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MP 25x12.5x5 / N38 - ring magnet

ring magnet

Catalog no 030342

GTIN/EAN: 5906301812289

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

12.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

13.81 g

Magnetization Direction

↑ axial

Load capacity

5.98 kg / 58.64 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

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6.20 ZŁ with VAT / pcs + price for transport

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Technical specification - MP 25x12.5x5 / N38 - ring magnet

Specification / characteristics - MP 25x12.5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030342
GTIN/EAN 5906301812289
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 12.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 13.81 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.98 kg / 58.64 N
Magnetic Induction ~ ? 230.20 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x12.5x5 / 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

Engineering simulation of the product - technical parameters

The following values constitute the outcome of a engineering calculation. Values were calculated on models for the class Nd2Fe14B. Real-world conditions may differ. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
MP 25x12.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 5.98 kg / 13.18 pounds
5980.0 g / 58.7 N
 strong
1 mm 5310 Gs
531.0 mT
 5.05 kg / 11.14 pounds
5051.8 g / 49.6 N
 strong
2 mm 4846 Gs
484.6 mT
 4.21 kg / 9.27 pounds
4206.8 g / 41.3 N
 strong
3 mm 4397 Gs
439.7 mT
 3.46 kg / 7.64 pounds
3464.5 g / 34.0 N
 strong
5 mm 3576 Gs
357.6 mT
 2.29 kg / 5.05 pounds
2291.1 g / 22.5 N
 strong
10 mm 2073 Gs
207.3 mT
 0.77 kg / 1.70 pounds
769.7 g / 7.6 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.27 kg / 0.60 pounds
271.6 g / 2.7 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.11 kg / 0.24 pounds
106.9 g / 1.0 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.02 kg / 0.05 pounds
22.7 g / 0.2 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.01 pounds
2.4 g / 0.0 N
 weak grip
Pulling power weakens drastically per each millimeter of spacing. Note that every additional insulation layer (e.g., contamination, paint, rust) significantly diminishes the holding power. Neodymiums operate strongest in perfect adhesion; air break kills the power. Notice how rapidly the pull force plummet, when the product does not touch flatly to the metal substrate. When calculating the arrangement, eliminate unnecessary gaps.

Table 2: Sliding force (wall)
MP 25x12.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.20 kg / 2.64 pounds
1196.0 g / 11.7 N
1 mm Stal (~0.2) 1.01 kg / 2.23 pounds
1010.0 g / 9.9 N
2 mm Stal (~0.2) 0.84 kg / 1.86 pounds
842.0 g / 8.3 N
3 mm Stal (~0.2) 0.69 kg / 1.53 pounds
692.0 g / 6.8 N
5 mm Stal (~0.2) 0.46 kg / 1.01 pounds
458.0 g / 4.5 N
10 mm Stal (~0.2) 0.15 kg / 0.34 pounds
154.0 g / 1.5 N
15 mm Stal (~0.2) 0.05 kg / 0.12 pounds
54.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section indicates the estimated weight limit required to cause the sliding of the magnet downwards on a vertical steel plate (assuming typical friction). The holding force is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 25x12.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.79 kg / 3.96 pounds
1794.0 g / 17.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.20 kg / 2.64 pounds
1196.0 g / 11.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.60 kg / 1.32 pounds
598.0 g / 5.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.99 kg / 6.59 pounds
2990.0 g / 29.3 N
When hanging a magnet on a upright plane (e.g., a fridge), it will only hold only about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip mean that holders move down faster than they pop off the substrate. Want to create a wall mount? Note that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will slide down under a significantly smaller cargo. Application of an anti-slip coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MP 25x12.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.60 kg / 1.32 pounds
598.0 g / 5.9 N
1 mm
25%
 1.50 kg / 3.30 pounds
1495.0 g / 14.7 N
2 mm
50%
 2.99 kg / 6.59 pounds
2990.0 g / 29.3 N
3 mm
75%
 4.49 kg / 9.89 pounds
4485.0 g / 44.0 N
5 mm
100%
 5.98 kg / 13.18 pounds
5980.0 g / 58.7 N
10 mm
100%
 5.98 kg / 13.18 pounds
5980.0 g / 58.7 N
11 mm
100%
 5.98 kg / 13.18 pounds
5980.0 g / 58.7 N
12 mm
100%
 5.98 kg / 13.18 pounds
5980.0 g / 58.7 N
A too thin steel is unable to conduct the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To squeeze 100% of this magnet's power, you need a suitably thick backing of steel. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the product works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MP 25x12.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.98 kg / 13.18 pounds
5980.0 g / 58.7 N
 OK
40 °C -2.2% 5.85 kg / 12.89 pounds
5848.4 g / 57.4 N
 OK
60 °C -4.4% 5.72 kg / 12.60 pounds
5716.9 g / 56.1 N
 OK
80 °C -6.6% 5.59 kg / 12.31 pounds
5585.3 g / 54.8 N
100 °C -28.8% 4.26 kg / 9.39 pounds
4257.8 g / 41.8 N
Standard neodymium magnets change their properties parameters after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently destroy this magnet. As the temperature rises, the neodymium's force momentarily decreases. Avoid using this magnet in hot environments higher than its operating temperature limit. Too high temperature will lead to destruction of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently under lower heat stress compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MP 25x12.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 82.42 kg / 181.72 pounds
6 082 Gs
12.36 kg / 27.26 pounds
12364 g / 121.3 N
 N/A
1 mm 75.95 kg / 167.44 pounds
11 091 Gs
11.39 kg / 25.12 pounds
11392 g / 111.8 N
 68.35 kg / 150.69 pounds
~0 Gs
2 mm 69.63 kg / 153.51 pounds
10 620 Gs
10.44 kg / 23.03 pounds
10445 g / 102.5 N
 62.67 kg / 138.16 pounds
~0 Gs
3 mm 63.64 kg / 140.29 pounds
10 153 Gs
9.55 kg / 21.04 pounds
9545 g / 93.6 N
 57.27 kg / 126.26 pounds
~0 Gs
5 mm 52.69 kg / 116.16 pounds
9 238 Gs
7.90 kg / 17.42 pounds
7903 g / 77.5 N
 47.42 kg / 104.54 pounds
~0 Gs
10 mm 31.58 kg / 69.62 pounds
7 152 Gs
4.74 kg / 10.44 pounds
4737 g / 46.5 N
 28.42 kg / 62.66 pounds
~0 Gs
20 mm 10.61 kg / 23.39 pounds
4 145 Gs
1.59 kg / 3.51 pounds
1591 g / 15.6 N
 9.55 kg / 21.05 pounds
~0 Gs
50 mm 0.65 kg / 1.43 pounds
1 024 Gs
0.10 kg / 0.21 pounds
97 g / 1.0 N
 0.58 kg / 1.28 pounds
~0 Gs
60 mm 0.31 kg / 0.69 pounds
712 Gs
0.05 kg / 0.10 pounds
47 g / 0.5 N
 0.28 kg / 0.62 pounds
~0 Gs
70 mm 0.16 kg / 0.36 pounds
514 Gs
0.02 kg / 0.05 pounds
24 g / 0.2 N
 0.15 kg / 0.32 pounds
~0 Gs
80 mm 0.09 kg / 0.20 pounds
383 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
 0.08 kg / 0.18 pounds
~0 Gs
90 mm 0.05 kg / 0.12 pounds
293 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
100 mm 0.03 kg / 0.07 pounds
230 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
Two magnets interact from a significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of performance. Designing a strong closure? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the impact force is massive. The levitation is slightly lower than the attraction, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Attention: Calculations demonstrate friction force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MP 25x12.5x5 / 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
Extremely neodym field poses a real danger to electronic devices as well as medical implants. These magnets generate a flux that destroys function of digital equipment. Remember: the unseen radiation passes through tissues and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MP 25x12.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.61 km/h
(6.28 m/s)
 0.27 J
30 mm 36.44 km/h
(10.12 m/s)
 0.71 J
50 mm 46.94 km/h
(13.04 m/s)
 1.17 J
100 mm 66.37 km/h
(18.43 m/s)
 2.35 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (durability)
MP 25x12.5x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MP 25x12.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 536 Mx 245.4 µWb
Pc Coefficient 1.03 High (Stable)
Flux value emitted by the pole surface. Essential parameter for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MP 25x12.5x5 / N38

Environment Effective steel pull Effect
Air (land) 5.98 kg Standard
Water (riverbed) 6.85 kg
(+0.87 kg buoyancy gain)
+14.5%
Warning: 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. Wall mount (shear)

*Note: On a vertical wall, the magnet holds only a fraction of its max power.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.

3. Thermal stability

*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) = 1.03

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 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%
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: 030342-2026
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The ring-shaped magnet MP 25x12.5x5 / 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 5.98 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 25x12.5x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
A screw or bolt with a thread diameter smaller than 12.5 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.
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 5.98 kg, which translates to 58.64 N in newtons. The mounting hole diameter is precisely 12.5 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (theoretically),
  • They show high resistance to demagnetization induced by external field influence,
  • By covering with a decorative coating of nickel, the element acquires an elegant look,
  • Magnets exhibit huge magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of custom shaping and adjusting to precise requirements,
  • Huge importance in future technologies – they find application in data components, drive modules, medical devices, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Cons

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The specified lifting capacity represents the limit force, measured under ideal test conditions, specifically:
  • on a plate made of mild steel, effectively closing the magnetic flux
  • with a cross-section minimum 10 mm
  • with an polished touching surface
  • without the slightest clearance between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

In practice, the real power is determined by several key aspects, presented from the most important:
  • Clearance – the presence of any layer (paint, tape, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Steel thickness – too thin plate does not accept the full field, causing part of the flux to be escaped to the other side.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Life threat

Medical warning: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Electronic hazard

Do not bring magnets close to a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

GPS Danger

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Powerful field

Use magnets consciously. Their powerful strength can shock even experienced users. Stay alert and do not underestimate their force.

Avoid contact if allergic

Some people experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Frequent touching might lead to dermatitis. It is best to use safety gloves.

Permanent damage

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Keep away from children

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.

Protective goggles

Neodymium magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them shattering into small pieces.

Flammability

Fire hazard: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Hand protection

Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Important! Need more info? Check our post: Are neodymium magnets dangerous?