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MP 25x5x27 / N38 - ring magnet

ring magnet

Catalog no 030192

GTIN/EAN: 5906301812098

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

Height

27 mm [±0,1 mm]

Weight

95.43 g

Magnetization Direction

↑ axial

Load capacity

18.51 kg / 181.54 N

Magnetic Induction

562.34 mT / 5623 Gs

Coating

[NiCuNi] Nickel

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47.18 ZŁ with VAT / pcs + price for transport

38.36 ZŁ net + 23% VAT / pcs

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Technical parameters - MP 25x5x27 / N38 - ring magnet

Specification / characteristics - MP 25x5x27 / N38 - ring magnet

properties
properties values
Cat. no. 030192
GTIN/EAN 5906301812098
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 5 mm [±0,1 mm]
Height 27 mm [±0,1 mm]
Weight 95.43 g
Magnetization Direction ↑ axial
Load capacity ~ ? 18.51 kg / 181.54 N
Magnetic Induction ~ ? 562.34 mT / 5623 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x5x27 / 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 product - report

These information are the outcome of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs gap) - characteristics
MP 25x5x27 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5716 Gs
571.6 mT
 18.51 kg / 40.81 pounds
18510.0 g / 181.6 N
 dangerous!
1 mm 5288 Gs
528.8 mT
 15.84 kg / 34.92 pounds
15839.8 g / 155.4 N
 dangerous!
2 mm 4861 Gs
486.1 mT
 13.38 kg / 29.51 pounds
13384.0 g / 131.3 N
 dangerous!
3 mm 4446 Gs
444.6 mT
 11.20 kg / 24.69 pounds
11198.0 g / 109.9 N
 dangerous!
5 mm 3677 Gs
367.7 mT
 7.66 kg / 16.88 pounds
7657.5 g / 75.1 N
 warning
10 mm 2216 Gs
221.6 mT
 2.78 kg / 6.13 pounds
2782.1 g / 27.3 N
 warning
15 mm 1354 Gs
135.4 mT
 1.04 kg / 2.29 pounds
1037.8 g / 10.2 N
 weak grip
20 mm 864 Gs
86.4 mT
 0.42 kg / 0.93 pounds
423.3 g / 4.2 N
 weak grip
30 mm 405 Gs
40.5 mT
 0.09 kg / 0.21 pounds
93.1 g / 0.9 N
 weak grip
50 mm 133 Gs
13.3 mT
 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
 weak grip
Pulling power decreases significantly per each millimeter of spacing. Remember that even a microscopic distance (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets hold strongest at the point of direct contact; distance kills the force. Notice how quickly the parameters drop, when the product does not touch tightly to the metal substrate. When planning the assembly, eliminate additional spacers.

Table 2: Slippage force (vertical surface)
MP 25x5x27 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.70 kg / 8.16 pounds
3702.0 g / 36.3 N
1 mm Stal (~0.2) 3.17 kg / 6.98 pounds
3168.0 g / 31.1 N
2 mm Stal (~0.2) 2.68 kg / 5.90 pounds
2676.0 g / 26.3 N
3 mm Stal (~0.2) 2.24 kg / 4.94 pounds
2240.0 g / 22.0 N
5 mm Stal (~0.2) 1.53 kg / 3.38 pounds
1532.0 g / 15.0 N
10 mm Stal (~0.2) 0.56 kg / 1.23 pounds
556.0 g / 5.5 N
15 mm Stal (~0.2) 0.21 kg / 0.46 pounds
208.0 g / 2.0 N
20 mm Stal (~0.2) 0.08 kg / 0.19 pounds
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
This section calculates the approximate shear load required to initiate the slippage of the magnet vertically against a vertical metal surface (assuming standard friction). The holding force depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 25x5x27 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.55 kg / 12.24 pounds
5553.0 g / 54.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.70 kg / 8.16 pounds
3702.0 g / 36.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.85 kg / 4.08 pounds
1851.0 g / 18.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.26 kg / 20.40 pounds
9255.0 g / 90.8 N
When mounting a holder on a vertical plane (e.g., a fridge), it will only hold barely about 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that products move down faster than they pull off. Want to create a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the magnet will slip down under a much lighter weight. Application of an anti-slip layer can effectively raise the stability.

Table 4: Steel thickness (saturation) - power losses
MP 25x5x27 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.93 kg / 2.04 pounds
925.5 g / 9.1 N
1 mm
13%
 2.31 kg / 5.10 pounds
2313.8 g / 22.7 N
2 mm
25%
 4.63 kg / 10.20 pounds
4627.5 g / 45.4 N
3 mm
38%
 6.94 kg / 15.30 pounds
6941.3 g / 68.1 N
5 mm
63%
 11.57 kg / 25.50 pounds
11568.8 g / 113.5 N
10 mm
100%
 18.51 kg / 40.81 pounds
18510.0 g / 181.6 N
11 mm
100%
 18.51 kg / 40.81 pounds
18510.0 g / 181.6 N
12 mm
100%
 18.51 kg / 40.81 pounds
18510.0 g / 181.6 N
A thin metal plate cannot absorb the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the flux will pass right through and the attraction force will be weaker. To achieve 100% of this neodymium's potential, you need a suitably thick piece of steel. The saturation effect causes that on thin elements (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (stability) - thermal limit
MP 25x5x27 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 18.51 kg / 40.81 pounds
18510.0 g / 181.6 N
 OK
40 °C -2.2% 18.10 kg / 39.91 pounds
18102.8 g / 177.6 N
 OK
60 °C -4.4% 17.70 kg / 39.01 pounds
17695.6 g / 173.6 N
 OK
80 °C -6.6% 17.29 kg / 38.11 pounds
17288.3 g / 169.6 N
100 °C -28.8% 13.18 kg / 29.05 pounds
13179.1 g / 129.3 N
Standard neodymium magnets lose strength above the temperature limit. Watch out for overheating – excessive heat can irreversibly destroy this product. With every degree above norm, the neodymium's capacity momentarily drops. Refrain from using this product in hot environments higher than its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 25x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.99 kg / 30.83 pounds
6 064 Gs
2.10 kg / 4.62 pounds
2098 g / 20.6 N
 N/A
1 mm 12.97 kg / 28.59 pounds
11 008 Gs
1.94 kg / 4.29 pounds
1945 g / 19.1 N
 11.67 kg / 25.73 pounds
~0 Gs
2 mm 11.97 kg / 26.39 pounds
10 576 Gs
1.80 kg / 3.96 pounds
1795 g / 17.6 N
 10.77 kg / 23.75 pounds
~0 Gs
3 mm 11.02 kg / 24.29 pounds
10 146 Gs
1.65 kg / 3.64 pounds
1652 g / 16.2 N
 9.91 kg / 21.86 pounds
~0 Gs
5 mm 9.26 kg / 20.42 pounds
9 303 Gs
1.39 kg / 3.06 pounds
1389 g / 13.6 N
 8.33 kg / 18.37 pounds
~0 Gs
10 mm 5.79 kg / 12.76 pounds
7 353 Gs
0.87 kg / 1.91 pounds
868 g / 8.5 N
 5.21 kg / 11.48 pounds
~0 Gs
20 mm 2.10 kg / 4.63 pounds
4 432 Gs
0.32 kg / 0.70 pounds
315 g / 3.1 N
 1.89 kg / 4.17 pounds
~0 Gs
50 mm 0.14 kg / 0.32 pounds
1 159 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
60 mm 0.07 kg / 0.16 pounds
811 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
 0.06 kg / 0.14 pounds
~0 Gs
70 mm 0.04 kg / 0.08 pounds
589 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.07 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
440 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
338 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
265 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and steel setup. The connection of two magnets produces a massive flux and a further horizon of operation. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is massive. The levitation is marginally weaker than the attraction, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
* Results refer to sliding force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MP 25x5x27 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 18.0 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Timepiece 20 Gs (2.0 mT) 11.0 cm
Mobile device 40 Gs (4.0 mT) 8.5 cm
Car key 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field poses a real danger to IT equipment and pacemakers. These magnets generate a flux that disrupts operation of digital equipment. Remember: the unseen radiation penetrates the body and plastic. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MP 25x5x27 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.31 km/h
(4.25 m/s)
 0.86 J
30 mm 24.40 km/h
(6.78 m/s)
 2.19 J
50 mm 31.42 km/h
(8.73 m/s)
 3.63 J
100 mm 44.42 km/h
(12.34 m/s)
 7.26 J
NdFeB products are delicate – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or injury to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 25x5x27 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 25x5x27 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 917 Mx 49.2 µWb
Pc Coefficient 1.40 High (Stable)
Flux value emitted by the magnet pole. Key data when building generators as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 25x5x27 / N38

Environment Effective steel pull Effect
Air (land) 18.51 kg Standard
Water (riverbed) 21.19 kg
(+2.68 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Thermal stability

*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) = 1.40

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 and environmental data
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: 030192-2026
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Pulling force
Field Strength
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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. Mounting is clean and reversible, unlike gluing. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. 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. 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 5 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.
It is a magnetic ring with a diameter of 25 mm and thickness 27 mm. The pulling force of this model is an impressive 18.51 kg, which translates to 181.54 N in newtons. The mounting hole diameter is precisely 5 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.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • Their strength is maintained, and after around 10 years it drops only by ~1% (theoretically),
  • They retain their magnetic properties even under close interference source,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Thanks to the ability of flexible shaping and customization to custom solutions, magnetic components can be produced in a broad palette of forms and dimensions, which amplifies use scope,
  • Wide application in modern industrial fields – they are commonly used in data components, motor assemblies, medical devices, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing nuts in the magnet and complex forms - recommended is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what it depends on?

The force parameter is a theoretical maximum value executed under standard conditions:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • possessing a thickness of at least 10 mm to avoid saturation
  • characterized by lack of roughness
  • with zero gap (no coatings)
  • during detachment in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the application force will differ subject to the following factors, starting with the most relevant:
  • Air gap (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the power to be wasted into the air.
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Phone sensors

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Heat warning

Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.

Fragile material

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

Do not give to children

Absolutely keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.

Handling guide

Handle magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their power.

Magnetic media

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Bone fractures

Big blocks can smash fingers in a fraction of a second. Do not place your hand between two attracting surfaces.

Combustion hazard

Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Nickel coating and allergies

Studies show that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, prevent direct skin contact and opt for versions in plastic housing.

Medical interference

People with a pacemaker have to maintain an large gap from magnets. The magnetic field can disrupt the operation of the implant.

Important! Need more info? Check our post: Are neodymium magnets dangerous?