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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

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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

Engineering modeling of the product - data

These information are the result of a physical analysis. Results are based on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - interaction chart
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
 warning
1 mm 5310 Gs
531.0 mT
 3.50 kg / 7.71 LBS
3497.4 g / 34.3 N
 warning
2 mm 4846 Gs
484.6 mT
 2.91 kg / 6.42 LBS
2912.4 g / 28.6 N
 warning
3 mm 4397 Gs
439.7 mT
 2.40 kg / 5.29 LBS
2398.5 g / 23.5 N
 warning
5 mm 3576 Gs
357.6 mT
 1.59 kg / 3.50 LBS
1586.2 g / 15.6 N
 low risk
10 mm 2073 Gs
207.3 mT
 0.53 kg / 1.17 LBS
532.9 g / 5.2 N
 low risk
15 mm 1231 Gs
123.1 mT
 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
 low risk
20 mm 773 Gs
77.3 mT
 0.07 kg / 0.16 LBS
74.0 g / 0.7 N
 low risk
30 mm 356 Gs
35.6 mT
 0.02 kg / 0.03 LBS
15.7 g / 0.2 N
 low risk
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.00 LBS
1.6 g / 0.0 N
 low risk
Magnetic force weakens drastically with every mm of distance. Keep in mind that even a microscopic distance (e.g., contamination, varnish, dust) significantly diminishes the holding power. Magnetic products work optimally in perfect adhesion; gap weakens the power. Notice how rapidly the pull force plummet, when the product does not adhere tightly to the steel surface. When planning the arrangement, avoid redundant distances.

Table 2: Sliding 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 table below shows the estimated shear load needed to initiate the shifting of the magnet down along a upright steel plate (assuming typical friction coefficient). This parameter is a function of the distance between the magnet and the metal.

Table 3: Wall mounting (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 magnet on a upright plane (e.g., a car body), it you can count on barely about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip mean that products slide down easier than they detach. Designing a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a noticeably lighter load. Application of an anti-slip coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - 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 conduct the entire magnetic field, which squanders power of the magnet. If you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To utilize the maximum of this neodymium's potential, you need a suitably thick element of metal. The material oversaturation means that on sheet metal structures (e.g., thin profiles), the product holds weaker. We advise picking the steel cross-section from these parameters.

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
Standard neodymium magnets lose power past the thermal threshold. Watch out for overheating – heat can irreversibly destroy this magnet. As the temperature rises, the neodymium's power briefly lowers. Do not use this product near heat sources exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetism.
*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MP 25x13x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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 strong neodymiums interact from a wider radius than a magnet and steel setup. The connection of two magnets generates a stronger field and a wider radius of performance. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is huge. The levitation is slightly lower than the connection force, but still impressive.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Attention: Figures show friction force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 10.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.0 cm
Remote 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 is a serious hazard to electronics as well as pacemakers. These magnets generate a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, 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
NdFeB products are very brittle – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or injury to skin. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when handling 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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 for generator designers and motors. The Pc coefficient determines the magnet's operating point.

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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) severely limits the holding force.

3. Temperature resistance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.02

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
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%
Ecology and recycling (GPSR)
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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Magnetic Induction
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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. Thanks to the hole (often for a screw), this model enables quick installation 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 25x13x4 / 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. 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. This product is dedicated for indoor 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. 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 4 mm. The pulling force of this model is an impressive 4.14 kg, which translates to 40.57 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 13 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of neodymium magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their magnetic field remains stable, and after approximately 10 years it drops only by ~1% (theoretically),
  • They have excellent resistance to magnetic field loss when exposed to external fields,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the option of free shaping and adaptation to custom needs, NdFeB magnets can be created in a wide range of forms and dimensions, which makes them more universal,
  • Key role in modern technologies – they serve a role in hard drives, motor assemblies, medical devices, also complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding 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 prevent oxidation as well as corrosion.
  • Limited ability of creating threads in the magnet and complex forms - recommended is a housing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, taking into account:
  • using a base made of high-permeability steel, functioning as a ideal flux conductor
  • whose transverse dimension reaches at least 10 mm
  • with an ground contact surface
  • under conditions of no distance (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding will differ influenced by the following factors, starting with the most relevant:
  • Clearance – the presence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Base massiveness – too thin steel does not accept the full field, causing part of the power to be wasted to the other side.
  • Material type – the best choice is pure iron steel. Hardened steels may attract less.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Demagnetization risk

Monitor thermal conditions. Heating the magnet to high heat will destroy its magnetic structure and strength.

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop working with magnets and use protective gear.

Product not for children

Always keep magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are fatal.

Caution required

Exercise caution. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can move away.

Medical implants

Patients with a heart stimulator must maintain an safe separation from magnets. The magnetism can stop the operation of the life-saving device.

Fire risk

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Protect data

Do not bring magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Magnetic interference

Be aware: neodymium magnets produce a field that confuses sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.

Serious injuries

Protect your hands. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Fragile material

Neodymium magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them breaking into shards.

Attention! Looking for details? Check our post: Why are neodymium magnets dangerous?