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MP 25x13x8 / N38 - ring magnet

ring magnet

Catalog no 030191

GTIN/EAN: 5906301812081

5.00
Load capacity 10.49 kg / 102.90 N Magnetic Induction 334.09 mT / 3341 Gs
Diameter
25 mm [±0,1 mm]
internal diameter Ø
13 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
21.49 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical details »

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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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Detailed specification - MP 25x13x8 / N38 - ring magnet

Specification / characteristics - MP 25x13x8 / N38 - ring magnet

properties
properties values
Cat. no. 030191
GTIN/EAN 5906301812081
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 13 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 21.49 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.49 kg / 102.90 N
Magnetic Induction ~ ? 334.09 mT / 3341 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x8 / 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 magnet - report

The following data constitute the outcome of a mathematical analysis. Values are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MP 25x13x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 10.49 kg / 23.13 pounds
10490.0 g / 102.9 N
 crushing
1 mm 5310 Gs
531.0 mT
 8.86 kg / 19.54 pounds
8861.7 g / 86.9 N
 medium risk
2 mm 4846 Gs
484.6 mT
 7.38 kg / 16.27 pounds
7379.4 g / 72.4 N
 medium risk
3 mm 4397 Gs
439.7 mT
 6.08 kg / 13.40 pounds
6077.4 g / 59.6 N
 medium risk
5 mm 3576 Gs
357.6 mT
 4.02 kg / 8.86 pounds
4019.0 g / 39.4 N
 medium risk
10 mm 2073 Gs
207.3 mT
 1.35 kg / 2.98 pounds
1350.2 g / 13.2 N
 low risk
15 mm 1231 Gs
123.1 mT
 0.48 kg / 1.05 pounds
476.4 g / 4.7 N
 low risk
20 mm 773 Gs
77.3 mT
 0.19 kg / 0.41 pounds
187.6 g / 1.8 N
 low risk
30 mm 356 Gs
35.6 mT
 0.04 kg / 0.09 pounds
39.8 g / 0.4 N
 low risk
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.01 pounds
4.1 g / 0.0 N
 low risk
Grip strength decreases drastically with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., dirt, varnish, rust) noticeably weakens the grip. Magnetic products work most effectively in perfect adhesion; gap weakens the power. Notice how flashily the load capacity plummet, when the product does not adhere flatly to the steel surface. When planning the arrangement, avoid redundant distances.

Table 2: Vertical capacity (vertical surface)
MP 25x13x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.10 kg / 4.63 pounds
2098.0 g / 20.6 N
1 mm Stal (~0.2) 1.77 kg / 3.91 pounds
1772.0 g / 17.4 N
2 mm Stal (~0.2) 1.48 kg / 3.25 pounds
1476.0 g / 14.5 N
3 mm Stal (~0.2) 1.22 kg / 2.68 pounds
1216.0 g / 11.9 N
5 mm Stal (~0.2) 0.80 kg / 1.77 pounds
804.0 g / 7.9 N
10 mm Stal (~0.2) 0.27 kg / 0.60 pounds
270.0 g / 2.6 N
15 mm Stal (~0.2) 0.10 kg / 0.21 pounds
96.0 g / 0.9 N
20 mm Stal (~0.2) 0.04 kg / 0.08 pounds
38.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data presents the estimated weight limit necessary to initiate the shifting of the magnet vertically on a vertical steel wall (assuming standard friction coefficient). This parameter varies with the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 25x13x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.15 kg / 6.94 pounds
3147.0 g / 30.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.10 kg / 4.63 pounds
2098.0 g / 20.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.05 kg / 2.31 pounds
1049.0 g / 10.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.25 kg / 11.56 pounds
5245.0 g / 51.5 N
When placing a element on a vertical plane (e.g., a car body), it you can count on only approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip cause that magnets slide down easier than they pull off. Want to create a hanger? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a significantly smaller load. Utilizing a rubberized pad can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x13x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.52 kg / 1.16 pounds
524.5 g / 5.1 N
1 mm
13%
 1.31 kg / 2.89 pounds
1311.3 g / 12.9 N
2 mm
25%
 2.62 kg / 5.78 pounds
2622.5 g / 25.7 N
3 mm
38%
 3.93 kg / 8.67 pounds
3933.8 g / 38.6 N
5 mm
63%
 6.56 kg / 14.45 pounds
6556.3 g / 64.3 N
10 mm
100%
 10.49 kg / 23.13 pounds
10490.0 g / 102.9 N
11 mm
100%
 10.49 kg / 23.13 pounds
10490.0 g / 102.9 N
12 mm
100%
 10.49 kg / 23.13 pounds
10490.0 g / 102.9 N
A too thin steel cannot conduct the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MP 25x13x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.49 kg / 23.13 pounds
10490.0 g / 102.9 N
 OK
40 °C -2.2% 10.26 kg / 22.62 pounds
10259.2 g / 100.6 N
 OK
60 °C -4.4% 10.03 kg / 22.11 pounds
10028.4 g / 98.4 N
 OK
80 °C -6.6% 9.80 kg / 21.60 pounds
9797.7 g / 96.1 N
100 °C -28.8% 7.47 kg / 16.47 pounds
7468.9 g / 73.3 N
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Protect against heat – high temperature can permanently destroy this magnet. With every degree above norm, the neodymium's power briefly decreases. Avoid using this product close to heaters exceeding its operating temperature limit. Too high temperature will lead to destruction of magnetism.
*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 25x13x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 77.07 kg / 169.90 pounds
6 082 Gs
11.56 kg / 25.49 pounds
11560 g / 113.4 N
 N/A
1 mm 71.01 kg / 156.55 pounds
11 091 Gs
10.65 kg / 23.48 pounds
10652 g / 104.5 N
 63.91 kg / 140.90 pounds
~0 Gs
2 mm 65.10 kg / 143.53 pounds
10 620 Gs
9.77 kg / 21.53 pounds
9766 g / 95.8 N
 58.59 kg / 129.18 pounds
~0 Gs
3 mm 59.50 kg / 131.17 pounds
10 153 Gs
8.92 kg / 19.68 pounds
8925 g / 87.6 N
 53.55 kg / 118.06 pounds
~0 Gs
5 mm 49.26 kg / 108.61 pounds
9 238 Gs
7.39 kg / 16.29 pounds
7389 g / 72.5 N
 44.34 kg / 97.74 pounds
~0 Gs
10 mm 29.53 kg / 65.10 pounds
7 152 Gs
4.43 kg / 9.76 pounds
4429 g / 43.4 N
 26.57 kg / 58.59 pounds
~0 Gs
20 mm 9.92 kg / 21.87 pounds
4 145 Gs
1.49 kg / 3.28 pounds
1488 g / 14.6 N
 8.93 kg / 19.68 pounds
~0 Gs
50 mm 0.61 kg / 1.33 pounds
1 024 Gs
0.09 kg / 0.20 pounds
91 g / 0.9 N
 0.54 kg / 1.20 pounds
~0 Gs
60 mm 0.29 kg / 0.64 pounds
712 Gs
0.04 kg / 0.10 pounds
44 g / 0.4 N
 0.26 kg / 0.58 pounds
~0 Gs
70 mm 0.15 kg / 0.34 pounds
514 Gs
0.02 kg / 0.05 pounds
23 g / 0.2 N
 0.14 kg / 0.30 pounds
~0 Gs
80 mm 0.08 kg / 0.19 pounds
383 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.17 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
5 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of performance. Designing a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is massive. The levitation is marginally weaker than the attraction, but still impressive.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint of the gap (due to field cancellation).
Note: Figures refer to sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - warnings
MP 25x13x8 / 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
A strong magnetic field poses a large risk to IT equipment as well as pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Be aware: the unseen radiation acts through matter and housings. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MP 25x13x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.51 km/h
(6.53 m/s)
 0.46 J
30 mm 25.12 km/h
(6.98 m/s)
 0.52 J
50 mm 25.19 km/h
(7.00 m/s)
 0.53 J
100 mm 25.20 km/h
(7.00 m/s)
 0.53 J
Magnetic elements are very brittle – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can cause material chips or injury to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
MP 25x13x8 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MP 25x13x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 118 Mx 231.2 µWb
Pc Coefficient 1.04 High (Stable)
Flux value emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 25x13x8 / N38

Environment Effective steel pull Effect
Air (land) 10.49 kg Standard
Water (riverbed) 12.01 kg
(+1.52 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

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

2. Plate thickness effect

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.04

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.

Engineering data and GPSR

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%

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: 030191-2026
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The ring-shaped magnet MP 25x13x8 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 10.49 kg works great as a door latch, speaker holder, or mounting 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.
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. 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. 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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 8 mm. The key parameter here is the lifting capacity amounting to approximately 10.49 kg (force ~102.90 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 13 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their strength is durable, and after approximately ten years it decreases only by ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • Thanks to the metallic finish, the coating of nickel, gold-plated, or silver gives an visually attractive appearance,
  • Magnets have impressive magnetic induction on the outer side,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Possibility of detailed machining as well as adapting to atypical needs,
  • Significant place in modern industrial fields – they serve a role in data components, electromotive mechanisms, medical equipment, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Limitations

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

Breakaway force was defined for the most favorable conditions, taking into account:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • whose thickness is min. 10 mm
  • with a surface free of scratches
  • with total lack of distance (no paint)
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Determinants of practical lifting force of a magnet

In real-world applications, the actual lifting capacity results from several key aspects, presented from crucial:
  • Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Do not underestimate power

Handle with care. Rare earth magnets attract from a long distance and connect with massive power, often quicker than you can react.

Medical interference

Warning for patients: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.

Magnets are brittle

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets will cause them shattering into small pieces.

Crushing risk

Big blocks can smash fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.

GPS and phone interference

Navigation devices and smartphones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Operating temperature

Control the heat. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Fire risk

Powder produced during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Allergic reactions

Some people experience a hypersensitivity to nickel, which is the common plating for neodymium magnets. Prolonged contact can result in a rash. It is best to use safety gloves.

Adults only

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

Data carriers

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Caution! Learn more about risks in the article: Magnet Safety Guide.