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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

technical specifications »

7.75 ZŁ with VAT / pcs + price for transport

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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

Engineering analysis of the assembly - data

These data represent the outcome of a engineering calculation. Results rely on algorithms for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - 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 pounds
6650.0 g / 65.2 N
 warning
1 mm 2265 Gs
226.5 mT
 5.81 kg / 12.80 pounds
5807.9 g / 57.0 N
 warning
2 mm 2070 Gs
207.0 mT
 4.85 kg / 10.69 pounds
4851.0 g / 47.6 N
 warning
3 mm 1858 Gs
185.8 mT
 3.91 kg / 8.61 pounds
3906.5 g / 38.3 N
 warning
5 mm 1437 Gs
143.7 mT
 2.34 kg / 5.16 pounds
2338.7 g / 22.9 N
 warning
10 mm 691 Gs
69.1 mT
 0.54 kg / 1.19 pounds
540.5 g / 5.3 N
 safe
15 mm 343 Gs
34.3 mT
 0.13 kg / 0.29 pounds
133.3 g / 1.3 N
 safe
20 mm 186 Gs
18.6 mT
 0.04 kg / 0.09 pounds
39.3 g / 0.4 N
 safe
30 mm 70 Gs
7.0 mT
 0.01 kg / 0.01 pounds
5.5 g / 0.1 N
 safe
50 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 safe
Grip strength decreases significantly with every mm of distance. Note that even a very thin break (e.g., contamination, paint, rust) significantly reduces the pull force. Neodymiums operate strongest at the point of direct contact; gap drastically cuts the power. Observe how rapidly the parameters drop, when the product does not touch flatly to the steel surface. When planning the mounting, eliminate additional spacers.

Table 2: Vertical load (vertical surface)
MP 20x8/4x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.33 kg / 2.93 pounds
1330.0 g / 13.0 N
1 mm Stal (~0.2) 1.16 kg / 2.56 pounds
1162.0 g / 11.4 N
2 mm Stal (~0.2) 0.97 kg / 2.14 pounds
970.0 g / 9.5 N
3 mm Stal (~0.2) 0.78 kg / 1.72 pounds
782.0 g / 7.7 N
5 mm Stal (~0.2) 0.47 kg / 1.03 pounds
468.0 g / 4.6 N
10 mm Stal (~0.2) 0.11 kg / 0.24 pounds
108.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 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
The following data shows the estimated shear load necessary to cause the downward movement of the magnet down against a vertical steel plate (considering typical friction coefficient). This parameter is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
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 pounds
1995.0 g / 19.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.33 kg / 2.93 pounds
1330.0 g / 13.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.67 kg / 1.47 pounds
665.0 g / 6.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.33 kg / 7.33 pounds
3325.0 g / 32.6 N
When mounting a element on a vertical surface (e.g., a fridge), it will only hold just about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient cause that holders slide down faster than they pull off. Want to create a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a significantly smaller load. Utilizing a rubberized layer can significantly improve the result.

Table 4: Steel thickness (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 pounds
665.0 g / 6.5 N
1 mm
25%
 1.66 kg / 3.67 pounds
1662.5 g / 16.3 N
2 mm
50%
 3.33 kg / 7.33 pounds
3325.0 g / 32.6 N
3 mm
75%
 4.99 kg / 11.00 pounds
4987.5 g / 48.9 N
5 mm
100%
 6.65 kg / 14.66 pounds
6650.0 g / 65.2 N
10 mm
100%
 6.65 kg / 14.66 pounds
6650.0 g / 65.2 N
11 mm
100%
 6.65 kg / 14.66 pounds
6650.0 g / 65.2 N
12 mm
100%
 6.65 kg / 14.66 pounds
6650.0 g / 65.2 N
A thin metal plate is unable to take in the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a thin surface, the field will pass right through and the pull force will drop sharply. To squeeze the maximum of this magnet's power, you need a suitably thick piece of steel. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - 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 pounds
6650.0 g / 65.2 N
 OK
40 °C -2.2% 6.50 kg / 14.34 pounds
6503.7 g / 63.8 N
 OK
60 °C -4.4% 6.36 kg / 14.02 pounds
6357.4 g / 62.4 N
80 °C -6.6% 6.21 kg / 13.69 pounds
6211.1 g / 60.9 N
100 °C -28.8% 4.73 kg / 10.44 pounds
4734.8 g / 46.4 N
Classic neodymiums lose strength past the thermal threshold. Protect against heat – high temperature can permanently demagnetize this magnet. As the temperature rises, the magnet's force temporarily lowers. Refrain from using this magnet in hot environments exceeding its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.
*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.28 kg / 20.47 pounds
4 012 Gs
1.39 kg / 3.07 pounds
1393 g / 13.7 N
 N/A
1 mm 8.73 kg / 19.25 pounds
4 701 Gs
1.31 kg / 2.89 pounds
1310 g / 12.8 N
 7.86 kg / 17.33 pounds
~0 Gs
2 mm 8.11 kg / 17.88 pounds
4 530 Gs
1.22 kg / 2.68 pounds
1216 g / 11.9 N
 7.30 kg / 16.09 pounds
~0 Gs
3 mm 7.45 kg / 16.42 pounds
4 342 Gs
1.12 kg / 2.46 pounds
1117 g / 11.0 N
 6.70 kg / 14.78 pounds
~0 Gs
5 mm 6.10 kg / 13.45 pounds
3 930 Gs
0.92 kg / 2.02 pounds
915 g / 9.0 N
 5.49 kg / 12.11 pounds
~0 Gs
10 mm 3.27 kg / 7.20 pounds
2 875 Gs
0.49 kg / 1.08 pounds
490 g / 4.8 N
 2.94 kg / 6.48 pounds
~0 Gs
20 mm 0.75 kg / 1.66 pounds
1 382 Gs
0.11 kg / 0.25 pounds
113 g / 1.1 N
 0.68 kg / 1.50 pounds
~0 Gs
50 mm 0.02 kg / 0.04 pounds
220 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
60 mm 0.01 kg / 0.02 pounds
139 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.01 pounds
93 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
65 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
47 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
35 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a wider radius than a magnet and steel setup. The setup of magnet-to-magnet produces a massive flux and a larger range of operation. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is a bit weaker than the connection force, but still large.
*Field value in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Note: Results refer to sliding force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - 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
Mechanical watch 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
Powerful magnet radiation poses a serious hazard to electronic devices as well as pacemakers. These neodymiums produce a flux that disrupts operation of digital equipment. Remember: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (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 delicate – a collision with steel causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when working 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
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 as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*For N38 grade, the max working temp 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
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%
Ecology and recycling (GPSR)
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
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The ring-shaped magnet MP 20x8/4x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. 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 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 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.
A screw or bolt with a thread diameter smaller than 8/4 mm fits this model. 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. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 20 mm and thickness 5 mm. The pulling force of this model is an impressive 6.65 kg, which translates to 65.21 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose strength, even after nearly 10 years – the drop in power is only ~1% (according to tests),
  • They have excellent resistance to magnetism drop as a result of external fields,
  • In other words, due to the reflective layer of nickel, the element looks attractive,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • 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...
  • Possibility of custom forming and adapting to precise requirements,
  • Significant place in modern technologies – they serve a role in hard drives, electric motors, medical devices, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in small systems

Weaknesses

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets can complicate diagnosis medical in case of swallowing.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

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

The declared magnet strength represents the peak performance, obtained under ideal test conditions, meaning:
  • with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
  • with a thickness no less than 10 mm
  • with a surface cleaned and smooth
  • with zero gap (no impurities)
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the application force will differ subject to the following factors, starting with the most relevant:
  • Distance – the presence of any layer (paint, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Plate thickness – too thin plate does not close the flux, causing part of the flux to be escaped to the other side.
  • Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Nickel allergy

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

Maximum temperature

Do not overheat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Fire warning

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

Do not give to children

Always keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Medical implants

Individuals with a heart stimulator should maintain an large gap from magnets. The magnetic field can stop the operation of the implant.

Data carriers

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Pinching danger

Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

GPS and phone interference

GPS units and mobile phones are highly susceptible to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.

Respect the power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Danger! Need more info? Read our article: Why are neodymium magnets dangerous?