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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

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7.75 ZŁ with VAT / pcs + price for transport

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Parameters as well as shape of a neodymium magnet can be checked using our magnetic calculator.

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Physical properties - 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

Physical analysis of the product - technical parameters

Presented information represent the outcome of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull 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 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
Magnetic force weakens drastically with every subsequent millimeter of distance. Remember that even the smallest gap (e.g., dirt, varnish, veneer) significantly reduces the pull force. Magnets hold most effectively at the point of direct contact; gap nullifies the power. Analyze how flashily the pull force plummet, when the magnet does not touch flatly to the steel surface. When calculating the mounting, discard unnecessary gaps.

Table 2: Sliding 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 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
The following data shows the approximate weight limit sufficient to initiate the shifting of the magnet down against a upright metal surface (considering standard friction). The holding force is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - 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 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 magnet on a vertical wall (e.g., a board), it will only hold just approx. 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient mean that products slide down faster than they pull off. Designing a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter weight. Using a rubber pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - power losses
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 sheet is incapable of focus the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a too thin substrate, the field will pass right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the holder works worse. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (stability) - power drop
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 above the temperature limit. Avoid high temperatures – high temperature can permanently destroy this product. With every degree above norm, the neodymium's power momentarily lowers. Refrain from using this product close to ovens exceeding its working range. Ignoring the limit will lead to destruction of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties sooner than long magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (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 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 magnetic products interact from a much further distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a wider radius of performance. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still significant.
*Flux density in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Calculations refer to friction force of two same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
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
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 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 is a real danger to electronics and pacemakers. These neodymiums generate a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and plastic. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (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
Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. 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. Note the thickness of the protective layer.

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 passing through the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines 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.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Caution: On a vertical wall, the magnet retains merely a fraction of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*For N38 material, 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

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
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%
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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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. 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 20x8/4x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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. 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. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø20x5 mm and a weight of 11.31 g. The key parameter here is the lifting capacity amounting to approximately 6.65 kg (force ~65.21 N). The mounting hole diameter is precisely 8/4 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 Nd2Fe14B magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They do not lose their magnetic properties even under external field action,
  • In other words, due to the aesthetic finish of gold, the element looks attractive,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in constructing and the capacity to modify to individual projects,
  • Fundamental importance in electronics industry – they are used in magnetic memories, electric drive systems, diagnostic systems, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these products can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Magnet power was determined for ideal contact conditions, assuming:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • with a plane cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Determinants of practical lifting force of a magnet

It is worth knowing that the application force will differ depending on elements below, starting with the most relevant:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content lower magnetic properties and holding force.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Flammability

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Life threat

For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or request help to work with the magnets.

Electronic devices

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Metal Allergy

Some people have a contact allergy to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause a rash. We suggest use safety gloves.

Choking Hazard

Strictly store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Hand protection

Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Immense force

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

Keep away from electronics

Be aware: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, device, and navigation systems.

Protective goggles

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Permanent damage

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

Warning! Learn more about hazards in the article: Safety of working with magnets.