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MP 25x13x8 / N38 - ring magnet

ring magnet

Catalog no 030191

GTIN/EAN: 5906301812081

5.00

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

technical parameters »

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Technical details - 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

Technical modeling of the magnet - report

Presented values constitute the direct effect of a engineering calculation. Results are based on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - interaction chart
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
 dangerous!
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 significantly with every subsequent millimeter of spacing. Remember that even a microscopic distance (e.g., contamination, varnish, dust) noticeably weakens the grip. Magnets hold optimally at the point of direct contact; distance kills the force. See how rapidly the load capacity plummet, when the magnet does not adhere directly to the steel surface. When calculating the mounting, eliminate redundant distances.

Table 2: Sliding load (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 table below indicates the theoretical shear load required to start the sliding of the magnet vertically along a vertical metal surface (assuming typical friction). The holding force varies with the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 mounting a holder on a vertical wall (e.g., a board), it will maintain just about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient influence the fact that holders move down easier than they pull off. Want to create a hanger? Note that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Application of an anti-slip layer can effectively raise the stability.

Table 4: Material efficiency (saturation) - power losses
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 thin sheet is not enough to absorb the full magnetic flux, which wastes potential of the holder. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you require a sufficiently solid element of steel. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the magnet works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - 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 after exceeding the maximum temperature. Protect against heat – excessive heat can permanently destroy this magnet. With every degree above norm, the neodymium's capacity briefly decreases. Avoid using this magnet near heat sources exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties under lower heat stress than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MP 25x13x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnetic products interact from a much further distance than a magnet and sheet combination. The setup of two magnets generates a stronger field and a further horizon of action. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is huge. The repulsion force is marginally weaker than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Important: Results show friction force of two same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
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
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
Powerful magnet radiation poses a serious hazard to electronic devices as well as pacemakers. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Notice: the unseen radiation penetrates the body and housings. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.01 km/h
(6.67 m/s)
 0.48 J
30 mm 38.68 km/h
(10.75 m/s)
 1.24 J
50 mm 49.84 km/h
(13.84 m/s)
 2.06 J
100 mm 70.46 km/h
(19.57 m/s)
 4.12 J
NdFeB products are very brittle – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or dangerous crushing to fingers. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Coating parameters (durability)
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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter Value SI Unit / Description
Magnetic Flux 23 118 Mx 231.2 µWb
Pc Coefficient 1.04 High (Stable)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
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. Vertical hold

*Warning: On a vertical wall, the magnet retains just a fraction of its max power.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 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.

Technical specification and ecology
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
Quick Unit Converter
Force (pull)
Magnetic Induction
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The ring-shaped magnet MP 25x13x8 / N38 is created for permanent mounting, 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 is a crucial issue when working with model MP 25x13x8 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. The flat screw head should evenly press the magnet. 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. 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.
It is a magnetic ring with a diameter of 25 mm and thickness 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. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They do not lose magnetism, even over approximately 10 years – the reduction in strength is only ~1% (according to tests),
  • They retain their magnetic properties even under close interference source,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, 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 shape) at temperatures up to 230°C and above...
  • Considering the option of flexible shaping and adaptation to specialized solutions, neodymium magnets can be modeled in a variety of geometric configurations, which expands the range of possible applications,
  • Wide application in innovative solutions – they are commonly used in hard drives, electric drive systems, precision medical tools, and complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

What to avoid - cons of neodymium magnets and ways of using them
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We recommend cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small components of these products can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

The specified lifting capacity concerns the limit force, recorded under optimal environment, namely:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with an ground contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • in stable room temperature

Determinants of practical lifting force of a magnet

Please note that the working load may be lower subject to elements below, in order of importance:
  • Air gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate lowers the holding force.

H&S for magnets
Handling rules

Handle magnets with awareness. Their powerful strength can surprise even professionals. Be vigilant and respect their force.

Magnetic interference

Note: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your mobile, tablet, and GPS.

Thermal limits

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Medical interference

For implant holders: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Data carriers

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Choking Hazard

Absolutely keep magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

Warning for allergy sufferers

Certain individuals experience a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching might lead to dermatitis. We recommend use protective gloves.

Crushing risk

Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.

Material brittleness

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets will cause them shattering into shards.

Mechanical processing

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Caution! Learn more about hazards in the article: Safety of working with magnets.