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MP 41x15x10 / N38 - ring magnet

ring magnet

Catalog no 030200

GTIN/EAN: 5906301812173

5.00

Diameter

41 mm [±0,1 mm]

internal diameter Ø

15 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

85.77 g

Magnetization Direction

↑ axial

Load capacity

24.44 kg / 239.78 N

Magnetic Induction

271.77 mT / 2718 Gs

Coating

[NiCuNi] Nickel

view parameters »

50.00 ZŁ with VAT / pcs + price for transport

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Force along with appearance of a neodymium magnet can be tested on our magnetic mass calculator.

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Technical specification - MP 41x15x10 / N38 - ring magnet

Specification / characteristics - MP 41x15x10 / N38 - ring magnet

properties
properties values
Cat. no. 030200
GTIN/EAN 5906301812173
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 41 mm [±0,1 mm]
internal diameter Ø 15 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 85.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.44 kg / 239.78 N
Magnetic Induction ~ ? 271.77 mT / 2718 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 41x15x10 / 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 product - technical parameters

Presented values are the direct effect of a mathematical calculation. Values rely on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Treat these calculations as a reference point for designers.

Table 1: Static force (pull vs distance) - interaction chart
MP 41x15x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5232 Gs
523.2 mT
 24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
 critical level
1 mm 4978 Gs
497.8 mT
 22.12 kg / 48.77 pounds
22120.4 g / 217.0 N
 critical level
2 mm 4720 Gs
472.0 mT
 19.89 kg / 43.85 pounds
19888.8 g / 195.1 N
 critical level
3 mm 4464 Gs
446.4 mT
 17.79 kg / 39.22 pounds
17788.4 g / 174.5 N
 critical level
5 mm 3964 Gs
396.4 mT
 14.03 kg / 30.93 pounds
14030.8 g / 137.6 N
 critical level
10 mm 2861 Gs
286.1 mT
 7.31 kg / 16.11 pounds
7308.1 g / 71.7 N
 strong
15 mm 2028 Gs
202.8 mT
 3.67 kg / 8.09 pounds
3670.1 g / 36.0 N
 strong
20 mm 1443 Gs
144.3 mT
 1.86 kg / 4.10 pounds
1858.4 g / 18.2 N
 low risk
30 mm 770 Gs
77.0 mT
 0.53 kg / 1.17 pounds
529.8 g / 5.2 N
 low risk
50 mm 280 Gs
28.0 mT
 0.07 kg / 0.15 pounds
69.8 g / 0.7 N
 low risk
Grip strength drops drastically with every subsequent millimeter of gap. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) strongly weakens the grip. Neodymiums hold most effectively at the point of direct contact; distance weakens the force. Notice how rapidly the pull force plummet, when the magnet does not adhere directly to the steel surface. When designing the assembly, avoid additional spacers.

Table 2: Shear load (wall)
MP 41x15x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.89 kg / 10.78 pounds
4888.0 g / 48.0 N
1 mm Stal (~0.2) 4.42 kg / 9.75 pounds
4424.0 g / 43.4 N
2 mm Stal (~0.2) 3.98 kg / 8.77 pounds
3978.0 g / 39.0 N
3 mm Stal (~0.2) 3.56 kg / 7.84 pounds
3558.0 g / 34.9 N
5 mm Stal (~0.2) 2.81 kg / 6.19 pounds
2806.0 g / 27.5 N
10 mm Stal (~0.2) 1.46 kg / 3.22 pounds
1462.0 g / 14.3 N
15 mm Stal (~0.2) 0.73 kg / 1.62 pounds
734.0 g / 7.2 N
20 mm Stal (~0.2) 0.37 kg / 0.82 pounds
372.0 g / 3.6 N
30 mm Stal (~0.2) 0.11 kg / 0.23 pounds
106.0 g / 1.0 N
50 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
The following data indicates the estimated weight limit required to start the downward movement of the magnet down against a upright metal surface (assuming standard friction coefficient). This value is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 41x15x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.33 kg / 16.16 pounds
7332.0 g / 71.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.89 kg / 10.78 pounds
4888.0 g / 48.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.44 kg / 5.39 pounds
2444.0 g / 24.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.22 kg / 26.94 pounds
12220.0 g / 119.9 N
When hanging a element on a vertical plane (e.g., a board), it will only hold only about 20%-30% of nominal attraction strength. Gravity and a weak degree of grip cause that magnets slide down faster than they pull off. Designing a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a noticeably lighter load. Utilizing a rubberized coating can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MP 41x15x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.22 kg / 2.69 pounds
1222.0 g / 12.0 N
1 mm
13%
 3.06 kg / 6.74 pounds
3055.0 g / 30.0 N
2 mm
25%
 6.11 kg / 13.47 pounds
6110.0 g / 59.9 N
3 mm
38%
 9.17 kg / 20.21 pounds
9165.0 g / 89.9 N
5 mm
63%
 15.28 kg / 33.68 pounds
15275.0 g / 149.8 N
10 mm
100%
 24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
11 mm
100%
 24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
12 mm
100%
 24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
A too thin steel is not enough to focus the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's potential, you need a suitably thick piece of steel. The material oversaturation means that on thin elements (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - power drop
MP 41x15x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
 OK
40 °C -2.2% 23.90 kg / 52.70 pounds
23902.3 g / 234.5 N
 OK
60 °C -4.4% 23.36 kg / 51.51 pounds
23364.6 g / 229.2 N
 OK
80 °C -6.6% 22.83 kg / 50.32 pounds
22827.0 g / 223.9 N
100 °C -28.8% 17.40 kg / 38.36 pounds
17401.3 g / 170.7 N
Standard neodymium magnets lose power above the temperature limit. Watch out for overheating – excessive heat can irreversibly damage this magnet. With every degree above norm, the magnet's capacity temporarily decreases. Do not use this magnet in hot environments exceeding its safe range. Too high temperature will result in irreversible degradation of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) risk losing magnetic properties sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 41x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 178.13 kg / 392.71 pounds
5 907 Gs
26.72 kg / 58.91 pounds
26719 g / 262.1 N
 N/A
1 mm 169.67 kg / 374.06 pounds
10 213 Gs
25.45 kg / 56.11 pounds
25451 g / 249.7 N
 152.70 kg / 336.65 pounds
~0 Gs
2 mm 161.22 kg / 355.43 pounds
9 955 Gs
24.18 kg / 53.32 pounds
24183 g / 237.2 N
 145.10 kg / 319.89 pounds
~0 Gs
3 mm 152.98 kg / 337.26 pounds
9 697 Gs
22.95 kg / 50.59 pounds
22947 g / 225.1 N
 137.68 kg / 303.53 pounds
~0 Gs
5 mm 137.18 kg / 302.42 pounds
9 183 Gs
20.58 kg / 45.36 pounds
20577 g / 201.9 N
 123.46 kg / 272.18 pounds
~0 Gs
10 mm 102.26 kg / 225.45 pounds
7 929 Gs
15.34 kg / 33.82 pounds
15339 g / 150.5 N
 92.04 kg / 202.90 pounds
~0 Gs
20 mm 53.26 kg / 117.43 pounds
5 722 Gs
7.99 kg / 17.61 pounds
7990 g / 78.4 N
 47.94 kg / 105.69 pounds
~0 Gs
50 mm 7.08 kg / 15.62 pounds
2 087 Gs
1.06 kg / 2.34 pounds
1063 g / 10.4 N
 6.38 kg / 14.06 pounds
~0 Gs
60 mm 3.86 kg / 8.51 pounds
1 541 Gs
0.58 kg / 1.28 pounds
579 g / 5.7 N
 3.48 kg / 7.66 pounds
~0 Gs
70 mm 2.20 kg / 4.84 pounds
1 162 Gs
0.33 kg / 0.73 pounds
330 g / 3.2 N
 1.98 kg / 4.36 pounds
~0 Gs
80 mm 1.30 kg / 2.87 pounds
895 Gs
0.20 kg / 0.43 pounds
195 g / 1.9 N
 1.17 kg / 2.58 pounds
~0 Gs
90 mm 0.80 kg / 1.76 pounds
701 Gs
0.12 kg / 0.26 pounds
120 g / 1.2 N
 0.72 kg / 1.59 pounds
~0 Gs
100 mm 0.51 kg / 1.12 pounds
559 Gs
0.08 kg / 0.17 pounds
76 g / 0.7 N
 0.46 kg / 1.01 pounds
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. Such a system of magnet-to-magnet generates a stronger field and a larger range of action. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is extreme. The levitation is slightly lower than the connection force, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Attention: Results show shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 41x15x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 19.0 cm
Mechanical watch 20 Gs (2.0 mT) 15.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 11.5 cm
Remote 50 Gs (5.0 mT) 10.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Extremely neodym field poses a large risk to electronic devices and pacemakers. These magnets generate a flux that destroys function of digital equipment. Be aware: the invisible magnetic field penetrates the body and plastic. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MP 41x15x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.95 km/h
(5.54 m/s)
 1.32 J
30 mm 29.88 km/h
(8.30 m/s)
 2.96 J
50 mm 38.13 km/h
(10.59 m/s)
 4.81 J
100 mm 53.84 km/h
(14.96 m/s)
 9.59 J
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can cause material chips or injury to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MP 41x15x10 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MP 41x15x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 56 505 Mx 565.0 µWb
Pc Coefficient 0.80 High (Stable)
Total magnetic flux passing through the magnet pole. Key data when building generators as well as sensors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 41x15x10 / N38

Environment Effective steel pull Effect
Air (land) 24.44 kg Standard
Water (riverbed) 27.98 kg
(+3.54 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Caution: On a vertical wall, the magnet holds only a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.80

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: 030200-2026
Quick Unit Converter
Force (pull)
Field Strength
Simply populate one field, and the calculator compute the rest for you.

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The ring-shaped magnet MP 41x15x10 / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. 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 41x15x10 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer 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. In the place of the mounting hole, the coating is thinner and can be damaged 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 (41 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 41 mm and thickness 10 mm. The key parameter here is the holding force amounting to approximately 24.44 kg (force ~239.78 N). The mounting hole diameter is precisely 15 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.

Advantages and disadvantages of neodymium magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to magnetism drop due to external fields,
  • Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
  • Magnetic induction on the working part of the magnet turns out to be strong,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to modularity in constructing and the ability to customize to specific needs,
  • Fundamental importance in advanced technology sectors – they find application in computer drives, electromotive mechanisms, medical equipment, and other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these magnets are able to 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

Lifting parameters

Highest magnetic holding force – what affects it?

The specified lifting capacity concerns the limit force, obtained under laboratory conditions, namely:
  • with the use of a sheet made of special test steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • with direct contact (no paint)
  • for force applied at a right angle (in the magnet axis)
  • at standard ambient temperature

What influences lifting capacity in practice

It is worth knowing that the working load may be lower subject to the following factors, in order of importance:
  • Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Plate texture – ground elements ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet and the plate decreases the load capacity.

Precautions when working with NdFeB magnets
Thermal limits

Avoid heat. Neodymium magnets are susceptible to heat. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Allergy Warning

Certain individuals experience a hypersensitivity to nickel, which is the common plating for neodymium magnets. Prolonged contact might lead to dermatitis. It is best to use protective gloves.

Danger to pacemakers

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Flammability

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Adults only

These products are not toys. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates immediate surgery.

Threat to electronics

Powerful magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Threat to navigation

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Protective goggles

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Pinching danger

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

Do not underestimate power

Handle magnets consciously. Their immense force can surprise even professionals. Plan your moves and do not underestimate their force.

Safety First! More info about hazards in the article: Safety of working with magnets.