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

ring magnet

Catalog no 030194

GTIN/EAN: 5906301812111

5.00

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

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Technical parameters - 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 simulation of the magnet - data

Presented data are the outcome of a mathematical calculation. Values were calculated on models for the material Nd2Fe14B. Operational conditions may differ. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - interaction chart
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 pounds
7720.0 g / 75.7 N
 medium risk
1 mm 1906 Gs
190.6 mT
 7.05 kg / 15.54 pounds
7049.4 g / 69.2 N
 medium risk
2 mm 1793 Gs
179.3 mT
 6.24 kg / 13.75 pounds
6236.8 g / 61.2 N
 medium risk
3 mm 1664 Gs
166.4 mT
 5.37 kg / 11.84 pounds
5368.9 g / 52.7 N
 medium risk
5 mm 1385 Gs
138.5 mT
 3.72 kg / 8.21 pounds
3722.8 g / 36.5 N
 medium risk
10 mm 788 Gs
78.8 mT
 1.20 kg / 2.65 pounds
1203.8 g / 11.8 N
 weak grip
15 mm 437 Gs
43.7 mT
 0.37 kg / 0.82 pounds
370.3 g / 3.6 N
 weak grip
20 mm 253 Gs
25.3 mT
 0.12 kg / 0.27 pounds
124.5 g / 1.2 N
 weak grip
30 mm 101 Gs
10.1 mT
 0.02 kg / 0.04 pounds
19.8 g / 0.2 N
 weak grip
50 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 pounds
1.4 g / 0.0 N
 weak grip
Pulling power weakens significantly with every mm of distance. Note that every additional insulation layer (e.g., dirt, paint, veneer) noticeably weakens the grip. Magnetic products work optimally during direct contact; distance nullifies the power. Notice how flashily the pull force plummet, when the product does not adhere tightly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Vertical 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 pounds
1544.0 g / 15.1 N
1 mm Stal (~0.2) 1.41 kg / 3.11 pounds
1410.0 g / 13.8 N
2 mm Stal (~0.2) 1.25 kg / 2.75 pounds
1248.0 g / 12.2 N
3 mm Stal (~0.2) 1.07 kg / 2.37 pounds
1074.0 g / 10.5 N
5 mm Stal (~0.2) 0.74 kg / 1.64 pounds
744.0 g / 7.3 N
10 mm Stal (~0.2) 0.24 kg / 0.53 pounds
240.0 g / 2.4 N
15 mm Stal (~0.2) 0.07 kg / 0.16 pounds
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data calculates the theoretical weight limit required to initiate the downward movement of the magnet vertically on a vertical metal surface (considering typical friction). The holding force is a function of the distance between the magnet and the surface.

Table 3: Vertical assembly (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 pounds
2316.0 g / 22.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.54 kg / 3.40 pounds
1544.0 g / 15.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.77 kg / 1.70 pounds
772.0 g / 7.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.86 kg / 8.51 pounds
3860.0 g / 37.9 N
When mounting a element on a upright surface (e.g., a car body), it will only hold only approx. 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that products slide down faster than they pull off. Designing a wall mount? Note that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will slip down under a noticeably lighter cargo. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
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 pounds
772.0 g / 7.6 N
1 mm
25%
 1.93 kg / 4.25 pounds
1930.0 g / 18.9 N
2 mm
50%
 3.86 kg / 8.51 pounds
3860.0 g / 37.9 N
3 mm
75%
 5.79 kg / 12.76 pounds
5790.0 g / 56.8 N
5 mm
100%
 7.72 kg / 17.02 pounds
7720.0 g / 75.7 N
10 mm
100%
 7.72 kg / 17.02 pounds
7720.0 g / 75.7 N
11 mm
100%
 7.72 kg / 17.02 pounds
7720.0 g / 75.7 N
12 mm
100%
 7.72 kg / 17.02 pounds
7720.0 g / 75.7 N
A thin sheet is not enough to take in the entire magnetic field, which weakens actual performance of the holder. If you install a neodymium to a weak sheet, the field will penetrate right through and the holding will be smaller. To squeeze full efficiency of this neodymium's power, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the magnet works worse. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - resistance threshold
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 pounds
7720.0 g / 75.7 N
 OK
40 °C -2.2% 7.55 kg / 16.65 pounds
7550.2 g / 74.1 N
 OK
60 °C -4.4% 7.38 kg / 16.27 pounds
7380.3 g / 72.4 N
80 °C -6.6% 7.21 kg / 15.90 pounds
7210.5 g / 70.7 N
100 °C -28.8% 5.50 kg / 12.12 pounds
5496.6 g / 53.9 N
Ordinary NdFeB products lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly damage this magnet. With every degree above norm, the magnet's force momentarily lowers. Do not use this magnet in hot environments exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table points to permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.91 kg / 21.84 pounds
3 484 Gs
1.49 kg / 3.28 pounds
1486 g / 14.6 N
 N/A
1 mm 9.51 kg / 20.96 pounds
3 909 Gs
1.43 kg / 3.14 pounds
1426 g / 14.0 N
 8.56 kg / 18.87 pounds
~0 Gs
2 mm 9.05 kg / 19.94 pounds
3 813 Gs
1.36 kg / 2.99 pounds
1357 g / 13.3 N
 8.14 kg / 17.95 pounds
~0 Gs
3 mm 8.54 kg / 18.83 pounds
3 705 Gs
1.28 kg / 2.82 pounds
1281 g / 12.6 N
 7.69 kg / 16.94 pounds
~0 Gs
5 mm 7.45 kg / 16.42 pounds
3 460 Gs
1.12 kg / 2.46 pounds
1117 g / 11.0 N
 6.70 kg / 14.78 pounds
~0 Gs
10 mm 4.78 kg / 10.53 pounds
2 771 Gs
0.72 kg / 1.58 pounds
717 g / 7.0 N
 4.30 kg / 9.48 pounds
~0 Gs
20 mm 1.54 kg / 3.41 pounds
1 576 Gs
0.23 kg / 0.51 pounds
232 g / 2.3 N
 1.39 kg / 3.06 pounds
~0 Gs
50 mm 0.06 kg / 0.13 pounds
312 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.05 kg / 0.12 pounds
~0 Gs
60 mm 0.03 kg / 0.06 pounds
202 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
70 mm 0.01 kg / 0.03 pounds
138 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
80 mm 0.01 kg / 0.01 pounds
97 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
71 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
54 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and steel setup. Such a system of two magnets produces a massive flux and a wider radius of action. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is extreme. The levitation is a bit weaker than the connection force, but still significant.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Attention: Calculations refer to friction force of two identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (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
Timepiece 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Car key 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 IT equipment and medical implants. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.95 km/h
(6.38 m/s)
 0.36 J
30 mm 36.43 km/h
(10.12 m/s)
 0.91 J
50 mm 46.96 km/h
(13.04 m/s)
 1.52 J
100 mm 66.40 km/h
(18.44 m/s)
 3.03 J
NdFeB products are prone to chipping – a strong collision with metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or painful pinches to skin. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

Table 9: Corrosion resistance
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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 emitted by the pole surface. Key data for generator designers as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
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%
Rust risk: 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. Shear force

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

2. Steel saturation

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

3. Power loss vs temp

*For standard magnets, the max working temp 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 and environmental data
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%
Sustainability
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
Quick Unit Converter
Pulling force
Magnetic Induction
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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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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.
The inner hole diameter determines the maximum size of the mounting element. 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.
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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain magnetic properties for almost ten years – the loss is just ~1% (in theory),
  • Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a smooth nickel surface is more attractive,
  • Magnets are distinguished by very high magnetic induction on the working surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Possibility of detailed creating and adapting to specific requirements,
  • Huge importance in modern industrial fields – they are commonly used in computer drives, electric drive systems, medical equipment, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in small systems

Weaknesses

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using casing - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Maximum lifting force for a neodymium magnet – what it depends on?

Holding force of 7.72 kg is a measurement result performed under specific, ideal conditions:
  • using a base made of mild steel, functioning as a ideal flux conductor
  • with a thickness minimum 10 mm
  • with an polished touching surface
  • with total lack of distance (without impurities)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Determinants of lifting force in real conditions

Please note that the working load may be lower influenced by the following factors, starting with the most relevant:
  • Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate reduces the load capacity.

H&S for magnets
Precision electronics

Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a safe distance from your mobile, tablet, and navigation systems.

Allergic reactions

Certain individuals have a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling might lead to dermatitis. It is best to use safety gloves.

Bodily injuries

Big blocks can break fingers instantly. Never put your hand between two strong magnets.

Risk of cracking

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets leads to them cracking into small pieces.

Safe distance

Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can destroy these devices and erase data from cards.

No play value

Strictly keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are life-threatening.

Danger to pacemakers

Medical warning: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Dust is flammable

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

Demagnetization risk

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

Handling rules

Handle magnets consciously. Their immense force can shock even experienced users. Plan your moves and respect their force.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?