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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

see parameters »

12.55 ZŁ with VAT / pcs + price for transport

10.20 ZŁ net + 23% VAT / pcs

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Product card - 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

Engineering simulation of the product - report

The following information constitute the outcome of a engineering calculation. Values rely on algorithms for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - power drop
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 pounds
14820.0 g / 145.4 N
 crushing
1 mm 5310 Gs
531.0 mT
 12.52 kg / 27.60 pounds
12519.6 g / 122.8 N
 crushing
2 mm 4846 Gs
484.6 mT
 10.43 kg / 22.98 pounds
10425.5 g / 102.3 N
 crushing
3 mm 4397 Gs
439.7 mT
 8.59 kg / 18.93 pounds
8586.1 g / 84.2 N
 strong
5 mm 3576 Gs
357.6 mT
 5.68 kg / 12.52 pounds
5678.0 g / 55.7 N
 strong
10 mm 2073 Gs
207.3 mT
 1.91 kg / 4.21 pounds
1907.5 g / 18.7 N
 low risk
15 mm 1231 Gs
123.1 mT
 0.67 kg / 1.48 pounds
673.1 g / 6.6 N
 low risk
20 mm 773 Gs
77.3 mT
 0.27 kg / 0.58 pounds
265.0 g / 2.6 N
 low risk
30 mm 356 Gs
35.6 mT
 0.06 kg / 0.12 pounds
56.2 g / 0.6 N
 low risk
50 mm 115 Gs
11.5 mT
 0.01 kg / 0.01 pounds
5.9 g / 0.1 N
 low risk
Magnetic force weakens drastically with every mm of distance. Keep in mind that even a microscopic distance (e.g., contamination, paint, rust) strongly reduces the pull force. Magnets operate strongest in perfect adhesion; air break drastically cuts the power. See how flashily the pull force drop, when the magnet does not touch directly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Slippage capacity (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 pounds
2964.0 g / 29.1 N
1 mm Stal (~0.2) 2.50 kg / 5.52 pounds
2504.0 g / 24.6 N
2 mm Stal (~0.2) 2.09 kg / 4.60 pounds
2086.0 g / 20.5 N
3 mm Stal (~0.2) 1.72 kg / 3.79 pounds
1718.0 g / 16.9 N
5 mm Stal (~0.2) 1.14 kg / 2.50 pounds
1136.0 g / 11.1 N
10 mm Stal (~0.2) 0.38 kg / 0.84 pounds
382.0 g / 3.7 N
15 mm Stal (~0.2) 0.13 kg / 0.30 pounds
134.0 g / 1.3 N
20 mm Stal (~0.2) 0.05 kg / 0.12 pounds
54.0 g / 0.5 N
30 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The table below shows the approximate weight limit sufficient to start the sliding of the magnet downwards on a upright steel wall (assuming standard friction coefficient). This value is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
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 pounds
4446.0 g / 43.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.96 kg / 6.53 pounds
2964.0 g / 29.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.48 kg / 3.27 pounds
1482.0 g / 14.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.41 kg / 16.34 pounds
7410.0 g / 72.7 N
When mounting a holder on a vertical plane (e.g., a board), it will maintain just about 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that holders move down faster than they detach. Want to create a hanger? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a noticeably lighter cargo. Utilizing a rubberized layer can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MP 25x7x9 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.74 kg / 1.63 pounds
741.0 g / 7.3 N
1 mm
13%
 1.85 kg / 4.08 pounds
1852.5 g / 18.2 N
2 mm
25%
 3.71 kg / 8.17 pounds
3705.0 g / 36.3 N
3 mm
38%
 5.56 kg / 12.25 pounds
5557.5 g / 54.5 N
5 mm
63%
 9.26 kg / 20.42 pounds
9262.5 g / 90.9 N
10 mm
100%
 14.82 kg / 32.67 pounds
14820.0 g / 145.4 N
11 mm
100%
 14.82 kg / 32.67 pounds
14820.0 g / 145.4 N
12 mm
100%
 14.82 kg / 32.67 pounds
14820.0 g / 145.4 N
A thin sheet cannot focus the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a thin surface, the flux will penetrate right through and the attraction force will be weaker. To achieve 100% of this magnet's potential, you require a sufficiently solid piece of metal. The material oversaturation means that on delicate walls (e.g., appliance housings), the product holds weaker. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (stability) - power drop
MP 25x7x9 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.82 kg / 32.67 pounds
14820.0 g / 145.4 N
 OK
40 °C -2.2% 14.49 kg / 31.95 pounds
14494.0 g / 142.2 N
 OK
60 °C -4.4% 14.17 kg / 31.23 pounds
14167.9 g / 139.0 N
 OK
80 °C -6.6% 13.84 kg / 30.52 pounds
13841.9 g / 135.8 N
100 °C -28.8% 10.55 kg / 23.26 pounds
10551.8 g / 103.5 N
Ordinary NdFeB products lose strength after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this product. As the temperature rises, the magnet's force momentarily decreases. Do not use this magnet close to ovens exceeding its operating temperature limit. Too high temperature will lead to permanent loss of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 74.73 kg / 164.76 pounds
6 082 Gs
11.21 kg / 24.71 pounds
11210 g / 110.0 N
 N/A
1 mm 68.86 kg / 151.81 pounds
11 091 Gs
10.33 kg / 22.77 pounds
10329 g / 101.3 N
 61.97 kg / 136.63 pounds
~0 Gs
2 mm 63.13 kg / 139.18 pounds
10 620 Gs
9.47 kg / 20.88 pounds
9470 g / 92.9 N
 56.82 kg / 125.26 pounds
~0 Gs
3 mm 57.70 kg / 127.20 pounds
10 153 Gs
8.65 kg / 19.08 pounds
8654 g / 84.9 N
 51.93 kg / 114.48 pounds
~0 Gs
5 mm 47.77 kg / 105.31 pounds
9 238 Gs
7.17 kg / 15.80 pounds
7165 g / 70.3 N
 42.99 kg / 94.78 pounds
~0 Gs
10 mm 28.63 kg / 63.12 pounds
7 152 Gs
4.29 kg / 9.47 pounds
4295 g / 42.1 N
 25.77 kg / 56.81 pounds
~0 Gs
20 mm 9.62 kg / 21.21 pounds
4 145 Gs
1.44 kg / 3.18 pounds
1443 g / 14.2 N
 8.66 kg / 19.09 pounds
~0 Gs
50 mm 0.59 kg / 1.29 pounds
1 024 Gs
0.09 kg / 0.19 pounds
88 g / 0.9 N
 0.53 kg / 1.16 pounds
~0 Gs
60 mm 0.28 kg / 0.62 pounds
712 Gs
0.04 kg / 0.09 pounds
43 g / 0.4 N
 0.26 kg / 0.56 pounds
~0 Gs
70 mm 0.15 kg / 0.33 pounds
514 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
80 mm 0.08 kg / 0.18 pounds
383 Gs
0.01 kg / 0.03 pounds
12 g / 0.1 N
 0.07 kg / 0.16 pounds
~0 Gs
90 mm 0.05 kg / 0.11 pounds
293 Gs
0.01 kg / 0.02 pounds
7 g / 0.1 N
 0.04 kg / 0.10 pounds
~0 Gs
100 mm 0.03 kg / 0.07 pounds
230 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
Two magnets interact from a significantly greater distance than a neodymium and metal combination. Such a system of two magnets produces a massive flux and a larger range of operation. Want to build a strong closure? Use a pair of magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the collision energy is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Field value in repulsion mode drops to ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
* Estimates demonstrate shear force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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 electronics as well as medical implants. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation passes through tissues and plastic. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - 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
Magnetic elements are delicate – a collision with steel can result in shattering. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or injury to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when playing with powerful specimens.

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

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

Parameter Value SI Unit / Description
Magnetic Flux 22 495 Mx 225.0 µWb
Pc Coefficient 1.05 High (Stable)
Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
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%
Corrosion 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Warning: On a vertical wall, the magnet holds only ~20% of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 grade, the max working temp 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.

Technical and environmental data
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
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The ring-shaped magnet MP 25x7x9 / N38 is created for mechanical fastening, where glue might fail or be insufficient. 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 great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. It's a good idea to use a rubber spacer 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. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
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. 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.
This model is characterized by dimensions Ø25x9 mm and a weight of 30.54 g. The key parameter here is the lifting capacity amounting to approximately 14.82 kg (force ~145.39 N). The mounting hole diameter is precisely 7 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 rare earth magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • Their power is durable, and after around ten years it decreases only by ~1% (according to research),
  • Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
  • In other words, due to the shiny layer of nickel, the element is aesthetically pleasing,
  • Neodymium magnets generate maximum magnetic induction on a small area, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of individual forming and optimizing to specific requirements,
  • Significant place in modern industrial fields – they are utilized in data components, brushless drives, precision medical tools, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of making threads in the magnet and complicated shapes - preferred is a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

The force parameter is a result of laboratory testing performed under the following configuration:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • without any air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding will differ depending on the following factors, in order of importance:
  • Air gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

Warnings
Finger safety

Big blocks can smash fingers instantly. Never place your hand betwixt two strong magnets.

Safe operation

Handle magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and respect their power.

Swallowing risk

Absolutely store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.

Data carriers

Device Safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Danger to pacemakers

People with a pacemaker should keep an safe separation from magnets. The magnetic field can interfere with the operation of the implant.

Risk of cracking

Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Thermal limits

Avoid heat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Dust is flammable

Dust created during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Warning for allergy sufferers

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.

Threat to navigation

Navigation devices and smartphones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Safety First! Need more info? Read our article: Are neodymium magnets dangerous?