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MP 20x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030187

GTIN/EAN: 5906301812043

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

3.14 kg / 30.79 N

Magnetic Induction

178.11 mT / 1781 Gs

Coating

[NiCuNi] Nickel

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3.59 ZŁ with VAT / pcs + price for transport

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Technical specification - MP 20x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x3 / N38 - ring magnet

properties
properties values
Cat. no. 030187
GTIN/EAN 5906301812043
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 3 mm [±0,1 mm]
Weight 6.79 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.14 kg / 30.79 N
Magnetic Induction ~ ? 178.11 mT / 1781 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x3 / 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 modeling of the product - technical parameters

Presented values represent the outcome of a engineering calculation. Values rely on models for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these data as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
MP 20x8/4x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1531 Gs
153.1 mT
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
 warning
1 mm 1457 Gs
145.7 mT
 2.84 kg / 6.27 lbs
2843.2 g / 27.9 N
 warning
2 mm 1352 Gs
135.2 mT
 2.45 kg / 5.39 lbs
2446.6 g / 24.0 N
 warning
3 mm 1227 Gs
122.7 mT
 2.02 kg / 4.44 lbs
2016.2 g / 19.8 N
 warning
5 mm 963 Gs
96.3 mT
 1.24 kg / 2.74 lbs
1241.9 g / 12.2 N
 low risk
10 mm 465 Gs
46.5 mT
 0.29 kg / 0.64 lbs
289.3 g / 2.8 N
 low risk
15 mm 228 Gs
22.8 mT
 0.07 kg / 0.15 lbs
69.7 g / 0.7 N
 low risk
20 mm 122 Gs
12.2 mT
 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
 low risk
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.01 lbs
2.7 g / 0.0 N
 low risk
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 low risk
Magnetic force weakens sharply per each millimeter of distance. Remember that every additional insulation layer (e.g., contamination, paint, rust) strongly diminishes the holding power. Neodymiums operate optimally at the point of direct contact; air break nullifies the force. Observe how quickly the load capacity plummet, when the magnet does not touch tightly to the metal substrate. When planning the mounting, discard additional spacers.

Table 2: Slippage capacity (wall)
MP 20x8/4x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.63 kg / 1.38 lbs
628.0 g / 6.2 N
1 mm Stal (~0.2) 0.57 kg / 1.25 lbs
568.0 g / 5.6 N
2 mm Stal (~0.2) 0.49 kg / 1.08 lbs
490.0 g / 4.8 N
3 mm Stal (~0.2) 0.40 kg / 0.89 lbs
404.0 g / 4.0 N
5 mm Stal (~0.2) 0.25 kg / 0.55 lbs
248.0 g / 2.4 N
10 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
15 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below indicates the theoretical shear load needed to cause the downward movement of the magnet downwards on a vertical steel wall (assuming typical friction coefficient). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 20x8/4x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.94 kg / 2.08 lbs
942.0 g / 9.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.63 kg / 1.38 lbs
628.0 g / 6.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.31 kg / 0.69 lbs
314.0 g / 3.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.57 kg / 3.46 lbs
1570.0 g / 15.4 N
When hanging a holder on a vertical plane (e.g., a board), it will maintain just about 1/5 of its nominal power. Gravitational force and a low friction coefficient mean that magnets slide down easier than they detach. Designing a vertical fastening? Note that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a much lighter load. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 20x8/4x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.31 kg / 0.69 lbs
314.0 g / 3.1 N
1 mm
25%
 0.79 kg / 1.73 lbs
785.0 g / 7.7 N
2 mm
50%
 1.57 kg / 3.46 lbs
1570.0 g / 15.4 N
3 mm
75%
 2.36 kg / 5.19 lbs
2355.0 g / 23.1 N
5 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
10 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
11 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
12 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
A thin metal plate is unable to take in the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the pull force will drop sharply. To utilize the maximum of this magnet's potential, you need a suitably thick backing of steel. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - thermal limit
MP 20x8/4x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
 OK
40 °C -2.2% 3.07 kg / 6.77 lbs
3070.9 g / 30.1 N
 OK
60 °C -4.4% 3.00 kg / 6.62 lbs
3001.8 g / 29.4 N
80 °C -6.6% 2.93 kg / 6.47 lbs
2932.8 g / 28.8 N
100 °C -28.8% 2.24 kg / 4.93 lbs
2235.7 g / 21.9 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Avoid high temperatures – high temperature can permanently demagnetize this magnet. As the temperature rises, the magnet's capacity temporarily decreases. Avoid using this product close to heaters exceeding its working range. Ignoring the limit will cause irreversible degradation of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently sooner than taller cylinders. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 20x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.71 kg / 8.17 lbs
2 815 Gs
0.56 kg / 1.23 lbs
556 g / 5.5 N
 N/A
1 mm 3.55 kg / 7.83 lbs
2 998 Gs
0.53 kg / 1.17 lbs
533 g / 5.2 N
 3.20 kg / 7.05 lbs
~0 Gs
2 mm 3.36 kg / 7.40 lbs
2 915 Gs
0.50 kg / 1.11 lbs
503 g / 4.9 N
 3.02 kg / 6.66 lbs
~0 Gs
3 mm 3.13 kg / 6.90 lbs
2 815 Gs
0.47 kg / 1.04 lbs
470 g / 4.6 N
 2.82 kg / 6.21 lbs
~0 Gs
5 mm 2.63 kg / 5.81 lbs
2 582 Gs
0.40 kg / 0.87 lbs
395 g / 3.9 N
 2.37 kg / 5.23 lbs
~0 Gs
10 mm 1.47 kg / 3.23 lbs
1 926 Gs
0.22 kg / 0.48 lbs
220 g / 2.2 N
 1.32 kg / 2.91 lbs
~0 Gs
20 mm 0.34 kg / 0.75 lbs
930 Gs
0.05 kg / 0.11 lbs
51 g / 0.5 N
 0.31 kg / 0.68 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
143 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
90 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
59 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
41 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
30 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
22 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. The connection of two magnets produces a massive flux and a larger range of performance. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the impact force is extreme. The repulsion force is a bit weaker than the connection force, but still large.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).
Attention: Results show friction force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MP 20x8/4x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation is a real danger to electronic devices as well as medical implants. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MP 20x8/4x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.90 km/h
(6.36 m/s)
 0.14 J
30 mm 37.58 km/h
(10.44 m/s)
 0.37 J
50 mm 48.50 km/h
(13.47 m/s)
 0.62 J
100 mm 68.58 km/h
(19.05 m/s)
 1.23 J
Neodymium magnets are very brittle – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can destroy the magnet or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MP 20x8/4x3 / 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: Construction data (Pc)
MP 20x8/4x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 044 Mx 50.4 µWb
Pc Coefficient 0.20 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MP 20x8/4x3 / N38

Environment Effective steel pull Effect
Air (land) 3.14 kg Standard
Water (riverbed) 3.60 kg
(+0.46 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

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

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.20

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.

Engineering data and GPSR
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%
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: 030187-2026
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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. Thanks to the hole (often for a screw), this model enables easy screwing 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. It's a good idea to use a flexible washer 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 magnets in hermetic housing 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.
The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 3 mm. The key parameter here is the holding force amounting to approximately 3.14 kg (force ~30.79 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Magnets effectively protect themselves against demagnetization caused by external fields,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of precise forming as well as optimizing to specific requirements,
  • Fundamental importance in future technologies – they are utilized in computer drives, electric drive systems, medical equipment, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

Weaknesses

Cons of neodymium magnets: tips and applications.
  • At 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.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making nuts in the magnet and complex forms - preferred is cover - mounting mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small components of these magnets can be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Highest magnetic holding force – what it depends on?

Breakaway force is the result of a measurement for ideal contact conditions, taking into account:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • with a cross-section minimum 10 mm
  • with an polished touching surface
  • with zero gap (no impurities)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Effective lifting capacity is influenced by working environment parameters, such as (from most important):
  • Gap (betwixt the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Steel thickness – too thin steel does not close the flux, causing part of the power to be lost into the air.
  • Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

Safe handling of neodymium magnets
Crushing risk

Big blocks can crush fingers in a fraction of a second. Under no circumstances put your hand betwixt two strong magnets.

Choking Hazard

Only for adults. Small elements pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.

Data carriers

Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Nickel allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Dust is flammable

Powder generated during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Beware of splinters

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Compass and GPS

Note: rare earth magnets produce a field that confuses precision electronics. Keep a safe distance from your mobile, tablet, and GPS.

Handling guide

Be careful. Neodymium magnets act from a distance and snap with massive power, often quicker than you can move away.

Do not overheat magnets

Avoid heat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Medical implants

Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Security! Need more info? Check our post: Are neodymium magnets dangerous?