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MP 20x8x6 / N38 - ring magnet

ring magnet

Catalog no 030189

GTIN/EAN: 5906301812067

5.00
Load capacity 7.22 kg / 70.81 N Magnetic Induction 318.85 mT / 3188 Gs
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
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product parameters »

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Frequently asked questions

What is the hole in a ring magnet for?
For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.
What is the polarisation?
Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.
What sizes are available?
Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 analysis of the assembly - data

Presented data represent the direct effect of a physical simulation. Results rely on models for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - 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 LBS
7220.0 g / 70.8 N
 strong
1 mm 5321 Gs
532.1 mT
 5.84 kg / 12.87 LBS
5839.8 g / 57.3 N
 strong
2 mm 4736 Gs
473.6 mT
 4.63 kg / 10.20 LBS
4626.6 g / 45.4 N
 strong
3 mm 4184 Gs
418.4 mT
 3.61 kg / 7.96 LBS
3610.0 g / 35.4 N
 strong
5 mm 3216 Gs
321.6 mT
 2.13 kg / 4.70 LBS
2132.9 g / 20.9 N
 strong
10 mm 1650 Gs
165.0 mT
 0.56 kg / 1.24 LBS
561.3 g / 5.5 N
 low risk
15 mm 907 Gs
90.7 mT
 0.17 kg / 0.37 LBS
169.7 g / 1.7 N
 low risk
20 mm 544 Gs
54.4 mT
 0.06 kg / 0.13 LBS
61.1 g / 0.6 N
 low risk
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.03 LBS
11.9 g / 0.1 N
 low risk
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 LBS
1.2 g / 0.0 N
 low risk
Grip strength decreases drastically per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) strongly weakens the grip. Neodymiums operate strongest during direct contact; distance weakens the power. Analyze how flashily the pull force fall, when the product does not adhere flatly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Vertical hold (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 LBS
1444.0 g / 14.2 N
1 mm Stal (~0.2) 1.17 kg / 2.57 LBS
1168.0 g / 11.5 N
2 mm Stal (~0.2) 0.93 kg / 2.04 LBS
926.0 g / 9.1 N
3 mm Stal (~0.2) 0.72 kg / 1.59 LBS
722.0 g / 7.1 N
5 mm Stal (~0.2) 0.43 kg / 0.94 LBS
426.0 g / 4.2 N
10 mm Stal (~0.2) 0.11 kg / 0.25 LBS
112.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.07 LBS
34.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 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 estimated shear load needed to initiate the slippage of the magnet downwards along a upright metal surface (assuming standard friction). This parameter is a function of the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
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 LBS
2166.0 g / 21.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.44 kg / 3.18 LBS
1444.0 g / 14.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.72 kg / 1.59 LBS
722.0 g / 7.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.61 kg / 7.96 LBS
3610.0 g / 35.4 N
When mounting a element on a upright surface (e.g., a car body), it you can count on just approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient cause that holders move down easier than they detach. Planning a hanger? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter weight. Using a rubber layer can drastically raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MP 20x8x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.72 kg / 1.59 LBS
722.0 g / 7.1 N
1 mm
25%
 1.81 kg / 3.98 LBS
1805.0 g / 17.7 N
2 mm
50%
 3.61 kg / 7.96 LBS
3610.0 g / 35.4 N
3 mm
75%
 5.42 kg / 11.94 LBS
5415.0 g / 53.1 N
5 mm
100%
 7.22 kg / 15.92 LBS
7220.0 g / 70.8 N
10 mm
100%
 7.22 kg / 15.92 LBS
7220.0 g / 70.8 N
11 mm
100%
 7.22 kg / 15.92 LBS
7220.0 g / 70.8 N
12 mm
100%
 7.22 kg / 15.92 LBS
7220.0 g / 70.8 N
A thin sheet is not enough to focus the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the field will penetrate right through and the attraction force will be weaker. To utilize the maximum of this magnet's potential, you require a sufficiently solid backing of metal. The material oversaturation means that on thin elements (e.g., thin profiles), the product holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal stability (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 LBS
7220.0 g / 70.8 N
 OK
40 °C -2.2% 7.06 kg / 15.57 LBS
7061.2 g / 69.3 N
 OK
60 °C -4.4% 6.90 kg / 15.22 LBS
6902.3 g / 67.7 N
 OK
80 °C -6.6% 6.74 kg / 14.87 LBS
6743.5 g / 66.2 N
100 °C -28.8% 5.14 kg / 11.33 LBS
5140.6 g / 50.4 N
Ordinary NdFeB products irreversibly lose parameters past the thermal threshold. Watch out for overheating – high temperature can permanently destroy this product. With increasing heat, the magnet's force momentarily decreases. Avoid using this product close to ovens exceeding its safe range. Too high temperature will cause permanent loss of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
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 LBS
6 121 Gs
7.87 kg / 17.34 LBS
7867 g / 77.2 N
 N/A
1 mm 47.33 kg / 104.35 LBS
11 242 Gs
7.10 kg / 15.65 LBS
7100 g / 69.6 N
 42.60 kg / 93.91 LBS
~0 Gs
2 mm 42.42 kg / 93.52 LBS
10 642 Gs
6.36 kg / 14.03 LBS
6363 g / 62.4 N
 38.18 kg / 84.16 LBS
~0 Gs
3 mm 37.84 kg / 83.42 LBS
10 051 Gs
5.68 kg / 12.51 LBS
5675 g / 55.7 N
 34.05 kg / 75.07 LBS
~0 Gs
5 mm 29.73 kg / 65.55 LBS
8 910 Gs
4.46 kg / 9.83 LBS
4460 g / 43.8 N
 26.76 kg / 59.00 LBS
~0 Gs
10 mm 15.49 kg / 34.16 LBS
6 432 Gs
2.32 kg / 5.12 LBS
2324 g / 22.8 N
 13.94 kg / 30.74 LBS
~0 Gs
20 mm 4.08 kg / 8.99 LBS
3 299 Gs
0.61 kg / 1.35 LBS
612 g / 6.0 N
 3.67 kg / 8.09 LBS
~0 Gs
50 mm 0.18 kg / 0.41 LBS
702 Gs
0.03 kg / 0.06 LBS
28 g / 0.3 N
 0.17 kg / 0.37 LBS
~0 Gs
60 mm 0.09 kg / 0.19 LBS
480 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
70 mm 0.04 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 interact from a much further distance than a neodymium and metal setup. The connection of magnet-to-magnet produces a massive flux and a larger range of operation. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the pinch force is extreme. The levitation is marginally weaker than the connection force, but still large.
*Flux density between like poles drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
* Figures demonstrate sliding force of two same magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
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
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
Powerful magnet radiation poses a large risk to electronics as well as medical implants. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and housings. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MP 20x8x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.18 km/h
(6.72 m/s)
 0.27 J
30 mm 25.24 km/h
(7.01 m/s)
 0.29 J
50 mm 25.27 km/h
(7.02 m/s)
 0.29 J
100 mm 25.28 km/h
(7.02 m/s)
 0.29 J
NdFeB products are delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during installation so it doesn't hit violently against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when working with large magnets.

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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

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)
Flux value passing through the pole surface. Key data when building generators as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
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.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds just a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Temperature resistance

*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

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.

Technical and environmental data

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%

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
Measurement Calculator

Magnet pull force

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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. 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. 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. 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
The inner hole diameter determines the maximum size of the mounting element. 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 mounting hole diameter is precisely 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.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose strength, even during around 10 years – the reduction in strength is only ~1% (according to tests),
  • They have excellent resistance to magnetic field loss when exposed to external magnetic sources,
  • Thanks to the smooth finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of individual modeling as well as optimizing to individual conditions,
  • Universal use in modern industrial fields – they find application in mass storage devices, brushless drives, diagnostic systems, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Problematic aspects of neodymium magnets: tips and applications.
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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
  • We suggest cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Additionally, small components 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 hinders application in large quantities

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what affects it?

Breakaway force is the result of a measurement for optimal configuration, taking into account:
  • using a sheet made of high-permeability steel, serving as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with a plane free of scratches
  • without any clearance between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at temperature room level

Key elements affecting lifting force

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:
  • Distance – existence of any layer (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be lost into the air.
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a small distance between the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
ICD Warning

Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Demagnetization risk

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

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, cease working with magnets and use protective gear.

Physical harm

Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Do not drill into magnets

Powder produced during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Magnetic media

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Eye protection

Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Threat to navigation

Be aware: rare earth magnets generate a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

No play value

Strictly store magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are tragic.

Safe operation

Be careful. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can react.

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