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MP 25x13x8 / N38 - ring magnet

ring magnet

Catalog no 030191

GTIN/EAN: 5906301812081

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

13 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

21.49 g

Magnetization Direction

↑ axial

Load capacity

10.49 kg / 102.90 N

Magnetic Induction

334.09 mT / 3341 Gs

Coating

[NiCuNi] Nickel

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13.53 ZŁ with VAT / pcs + price for transport

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Technical details - MP 25x13x8 / N38 - ring magnet

Specification / characteristics - MP 25x13x8 / N38 - ring magnet

properties
properties values
Cat. no. 030191
GTIN/EAN 5906301812081
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 8 mm [±0,1 mm]
Weight 21.49 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.49 kg / 102.90 N
Magnetic Induction ~ ? 334.09 mT / 3341 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x8 / 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 modeling of the magnet - data

Presented values represent the result of a engineering simulation. Results are based on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - interaction chart
MP 25x13x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 10.49 kg / 23.13 lbs
10490.0 g / 102.9 N
 crushing
1 mm 5310 Gs
531.0 mT
 8.86 kg / 19.54 lbs
8861.7 g / 86.9 N
 warning
2 mm 4846 Gs
484.6 mT
 7.38 kg / 16.27 lbs
7379.4 g / 72.4 N
 warning
3 mm 4397 Gs
439.7 mT
 6.08 kg / 13.40 lbs
6077.4 g / 59.6 N
 warning
5 mm 3576 Gs
357.6 mT
 4.02 kg / 8.86 lbs
4019.0 g / 39.4 N
 warning
10 mm 2073 Gs
207.3 mT
 1.35 kg / 2.98 lbs
1350.2 g / 13.2 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.48 kg / 1.05 lbs
476.4 g / 4.7 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.19 kg / 0.41 lbs
187.6 g / 1.8 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.04 kg / 0.09 lbs
39.8 g / 0.4 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.01 lbs
4.1 g / 0.0 N
 weak grip
Magnetic force weakens drastically per each millimeter of gap. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) noticeably weakens the grip. Neodymiums hold optimally during direct contact; distance kills the force. Analyze how rapidly the parameters fall, when the product does not adhere tightly to the steel surface. When designing the assembly, discard additional spacers.

Table 2: Vertical force (vertical surface)
MP 25x13x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.10 kg / 4.63 lbs
2098.0 g / 20.6 N
1 mm Stal (~0.2) 1.77 kg / 3.91 lbs
1772.0 g / 17.4 N
2 mm Stal (~0.2) 1.48 kg / 3.25 lbs
1476.0 g / 14.5 N
3 mm Stal (~0.2) 1.22 kg / 2.68 lbs
1216.0 g / 11.9 N
5 mm Stal (~0.2) 0.80 kg / 1.77 lbs
804.0 g / 7.9 N
10 mm Stal (~0.2) 0.27 kg / 0.60 lbs
270.0 g / 2.6 N
15 mm Stal (~0.2) 0.10 kg / 0.21 lbs
96.0 g / 0.9 N
20 mm Stal (~0.2) 0.04 kg / 0.08 lbs
38.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below presents the approximate weight limit required to start the downward movement of the magnet downwards along a vertical steel wall (assuming standard friction). This parameter is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x13x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.15 kg / 6.94 lbs
3147.0 g / 30.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.10 kg / 4.63 lbs
2098.0 g / 20.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.05 kg / 2.31 lbs
1049.0 g / 10.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.25 kg / 11.56 lbs
5245.0 g / 51.5 N
When hanging a holder on a upright plane (e.g., a car body), it will only hold only approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that holders slip easier than they pull off. Planning a hanger? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the element will give way down under a noticeably lighter cargo. Using a rubber pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 25x13x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.52 kg / 1.16 lbs
524.5 g / 5.1 N
1 mm
13%
 1.31 kg / 2.89 lbs
1311.3 g / 12.9 N
2 mm
25%
 2.62 kg / 5.78 lbs
2622.5 g / 25.7 N
3 mm
38%
 3.93 kg / 8.67 lbs
3933.8 g / 38.6 N
5 mm
63%
 6.56 kg / 14.45 lbs
6556.3 g / 64.3 N
10 mm
100%
 10.49 kg / 23.13 lbs
10490.0 g / 102.9 N
11 mm
100%
 10.49 kg / 23.13 lbs
10490.0 g / 102.9 N
12 mm
100%
 10.49 kg / 23.13 lbs
10490.0 g / 102.9 N
A thin metal plate is incapable of take in the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To achieve 100% of this neodymium's potential, you need a suitably thick element of steel. The saturation phenomenon means that on thin elements (e.g., thin profiles), the holder works worse. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MP 25x13x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.49 kg / 23.13 lbs
10490.0 g / 102.9 N
 OK
40 °C -2.2% 10.26 kg / 22.62 lbs
10259.2 g / 100.6 N
 OK
60 °C -4.4% 10.03 kg / 22.11 lbs
10028.4 g / 98.4 N
 OK
80 °C -6.6% 9.80 kg / 21.60 lbs
9797.7 g / 96.1 N
100 °C -28.8% 7.47 kg / 16.47 lbs
7468.9 g / 73.3 N
Standard neodymium magnets lose power above the temperature limit. Watch out for overheating – excessive heat can permanently destroy this product. As the temperature rises, the neodymium's force temporarily lowers. Refrain from using this product in hot environments exceeding its operating temperature limit. Too high temperature will lead to destruction of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently sooner than taller cylinders. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 25x13x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 77.07 kg / 169.90 lbs
6 082 Gs
11.56 kg / 25.49 lbs
11560 g / 113.4 N
 N/A
1 mm 71.01 kg / 156.55 lbs
11 091 Gs
10.65 kg / 23.48 lbs
10652 g / 104.5 N
 63.91 kg / 140.90 lbs
~0 Gs
2 mm 65.10 kg / 143.53 lbs
10 620 Gs
9.77 kg / 21.53 lbs
9766 g / 95.8 N
 58.59 kg / 129.18 lbs
~0 Gs
3 mm 59.50 kg / 131.17 lbs
10 153 Gs
8.92 kg / 19.68 lbs
8925 g / 87.6 N
 53.55 kg / 118.06 lbs
~0 Gs
5 mm 49.26 kg / 108.61 lbs
9 238 Gs
7.39 kg / 16.29 lbs
7389 g / 72.5 N
 44.34 kg / 97.74 lbs
~0 Gs
10 mm 29.53 kg / 65.10 lbs
7 152 Gs
4.43 kg / 9.76 lbs
4429 g / 43.4 N
 26.57 kg / 58.59 lbs
~0 Gs
20 mm 9.92 kg / 21.87 lbs
4 145 Gs
1.49 kg / 3.28 lbs
1488 g / 14.6 N
 8.93 kg / 19.68 lbs
~0 Gs
50 mm 0.61 kg / 1.33 lbs
1 024 Gs
0.09 kg / 0.20 lbs
91 g / 0.9 N
 0.54 kg / 1.20 lbs
~0 Gs
60 mm 0.29 kg / 0.64 lbs
712 Gs
0.04 kg / 0.10 lbs
44 g / 0.4 N
 0.26 kg / 0.58 lbs
~0 Gs
70 mm 0.15 kg / 0.34 lbs
514 Gs
0.02 kg / 0.05 lbs
23 g / 0.2 N
 0.14 kg / 0.30 lbs
~0 Gs
80 mm 0.08 kg / 0.19 lbs
383 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
 0.08 kg / 0.17 lbs
~0 Gs
90 mm 0.05 kg / 0.11 lbs
293 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
 0.04 kg / 0.10 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 / 0.06 lbs
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and sheet combination. The connection of two magnets creates a more powerful interaction and a larger range of action. Designing a solid fastener? Apply two magnets instead of a neodymium 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 large.
*Flux density in repulsion mode is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).
Note: Calculations refer to friction force of two matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - warnings
MP 25x13x8 / 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
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
Powerful magnet radiation poses a serious hazard to IT equipment as well as medical implants. These NdFeB products produce a flux that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MP 25x13x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.01 km/h
(6.67 m/s)
 0.48 J
30 mm 38.68 km/h
(10.75 m/s)
 1.24 J
50 mm 49.84 km/h
(13.84 m/s)
 2.06 J
100 mm 70.46 km/h
(19.57 m/s)
 4.12 J
NdFeB products are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Corrosion resistance
MP 25x13x8 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MP 25x13x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 118 Mx 231.2 µWb
Pc Coefficient 1.04 High (Stable)
Flux value emitted by the pole surface. Key data when building generators as well as sensors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MP 25x13x8 / N38

Environment Effective steel pull Effect
Air (land) 10.49 kg Standard
Water (riverbed) 12.01 kg
(+1.52 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. Buoyancy helps in lifting finds.
1. Sliding resistance

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.04

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.

Engineering data and GPSR
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%
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: 030191-2026
Measurement Calculator
Pulling force
Field Strength
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The ring magnet with a hole MP 25x13x8 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 10.49 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 25x13x8 / 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 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. 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
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. 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.
This model is characterized by dimensions Ø25x8 mm and a weight of 21.49 g. The key parameter here is the holding force amounting to approximately 10.49 kg (force ~102.90 N). The mounting hole diameter is precisely 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 and cons of rare earth magnets.

Advantages

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after approximately ten years it drops only by ~1% (theoretically),
  • Magnets effectively defend themselves against demagnetization caused by foreign field sources,
  • In other words, due to the smooth finish of nickel, the element looks attractive,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of custom machining and adjusting to concrete needs,
  • Universal use in innovative solutions – they are utilized in data components, electric drive systems, precision medical tools, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in producing nuts and complicated forms in magnets, we propose using a housing - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force is the result of a measurement for optimal configuration, assuming:
  • with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • with a cross-section of at least 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • at temperature room level

Impact of factors on magnetic holding capacity in practice

Bear in mind that the application force will differ influenced by the following factors, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Danger to the youngest

Neodymium magnets are not toys. Eating a few magnets may result in them pinching intestinal walls, which poses a severe health hazard and requires urgent medical intervention.

Cards and drives

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Heat sensitivity

Keep cool. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Immense force

Handle magnets consciously. Their huge power can surprise even professionals. Stay alert and respect their power.

Avoid contact if allergic

Some people have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Prolonged contact can result in a rash. We strongly advise wear safety gloves.

Phone sensors

Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a safe distance from your mobile, device, and GPS.

Pinching danger

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Medical interference

Individuals with a pacemaker should keep an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.

Do not drill into magnets

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

Material brittleness

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Attention! Want to know more? Check our post: Are neodymium magnets dangerous?