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MP 25x8x20 / N38 - ring magnet

ring magnet

Catalog no 030450

GTIN/EAN: 5906301812340

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

66.09 g

Magnetization Direction

↑ axial

Load capacity

19.02 kg / 186.54 N

Magnetic Induction

525.50 mT / 5255 Gs

Coating

[NiCuNi] Nickel

product details »

41.71 ZŁ with VAT / pcs + price for transport

33.91 ZŁ net + 23% VAT / pcs

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Call us +48 22 499 98 98 otherwise send us a note via form the contact page.
Lifting power along with structure of magnetic components can be estimated on our online calculation tool.

Orders placed before 14:00 will be shipped the same business day.

Technical specification - MP 25x8x20 / N38 - ring magnet

Specification / characteristics - MP 25x8x20 / N38 - ring magnet

properties
properties values
Cat. no. 030450
GTIN/EAN 5906301812340
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 8 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 66.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.02 kg / 186.54 N
Magnetic Induction ~ ? 525.50 mT / 5255 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x8x20 / 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 simulation of the product - report

These data represent the direct effect of a mathematical simulation. Values rely on models for the class Nd2Fe14B. Actual performance may differ from theoretical values. Treat these data as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - characteristics
MP 25x8x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
 crushing
1 mm 5310 Gs
531.0 mT
 16.07 kg / 35.42 pounds
16067.7 g / 157.6 N
 crushing
2 mm 4846 Gs
484.6 mT
 13.38 kg / 29.50 pounds
13380.1 g / 131.3 N
 crushing
3 mm 4397 Gs
439.7 mT
 11.02 kg / 24.29 pounds
11019.3 g / 108.1 N
 crushing
5 mm 3576 Gs
357.6 mT
 7.29 kg / 16.07 pounds
7287.1 g / 71.5 N
 warning
10 mm 2073 Gs
207.3 mT
 2.45 kg / 5.40 pounds
2448.1 g / 24.0 N
 warning
15 mm 1231 Gs
123.1 mT
 0.86 kg / 1.90 pounds
863.8 g / 8.5 N
 low risk
20 mm 773 Gs
77.3 mT
 0.34 kg / 0.75 pounds
340.1 g / 3.3 N
 low risk
30 mm 356 Gs
35.6 mT
 0.07 kg / 0.16 pounds
72.1 g / 0.7 N
 low risk
50 mm 115 Gs
11.5 mT
 0.01 kg / 0.02 pounds
7.5 g / 0.1 N
 low risk
Pulling power drops sharply per each millimeter of gap. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Neodymiums work optimally in perfect adhesion; air break kills the power. See how flashily the load capacity drop, when the magnet does not adhere flatly to the metal substrate. When designing the assembly, avoid redundant distances.

Table 2: Slippage capacity (wall)
MP 25x8x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.80 kg / 8.39 pounds
3804.0 g / 37.3 N
1 mm Stal (~0.2) 3.21 kg / 7.09 pounds
3214.0 g / 31.5 N
2 mm Stal (~0.2) 2.68 kg / 5.90 pounds
2676.0 g / 26.3 N
3 mm Stal (~0.2) 2.20 kg / 4.86 pounds
2204.0 g / 21.6 N
5 mm Stal (~0.2) 1.46 kg / 3.21 pounds
1458.0 g / 14.3 N
10 mm Stal (~0.2) 0.49 kg / 1.08 pounds
490.0 g / 4.8 N
15 mm Stal (~0.2) 0.17 kg / 0.38 pounds
172.0 g / 1.7 N
20 mm Stal (~0.2) 0.07 kg / 0.15 pounds
68.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The following data presents the theoretical force necessary to cause the slippage of the magnet down along a upright steel plate (assuming standard friction coefficient). This parameter is a function of the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 25x8x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.71 kg / 12.58 pounds
5706.0 g / 56.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.80 kg / 8.39 pounds
3804.0 g / 37.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.90 kg / 4.19 pounds
1902.0 g / 18.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.51 kg / 20.97 pounds
9510.0 g / 93.3 N
When placing a element on a vertical plane (e.g., a fridge), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that magnets move down easier than they pop off the substrate. Want to create a wall mount? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a noticeably lighter cargo. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 25x8x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.95 kg / 2.10 pounds
951.0 g / 9.3 N
1 mm
13%
 2.38 kg / 5.24 pounds
2377.5 g / 23.3 N
2 mm
25%
 4.76 kg / 10.48 pounds
4755.0 g / 46.6 N
3 mm
38%
 7.13 kg / 15.72 pounds
7132.5 g / 70.0 N
5 mm
63%
 11.89 kg / 26.21 pounds
11887.5 g / 116.6 N
10 mm
100%
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
11 mm
100%
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
12 mm
100%
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
A too thin steel is unable to absorb the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the field will pass right through and the attraction force will be weaker. To achieve the maximum of this magnet's potential, you require a sufficiently solid element of metal. The material oversaturation means that on delicate walls (e.g., thin profiles), the magnet works worse. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - power drop
MP 25x8x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
 OK
40 °C -2.2% 18.60 kg / 41.01 pounds
18601.6 g / 182.5 N
 OK
60 °C -4.4% 18.18 kg / 40.09 pounds
18183.1 g / 178.4 N
 OK
80 °C -6.6% 17.76 kg / 39.16 pounds
17764.7 g / 174.3 N
100 °C -28.8% 13.54 kg / 29.86 pounds
13542.2 g / 132.8 N
Classic neodymiums change their properties power past the thermal threshold. Protect against heat – high temperature can irreversibly destroy this magnet. As the temperature rises, the neodymium's power momentarily lowers. Avoid using this magnet close to ovens exceeding its operating temperature limit. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MP 25x8x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 30.91 kg / 68.14 pounds
6 082 Gs
4.64 kg / 10.22 pounds
4636 g / 45.5 N
 N/A
1 mm 28.48 kg / 62.79 pounds
11 091 Gs
4.27 kg / 9.42 pounds
4272 g / 41.9 N
 25.63 kg / 56.51 pounds
~0 Gs
2 mm 26.11 kg / 57.57 pounds
10 620 Gs
3.92 kg / 8.63 pounds
3917 g / 38.4 N
 23.50 kg / 51.81 pounds
~0 Gs
3 mm 23.86 kg / 52.61 pounds
10 153 Gs
3.58 kg / 7.89 pounds
3580 g / 35.1 N
 21.48 kg / 47.35 pounds
~0 Gs
5 mm 19.76 kg / 43.56 pounds
9 238 Gs
2.96 kg / 6.53 pounds
2964 g / 29.1 N
 17.78 kg / 39.20 pounds
~0 Gs
10 mm 11.84 kg / 26.11 pounds
7 152 Gs
1.78 kg / 3.92 pounds
1776 g / 17.4 N
 10.66 kg / 23.50 pounds
~0 Gs
20 mm 3.98 kg / 8.77 pounds
4 145 Gs
0.60 kg / 1.32 pounds
597 g / 5.9 N
 3.58 kg / 7.89 pounds
~0 Gs
50 mm 0.24 kg / 0.54 pounds
1 024 Gs
0.04 kg / 0.08 pounds
36 g / 0.4 N
 0.22 kg / 0.48 pounds
~0 Gs
60 mm 0.12 kg / 0.26 pounds
712 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.23 pounds
~0 Gs
70 mm 0.06 kg / 0.13 pounds
514 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.06 kg / 0.12 pounds
~0 Gs
80 mm 0.03 kg / 0.07 pounds
383 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
 0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.04 pounds
293 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
230 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
Two magnets interact from a wider radius than a magnet and steel setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of performance. Designing a powerful holder? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is massive. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Figures show friction force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
MP 25x8x20 / 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
A strong magnetic field poses a large risk to electronics and medical implants. These NdFeB products produce a flux that disrupts operation of digital equipment. Remember: the unseen radiation acts through matter and glass. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MP 25x8x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.43 km/h
(5.12 m/s)
 0.87 J
30 mm 29.70 km/h
(8.25 m/s)
 2.25 J
50 mm 38.27 km/h
(10.63 m/s)
 3.73 J
100 mm 54.10 km/h
(15.03 m/s)
 7.46 J
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can cause material chips or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Corrosion resistance
MP 25x8x20 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MP 25x8x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 10 108 Mx 101.1 µWb
Pc Coefficient 1.25 High (Stable)
Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MP 25x8x20 / N38

Environment Effective steel pull Effect
Air (land) 19.02 kg Standard
Water (riverbed) 21.78 kg
(+2.76 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds just ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.25

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.

Engineering data and GPSR
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%
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: 030450-2026
Quick Unit Converter
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The ring-shaped magnet MP 25x8x20 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. 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 25x8x20 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. The flat screw head should evenly press the magnet. 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 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.
A screw or bolt with a thread diameter smaller than 8 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.
This model is characterized by dimensions Ø25x20 mm and a weight of 66.09 g. The key parameter here is the holding force amounting to approximately 19.02 kg (force ~186.54 N). The mounting hole diameter is precisely 8 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.

Pros as well as cons of rare earth magnets.

Strengths

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
  • Magnets very well resist against loss of magnetization caused by external fields,
  • Thanks to the shiny finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an modern appearance,
  • Magnetic induction on the working part of the magnet turns out to be exceptional,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • Possibility of precise forming as well as adapting to defined conditions,
  • Key role in innovative solutions – they serve a role in magnetic memories, electric drive systems, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in producing threads and complex shapes in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

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

The lifting capacity listed is a theoretical maximum value performed under standard conditions:
  • on a plate made of mild steel, optimally conducting the magnetic field
  • with a cross-section of at least 10 mm
  • with an ideally smooth touching surface
  • with direct contact (no paint)
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Real force is influenced by working environment parameters, such as (from priority):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the flux to be lost into the air.
  • Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic properties and lifting capacity.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
Machining danger

Dust generated during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Life threat

People with a ICD have to keep an absolute distance from magnets. The magnetism can disrupt the functioning of the life-saving device.

Permanent damage

Do not overheat. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Impact on smartphones

Remember: neodymium magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and navigation systems.

Caution required

Handle with care. Neodymium magnets act from a long distance and connect with huge force, often faster than you can react.

Avoid contact if allergic

It is widely known that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for versions in plastic housing.

Electronic hazard

Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Protective goggles

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

This is not a toy

Adult use only. Tiny parts can be swallowed, causing intestinal necrosis. Store away from children and animals.

Bone fractures

Watch your fingers. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Important! Details about risks in the article: Magnet Safety Guide.