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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

product parameters »

5.17 ZŁ with VAT / pcs + price for transport

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Technical data of the product - 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 modeling of the magnet - data

These information constitute the direct effect of a physical analysis. Values were calculated on models for the class Nd2Fe14B. Operational parameters might slightly differ. Please consider these calculations as a reference point for designers.

Table 1: Static force (pull 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 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
 weak grip
15 mm 907 Gs
90.7 mT
 0.17 kg / 0.37 pounds
169.7 g / 1.7 N
 weak grip
20 mm 544 Gs
54.4 mT
 0.06 kg / 0.13 pounds
61.1 g / 0.6 N
 weak grip
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.03 pounds
11.9 g / 0.1 N
 weak grip
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 pounds
1.2 g / 0.0 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of gap. Remember that even a very thin break (e.g., dirt, paint, rust) noticeably reduces the pull force. Neodymiums work strongest during direct contact; gap kills the force. See how rapidly the load capacity fall, when the magnet does not touch directly to the steel surface. When calculating the arrangement, eliminate redundant distances.

Table 2: Sliding capacity (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
This section calculates the approximate holding capacity needed to cause the sliding of the magnet downwards against a vertical steel plate (assuming standard friction). This value varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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 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
When mounting a magnet on a vertical surface (e.g., a board), it you can count on only approx. 20%-30% of its nominal power. Gravitational force and a low friction coefficient mean that magnets move down easier than they pop off the substrate. Want to create a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a noticeably lighter weight. Utilizing a rubberized coating can drastically improve the result.

Table 4: Steel thickness (substrate influence) - 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 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
A thin metal plate is not enough to take in the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a too thin substrate, the flux will pass right through and the holding will be smaller. To squeeze 100% of this magnet's potential, you need a suitably thick backing of steel. The saturation effect means that on thin elements (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel thickness from these parameters.

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
Ordinary NdFeB products change their properties parameters above the temperature limit. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. As the temperature rises, the magnet's power briefly drops. Refrain from using this magnet near heat sources higher than its operating temperature limit. Too high temperature will cause destruction of magnetic properties.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MP 20x8x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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
Two strong neodymiums interact from a wider radius than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a larger range of operation. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the connection force, but still impressive.
*The magnetic induction in repulsion mode drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Attention: Figures refer to friction force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (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
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
Powerful magnet radiation is a serious hazard to electronic devices and medical implants. These NdFeB products generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (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
Magnetic elements are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can cause material chips or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MP 20x8x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 15 688 Mx 156.9 µWb
Pc Coefficient 1.14 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter when building generators as well as sensors. The Pc coefficient 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%
Rust risk: 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. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Power loss vs temp

*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

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
Material specification
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
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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 is a crucial issue when working with model MP 20x8x6 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. 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 magnets in hermetic housing 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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 6 mm. The key parameter here is the holding force 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. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of neodymium magnets.

Pros

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They do not lose power, even after nearly 10 years – the drop in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets are distinguished by remarkably resistant to magnetic field loss caused by external field sources,
  • Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
  • Magnets are characterized by maximum magnetic induction on the active area,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of detailed machining as well as adapting to individual needs,
  • Fundamental importance in innovative solutions – they find application in hard drives, drive modules, precision medical tools, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in small systems

Disadvantages

Cons of neodymium magnets and proposals for their use:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Pull force analysis

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

The force parameter is a result of laboratory testing conducted under specific, ideal conditions:
  • using a base made of mild steel, functioning as a circuit closing element
  • with a cross-section minimum 10 mm
  • with a surface free of scratches
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction perpendicular to the plane
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

During everyday use, the real power depends on many variables, listed from the most important:
  • Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Medical interference

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

Bodily injuries

Large magnets can smash fingers in a fraction of a second. Under no circumstances put your hand betwixt two attracting surfaces.

Handling guide

Handle with care. Rare earth magnets attract from a distance and connect with huge force, often faster than you can react.

Electronic hazard

Device Safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Avoid contact if allergic

A percentage of the population suffer from a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause an allergic reaction. We strongly advise wear safety gloves.

Swallowing risk

Neodymium magnets are not intended for children. Accidental ingestion of a few magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates urgent medical intervention.

Dust is flammable

Dust created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Eye protection

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Demagnetization risk

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

GPS Danger

A strong magnetic field interferes with the operation of compasses in smartphones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?