm 29.73 kg / 65.55 pounds
8 910 Gs
4.46 kg / 9.83 pounds
4460 g / 43.8 N
26.76 kg / 59.00 pounds
~0 Gs
10 mm 15.49 kg / 34.16 pounds
6 432 Gs
2.32 kg / 5.12 pounds
2324 g / 22.8 N
13.94 kg / 30.74 pounds
~0 Gs
20 mm 4.08 kg / 8.99 pounds
3 299 Gs
0.61 kg / 1.35 pounds
612 g / 6.0 N
3.67 kg / 8.09 pounds
~0 Gs
50 mm 0.18 kg / 0.41 pounds
702 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
0.17 kg / 0.37 pounds
~0 Gs
60 mm 0.09 kg / 0.19 pounds
480 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.17 pounds
~0 Gs
70 mm 0.04 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: Protective zones (electronics) - precautionary measures
MP 20x8x6 / 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
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) - collision effects
MP 20x8x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.04 km/h
(7.23 m/s)
0.31 J
30 mm 43.11 km/h
(11.97 m/s)
0.85 J
50 mm 55.60 km/h
(15.44 m/s)
1.42 J
100 mm 78.62 km/h
(21.84 m/s)
2.83 J

Table 9: Anti-corrosion coating durability
MP 20x8x6 / 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: Construction data (Flux)
MP 20x8x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 15 688 Mx 156.9 µWb
Pc Coefficient 1.14 High (Stable)

Table 11: Underwater work (magnet fishing)
MP 20x8x6 / N38

Environment Effective steel pull Effect
Air (land) 7.22 kg Standard
Water (riverbed) 8.27 kg
(+1.05 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Heat tolerance

*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) = 1.14

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%
Environmental data
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: 030189-2026
Magnet Unit Converter
Magnet pull force

Field Strength

View also products

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 7.22 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 20x8x6 / 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. 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 can be damaged 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.
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. 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.
The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 6 mm. The key parameter here is the lifting capacity amounting to approximately 7.22 kg (force ~70.81 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even over nearly ten years – the drop in power is only ~1% (based on measurements),
  • They do not lose their magnetic properties even under external field action,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of accurate creating as well as adapting to concrete applications,
  • Huge importance in modern technologies – they serve a role in HDD drives, electric drive systems, precision medical tools, also other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their 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 while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using cover - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat affects it?

The declared magnet strength concerns the maximum value, measured under ideal test conditions, specifically:
  • on a block made of mild steel, effectively closing the magnetic flux
  • whose thickness equals approx. 10 mm
  • with a plane free of scratches
  • without any insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

Real force is affected by working environment parameters, including (from priority):
  • Clearance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate decreases the holding force.

Safety rules for work with NdFeB magnets
Warning for heart patients

Patients with a ICD have to maintain an absolute distance from magnets. The magnetism can disrupt the functioning of the implant.

Respect the power

Handle magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their power.

Magnet fragility

NdFeB magnets are ceramic materials, which means they are very brittle. Impact of two magnets leads to them breaking into small pieces.

Precision electronics

Note: neodymium magnets produce a field that confuses sensitive sensors. Maintain a separation from your phone, device, and GPS.

Safe distance

Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Nickel coating and allergies

Some people have a sensitization to nickel, which is the typical protective layer for neodymium magnets. Extended handling might lead to dermatitis. We suggest wear safety gloves.

Heat warning

Control the heat. Exposing the magnet to high heat will ruin its properties and pulling force.

Keep away from children

These products are not toys. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Bone fractures

Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Protective gloves are recommended.

Dust is flammable

Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Warning! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98