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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

technical details »

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Parameters along with shape of a neodymium magnet can be estimated on our magnetic mass calculator.

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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

Physical modeling of the product - data

The following information represent the outcome of a physical calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational conditions may differ. Use these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - power drop
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
Magnetic force decreases significantly per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., contamination, varnish, rust) strongly diminishes the holding power. Magnetic products operate most effectively during direct contact; air break kills the power. Notice how flashily the load capacity plummet, when the magnet does not touch directly to the steel surface. When planning the mounting, avoid redundant distances.

Table 2: Sliding force (wall)
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
The following data shows the approximate weight limit sufficient to cause the downward movement of the magnet downwards against a upright steel plate (assuming standard friction). The holding force is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
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 placing a holder on a upright surface (e.g., a board), it will only hold only about 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient influence the fact that products move down easier than they detach. Planning a wall mount? Remember that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slip down under a significantly smaller load. Application of an anti-slip layer can significantly raise the stability.

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 too thin steel cannot absorb the full magnetic flux, which wastes potential of the magnet. Should you install a neodymium to a thin surface, the flux will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you need a suitably thick element of metal. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the holder works worse. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal stability (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
Ordinary NdFeB products lose power past the thermal threshold. Protect against heat – high temperature can permanently damage this magnet. As the temperature rises, the magnet's power temporarily drops. Avoid using this product close to ovens exceeding its operating temperature limit. Too high temperature will result in destruction of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Red status in the table signals a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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 setup. The connection of two magnets creates a more powerful interaction and a wider radius of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the impact force is huge. The levitation is marginally weaker than the attraction, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Figures demonstrate friction force of two matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - 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 large risk to IT equipment as well as pacemakers. These neodymiums produce a field that destroys function of digital equipment. Remember: the invisible magnetic field passes through tissues and glass. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near 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
Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

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)
Total magnetic flux passing through the pole surface. Key data in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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 specification and ecology
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: 030194-2026
Quick Unit Converter
Magnet pull force
Field Strength
Just populate a single box, to let the converter calculate the rest automatically.

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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Mounting is clean and reversible, unlike gluing. This product with a force of 7.72 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 25x7.5/4.5x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable 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.
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. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø25x5 mm and a weight of 17.81 g. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of rare earth magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • Their power remains stable, and after around 10 years it drops only by ~1% (theoretically),
  • They feature excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the top side of the magnet turns out to be maximum,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of exact machining and modifying to concrete conditions,
  • Key role in electronics industry – they are utilized in HDD drives, brushless drives, advanced medical instruments, as well as modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Cons of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

Holding force of 7.72 kg is a result of laboratory testing conducted under the following configuration:
  • on a block made of structural steel, optimally conducting the magnetic field
  • whose thickness is min. 10 mm
  • with a surface perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction vertical to the mounting surface
  • at temperature room level

Practical lifting capacity: influencing factors

Please note that the magnet holding may be lower depending on elements below, starting with the most relevant:
  • Distance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin sheet does not close the flux, causing part of the flux to be wasted into the air.
  • Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Precision electronics

An intense magnetic field interferes with the functioning of compasses in phones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.

Implant safety

Patients with a ICD should maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the implant.

Crushing risk

Pinching hazard: The pulling power is so immense that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and wear gloves.

Dust explosion hazard

Powder produced during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Danger to the youngest

Only for adults. Small elements can be swallowed, leading to serious injuries. Keep away from kids and pets.

Handling guide

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Operating temperature

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Safe distance

Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Protective goggles

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets leads to them cracking into small pieces.

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