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MP 25x7.5/4.5x5 / N38 - ring magnet

ring magnet

Catalog no 030194

GTIN/EAN: 5906301812111

5.00
Load capacity 7.72 kg / 75.69 N Magnetic Induction 230.20 mT / 2302 Gs
Diameter
25 mm [±0,1 mm]
internal diameter Ø
7.5/4.5 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
17.81 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
see technical specifications »

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical - MP 25x7.5/4.5x5 / N38 - ring magnet

Specification / characteristics - MP 25x7.5/4.5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030194
GTIN/EAN 5906301812111
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 7.5/4.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 17.81 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.72 kg / 75.69 N
Magnetic Induction ~ ? 230.20 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x7.5/4.5x5 / 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 modeling of the assembly - report

The following data constitute the direct effect of a engineering simulation. Values were calculated on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Use these calculations as a reference point for designers.

Table 1: Static pull force (force vs distance) - characteristics
MP 25x7.5/4.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1995 Gs
199.5 mT
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
 strong
1 mm 1906 Gs
190.6 mT
 7.05 kg / 15.54 lbs
7049.4 g / 69.2 N
 strong
2 mm 1793 Gs
179.3 mT
 6.24 kg / 13.75 lbs
6236.8 g / 61.2 N
 strong
3 mm 1664 Gs
166.4 mT
 5.37 kg / 11.84 lbs
5368.9 g / 52.7 N
 strong
5 mm 1385 Gs
138.5 mT
 3.72 kg / 8.21 lbs
3722.8 g / 36.5 N
 strong
10 mm 788 Gs
78.8 mT
 1.20 kg / 2.65 lbs
1203.8 g / 11.8 N
 safe
15 mm 437 Gs
43.7 mT
 0.37 kg / 0.82 lbs
370.3 g / 3.6 N
 safe
20 mm 253 Gs
25.3 mT
 0.12 kg / 0.27 lbs
124.5 g / 1.2 N
 safe
30 mm 101 Gs
10.1 mT
 0.02 kg / 0.04 lbs
19.8 g / 0.2 N
 safe
50 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 lbs
1.4 g / 0.0 N
 safe
Magnetic force drops sharply with every subsequent millimeter of distance. Note that even the smallest gap (e.g., dirt, varnish, veneer) significantly weakens the grip. Magnets hold most effectively during direct contact; gap kills the power. Observe how flashily the load capacity fall, when the product does not touch tightly to the steel surface. When calculating the assembly, eliminate additional spacers.

Table 2: Sliding load (vertical surface)
MP 25x7.5/4.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.54 kg / 3.40 lbs
1544.0 g / 15.1 N
1 mm Stal (~0.2) 1.41 kg / 3.11 lbs
1410.0 g / 13.8 N
2 mm Stal (~0.2) 1.25 kg / 2.75 lbs
1248.0 g / 12.2 N
3 mm Stal (~0.2) 1.07 kg / 2.37 lbs
1074.0 g / 10.5 N
5 mm Stal (~0.2) 0.74 kg / 1.64 lbs
744.0 g / 7.3 N
10 mm Stal (~0.2) 0.24 kg / 0.53 lbs
240.0 g / 2.4 N
15 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 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 defines the theoretical force sufficient to cause the slippage of the magnet down against a upright metal surface (considering typical friction coefficient). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x7.5/4.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.32 kg / 5.11 lbs
2316.0 g / 22.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.54 kg / 3.40 lbs
1544.0 g / 15.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.77 kg / 1.70 lbs
772.0 g / 7.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.86 kg / 8.51 lbs
3860.0 g / 37.9 N
When placing a holder on a vertical wall (e.g., a car body), it will only hold only approx. 1/5 of its maximum pull force. Gravitational force and a weak degree of grip mean that magnets move down faster than they detach. Designing a wall mount? Note that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a much lighter cargo. Utilizing a rubberized coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MP 25x7.5/4.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.77 kg / 1.70 lbs
772.0 g / 7.6 N
1 mm
25%
 1.93 kg / 4.25 lbs
1930.0 g / 18.9 N
2 mm
50%
 3.86 kg / 8.51 lbs
3860.0 g / 37.9 N
3 mm
75%
 5.79 kg / 12.76 lbs
5790.0 g / 56.8 N
5 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
10 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
11 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
12 mm
100%
 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
A thin sheet cannot conduct the entire magnetic field, which squanders power of the holder. If you install a neodymium to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you need a suitably thick piece of steel. The saturation effect means that on thin elements (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - thermal limit
MP 25x7.5/4.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.72 kg / 17.02 lbs
7720.0 g / 75.7 N
 OK
40 °C -2.2% 7.55 kg / 16.65 lbs
7550.2 g / 74.1 N
 OK
60 °C -4.4% 7.38 kg / 16.27 lbs
7380.3 g / 72.4 N
80 °C -6.6% 7.21 kg / 15.90 lbs
7210.5 g / 70.7 N
100 °C -28.8% 5.50 kg / 12.12 lbs
5496.6 g / 53.9 N
Classic neodymiums change their properties strength after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly damage this magnet. With every degree above norm, the magnet's capacity momentarily lowers. Do not use this product in hot environments exceeding its safe range. Exceeding the critical threshold will cause destruction of magnetism.
*Important note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MP 25x7.5/4.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.91 kg / 21.84 lbs
3 484 Gs
1.49 kg / 3.28 lbs
1486 g / 14.6 N
 N/A
1 mm 9.51 kg / 20.96 lbs
3 909 Gs
1.43 kg / 3.14 lbs
1426 g / 14.0 N
 8.56 kg / 18.87 lbs
~0 Gs
2 mm 9.05 kg / 19.94 lbs
3 813 Gs
1.36 kg / 2.99 lbs
1357 g / 13.3 N
 8.14 kg / 17.95 lbs
~0 Gs
3 mm 8.54 kg / 18.83 lbs
3 705 Gs
1.28 kg / 2.82 lbs
1281 g / 12.6 N
 7.69 kg / 16.94 lbs
~0 Gs
5 mm 7.45 kg / 16.42 lbs
3 460 Gs
1.12 kg / 2.46 lbs
1117 g / 11.0 N
 6.70 kg / 14.78 lbs
~0 Gs
10 mm 4.78 kg / 10.53 lbs
2 771 Gs
0.72 kg / 1.58 lbs
717 g / 7.0 N
 4.30 kg / 9.48 lbs
~0 Gs
20 mm 1.54 kg / 3.41 lbs
1 576 Gs
0.23 kg / 0.51 lbs
232 g / 2.3 N
 1.39 kg / 3.06 lbs
~0 Gs
50 mm 0.06 kg / 0.13 lbs
312 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.05 kg / 0.12 lbs
~0 Gs
60 mm 0.03 kg / 0.06 lbs
202 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
70 mm 0.01 kg / 0.03 lbs
138 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
80 mm 0.01 kg / 0.01 lbs
97 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.01 lbs
71 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
54 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a wider radius than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of performance. Want to build a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when bringing together two magnets, the impact force is extreme. The levitation is slightly lower than the attraction, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Figures demonstrate shear force of two same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - warnings
MP 25x7.5/4.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.5 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a serious hazard to electronics and medical implants. These NdFeB products produce a flux that destroys function of digital equipment. Notice: the unseen radiation penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MP 25x7.5/4.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.97 km/h
(6.66 m/s)
 0.39 J
30 mm 25.47 km/h
(7.07 m/s)
 0.45 J
50 mm 25.50 km/h
(7.08 m/s)
 0.45 J
100 mm 25.51 km/h
(7.09 m/s)
 0.45 J
Neodymium magnets are delicate – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
MP 25x7.5/4.5x5 / 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: Electrical data (Flux)
MP 25x7.5/4.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 759 Mx 97.6 µWb
Pc Coefficient 0.25 Low (Flat)
Flux value passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 25x7.5/4.5x5 / N38

Environment Effective steel pull Effect
Air (land) 7.72 kg Standard
Water (riverbed) 8.84 kg
(+1.12 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Caution: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25

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.

Technical specification and ecology

Material specification

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: 030194-2026
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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 is not sufficient for rain. 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 7.5/4.5 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.
This model is characterized by dimensions Ø25x5 mm and a weight of 17.81 g. The pulling force of this model is an impressive 7.72 kg, which translates to 75.69 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 7.5/4.5 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets are exceptionally resistant to magnetic field loss caused by external field sources,
  • By covering with a shiny layer of silver, the element presents an aesthetic look,
  • Magnets possess exceptionally strong magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the possibility of flexible forming and customization to custom needs, magnetic components can be manufactured in a broad palette of geometric configurations, which increases their versatility,
  • Versatile presence in high-tech industry – they find application in magnetic memories, drive modules, medical devices, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in compact constructions

Disadvantages

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • We suggest casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to 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

Magnetic strength at its maximum – what it depends on?

Holding force of 7.72 kg is a result of laboratory testing performed under the following configuration:
  • using a base made of high-permeability steel, acting as a magnetic yoke
  • whose thickness equals approx. 10 mm
  • characterized by lack of roughness
  • with zero gap (no impurities)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

In practice, the real power results from several key aspects, ranked from the most important:
  • Distance (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Direction of force – highest force is available only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be lost to the other side.
  • Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Warnings
Material brittleness

Neodymium magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets leads to them cracking into shards.

Danger to pacemakers

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Permanent damage

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Do not drill into magnets

Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Metal Allergy

Studies show that nickel (the usual finish) is a common allergen. If your skin reacts to metals, refrain from direct skin contact or choose encased magnets.

Magnetic interference

Note: rare earth magnets generate a field that disrupts precision electronics. Keep a separation from your mobile, tablet, and navigation systems.

Data carriers

Intense magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Serious injuries

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Powerful field

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Swallowing risk

Absolutely store magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are tragic.

Danger! Learn more about hazards in the article: Magnet Safety Guide.