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MP 25x7x9 / N38 - ring magnet

ring magnet

Catalog no 030195

GTIN/EAN: 5906301812128

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

7 mm [±0,1 mm]

Height

9 mm [±0,1 mm]

Weight

30.54 g

Magnetization Direction

↑ axial

Load capacity

14.82 kg / 145.39 N

Magnetic Induction

362.13 mT / 3621 Gs

Coating

[NiCuNi] Nickel

view parameters »

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Technical - MP 25x7x9 / N38 - ring magnet

Specification / characteristics - MP 25x7x9 / N38 - ring magnet

properties
properties values
Cat. no. 030195
GTIN/EAN 5906301812128
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 mm [±0,1 mm]
Height 9 mm [±0,1 mm]
Weight 30.54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.82 kg / 145.39 N
Magnetic Induction ~ ? 362.13 mT / 3621 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x7x9 / 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

The following information are the result of a engineering simulation. Values are based on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Use these data as a reference point when designing systems.

Table 1: Static force (pull vs gap) - interaction chart
MP 25x7x9 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
 crushing
1 mm 5310 Gs
531.0 mT
 12.52 kg / 27.60 lbs
12519.6 g / 122.8 N
 crushing
2 mm 4846 Gs
484.6 mT
 10.43 kg / 22.98 lbs
10425.5 g / 102.3 N
 crushing
3 mm 4397 Gs
439.7 mT
 8.59 kg / 18.93 lbs
8586.1 g / 84.2 N
 medium risk
5 mm 3576 Gs
357.6 mT
 5.68 kg / 12.52 lbs
5678.0 g / 55.7 N
 medium risk
10 mm 2073 Gs
207.3 mT
 1.91 kg / 4.21 lbs
1907.5 g / 18.7 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.67 kg / 1.48 lbs
673.1 g / 6.6 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.27 kg / 0.58 lbs
265.0 g / 2.6 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.06 kg / 0.12 lbs
56.2 g / 0.6 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.01 kg / 0.01 lbs
5.9 g / 0.1 N
 weak grip
Pulling power weakens drastically per each millimeter of gap. Keep in mind that even a very thin break (e.g., contamination, varnish, veneer) noticeably reduces the pull force. Magnetic products work strongest at the point of direct contact; gap weakens the force. Analyze how quickly the parameters drop, when the magnet does not adhere directly to the metal substrate. When calculating the mounting, discard redundant distances.

Table 2: Shear force (vertical surface)
MP 25x7x9 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.96 kg / 6.53 lbs
2964.0 g / 29.1 N
1 mm Stal (~0.2) 2.50 kg / 5.52 lbs
2504.0 g / 24.6 N
2 mm Stal (~0.2) 2.09 kg / 4.60 lbs
2086.0 g / 20.5 N
3 mm Stal (~0.2) 1.72 kg / 3.79 lbs
1718.0 g / 16.9 N
5 mm Stal (~0.2) 1.14 kg / 2.50 lbs
1136.0 g / 11.1 N
10 mm Stal (~0.2) 0.38 kg / 0.84 lbs
382.0 g / 3.7 N
15 mm Stal (~0.2) 0.13 kg / 0.30 lbs
134.0 g / 1.3 N
20 mm Stal (~0.2) 0.05 kg / 0.12 lbs
54.0 g / 0.5 N
30 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section shows the estimated force sufficient to cause the sliding of the magnet vertically along a upright steel wall (considering typical friction). This parameter depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 25x7x9 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.45 kg / 9.80 lbs
4446.0 g / 43.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.96 kg / 6.53 lbs
2964.0 g / 29.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.48 kg / 3.27 lbs
1482.0 g / 14.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.41 kg / 16.34 lbs
7410.0 g / 72.7 N
When mounting a element on a vertical wall (e.g., a fridge), it you can count on barely approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient mean that magnets slip faster than they pop off the substrate. Designing a wall mount? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will slip down under a much lighter cargo. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MP 25x7x9 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.74 kg / 1.63 lbs
741.0 g / 7.3 N
1 mm
13%
 1.85 kg / 4.08 lbs
1852.5 g / 18.2 N
2 mm
25%
 3.71 kg / 8.17 lbs
3705.0 g / 36.3 N
3 mm
38%
 5.56 kg / 12.25 lbs
5557.5 g / 54.5 N
5 mm
63%
 9.26 kg / 20.42 lbs
9262.5 g / 90.9 N
10 mm
100%
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
11 mm
100%
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
12 mm
100%
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
A too thin steel is unable to focus the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To achieve 100% of this neodymium's power, you require a sufficiently solid backing of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the holder works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (stability) - thermal limit
MP 25x7x9 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
 OK
40 °C -2.2% 14.49 kg / 31.95 lbs
14494.0 g / 142.2 N
 OK
60 °C -4.4% 14.17 kg / 31.23 lbs
14167.9 g / 139.0 N
 OK
80 °C -6.6% 13.84 kg / 30.52 lbs
13841.9 g / 135.8 N
100 °C -28.8% 10.55 kg / 23.26 lbs
10551.8 g / 103.5 N
Standard neodymium magnets change their properties power after exceeding the maximum temperature. Protect against heat – heat can irreversibly damage this product. With every degree above norm, the magnet's capacity temporarily drops. Avoid using this magnet close to heaters higher than its operating temperature limit. Too high temperature will result in permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MP 25x7x9 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 74.73 kg / 164.76 lbs
6 082 Gs
11.21 kg / 24.71 lbs
11210 g / 110.0 N
 N/A
1 mm 68.86 kg / 151.81 lbs
11 091 Gs
10.33 kg / 22.77 lbs
10329 g / 101.3 N
 61.97 kg / 136.63 lbs
~0 Gs
2 mm 63.13 kg / 139.18 lbs
10 620 Gs
9.47 kg / 20.88 lbs
9470 g / 92.9 N
 56.82 kg / 125.26 lbs
~0 Gs
3 mm 57.70 kg / 127.20 lbs
10 153 Gs
8.65 kg / 19.08 lbs
8654 g / 84.9 N
 51.93 kg / 114.48 lbs
~0 Gs
5 mm 47.77 kg / 105.31 lbs
9 238 Gs
7.17 kg / 15.80 lbs
7165 g / 70.3 N
 42.99 kg / 94.78 lbs
~0 Gs
10 mm 28.63 kg / 63.12 lbs
7 152 Gs
4.29 kg / 9.47 lbs
4295 g / 42.1 N
 25.77 kg / 56.81 lbs
~0 Gs
20 mm 9.62 kg / 21.21 lbs
4 145 Gs
1.44 kg / 3.18 lbs
1443 g / 14.2 N
 8.66 kg / 19.09 lbs
~0 Gs
50 mm 0.59 kg / 1.29 lbs
1 024 Gs
0.09 kg / 0.19 lbs
88 g / 0.9 N
 0.53 kg / 1.16 lbs
~0 Gs
60 mm 0.28 kg / 0.62 lbs
712 Gs
0.04 kg / 0.09 lbs
43 g / 0.4 N
 0.26 kg / 0.56 lbs
~0 Gs
70 mm 0.15 kg / 0.33 lbs
514 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
80 mm 0.08 kg / 0.18 lbs
383 Gs
0.01 kg / 0.03 lbs
12 g / 0.1 N
 0.07 kg / 0.16 lbs
~0 Gs
90 mm 0.05 kg / 0.11 lbs
293 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
 0.04 kg / 0.10 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
230 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
Two magnetic products interact from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of performance. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the pinch force is massive. The levitation is marginally weaker than the attraction, but still significant.
*Field value for N-N configuration is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Note: Calculations apply to sliding force of two same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - precautionary measures
MP 25x7x9 / 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
Timepiece 20 Gs (2.0 mT) 10.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.0 cm
Car key 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
Powerful magnet radiation poses a large risk to IT equipment as well as medical implants. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and plastic. Special caution must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MP 25x7x9 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.94 km/h
(6.65 m/s)
 0.68 J
30 mm 38.57 km/h
(10.71 m/s)
 1.75 J
50 mm 49.69 km/h
(13.80 m/s)
 2.91 J
100 mm 70.25 km/h
(19.52 m/s)
 5.82 J
Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can cause material chips or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Corrosion resistance
MP 25x7x9 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MP 25x7x9 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 495 Mx 225.0 µWb
Pc Coefficient 1.05 High (Stable)
Flux value passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MP 25x7x9 / N38

Environment Effective steel pull Effect
Air (land) 14.82 kg Standard
Water (riverbed) 16.97 kg
(+2.15 kg buoyancy gain)
+14.5%
Rust risk: 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. Vertical hold

*Caution: On a vertical surface, the magnet retains merely ~20% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.05

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
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%
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: 030195-2026
Measurement Calculator
Pulling force
Magnetic Induction
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The ring-shaped magnet MP 25x7x9 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. 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 25x7x9 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. 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 does not ensure full waterproofing. 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. 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.
It is a magnetic ring with a diameter of 25 mm and thickness 9 mm. The pulling force of this model is an impressive 14.82 kg, which translates to 145.39 N in newtons. The mounting hole diameter is precisely 7 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.

Pros as well as cons of neodymium magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even over around ten years – the decrease in strength is only ~1% (according to tests),
  • They feature excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
  • By applying a reflective layer of silver, the element presents an nice look,
  • Magnetic induction on the working layer of the magnet turns out to be strong,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Thanks to the option of precise shaping and customization to individualized solutions, NdFeB magnets can be produced in a variety of forms and dimensions, which increases their versatility,
  • Wide application in modern industrial fields – they serve a role in mass storage devices, electric drive systems, precision medical tools, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited ability of making nuts in the magnet and complex shapes - recommended is a housing - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Holding force of 14.82 kg is a theoretical maximum value executed under the following configuration:
  • on a block made of mild steel, optimally conducting the magnetic field
  • with a thickness minimum 10 mm
  • with a surface perfectly flat
  • under conditions of no distance (metal-to-metal)
  • under axial force direction (90-degree angle)
  • in stable room temperature

Determinants of practical lifting force of a magnet

In practice, the actual lifting capacity depends on several key aspects, listed from crucial:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Magnetic interference

GPS units and mobile phones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Respect the power

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

Thermal limits

Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Electronic hazard

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Fire risk

Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Magnets are brittle

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Warning for allergy sufferers

Studies show that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and opt for encased magnets.

Health Danger

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Physical harm

Danger of trauma: The attraction force is so immense that it can cause hematomas, crushing, and broken bones. Use thick gloves.

Adults only

NdFeB magnets are not intended for children. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?