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MP 10x4.3x4 / N38 - ring magnet

ring magnet

Catalog no 030178

GTIN/EAN: 5906301811954

5.00

Diameter

10 mm [±0,1 mm]

internal diameter Ø

4.3 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

1.92 g

Magnetization Direction

↑ axial

Load capacity

2.28 kg / 22.35 N

Magnetic Induction

386.91 mT / 3869 Gs

Coating

[NiCuNi] Nickel

product parameters »

1.045 ZŁ with VAT / pcs + price for transport

0.850 ZŁ net + 23% VAT / pcs

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Technical of the product - MP 10x4.3x4 / N38 - ring magnet

Specification / characteristics - MP 10x4.3x4 / N38 - ring magnet

properties
properties values
Cat. no. 030178
GTIN/EAN 5906301811954
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 10 mm [±0,1 mm]
internal diameter Ø 4.3 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 1.92 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.28 kg / 22.35 N
Magnetic Induction ~ ? 386.91 mT / 3869 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 10x4.3x4 / 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 magnet - data

The following information are the result of a physical simulation. Results were calculated on models for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Please consider these calculations as a reference point for designers.

Table 1: Static force (pull vs distance) - power drop
MP 10x4.3x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6115 Gs
611.5 mT
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
 medium risk
1 mm 4915 Gs
491.5 mT
 1.47 kg / 3.25 LBS
1473.3 g / 14.5 N
 low risk
2 mm 3833 Gs
383.3 mT
 0.90 kg / 1.97 LBS
895.7 g / 8.8 N
 low risk
3 mm 2949 Gs
294.9 mT
 0.53 kg / 1.17 LBS
530.3 g / 5.2 N
 low risk
5 mm 1761 Gs
176.1 mT
 0.19 kg / 0.42 LBS
189.1 g / 1.9 N
 low risk
10 mm 612 Gs
61.2 mT
 0.02 kg / 0.05 LBS
22.8 g / 0.2 N
 low risk
15 mm 284 Gs
28.4 mT
 0.00 kg / 0.01 LBS
4.9 g / 0.0 N
 low risk
20 mm 157 Gs
15.7 mT
 0.00 kg / 0.00 LBS
1.5 g / 0.0 N
 low risk
30 mm 64 Gs
6.4 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 low risk
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Pulling power decreases significantly per each millimeter of spacing. Note that every additional insulation layer (e.g., dirt, paint, dust) noticeably reduces the pull force. Magnets hold optimally during direct contact; distance nullifies the force. Observe how quickly the parameters fall, when the product does not adhere directly to the metal substrate. When designing the mounting, eliminate unnecessary gaps.

Table 2: Vertical capacity (wall)
MP 10x4.3x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.46 kg / 1.01 LBS
456.0 g / 4.5 N
1 mm Stal (~0.2) 0.29 kg / 0.65 LBS
294.0 g / 2.9 N
2 mm Stal (~0.2) 0.18 kg / 0.40 LBS
180.0 g / 1.8 N
3 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
5 mm Stal (~0.2) 0.04 kg / 0.08 LBS
38.0 g / 0.4 N
10 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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 following data presents the estimated force required to initiate the shifting of the magnet down along a upright steel wall (considering standard friction coefficient). This parameter varies with the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 10x4.3x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.68 kg / 1.51 LBS
684.0 g / 6.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.46 kg / 1.01 LBS
456.0 g / 4.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.50 LBS
228.0 g / 2.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.14 kg / 2.51 LBS
1140.0 g / 11.2 N
When mounting a element on a upright plane (e.g., a board), it you can count on barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient mean that magnets slip easier than they pull off. Designing a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Utilizing a rubberized layer can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MP 10x4.3x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.23 kg / 0.50 LBS
228.0 g / 2.2 N
1 mm
25%
 0.57 kg / 1.26 LBS
570.0 g / 5.6 N
2 mm
50%
 1.14 kg / 2.51 LBS
1140.0 g / 11.2 N
3 mm
75%
 1.71 kg / 3.77 LBS
1710.0 g / 16.8 N
5 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
10 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
11 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
12 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
A thin sheet is incapable of conduct the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a weak sheet, the magnetism will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's power, you need a suitably thick piece of metal. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MP 10x4.3x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
 OK
40 °C -2.2% 2.23 kg / 4.92 LBS
2229.8 g / 21.9 N
 OK
60 °C -4.4% 2.18 kg / 4.81 LBS
2179.7 g / 21.4 N
 OK
80 °C -6.6% 2.13 kg / 4.69 LBS
2129.5 g / 20.9 N
100 °C -28.8% 1.62 kg / 3.58 LBS
1623.4 g / 15.9 N
Standard neodymium magnets change their properties parameters above the temperature limit. Avoid high temperatures – excessive heat can irreversibly destroy this product. With increasing heat, the neodymium's capacity momentarily lowers. Avoid using this magnet close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) risk losing magnetic properties at lower temperatures than long magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MP 10x4.3x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.93 kg / 28.50 LBS
6 169 Gs
1.94 kg / 4.27 LBS
1939 g / 19.0 N
 N/A
1 mm 10.50 kg / 23.16 LBS
11 025 Gs
1.58 kg / 3.47 LBS
1576 g / 15.5 N
 9.45 kg / 20.84 LBS
~0 Gs
2 mm 8.35 kg / 18.41 LBS
9 831 Gs
1.25 kg / 2.76 LBS
1253 g / 12.3 N
 7.52 kg / 16.57 LBS
~0 Gs
3 mm 6.55 kg / 14.43 LBS
8 703 Gs
0.98 kg / 2.17 LBS
982 g / 9.6 N
 5.89 kg / 12.99 LBS
~0 Gs
5 mm 3.91 kg / 8.63 LBS
6 729 Gs
0.59 kg / 1.29 LBS
587 g / 5.8 N
 3.52 kg / 7.76 LBS
~0 Gs
10 mm 1.07 kg / 2.36 LBS
3 522 Gs
0.16 kg / 0.35 LBS
161 g / 1.6 N
 0.96 kg / 2.13 LBS
~0 Gs
20 mm 0.13 kg / 0.29 LBS
1 223 Gs
0.02 kg / 0.04 LBS
19 g / 0.2 N
 0.12 kg / 0.26 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
194 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
129 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
91 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
66 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
50 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
39 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and sheet setup. The setup of magnet-to-magnet generates a stronger field and a further horizon of action. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is massive. The repulsion force is a bit weaker than the attraction, but still large.
*Field value for N-N configuration drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
* Results apply to shear force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
MP 10x4.3x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 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 large risk to electronic devices as well as pacemakers. These magnets generate a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MP 10x4.3x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.97 km/h
(9.71 m/s)
 0.09 J
30 mm 60.20 km/h
(16.72 m/s)
 0.27 J
50 mm 77.71 km/h
(21.59 m/s)
 0.45 J
100 mm 109.90 km/h
(30.53 m/s)
 0.89 J
Magnetic elements are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can cause material chips or injury to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MP 10x4.3x4 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MP 10x4.3x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 017 Mx 40.2 µWb
Pc Coefficient 1.44 High (Stable)
Flux value passing through the magnet pole. Essential parameter when building generators and motors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 10x4.3x4 / N38

Environment Effective steel pull Effect
Air (land) 2.28 kg Standard
Water (riverbed) 2.61 kg
(+0.33 kg buoyancy gain)
+14.5%
Corrosion 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. Shear force

*Warning: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.44

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%
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: 030178-2026
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The ring-shaped magnet MP 10x4.3x4 / 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. 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 10x4.3x4 / 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 too much pressure 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
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 (10 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø10x4 mm and a weight of 1.92 g. The key parameter here is the lifting capacity amounting to approximately 2.28 kg (force ~22.35 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 4.3 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Advantages

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets prove to be remarkably resistant to demagnetization caused by external field sources,
  • A magnet with a smooth silver surface has better aesthetics,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of accurate forming and modifying to defined conditions,
  • Fundamental importance in future technologies – they are commonly used in hard drives, brushless drives, medical devices, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • 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 reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complex shapes in magnets, we propose using cover - magnetic holder.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

The lifting capacity listed is a measurement result executed under specific, ideal conditions:
  • using a plate made of low-carbon steel, serving as a circuit closing element
  • with a thickness minimum 10 mm
  • with an ground touching surface
  • with direct contact (without impurities)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

What influences lifting capacity in practice

Real force is influenced by working environment parameters, including (from priority):
  • Gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, rust or dirt).
  • Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Magnetic interference

GPS units and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Protect data

Very strong magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Dust is flammable

Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Physical harm

Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Protective goggles

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Allergy Warning

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, cease working with magnets and use protective gear.

Safe operation

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

Danger to pacemakers

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Power loss in heat

Monitor thermal conditions. Heating the magnet to high heat will ruin its properties and pulling force.

Adults only

Only for adults. Small elements pose a choking risk, causing intestinal necrosis. Keep out of reach of children and animals.

Important! Need more info? Read our article: Are neodymium magnets dangerous?