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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

check parameters »

41.71 ZŁ with VAT / pcs + price for transport

33.91 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 888 99 98 98 otherwise contact us through contact form the contact page.
Specifications and structure of a neodymium magnet can be tested on our magnetic mass calculator.

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Product card - 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 analysis of the assembly - technical parameters

Presented data are the result of a physical calculation. Values were calculated on models for the class Nd2Fe14B. Actual parameters may differ. Use these data as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - interaction chart
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 LBS
19020.0 g / 186.6 N
 dangerous!
1 mm 5310 Gs
531.0 mT
 16.07 kg / 35.42 LBS
16067.7 g / 157.6 N
 dangerous!
2 mm 4846 Gs
484.6 mT
 13.38 kg / 29.50 LBS
13380.1 g / 131.3 N
 dangerous!
3 mm 4397 Gs
439.7 mT
 11.02 kg / 24.29 LBS
11019.3 g / 108.1 N
 dangerous!
5 mm 3576 Gs
357.6 mT
 7.29 kg / 16.07 LBS
7287.1 g / 71.5 N
 warning
10 mm 2073 Gs
207.3 mT
 2.45 kg / 5.40 LBS
2448.1 g / 24.0 N
 warning
15 mm 1231 Gs
123.1 mT
 0.86 kg / 1.90 LBS
863.8 g / 8.5 N
 low risk
20 mm 773 Gs
77.3 mT
 0.34 kg / 0.75 LBS
340.1 g / 3.3 N
 low risk
30 mm 356 Gs
35.6 mT
 0.07 kg / 0.16 LBS
72.1 g / 0.7 N
 low risk
50 mm 115 Gs
11.5 mT
 0.01 kg / 0.02 LBS
7.5 g / 0.1 N
 low risk
Grip strength weakens significantly per each millimeter of gap. Remember that even a very thin break (e.g., dirt, paint, dust) significantly weakens the grip. Neodymiums hold optimally at the point of direct contact; distance weakens the force. Observe how flashily the pull force plummet, when the product does not touch directly to the metal substrate. When designing the arrangement, eliminate unnecessary gaps.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.80 kg / 8.39 LBS
3804.0 g / 37.3 N
1 mm Stal (~0.2) 3.21 kg / 7.09 LBS
3214.0 g / 31.5 N
2 mm Stal (~0.2) 2.68 kg / 5.90 LBS
2676.0 g / 26.3 N
3 mm Stal (~0.2) 2.20 kg / 4.86 LBS
2204.0 g / 21.6 N
5 mm Stal (~0.2) 1.46 kg / 3.21 LBS
1458.0 g / 14.3 N
10 mm Stal (~0.2) 0.49 kg / 1.08 LBS
490.0 g / 4.8 N
15 mm Stal (~0.2) 0.17 kg / 0.38 LBS
172.0 g / 1.7 N
20 mm Stal (~0.2) 0.07 kg / 0.15 LBS
68.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
The table below indicates the theoretical weight limit required to start the downward movement of the magnet downwards against a upright metal surface (considering standard friction coefficient). This value varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
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 LBS
5706.0 g / 56.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.80 kg / 8.39 LBS
3804.0 g / 37.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.90 kg / 4.19 LBS
1902.0 g / 18.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.51 kg / 20.97 LBS
9510.0 g / 93.3 N
When placing a holder on a vertical wall (e.g., a car body), it will maintain just about 1/5 of its nominal power. Gravity as well as a low friction coefficient cause that magnets slide down easier than they pull off. Planning a vertical fastening? Note that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a noticeably lighter load. Application of an anti-slip layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - 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 LBS
951.0 g / 9.3 N
1 mm
13%
 2.38 kg / 5.24 LBS
2377.5 g / 23.3 N
2 mm
25%
 4.76 kg / 10.48 LBS
4755.0 g / 46.6 N
3 mm
38%
 7.13 kg / 15.72 LBS
7132.5 g / 70.0 N
5 mm
63%
 11.89 kg / 26.21 LBS
11887.5 g / 116.6 N
10 mm
100%
 19.02 kg / 41.93 LBS
19020.0 g / 186.6 N
11 mm
100%
 19.02 kg / 41.93 LBS
19020.0 g / 186.6 N
12 mm
100%
 19.02 kg / 41.93 LBS
19020.0 g / 186.6 N
A thin metal plate is not enough to conduct the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid backing of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the magnet holds weaker. We advise picking the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
MP 25x8x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.02 kg / 41.93 LBS
19020.0 g / 186.6 N
 OK
40 °C -2.2% 18.60 kg / 41.01 LBS
18601.6 g / 182.5 N
 OK
60 °C -4.4% 18.18 kg / 40.09 LBS
18183.1 g / 178.4 N
 OK
80 °C -6.6% 17.76 kg / 39.16 LBS
17764.7 g / 174.3 N
100 °C -28.8% 13.54 kg / 29.86 LBS
13542.2 g / 132.8 N
Standard neodymium magnets irreversibly lose parameters above the temperature limit. Protect against heat – heat can irreversibly destroy this product. As the temperature rises, the neodymium's capacity briefly decreases. Avoid using this magnet close to heaters higher than its working range. Exceeding the critical threshold will result in permanent loss of magnetism.
*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 25x8x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 30.91 kg / 68.14 LBS
6 082 Gs
4.64 kg / 10.22 LBS
4636 g / 45.5 N
 N/A
1 mm 28.48 kg / 62.79 LBS
11 091 Gs
4.27 kg / 9.42 LBS
4272 g / 41.9 N
 25.63 kg / 56.51 LBS
~0 Gs
2 mm 26.11 kg / 57.57 LBS
10 620 Gs
3.92 kg / 8.63 LBS
3917 g / 38.4 N
 23.50 kg / 51.81 LBS
~0 Gs
3 mm 23.86 kg / 52.61 LBS
10 153 Gs
3.58 kg / 7.89 LBS
3580 g / 35.1 N
 21.48 kg / 47.35 LBS
~0 Gs
5 mm 19.76 kg / 43.56 LBS
9 238 Gs
2.96 kg / 6.53 LBS
2964 g / 29.1 N
 17.78 kg / 39.20 LBS
~0 Gs
10 mm 11.84 kg / 26.11 LBS
7 152 Gs
1.78 kg / 3.92 LBS
1776 g / 17.4 N
 10.66 kg / 23.50 LBS
~0 Gs
20 mm 3.98 kg / 8.77 LBS
4 145 Gs
0.60 kg / 1.32 LBS
597 g / 5.9 N
 3.58 kg / 7.89 LBS
~0 Gs
50 mm 0.24 kg / 0.54 LBS
1 024 Gs
0.04 kg / 0.08 LBS
36 g / 0.4 N
 0.22 kg / 0.48 LBS
~0 Gs
60 mm 0.12 kg / 0.26 LBS
712 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
 0.11 kg / 0.23 LBS
~0 Gs
70 mm 0.06 kg / 0.13 LBS
514 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
 0.06 kg / 0.12 LBS
~0 Gs
80 mm 0.03 kg / 0.07 LBS
383 Gs
0.01 kg / 0.01 LBS
5 g / 0.1 N
 0.03 kg / 0.07 LBS
~0 Gs
90 mm 0.02 kg / 0.04 LBS
293 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
100 mm 0.01 kg / 0.03 LBS
230 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
Two strong neodymiums interact from a wider radius than a magnet and sheet combination. Such a system of two magnets produces a massive flux and a further horizon of performance. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the impact force is massive. The levitation is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Figures demonstrate sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
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
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
A strong magnetic field is a serious hazard to IT equipment as well as pacemakers. These neodymiums generate a flux that disrupts operation of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

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
NdFeB products are very brittle – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating durability
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 passing through the pole surface. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Shear force

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

2. Efficiency vs thickness

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

3. Thermal stability

*For N38 grade, 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

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
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
Magnet Unit Converter
Force (pull)
Magnetic Field
Simply populate any input, to let the converter fill in everything else instantly.

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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. This product with a force of 19.02 kg works great as a door latch, speaker holder, or spacer element in devices.
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. 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. 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. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. 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 20 mm. The key parameter here is the lifting capacity amounting to approximately 19.02 kg (force ~186.54 N). The mounting hole diameter is precisely 8 mm.
The poles are located on the planes with holes, not on the sides of the ring. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths as well as weaknesses of neodymium magnets.

Strengths

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They possess excellent resistance to magnetism drop as a result of external fields,
  • In other words, due to the aesthetic finish of gold, the element is aesthetically pleasing,
  • Magnets are characterized by maximum magnetic induction on the outer layer,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Considering the possibility of precise forming and customization to individualized needs, neodymium magnets can be produced in a variety of shapes and sizes, which amplifies use scope,
  • Significant place in modern industrial fields – they are utilized in data components, brushless drives, precision medical tools, as well as modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating nuts in the magnet and complicated forms - recommended is cover - magnetic holder.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process 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

Pull force analysis

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

The declared magnet strength refers to the maximum value, measured under laboratory conditions, meaning:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with an ground touching surface
  • with total lack of distance (no coatings)
  • under axial force direction (90-degree angle)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by working environment parameters, mainly (from most important):
  • Distance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be wasted into the air.
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy steels lower magnetic permeability and holding force.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Do not overheat magnets

Watch the temperature. Exposing the magnet to high heat will ruin its properties and pulling force.

Immense force

Before use, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Threat to navigation

Remember: neodymium magnets produce a field that confuses sensitive sensors. Maintain a safe distance from your phone, tablet, and GPS.

Dust is flammable

Machining of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Swallowing risk

Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.

Cards and drives

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can permanently damage these devices and erase data from cards.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness happens, immediately stop handling magnets and wear gloves.

Crushing force

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

Magnets are brittle

Beware of splinters. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

Medical interference

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

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