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MP 25x13x4 / N38 - ring magnet

ring magnet

Catalog no 030190

GTIN/EAN: 5906301812074

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

13 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

10.74 g

Magnetization Direction

↑ axial

Load capacity

4.14 kg / 40.57 N

Magnetic Induction

188.92 mT / 1889 Gs

Coating

[NiCuNi] Nickel

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6.77 ZŁ with VAT / pcs + price for transport

5.50 ZŁ net + 23% VAT / pcs

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Force as well as form of a neodymium magnet can be checked on our magnetic calculator.

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Technical parameters of the product - MP 25x13x4 / N38 - ring magnet

Specification / characteristics - MP 25x13x4 / N38 - ring magnet

properties
properties values
Cat. no. 030190
GTIN/EAN 5906301812074
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 25 mm [±0,1 mm]
internal diameter Ø 13 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 10.74 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.14 kg / 40.57 N
Magnetic Induction ~ ? 188.92 mT / 1889 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x4 / 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 simulation of the assembly - data

The following information represent the outcome of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Real-world parameters may differ. Use these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - characteristics
MP 25x13x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
 warning
1 mm 5310 Gs
531.0 mT
 3.50 kg / 7.71 lbs
3497.4 g / 34.3 N
 warning
2 mm 4846 Gs
484.6 mT
 2.91 kg / 6.42 lbs
2912.4 g / 28.6 N
 warning
3 mm 4397 Gs
439.7 mT
 2.40 kg / 5.29 lbs
2398.5 g / 23.5 N
 warning
5 mm 3576 Gs
357.6 mT
 1.59 kg / 3.50 lbs
1586.2 g / 15.6 N
 safe
10 mm 2073 Gs
207.3 mT
 0.53 kg / 1.17 lbs
532.9 g / 5.2 N
 safe
15 mm 1231 Gs
123.1 mT
 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
 safe
20 mm 773 Gs
77.3 mT
 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
 safe
30 mm 356 Gs
35.6 mT
 0.02 kg / 0.03 lbs
15.7 g / 0.2 N
 safe
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.00 lbs
1.6 g / 0.0 N
 safe
Magnetic force drops significantly per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, varnish, dust) strongly weakens the grip. Magnetic products hold strongest at the point of direct contact; gap weakens the force. Observe how quickly the load capacity plummet, when the magnet does not adhere directly to the steel surface. When calculating the assembly, avoid redundant distances.

Table 2: Vertical hold (vertical surface)
MP 25x13x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.83 kg / 1.83 lbs
828.0 g / 8.1 N
1 mm Stal (~0.2) 0.70 kg / 1.54 lbs
700.0 g / 6.9 N
2 mm Stal (~0.2) 0.58 kg / 1.28 lbs
582.0 g / 5.7 N
3 mm Stal (~0.2) 0.48 kg / 1.06 lbs
480.0 g / 4.7 N
5 mm Stal (~0.2) 0.32 kg / 0.70 lbs
318.0 g / 3.1 N
10 mm Stal (~0.2) 0.11 kg / 0.23 lbs
106.0 g / 1.0 N
15 mm Stal (~0.2) 0.04 kg / 0.08 lbs
38.0 g / 0.4 N
20 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section defines the approximate shear load required to cause the slippage of the magnet down along a vertical steel plate (assuming standard friction). This value depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x13x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 2.74 lbs
1242.0 g / 12.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.83 kg / 1.83 lbs
828.0 g / 8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 0.91 lbs
414.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.07 kg / 4.56 lbs
2070.0 g / 20.3 N
When mounting a element on a upright surface (e.g., a fridge), it will only hold only approx. 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip cause that holders slide down easier than they detach. Designing a hanger? Remember that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slide down under a noticeably lighter cargo. Utilizing a rubberized layer can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
MP 25x13x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.41 kg / 0.91 lbs
414.0 g / 4.1 N
1 mm
25%
 1.04 kg / 2.28 lbs
1035.0 g / 10.2 N
2 mm
50%
 2.07 kg / 4.56 lbs
2070.0 g / 20.3 N
3 mm
75%
 3.10 kg / 6.85 lbs
3105.0 g / 30.5 N
5 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
10 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
11 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
12 mm
100%
 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
A too thin steel cannot take in the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To squeeze 100% of this magnet's potential, you require a sufficiently solid piece of steel. The saturation effect causes that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MP 25x13x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
 OK
40 °C -2.2% 4.05 kg / 8.93 lbs
4048.9 g / 39.7 N
 OK
60 °C -4.4% 3.96 kg / 8.73 lbs
3957.8 g / 38.8 N
 OK
80 °C -6.6% 3.87 kg / 8.52 lbs
3866.8 g / 37.9 N
100 °C -28.8% 2.95 kg / 6.50 lbs
2947.7 g / 28.9 N
Standard neodymium magnets change their properties power after exceeding the maximum temperature. Avoid high temperatures – heat can permanently destroy this product. As the temperature rises, the neodymium's power momentarily lowers. Do not use this magnet close to ovens exceeding its safe range. Too high temperature will result in destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 25x13x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 83.66 kg / 184.44 lbs
6 082 Gs
12.55 kg / 27.67 lbs
12549 g / 123.1 N
 N/A
1 mm 77.09 kg / 169.95 lbs
11 091 Gs
11.56 kg / 25.49 lbs
11563 g / 113.4 N
 69.38 kg / 152.95 lbs
~0 Gs
2 mm 70.68 kg / 155.81 lbs
10 620 Gs
10.60 kg / 23.37 lbs
10601 g / 104.0 N
 63.61 kg / 140.23 lbs
~0 Gs
3 mm 64.59 kg / 142.40 lbs
10 153 Gs
9.69 kg / 21.36 lbs
9689 g / 95.0 N
 58.13 kg / 128.16 lbs
~0 Gs
5 mm 53.48 kg / 117.90 lbs
9 238 Gs
8.02 kg / 17.68 lbs
8022 g / 78.7 N
 48.13 kg / 106.11 lbs
~0 Gs
10 mm 32.05 kg / 70.66 lbs
7 152 Gs
4.81 kg / 10.60 lbs
4808 g / 47.2 N
 28.85 kg / 63.60 lbs
~0 Gs
20 mm 10.77 kg / 23.74 lbs
4 145 Gs
1.62 kg / 3.56 lbs
1615 g / 15.8 N
 9.69 kg / 21.37 lbs
~0 Gs
50 mm 0.66 kg / 1.45 lbs
1 024 Gs
0.10 kg / 0.22 lbs
99 g / 1.0 N
 0.59 kg / 1.30 lbs
~0 Gs
60 mm 0.32 kg / 0.70 lbs
712 Gs
0.05 kg / 0.10 lbs
48 g / 0.5 N
 0.29 kg / 0.63 lbs
~0 Gs
70 mm 0.17 kg / 0.36 lbs
514 Gs
0.02 kg / 0.05 lbs
25 g / 0.2 N
 0.15 kg / 0.33 lbs
~0 Gs
80 mm 0.09 kg / 0.20 lbs
383 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.08 kg / 0.18 lbs
~0 Gs
90 mm 0.05 kg / 0.12 lbs
293 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
230 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.07 lbs
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of performance. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the collision energy is massive. The levitation is marginally weaker than the attraction, but still large.
*Field value in repulsion mode drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Attention: Calculations show shear force of dual same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MP 25x13x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 17.0 cm
Hearing aid 10 Gs (1.0 mT) 13.5 cm
Mechanical watch 20 Gs (2.0 mT) 10.5 cm
Mobile device 40 Gs (4.0 mT) 8.0 cm
Car key 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field poses a serious hazard to IT equipment and pacemakers. These magnets generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation passes through tissues and plastic. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MP 25x13x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.33 km/h
(5.93 m/s)
 0.19 J
30 mm 34.38 km/h
(9.55 m/s)
 0.49 J
50 mm 44.29 km/h
(12.30 m/s)
 0.81 J
100 mm 62.62 km/h
(17.39 m/s)
 1.62 J
NdFeB products are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can cause material chips or injury to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Surface protection spec
MP 25x13x4 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MP 25x13x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 861 Mx 248.6 µWb
Pc Coefficient 1.02 High (Stable)
Total magnetic flux passing through the pole surface. Essential parameter for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 25x13x4 / N38

Environment Effective steel pull Effect
Air (land) 4.14 kg Standard
Water (riverbed) 4.74 kg
(+0.60 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds only ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.02

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.

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%
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: 030190-2026
Magnet Unit Converter
Force (pull)
Field Strength
Put a figure in just one slot to see the conversion in the other fields right away.

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The ring-shaped magnet MP 25x13x4 / N38 is created for mechanical fastening, 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 4.14 kg works great as a cabinet closure, 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. The flat screw head should evenly press the magnet. 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 indoor 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 (25 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 4 mm. The pulling force of this model is an impressive 4.14 kg, which translates to 40.57 N in newtons. The mounting hole diameter is precisely 13 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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They do not lose magnetism, even after around 10 years – the drop in strength is only ~1% (according to tests),
  • Magnets very well resist against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the reflective finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
  • Magnets possess exceptionally strong magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • In view of the possibility of free shaping and customization to unique projects, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which expands the range of possible applications,
  • Fundamental importance in high-tech industry – they are used in mass storage devices, motor assemblies, precision medical tools, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We recommend a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, small elements of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force is the result of a measurement for ideal contact conditions, assuming:
  • using a sheet made of mild steel, acting as a circuit closing element
  • with a cross-section no less than 10 mm
  • characterized by even structure
  • under conditions of gap-free contact (metal-to-metal)
  • during pulling in a direction vertical to the plane
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

Bear in mind that the working load may be lower subject to elements below, starting with the most relevant:
  • Distance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the holding force.

Warnings
Do not give to children

Always store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are life-threatening.

Powerful field

Handle with care. Neodymium magnets act from a distance and connect with huge force, often faster than you can react.

Danger to pacemakers

Individuals with a pacemaker have to keep an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

Do not drill into magnets

Drilling and cutting of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

GPS Danger

GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Hand protection

Pinching hazard: The attraction force is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Material brittleness

NdFeB magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets leads to them shattering into small pieces.

Nickel coating and allergies

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact and opt for coated magnets.

Demagnetization risk

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. This process is irreversible.

Protect data

Do not bring magnets close to a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Important! Need more info? Check our post: Why are neodymium magnets dangerous?