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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 properties »

12.55 ZŁ with VAT / pcs + price for transport

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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 assembly - technical parameters

These information are the outcome of a mathematical simulation. Values rely on models for the class Nd2Fe14B. Operational conditions may differ. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static pull 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
 critical level
1 mm 5310 Gs
531.0 mT
 12.52 kg / 27.60 LBS
12519.6 g / 122.8 N
 critical level
2 mm 4846 Gs
484.6 mT
 10.43 kg / 22.98 LBS
10425.5 g / 102.3 N
 critical level
3 mm 4397 Gs
439.7 mT
 8.59 kg / 18.93 LBS
8586.1 g / 84.2 N
 warning
5 mm 3576 Gs
357.6 mT
 5.68 kg / 12.52 LBS
5678.0 g / 55.7 N
 warning
10 mm 2073 Gs
207.3 mT
 1.91 kg / 4.21 LBS
1907.5 g / 18.7 N
 low risk
15 mm 1231 Gs
123.1 mT
 0.67 kg / 1.48 LBS
673.1 g / 6.6 N
 low risk
20 mm 773 Gs
77.3 mT
 0.27 kg / 0.58 LBS
265.0 g / 2.6 N
 low risk
30 mm 356 Gs
35.6 mT
 0.06 kg / 0.12 LBS
56.2 g / 0.6 N
 low risk
50 mm 115 Gs
11.5 mT
 0.01 kg / 0.01 LBS
5.9 g / 0.1 N
 low risk
Grip strength weakens drastically with every mm of gap. Remember that even the smallest gap (e.g., contamination, paint, dust) noticeably weakens the grip. Magnets work most effectively at the point of direct contact; air break weakens the force. See how quickly the parameters fall, when the magnet does not adhere directly to the metal substrate. When planning the arrangement, eliminate unnecessary gaps.

Table 2: Sliding force (wall)
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 calculates the approximate holding capacity needed to initiate the slippage of the magnet down along a vertical steel plate (assuming standard friction). This parameter is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (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 magnet on a upright plane (e.g., a fridge), it you can count on barely about 1/5 of nominal attraction strength. Gravity and a weak degree of grip mean that products slide down faster than they pop off the substrate. Want to create a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a smooth steel, the element will give way down under a significantly smaller weight. Using a rubber layer can drastically increase the grip.

Table 4: Steel thickness (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 thin metal plate is unable to conduct the entire magnetic field, which squanders power of the holder. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To squeeze 100% of this magnet's potential, you need a suitably thick element of metal. The saturation effect means that on delicate walls (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel dimension based on the following data.

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
Classic neodymiums change their properties strength above the temperature limit. Protect against heat – high temperature can permanently damage this product. With increasing heat, the magnet's capacity briefly lowers. Do not use this product in hot environments exceeding its safe range. Too high temperature will cause permanent loss of magnetism.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - 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 attract each other from a wider radius than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a wider radius of action. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the impact force is huge. The levitation is slightly lower than the attraction, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Calculations demonstrate shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - 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
Mobile device 40 Gs (4.0 mT) 8.0 cm
Remote 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
A strong magnetic field is a real danger to electronic devices as well as pacemakers. These neodymiums generate a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, 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 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 very brittle – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during installation so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the magnet. 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction 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 defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely weakens the holding force.

3. Power loss vs temp

*For standard magnets, the critical 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.

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: 030195-2026
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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. This product with a force of 14.82 kg works great as a door latch, speaker holder, or spacer element in devices.
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 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. This product is dedicated for indoor use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 7 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 Ø25x9 mm and a weight of 30.54 g. 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They feature excellent resistance to magnetism drop due to external magnetic sources,
  • By covering with a shiny coating of nickel, the element gains an professional look,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to the ability of free shaping and customization to custom solutions, magnetic components can be created in a broad palette of geometric configurations, which expands the range of possible applications,
  • Wide application in modern industrial fields – they find application in magnetic memories, motor assemblies, medical equipment, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of creating threads in the magnet and complicated forms - recommended is casing - mounting mechanism.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what it depends on?

The specified lifting capacity concerns the limit force, recorded under laboratory conditions, meaning:
  • with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • whose thickness equals approx. 10 mm
  • characterized by smoothness
  • with zero gap (without paint)
  • under vertical force direction (90-degree angle)
  • in temp. approx. 20°C

Key elements affecting lifting force

It is worth knowing that the application force will differ depending on elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – low-carbon steel attracts best. Alloy admixtures lower magnetic permeability and lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Thermal limits

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Warning for heart patients

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Magnetic interference

Remember: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Nickel coating and allergies

Some people experience a contact allergy to nickel, which is the common plating for neodymium magnets. Prolonged contact can result in an allergic reaction. We strongly advise use safety gloves.

Fire warning

Powder created during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Hand protection

Pinching hazard: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Beware of splinters

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Magnetic media

Device Safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

No play value

Absolutely store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are tragic.

Caution required

Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

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