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MP 25x13x4 / N38 - ring magnet

ring magnet

Catalog no 030190

GTIN/EAN: 5906301812074

5.00
Load capacity 4.14 kg / 40.57 N Magnetic Induction 188.92 mT / 1889 Gs
Diameter
25 mm [±0,1 mm]
internal diameter Ø
13 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
10.74 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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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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Technical of the product - MP 25x13x4 / N38 - ring magnet

Specification / characteristics - MP 25x13x4 / N38 - ring magnet

properties
properties values
Cat. no. 030190
GTIN/EAN 5906301812074
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 4 mm [±0,1 mm]
Weight 10.74 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.14 kg / 40.57 N
Magnetic Induction ~ ? 188.92 mT / 1889 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x4 / 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 simulation of the magnet - technical parameters

These information constitute the result of a engineering simulation. Results are based on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - interaction chart
MP 25x13x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 4.14 kg / 9.13 LBS
4140.0 g / 40.6 N
 warning
1 mm 5310 Gs
531.0 mT
 3.50 kg / 7.71 LBS
3497.4 g / 34.3 N
 warning
2 mm 4846 Gs
484.6 mT
 2.91 kg / 6.42 LBS
2912.4 g / 28.6 N
 warning
3 mm 4397 Gs
439.7 mT
 2.40 kg / 5.29 LBS
2398.5 g / 23.5 N
 warning
5 mm 3576 Gs
357.6 mT
 1.59 kg / 3.50 LBS
1586.2 g / 15.6 N
 weak grip
10 mm 2073 Gs
207.3 mT
 0.53 kg / 1.17 LBS
532.9 g / 5.2 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.07 kg / 0.16 LBS
74.0 g / 0.7 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.02 kg / 0.03 LBS
15.7 g / 0.2 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.00 LBS
1.6 g / 0.0 N
 weak grip
Magnetic force weakens drastically per each millimeter of gap. Note that even a microscopic distance (e.g., dirt, varnish, rust) significantly reduces the pull force. Magnetic products hold most effectively at the point of direct contact; distance drastically cuts the force. See how quickly the load capacity plummet, when the magnet does not adhere directly to the steel surface. When calculating the assembly, avoid unnecessary gaps.

Table 2: Vertical capacity (wall)
MP 25x13x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.83 kg / 1.83 LBS
828.0 g / 8.1 N
1 mm Stal (~0.2) 0.70 kg / 1.54 LBS
700.0 g / 6.9 N
2 mm Stal (~0.2) 0.58 kg / 1.28 LBS
582.0 g / 5.7 N
3 mm Stal (~0.2) 0.48 kg / 1.06 LBS
480.0 g / 4.7 N
5 mm Stal (~0.2) 0.32 kg / 0.70 LBS
318.0 g / 3.1 N
10 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
15 mm Stal (~0.2) 0.04 kg / 0.08 LBS
38.0 g / 0.4 N
20 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section defines the approximate force required to cause the sliding of the magnet down against a vertical steel plate (considering typical friction). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 25x13x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 2.74 LBS
1242.0 g / 12.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.83 kg / 1.83 LBS
828.0 g / 8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 0.91 LBS
414.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.07 kg / 4.56 LBS
2070.0 g / 20.3 N
When mounting a holder on a vertical wall (e.g., a board), it you can count on only approx. 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip cause that holders move down faster than they detach. Want to create a hanger? Note that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the magnet will slip down under a much lighter cargo. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 25x13x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.41 kg / 0.91 LBS
414.0 g / 4.1 N
1 mm
25%
 1.04 kg / 2.28 LBS
1035.0 g / 10.2 N
2 mm
50%
 2.07 kg / 4.56 LBS
2070.0 g / 20.3 N
3 mm
75%
 3.10 kg / 6.85 LBS
3105.0 g / 30.5 N
5 mm
100%
 4.14 kg / 9.13 LBS
4140.0 g / 40.6 N
10 mm
100%
 4.14 kg / 9.13 LBS
4140.0 g / 40.6 N
11 mm
100%
 4.14 kg / 9.13 LBS
4140.0 g / 40.6 N
12 mm
100%
 4.14 kg / 9.13 LBS
4140.0 g / 40.6 N
A too thin steel is incapable of absorb the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze 100% of this magnet's potential, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., thin profiles), the holder holds weaker. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
MP 25x13x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.14 kg / 9.13 LBS
4140.0 g / 40.6 N
 OK
40 °C -2.2% 4.05 kg / 8.93 LBS
4048.9 g / 39.7 N
 OK
60 °C -4.4% 3.96 kg / 8.73 LBS
3957.8 g / 38.8 N
 OK
80 °C -6.6% 3.87 kg / 8.52 LBS
3866.8 g / 37.9 N
100 °C -28.8% 2.95 kg / 6.50 LBS
2947.7 g / 28.9 N
Classic neodymiums irreversibly lose strength past the thermal threshold. Protect against heat – excessive heat can permanently destroy this magnet. As the temperature rises, the neodymium's force briefly decreases. Refrain from using this magnet near heat sources higher than its working range. Too high temperature will result in destruction of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 25x13x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 83.66 kg / 184.44 LBS
6 082 Gs
12.55 kg / 27.67 LBS
12549 g / 123.1 N
 N/A
1 mm 77.09 kg / 169.95 LBS
11 091 Gs
11.56 kg / 25.49 LBS
11563 g / 113.4 N
 69.38 kg / 152.95 LBS
~0 Gs
2 mm 70.68 kg / 155.81 LBS
10 620 Gs
10.60 kg / 23.37 LBS
10601 g / 104.0 N
 63.61 kg / 140.23 LBS
~0 Gs
3 mm 64.59 kg / 142.40 LBS
10 153 Gs
9.69 kg / 21.36 LBS
9689 g / 95.0 N
 58.13 kg / 128.16 LBS
~0 Gs
5 mm 53.48 kg / 117.90 LBS
9 238 Gs
8.02 kg / 17.68 LBS
8022 g / 78.7 N
 48.13 kg / 106.11 LBS
~0 Gs
10 mm 32.05 kg / 70.66 LBS
7 152 Gs
4.81 kg / 10.60 LBS
4808 g / 47.2 N
 28.85 kg / 63.60 LBS
~0 Gs
20 mm 10.77 kg / 23.74 LBS
4 145 Gs
1.62 kg / 3.56 LBS
1615 g / 15.8 N
 9.69 kg / 21.37 LBS
~0 Gs
50 mm 0.66 kg / 1.45 LBS
1 024 Gs
0.10 kg / 0.22 LBS
99 g / 1.0 N
 0.59 kg / 1.30 LBS
~0 Gs
60 mm 0.32 kg / 0.70 LBS
712 Gs
0.05 kg / 0.10 LBS
48 g / 0.5 N
 0.29 kg / 0.63 LBS
~0 Gs
70 mm 0.17 kg / 0.36 LBS
514 Gs
0.02 kg / 0.05 LBS
25 g / 0.2 N
 0.15 kg / 0.33 LBS
~0 Gs
80 mm 0.09 kg / 0.20 LBS
383 Gs
0.01 kg / 0.03 LBS
14 g / 0.1 N
 0.08 kg / 0.18 LBS
~0 Gs
90 mm 0.05 kg / 0.12 LBS
293 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
100 mm 0.03 kg / 0.07 LBS
230 Gs
0.00 kg / 0.01 LBS
5 g / 0.0 N
 0.03 kg / 0.07 LBS
~0 Gs
Two magnets attract each other from a much further distance than a magnet and sheet setup. Such a system of two magnets creates a more powerful interaction and a wider radius of operation. Want to build a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when attracting two neodymiums, the collision energy is massive. The levitation is a bit weaker than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Important: Figures demonstrate friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - precautionary measures
MP 25x13x4 / 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
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 is a serious hazard to IT equipment and pacemakers. These neodymiums produce a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MP 25x13x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.89 km/h
(5.80 m/s)
 0.18 J
30 mm 22.33 km/h
(6.20 m/s)
 0.21 J
50 mm 22.39 km/h
(6.22 m/s)
 0.21 J
100 mm 22.40 km/h
(6.22 m/s)
 0.21 J
Magnetic elements are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can trigger coating fragments or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Corrosion resistance
MP 25x13x4 / 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 25x13x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 861 Mx 248.6 µWb
Pc Coefficient 1.02 High (Stable)
Total magnetic flux emitted by the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 25x13x4 / N38

Environment Effective steel pull Effect
Air (land) 4.14 kg Standard
Water (riverbed) 4.74 kg
(+0.60 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Shear force

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces 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) = 1.02

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: 030190-2026
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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. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. 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. 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 is not sufficient for rain. 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.
A screw or bolt with a thread diameter smaller than 13 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.
It is a magnetic ring with a diameter of 25 mm and thickness 4 mm. The pulling force of this model is an impressive 4.14 kg, which translates to 40.57 N in newtons. The mounting hole diameter is precisely 13 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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 neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain attractive force for almost ten years – the drop is just ~1% (in theory),
  • They have excellent resistance to magnetism drop due to external magnetic sources,
  • Thanks to the shiny finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
  • Magnets exhibit huge magnetic induction on the surface,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of custom shaping as well as modifying to defined applications,
  • Universal use in modern technologies – they are used in computer drives, motor assemblies, medical equipment, and technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • 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 experience a drop in strength. Often, when the temperature exceeds 80°C, their power 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 suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum holding power of the magnet – what affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:
  • using a plate made of mild steel, serving as a circuit closing element
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by even structure
  • with zero gap (without coatings)
  • during detachment in a direction vertical to the mounting surface
  • at temperature room level

Determinants of lifting force in real conditions

Effective lifting capacity is influenced by working environment parameters, including (from most important):
  • Clearance – existence of foreign body (paint, tape, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be wasted into the air.
  • Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with neodymium magnets
Warning for allergy sufferers

A percentage of the population suffer from a sensitization to Ni, which is the common plating for neodymium magnets. Frequent touching can result in dermatitis. We suggest use safety gloves.

Swallowing risk

Always keep magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are life-threatening.

Handling rules

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

Bodily injuries

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

GPS Danger

A powerful magnetic field disrupts the operation of compasses in phones and GPS navigation. Keep magnets near a smartphone to avoid damaging the sensors.

Mechanical processing

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

Warning for heart patients

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

Material brittleness

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Protect data

Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Demagnetization risk

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. Damage is permanent.

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