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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

technical parameters »

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Product card - 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

Physical analysis of the product - data

Presented information constitute the result of a physical analysis. Values are based on models for the material Nd2Fe14B. Real-world parameters may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull 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
 strong
1 mm 5310 Gs
531.0 mT
 3.50 kg / 7.71 LBS
3497.4 g / 34.3 N
 strong
2 mm 4846 Gs
484.6 mT
 2.91 kg / 6.42 LBS
2912.4 g / 28.6 N
 strong
3 mm 4397 Gs
439.7 mT
 2.40 kg / 5.29 LBS
2398.5 g / 23.5 N
 strong
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
Grip strength drops significantly with every mm of distance. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) strongly weakens the grip. Magnetic products operate optimally in perfect adhesion; air break weakens the power. Notice how rapidly the pull force drop, when the product does not touch tightly to the steel surface. When designing the mounting, eliminate unnecessary gaps.

Table 2: Slippage force (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 shows the estimated force needed to initiate the slippage of the magnet down on a upright metal surface (considering typical friction coefficient). This value is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
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 holder on a upright surface (e.g., a fridge), it will only hold barely about 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that holders slip easier than they detach. Planning a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will give way down under a much lighter load. Using a rubber layer can effectively improve the result.

Table 4: Steel thickness (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 thin metal plate is unable to absorb the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's power, you require a sufficiently solid backing of metal. The material oversaturation causes that on thin elements (e.g., appliance housings), the magnet holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - power drop
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
Classic neodymiums irreversibly lose strength after exceeding the maximum temperature. Protect against heat – heat can permanently damage this magnet. With increasing heat, the magnet's capacity temporarily lowers. Refrain from using this product close to ovens exceeding its safe range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
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 wider radius than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Designing a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is huge. The levitation is marginally weaker than the attraction, but still large.
*Flux density in repulsion mode drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Note: Figures demonstrate shear force of two identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - 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
Remote 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 electronics as well as medical implants. These neodymiums generate a field that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and plastic. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
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
Magnetic elements are delicate – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when working with large magnets.

Table 9: Corrosion resistance
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)
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 25x13x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 861 Mx 248.6 µWb
Pc Coefficient 1.02 High (Stable)
Flux value passing through the pole surface. Essential parameter in coil applications and motors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds only ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For N38 grade, the safety 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%
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: 030190-2026
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The ring magnet with a hole 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. 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 25x13x4 / 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. 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. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 13 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 25 mm and thickness 4 mm. The key parameter here is the lifting capacity amounting to approximately 4.14 kg (force ~40.57 N). 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. 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 as well as disadvantages of neodymium magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their magnetic field is durable, and after around 10 years it drops only by ~1% (theoretically),
  • Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by external magnetic fields,
  • Thanks to the shimmering finish, the layer of nickel, gold-plated, or silver-plated gives an modern appearance,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of individual forming and adapting to concrete requirements,
  • Wide application in modern technologies – they are used in data components, electric motors, medical devices, also other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • 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

Magnetic strength at its maximum – what affects it?

The lifting capacity listed is a measurement result performed under standard conditions:
  • with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
  • whose transverse dimension is min. 10 mm
  • with an polished contact surface
  • without any air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Holding efficiency is affected by specific conditions, mainly (from most important):
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
  • Surface finish – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

Warnings
Avoid contact if allergic

It is widely known that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, avoid direct skin contact or choose coated magnets.

Handling guide

Use magnets with awareness. Their huge power can surprise even experienced users. Stay alert and respect their power.

Phone sensors

Remember: rare earth magnets produce a field that interferes with precision electronics. Keep a separation from your mobile, device, and GPS.

Fragile material

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Flammability

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Product not for children

These products are not intended for children. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates urgent medical intervention.

Maximum temperature

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

ICD Warning

Warning for patients: Powerful magnets affect medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Safe distance

Intense magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Physical harm

Large magnets can break fingers instantly. Never put your hand between two attracting surfaces.

Caution! Want to know more? Check our post: Why are neodymium magnets dangerous?