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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 specifications »

6.77 ZŁ with VAT / pcs + price for transport

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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

Technical modeling of the magnet - data

Presented data represent the direct effect of a engineering calculation. Results rely on algorithms for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
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
 medium risk
1 mm 5310 Gs
531.0 mT
 3.50 kg / 7.71 LBS
3497.4 g / 34.3 N
 medium risk
2 mm 4846 Gs
484.6 mT
 2.91 kg / 6.42 LBS
2912.4 g / 28.6 N
 medium risk
3 mm 4397 Gs
439.7 mT
 2.40 kg / 5.29 LBS
2398.5 g / 23.5 N
 medium risk
5 mm 3576 Gs
357.6 mT
 1.59 kg / 3.50 LBS
1586.2 g / 15.6 N
 weak grip
10 mm 2073 Gs
207.3 mT
 0.53 kg / 1.17 LBS
532.9 g / 5.2 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.07 kg / 0.16 LBS
74.0 g / 0.7 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.02 kg / 0.03 LBS
15.7 g / 0.2 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.00 LBS
1.6 g / 0.0 N
 weak grip
Grip strength decreases significantly with every mm of gap. Remember that every additional insulation layer (e.g., dirt, paint, veneer) significantly reduces the pull force. Magnetic products operate strongest in perfect adhesion; air break kills the force. See how rapidly the pull force drop, when the product does not adhere tightly to the metal substrate. When planning the mounting, discard unnecessary gaps.

Table 2: Slippage 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
The following data presents the estimated shear load needed to initiate the slippage of the magnet downwards along a vertical steel wall (considering standard friction coefficient). This value is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 holder on a upright wall (e.g., a fridge), it you can count on just about 1/5 of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that holders move down faster than they pop off the substrate. Designing a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will slide down under a much lighter load. Utilizing a rubberized coating can effectively increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
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 cannot absorb the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To achieve full efficiency of this magnet's potential, you need a suitably thick backing of metal. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - 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
Ordinary NdFeB products lose power above the temperature limit. Avoid high temperatures – heat can irreversibly destroy this product. As the temperature rises, the neodymium's capacity temporarily decreases. Do not use this magnet close to heaters higher than its working range. Too high temperature will lead to destruction of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) may lose charge permanently sooner than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 25x13x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 attract each other from a much further distance than a neodymium and metal setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of action. Designing a solid fastener? Apply two magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the impact force is huge. The repulsion force is a bit weaker than the attraction, but still impressive.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Important: Figures refer to friction force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 10.5 cm
Phone / Smartphone 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
A strong magnetic field is a serious hazard to IT equipment as well as medical implants. These NdFeB products produce a flux that disrupts operation of digital equipment. Be aware: the unseen radiation acts through matter and glass. Increased vigilance must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - 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
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Anti-corrosion coating durability
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
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 when building generators and motors. The Pc coefficient determines the working geometry.

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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

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

2. Plate thickness effect

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

3. Heat tolerance

*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
Elemental analysis
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-shaped magnet MP 25x13x4 / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. This product with a force of 4.14 kg works great as a door latch, speaker holder, or spacer element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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. 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 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.
This model is characterized by dimensions Ø25x4 mm and a weight of 10.74 g. 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.
The poles are located on the planes with holes, not on the sides of the ring. 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.

Advantages as well as disadvantages of neodymium magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after around 10 years it drops only by ~1% (according to research),
  • They do not lose their magnetic properties even under external field action,
  • By using a decorative layer of gold, the element has an modern look,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Due to the possibility of flexible shaping and customization to individualized solutions, NdFeB magnets can be modeled in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Fundamental importance in advanced technology sectors – they are used in hard drives, drive modules, medical devices, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making threads in the magnet and complex shapes - preferred is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Detachment force of the magnet in optimal conditions – what contributes to it?

The declared magnet strength represents the peak performance, recorded under laboratory conditions, specifically:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a cross-section of at least 10 mm
  • with a plane perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

During everyday use, the real power depends on many variables, listed from most significant:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Handling rules

Be careful. Neodymium magnets attract from a distance and snap with huge force, often faster than you can move away.

Pacemakers

People with a pacemaker should keep an safe separation from magnets. The magnetism can interfere with the functioning of the life-saving device.

Magnetic interference

Navigation devices and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Keep away from computers

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Maximum temperature

Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Protective goggles

Neodymium magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.

Finger safety

Big blocks can crush fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Allergic reactions

It is widely known that nickel (the usual finish) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands and select versions in plastic housing.

Dust is flammable

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Adults only

These products are not intended for children. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which poses a severe health hazard and necessitates urgent medical intervention.

Attention! More info about risks in the article: Magnet Safety Guide.