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MP 25x7.5/4.5x5 / N38 - ring magnet

ring magnet

Catalog no 030194

GTIN/EAN: 5906301812111

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

7.5/4.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

17.81 g

Magnetization Direction

↑ axial

Load capacity

7.72 kg / 75.69 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

view parameters »

8.00 ZŁ with VAT / pcs + price for transport

6.50 ZŁ net + 23% VAT / pcs

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Physical properties - MP 25x7.5/4.5x5 / N38 - ring magnet

Specification / characteristics - MP 25x7.5/4.5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030194
GTIN/EAN 5906301812111
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 7.5/4.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 17.81 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.72 kg / 75.69 N
Magnetic Induction ~ ? 230.20 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x7.5/4.5x5 / 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 simulation of the product - data

Presented data constitute the direct effect of a engineering analysis. Values rely on models for the material Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MP 25x7.5/4.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1995 Gs
199.5 mT
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
 warning
1 mm 1906 Gs
190.6 mT
 7.05 kg / 15.54 lbs
7049.4 g / 69.2 N
 warning
2 mm 1793 Gs
179.3 mT
 6.24 kg / 13.75 lbs
6236.8 g / 61.2 N
 warning
3 mm 1664 Gs
166.4 mT
 5.37 kg / 11.84 lbs
5368.9 g / 52.7 N
 warning
5 mm 1385 Gs
138.5 mT
 3.72 kg / 8.21 lbs
3722.8 g / 36.5 N
 warning
10 mm 788 Gs
78.8 mT
 1.20 kg / 2.65 lbs
1203.8 g / 11.8 N
 low risk
15 mm 437 Gs
43.7 mT
 0.37 kg / 0.82 lbs
370.3 g / 3.6 N
 low risk
20 mm 253 Gs
25.3 mT
 0.12 kg / 0.27 lbs
124.5 g / 1.2 N
 low risk
30 mm 101 Gs
10.1 mT
 0.02 kg / 0.04 lbs
19.8 g / 0.2 N
 low risk
50 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 lbs
1.4 g / 0.0 N
 low risk
Grip strength drops drastically with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets hold most effectively in perfect adhesion; gap weakens the power. Observe how rapidly the load capacity drop, when the product does not adhere directly to the steel surface. When calculating the mounting, eliminate additional spacers.

Table 2: Vertical load (vertical surface)
MP 25x7.5/4.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.54 kg / 3.40 lbs
1544.0 g / 15.1 N
1 mm Stal (~0.2) 1.41 kg / 3.11 lbs
1410.0 g / 13.8 N
2 mm Stal (~0.2) 1.25 kg / 2.75 lbs
1248.0 g / 12.2 N
3 mm Stal (~0.2) 1.07 kg / 2.37 lbs
1074.0 g / 10.5 N
5 mm Stal (~0.2) 0.74 kg / 1.64 lbs
744.0 g / 7.3 N
10 mm Stal (~0.2) 0.24 kg / 0.53 lbs
240.0 g / 2.4 N
15 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 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 estimated force sufficient to initiate the downward movement of the magnet vertically against a upright metal surface (considering standard friction coefficient). The holding force varies with the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x7.5/4.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.32 kg / 5.11 lbs
2316.0 g / 22.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.54 kg / 3.40 lbs
1544.0 g / 15.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.77 kg / 1.70 lbs
772.0 g / 7.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.86 kg / 8.51 lbs
3860.0 g / 37.9 N
When mounting a element on a vertical plane (e.g., a board), it will only hold only approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient cause that holders move down easier than they detach. Planning a vertical fastening? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a much lighter weight. Using a rubber pad can significantly improve the result.

Table 4: Steel thickness (saturation) - power losses
MP 25x7.5/4.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.77 kg / 1.70 lbs
772.0 g / 7.6 N
1 mm
25%
 1.93 kg / 4.25 lbs
1930.0 g / 18.9 N
2 mm
50%
 3.86 kg / 8.51 lbs
3860.0 g / 37.9 N
3 mm
75%
 5.79 kg / 12.76 lbs
5790.0 g / 56.8 N
5 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
10 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
11 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
12 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
A thin metal plate is unable to focus the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the attraction force will be weaker. To squeeze 100% of this magnet's potential, you need a suitably thick backing of steel. The saturation effect means that on delicate walls (e.g., thin profiles), the holder holds weaker. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MP 25x7.5/4.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
 OK
40 °C -2.2% 7.55 kg / 16.65 lbs
7550.2 g / 74.1 N
 OK
60 °C -4.4% 7.38 kg / 16.27 lbs
7380.3 g / 72.4 N
80 °C -6.6% 7.21 kg / 15.90 lbs
7210.5 g / 70.7 N
100 °C -28.8% 5.50 kg / 12.12 lbs
5496.6 g / 53.9 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can permanently damage this magnet. With every degree above norm, the magnet's power momentarily decreases. Avoid using this magnet near heat sources higher than its safe range. Ignoring the limit will result in irreversible degradation of magnetism.
*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 25x7.5/4.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.91 kg / 21.84 lbs
3 484 Gs
1.49 kg / 3.28 lbs
1486 g / 14.6 N
 N/A
1 mm 9.51 kg / 20.96 lbs
3 909 Gs
1.43 kg / 3.14 lbs
1426 g / 14.0 N
 8.56 kg / 18.87 lbs
~0 Gs
2 mm 9.05 kg / 19.94 lbs
3 813 Gs
1.36 kg / 2.99 lbs
1357 g / 13.3 N
 8.14 kg / 17.95 lbs
~0 Gs
3 mm 8.54 kg / 18.83 lbs
3 705 Gs
1.28 kg / 2.82 lbs
1281 g / 12.6 N
 7.69 kg / 16.94 lbs
~0 Gs
5 mm 7.45 kg / 16.42 lbs
3 460 Gs
1.12 kg / 2.46 lbs
1117 g / 11.0 N
 6.70 kg / 14.78 lbs
~0 Gs
10 mm 4.78 kg / 10.53 lbs
2 771 Gs
0.72 kg / 1.58 lbs
717 g / 7.0 N
 4.30 kg / 9.48 lbs
~0 Gs
20 mm 1.54 kg / 3.41 lbs
1 576 Gs
0.23 kg / 0.51 lbs
232 g / 2.3 N
 1.39 kg / 3.06 lbs
~0 Gs
50 mm 0.06 kg / 0.13 lbs
312 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.05 kg / 0.12 lbs
~0 Gs
60 mm 0.03 kg / 0.06 lbs
202 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
70 mm 0.01 kg / 0.03 lbs
138 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
80 mm 0.01 kg / 0.01 lbs
97 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.01 lbs
71 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
54 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 magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of operation. Planning to create a solid fastener? Apply two 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 marginally weaker than the attraction, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Estimates apply to shear force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MP 25x7.5/4.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.5 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Timepiece 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a serious hazard to electronics as well as pacemakers. These magnets produce a field that destroys function of digital equipment. Be aware: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MP 25x7.5/4.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.95 km/h
(6.38 m/s)
 0.36 J
30 mm 36.43 km/h
(10.12 m/s)
 0.91 J
50 mm 46.96 km/h
(13.04 m/s)
 1.52 J
100 mm 66.40 km/h
(18.44 m/s)
 3.03 J
Magnetic elements are delicate – a collision with steel can result in shattering. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Surface protection spec
MP 25x7.5/4.5x5 / 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 following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MP 25x7.5/4.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 759 Mx 97.6 µWb
Pc Coefficient 0.25 Low (Flat)
Flux value emitted by the pole surface. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Submerged application
MP 25x7.5/4.5x5 / N38

Environment Effective steel pull Effect
Air (land) 7.72 kg Standard
Water (riverbed) 8.84 kg
(+1.12 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!
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains just ~20% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely 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) = 0.25

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%
Sustainability
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: 030194-2026
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The ring-shaped magnet MP 25x7.5/4.5x5 / 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 25x7.5/4.5x5 / 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. 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.
A screw or bolt with a thread diameter smaller than 7.5/4.5 mm fits this model. 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.
It is a magnetic ring with a diameter of 25 mm and thickness 5 mm. The pulling force of this model is an impressive 7.72 kg, which translates to 75.69 N in newtons. The mounting hole diameter is precisely 7.5/4.5 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.

Advantages and disadvantages of rare earth magnets.

Pros

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • They show high resistance to demagnetization induced by external field influence,
  • A magnet with a smooth gold surface looks better,
  • Magnets are distinguished by excellent magnetic induction on the working surface,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in shaping and the capacity to adapt to specific needs,
  • Wide application in high-tech industry – they serve a role in mass storage devices, motor assemblies, medical equipment, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

Limitations

Cons of neodymium magnets: application proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets decrease 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of creating nuts in the magnet and complex shapes - preferred is cover - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The lifting capacity listed is a measurement result executed under standard conditions:
  • using a base made of high-permeability steel, acting as a ideal flux conductor
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Please note that the working load may be lower influenced by elements below, in order of importance:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel type – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit 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 lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safe handling of neodymium magnets
Nickel coating and allergies

It is widely known that nickel (the usual finish) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or opt for versions in plastic housing.

Magnetic media

Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Fire warning

Powder created during machining of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Precision electronics

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

Choking Hazard

These products are not intended for children. Eating a few magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.

Warning for heart patients

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

Crushing risk

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Respect the power

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

Magnet fragility

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

Maximum temperature

Keep cool. Neodymium magnets are susceptible to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?