Neodymium magnets – most powerful on the market

Need strong magnetic field? We have in stock complete range of disc, cylindrical and ring magnets. Perfect for for domestic applications, workshop and industrial tasks. See products available immediately.

discover magnet catalog

Equipment for treasure hunters

Start your adventure with treasure salvaging! Our double-handle grips (F200, F400) provide grip certainty and huge lifting capacity. Solid, corrosion-resistant housing and reinforced ropes will perform in rivers and lakes.

choose your water magnet

Reliable threaded grips

Reliable solutions for mounting non-invasive. Threaded mounts (external or internal) guarantee quick improvement of work on warehouses. Perfect for mounting lamps, detectors and ads.

see industrial applications

📦 Fast shipping: buy by 14:00, package goes out today!

Dhit sp. z o.o.
Product available Ships today (order by 14:00)

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

bulk discounts:

Need more?

price from 1 pcs
4.20 ZŁ
5.17 ZŁ
price from 150 pcs
3.95 ZŁ
4.86 ZŁ
price from 600 pcs
3.70 ZŁ
4.55 ZŁ
Do you have doubts?

Pick up the phone and ask +48 888 99 98 98 or get in touch by means of request form the contact section.
Force as well as structure of magnetic components can be reviewed on our force calculator.

Orders submitted before 14:00 will be dispatched today!

Technical parameters - 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

Engineering simulation of the product - report

Presented values constitute the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
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
warning
1 mm 5321 Gs
532.1 mT
5.84 kg / 12.87 pounds
5839.8 g / 57.3 N
warning
2 mm 4736 Gs
473.6 mT
4.63 kg / 10.20 pounds
4626.6 g / 45.4 N
warning
3 mm 4184 Gs
418.4 mT
3.61 kg / 7.96 pounds
3610.0 g / 35.4 N
warning
5 mm 3216 Gs
321.6 mT
2.13 kg / 4.70 pounds
2132.9 g / 20.9 N
warning
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: Slippage load (vertical surface)
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: Wall mounting (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: Material efficiency (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: Working in heat (material behavior) - thermal limit
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 (repulsion) - 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: Safety (HSE) (implants) - 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: Dynamics (cracking risk) - 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: Surface protection spec
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: Submerged application
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Note: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Thermal stability

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.14

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.

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: 030189-2026
Magnet Unit Converter
Pulling force

Magnetic Induction

View more proposals

The ring-shaped magnet MP 20x8x6 / N38 is created for mechanical fastening, 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. 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 is not sufficient for rain. 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 8 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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.
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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of neodymium magnets.

Benefits

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They do not lose strength, even during approximately 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the glossy layer of nickel, the element gains a professional look,
  • They are known for 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 can function (depending on the shape) even at a temperature of 230°C or more...
  • In view of the potential of free molding and adaptation to specialized projects, magnetic components can be created in a wide range of geometric configurations, which amplifies use scope,
  • Versatile presence in high-tech industry – they serve a role in data components, motor assemblies, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose power 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 very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The force parameter is a measurement result performed under the following configuration:
  • using a sheet made of mild steel, acting as a circuit closing element
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an polished touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Key elements affecting lifting force

During everyday use, the actual lifting capacity is determined by several key aspects, ranked from the most important:
  • Gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be wasted to the other side.
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Warnings
Respect the power

Use magnets consciously. Their immense force can shock even professionals. Plan your moves and do not underestimate their force.

Maximum temperature

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

Precision electronics

Navigation devices and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Data carriers

Do not bring magnets near a wallet, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Flammability

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Nickel coating and allergies

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, cease handling magnets and use protective gear.

Risk of cracking

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Implant safety

Individuals with a heart stimulator must keep an absolute distance from magnets. The magnetic field can stop the functioning of the implant.

Finger safety

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Swallowing risk

NdFeB magnets are not toys. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.

Danger! Details about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98