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MP 20x8/4x5 / N38 - ring magnet

ring magnet

Catalog no 030333

GTIN/EAN: 5906301812272

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.31 g

Magnetization Direction

↑ axial

Load capacity

6.65 kg / 65.21 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

product parameters »

7.75 ZŁ with VAT / pcs + price for transport

6.30 ZŁ net + 23% VAT / pcs

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Detailed specification - MP 20x8/4x5 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet

properties
properties values
Cat. no. 030333
GTIN/EAN 5906301812272
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 8/4 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.31 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.65 kg / 65.21 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x5 / 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 product - data

Presented information constitute the outcome of a physical simulation. Results are based on models for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MP 20x8/4x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2424 Gs
242.4 mT
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
 warning
1 mm 2265 Gs
226.5 mT
 5.81 kg / 12.80 LBS
5807.9 g / 57.0 N
 warning
2 mm 2070 Gs
207.0 mT
 4.85 kg / 10.69 LBS
4851.0 g / 47.6 N
 warning
3 mm 1858 Gs
185.8 mT
 3.91 kg / 8.61 LBS
3906.5 g / 38.3 N
 warning
5 mm 1437 Gs
143.7 mT
 2.34 kg / 5.16 LBS
2338.7 g / 22.9 N
 warning
10 mm 691 Gs
69.1 mT
 0.54 kg / 1.19 LBS
540.5 g / 5.3 N
 low risk
15 mm 343 Gs
34.3 mT
 0.13 kg / 0.29 LBS
133.3 g / 1.3 N
 low risk
20 mm 186 Gs
18.6 mT
 0.04 kg / 0.09 LBS
39.3 g / 0.4 N
 low risk
30 mm 70 Gs
7.0 mT
 0.01 kg / 0.01 LBS
5.5 g / 0.1 N
 low risk
50 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 LBS
0.4 g / 0.0 N
 low risk
Grip strength drops drastically with every mm of gap. Note that even a very thin break (e.g., contamination, varnish, rust) significantly weakens the grip. Magnets operate optimally in perfect adhesion; gap drastically cuts the power. Notice how flashily the pull force plummet, when the magnet does not adhere flatly to the steel surface. When calculating the arrangement, eliminate additional spacers.

Table 2: Vertical hold (wall)
MP 20x8/4x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.33 kg / 2.93 LBS
1330.0 g / 13.0 N
1 mm Stal (~0.2) 1.16 kg / 2.56 LBS
1162.0 g / 11.4 N
2 mm Stal (~0.2) 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
3 mm Stal (~0.2) 0.78 kg / 1.72 LBS
782.0 g / 7.7 N
5 mm Stal (~0.2) 0.47 kg / 1.03 LBS
468.0 g / 4.6 N
10 mm Stal (~0.2) 0.11 kg / 0.24 LBS
108.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.06 LBS
26.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 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
This section shows the theoretical weight limit sufficient to initiate the sliding of the magnet down along a upright steel plate (assuming typical friction). This value is a function of the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 20x8/4x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.00 kg / 4.40 LBS
1995.0 g / 19.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.33 kg / 2.93 LBS
1330.0 g / 13.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.67 kg / 1.47 LBS
665.0 g / 6.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.33 kg / 7.33 LBS
3325.0 g / 32.6 N
When hanging a holder on a upright wall (e.g., a fridge), it will only hold barely about 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets slide down faster than they detach. Designing a hanger? Consider that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a much lighter load. Utilizing a rubberized coating can significantly increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 20x8/4x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.67 kg / 1.47 LBS
665.0 g / 6.5 N
1 mm
25%
 1.66 kg / 3.67 LBS
1662.5 g / 16.3 N
2 mm
50%
 3.33 kg / 7.33 LBS
3325.0 g / 32.6 N
3 mm
75%
 4.99 kg / 11.00 LBS
4987.5 g / 48.9 N
5 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
10 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
11 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
12 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
A thin metal plate is unable to absorb the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's potential, you need a suitably thick backing of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Working in heat (stability) - thermal limit
MP 20x8/4x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
 OK
40 °C -2.2% 6.50 kg / 14.34 LBS
6503.7 g / 63.8 N
 OK
60 °C -4.4% 6.36 kg / 14.02 LBS
6357.4 g / 62.4 N
80 °C -6.6% 6.21 kg / 13.69 LBS
6211.1 g / 60.9 N
100 °C -28.8% 4.73 kg / 10.44 LBS
4734.8 g / 46.4 N
Classic neodymiums change their properties strength after exceeding the maximum temperature. Protect against heat – heat can permanently damage this product. As the temperature rises, the magnet's power briefly decreases. Avoid using this magnet in hot environments exceeding its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 20x8/4x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.28 kg / 20.47 LBS
4 012 Gs
1.39 kg / 3.07 LBS
1393 g / 13.7 N
 N/A
1 mm 8.73 kg / 19.25 LBS
4 701 Gs
1.31 kg / 2.89 LBS
1310 g / 12.8 N
 7.86 kg / 17.33 LBS
~0 Gs
2 mm 8.11 kg / 17.88 LBS
4 530 Gs
1.22 kg / 2.68 LBS
1216 g / 11.9 N
 7.30 kg / 16.09 LBS
~0 Gs
3 mm 7.45 kg / 16.42 LBS
4 342 Gs
1.12 kg / 2.46 LBS
1117 g / 11.0 N
 6.70 kg / 14.78 LBS
~0 Gs
5 mm 6.10 kg / 13.45 LBS
3 930 Gs
0.92 kg / 2.02 LBS
915 g / 9.0 N
 5.49 kg / 12.11 LBS
~0 Gs
10 mm 3.27 kg / 7.20 LBS
2 875 Gs
0.49 kg / 1.08 LBS
490 g / 4.8 N
 2.94 kg / 6.48 LBS
~0 Gs
20 mm 0.75 kg / 1.66 LBS
1 382 Gs
0.11 kg / 0.25 LBS
113 g / 1.1 N
 0.68 kg / 1.50 LBS
~0 Gs
50 mm 0.02 kg / 0.04 LBS
220 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
60 mm 0.01 kg / 0.02 LBS
139 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.01 LBS
93 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
65 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
47 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
35 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and steel combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Planning to create a solid fastener? Apply two magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still large.
*Flux density between like poles is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
* Results show sliding force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 20x8/4x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a real danger to electronic devices as well as pacemakers. These NdFeB products generate a flux that destroys function of digital equipment. Notice: the unseen radiation penetrates the body and glass. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MP 20x8/4x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.67 km/h
(7.13 m/s)
 0.29 J
30 mm 42.38 km/h
(11.77 m/s)
 0.78 J
50 mm 54.68 km/h
(15.19 m/s)
 1.30 J
100 mm 77.33 km/h
(21.48 m/s)
 2.61 J
Neodymium magnets are very brittle – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Anti-corrosion coating durability
MP 20x8/4x5 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MP 20x8/4x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 218 Mx 72.2 µWb
Pc Coefficient 0.31 Low (Flat)
Flux value emitted by the pole surface. Key data when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MP 20x8/4x5 / N38

Environment Effective steel pull Effect
Air (land) 6.65 kg Standard
Water (riverbed) 7.61 kg
(+0.96 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical surface, the magnet retains just ~20% of its nominal pull.

2. Plate thickness effect

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

3. Power loss vs temp

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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
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%
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: 030333-2026
Measurement Calculator
Force (pull)
Magnetic Induction
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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 easy screwing to wood, wall, plastic, or metal. This product with a force of 6.65 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 20x8/4x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. 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 is not sufficient for rain. 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. 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.
This model is characterized by dimensions Ø20x5 mm and a weight of 11.31 g. The pulling force of this model is an impressive 6.65 kg, which translates to 65.21 N in newtons. The mounting hole diameter is precisely 8/4 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.

Advantages as well as disadvantages of neodymium magnets.

Advantages

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
  • Thanks to the smooth finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an professional appearance,
  • Magnetic induction on the working part of the magnet is extremely intense,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to the option of precise shaping and adaptation to custom projects, magnetic components can be manufactured in a wide range of geometric configurations, which makes them more universal,
  • Wide application in modern industrial fields – they are commonly used in mass storage devices, brushless drives, diagnostic systems, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Weaknesses

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of creating nuts in the magnet and complicated forms - recommended is casing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these products are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Highest magnetic holding force – what contributes to it?

The load parameter shown concerns the maximum value, obtained under optimal environment, meaning:
  • with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
  • with a thickness of at least 10 mm
  • characterized by smoothness
  • with zero gap (no coatings)
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Lifting capacity in real conditions – factors

Holding efficiency impacted by working environment parameters, including (from most important):
  • Gap (between the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or debris).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Do not drill into magnets

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Keep away from computers

Avoid bringing magnets close to a purse, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Conscious usage

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Magnetic interference

A powerful magnetic field interferes with the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a device to prevent breaking the sensors.

Warning for heart patients

Individuals with a heart stimulator should keep an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.

Permanent damage

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Crushing force

Big blocks can smash fingers in a fraction of a second. Never place your hand between two strong magnets.

Eye protection

Neodymium magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets leads to them breaking into shards.

Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, immediately stop handling magnets and wear gloves.

Choking Hazard

Always keep magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are life-threatening.

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