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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

technical parameters »

6.77 ZŁ with VAT / pcs + price for transport

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Technical - 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

Physical analysis of the magnet - report

The following data represent the direct effect of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - characteristics
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 drops drastically per each millimeter of spacing. Remember that even a very thin break (e.g., contamination, paint, rust) significantly reduces the pull force. Neodymiums work most effectively during direct contact; gap kills the force. Notice how flashily the pull force plummet, when the product does not adhere directly to the metal substrate. When planning the mounting, eliminate redundant distances.

Table 2: Slippage load (wall)
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 presents the estimated shear load necessary to cause the shifting of the magnet vertically against a vertical steel plate (considering typical friction). The holding force depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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 hanging a element on a vertical surface (e.g., a board), it will maintain only about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets slip easier than they pop off the substrate. Want to create a hanger? Note that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will give way down under a noticeably lighter weight. Using a rubber coating can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
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 sheet is not enough to focus the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To achieve the maximum of this magnet's potential, you require a sufficiently solid backing of metal. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the product holds weaker. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (stability) - thermal limit
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
Classic neodymiums lose parameters after exceeding the maximum temperature. Protect against heat – high temperature can permanently destroy this product. As the temperature rises, the neodymium's capacity momentarily decreases. Refrain from using this magnet near heat sources exceeding its working range. Too high temperature will cause destruction of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 25x13x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 magnets attract each other from a wider radius than a magnet and steel combination. The connection of two magnets generates a stronger field and a wider radius of performance. Designing a strong closure? Apply two magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is extreme. The repulsion force is a bit weaker than the attraction, but still significant.
*Field value between like poles reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Note: Results refer to sliding force of two matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (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
Mobile device 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 poses a large risk to electronic devices and medical implants. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation penetrates the body and housings. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
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 prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can cause material chips or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MP 25x13x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 861 Mx 248.6 µWb
Pc Coefficient 1.02 High (Stable)
Total magnetic flux passing through the pole surface. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, 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

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
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%
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: 030190-2026
Quick Unit Converter
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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 easy screwing to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 13 mm fits this model. 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.
The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 4 mm. The key parameter here is the holding force amounting to approximately 4.14 kg (force ~40.57 N). The mounting hole diameter is precisely 13 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They possess excellent resistance to magnetism drop as a result of external fields,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures reaching 230°C and above...
  • Thanks to freedom in designing and the ability to customize to individual projects,
  • Significant place in electronics industry – they are utilized in mass storage devices, brushless drives, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in small systems

Cons

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize 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 shapes - preferred is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, small components of these products are able to 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

Detachment force of the magnet in optimal conditions – what affects it?

Information about lifting capacity was defined for the most favorable conditions, including:
  • with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an polished contact surface
  • with total lack of distance (no paint)
  • during pulling in a direction vertical to the plane
  • at temperature room level

Key elements affecting lifting force

Holding efficiency impacted by specific conditions, such as (from most important):
  • Distance – existence of any layer (paint, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin plate does not accept the full field, causing part of the power to be wasted into the air.
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Handling guide

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

Shattering risk

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Threat to navigation

GPS units and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Nickel allergy

Certain individuals suffer from a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in an allergic reaction. We suggest use safety gloves.

Physical harm

Pinching hazard: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Implant safety

Patients with a heart stimulator have to maintain an large gap from magnets. The magnetism can disrupt the operation of the implant.

Maximum temperature

Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and strength.

Protect data

Data protection: Strong magnets can ruin data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Choking Hazard

NdFeB magnets are not suitable for play. Swallowing several magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Fire warning

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Attention! Details about hazards in the article: Safety of working with magnets.