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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 parameters »

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Technical details - 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 analysis of the magnet - technical parameters

These values represent the direct effect of a engineering simulation. Results are based on algorithms for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - interaction chart
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
 safe
15 mm 437 Gs
43.7 mT
 0.37 kg / 0.82 LBS
370.3 g / 3.6 N
 safe
20 mm 253 Gs
25.3 mT
 0.12 kg / 0.27 LBS
124.5 g / 1.2 N
 safe
30 mm 101 Gs
10.1 mT
 0.02 kg / 0.04 LBS
19.8 g / 0.2 N
 safe
50 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 LBS
1.4 g / 0.0 N
 safe
Grip strength drops drastically per each millimeter of spacing. Remember that even a very thin break (e.g., dirt, paint, rust) strongly diminishes the holding power. Magnetic products operate optimally during direct contact; distance weakens the power. Analyze how flashily the pull force fall, when the magnet does not adhere directly to the metal substrate. When calculating the mounting, discard unnecessary gaps.

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
The following data shows the approximate shear load necessary to start the shifting of the magnet downwards along a vertical metal surface (considering typical friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 placing a element on a upright wall (e.g., a board), it will only hold just approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient mean that holders move down faster than they detach. Planning a wall mount? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slip down under a much lighter cargo. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
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 cannot conduct the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of metal. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the magnet works worse. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - 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 change their properties strength after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this product. As the temperature rises, the magnet's power temporarily decreases. Do not use this product close to ovens higher than its working range. Ignoring the limit will lead to destruction of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MP 25x7.5/4.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 magnets interact from a much further distance than a neodymium and metal setup. The setup of magnet-to-magnet produces a massive flux and a further horizon of operation. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the impact force is huge. The repulsion force is marginally weaker than the attraction, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Figures apply to friction force of two same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (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
Mechanical watch 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 is a serious hazard to IT equipment as well as pacemakers. These NdFeB products produce a field that destroys function of digital equipment. Notice: the unseen radiation acts through matter and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (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 very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or painful pinches to fingers. Always hold the magnet during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when working 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. 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 magnet pole. Key data in coil applications and motors. The Pc coefficient defines the magnet's operating point.

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!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Steel saturation

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

3. Temperature resistance

*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) = 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
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: 030194-2026
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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 cabinet closure, 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. It's a good idea to use a flexible washer 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.
The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 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. 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 and disadvantages of neodymium magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • By using a smooth coating of silver, the element presents an proper look,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of accurate machining and adapting to atypical applications,
  • Wide application in future technologies – they find application in hard drives, motor assemblies, advanced medical instruments, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

What to avoid - cons of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complex forms - recommended is cover - mounting mechanism.
  • 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, tiny parts of these products are able to disrupt the diagnostic process 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 magnetic pulling force – what contributes to it?

Holding force of 7.72 kg is a result of laboratory testing performed under standard conditions:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a surface free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • in stable room temperature

Determinants of practical lifting force of a magnet

Bear in mind that the working load will differ depending on the following factors, starting with the most relevant:
  • Distance (between the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Plate material – mild steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. In addition, even a small distance between the magnet and the plate lowers the load capacity.

Warnings
Health Danger

Individuals with a ICD should maintain an large gap from magnets. The magnetic field can interfere with the functioning of the implant.

Shattering risk

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them breaking into shards.

No play value

Only for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store away from kids and pets.

Electronic devices

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

Phone sensors

Be aware: neodymium magnets generate a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and GPS.

Respect the power

Be careful. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can react.

Bone fractures

Big blocks can crush fingers instantly. Do not place your hand between two strong magnets.

Combustion hazard

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Metal Allergy

Certain individuals have a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Frequent touching might lead to an allergic reaction. We suggest use protective gloves.

Permanent damage

Control the heat. Heating the magnet to high heat will destroy its magnetic structure and pulling force.

Caution! Learn more about hazards in the article: Safety of working with magnets.