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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

50.00 with VAT / pcs + price for transport

40.65 ZŁ net + 23% VAT / pcs

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Technical details - 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

Engineering simulation of the product - data

The following data represent the direct effect of a physical analysis. Values rely on models for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - power drop
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 LBS
24440.0 g / 239.8 N
critical level
1 mm 4978 Gs
497.8 mT
22.12 kg / 48.77 LBS
22120.4 g / 217.0 N
critical level
2 mm 4720 Gs
472.0 mT
19.89 kg / 43.85 LBS
19888.8 g / 195.1 N
critical level
3 mm 4464 Gs
446.4 mT
17.79 kg / 39.22 LBS
17788.4 g / 174.5 N
critical level
5 mm 3964 Gs
396.4 mT
14.03 kg / 30.93 LBS
14030.8 g / 137.6 N
critical level
10 mm 2861 Gs
286.1 mT
7.31 kg / 16.11 LBS
7308.1 g / 71.7 N
warning
15 mm 2028 Gs
202.8 mT
3.67 kg / 8.09 LBS
3670.1 g / 36.0 N
warning
20 mm 1443 Gs
144.3 mT
1.86 kg / 4.10 LBS
1858.4 g / 18.2 N
low risk
30 mm 770 Gs
77.0 mT
0.53 kg / 1.17 LBS
529.8 g / 5.2 N
low risk
50 mm 280 Gs
28.0 mT
0.07 kg / 0.15 LBS
69.8 g / 0.7 N
low risk

Table 2: Sliding hold (wall)
MP 41x15x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
1 mm Stal (~0.2) 4.42 kg / 9.75 LBS
4424.0 g / 43.4 N
2 mm Stal (~0.2) 3.98 kg / 8.77 LBS
3978.0 g / 39.0 N
3 mm Stal (~0.2) 3.56 kg / 7.84 LBS
3558.0 g / 34.9 N
5 mm Stal (~0.2) 2.81 kg / 6.19 LBS
2806.0 g / 27.5 N
10 mm Stal (~0.2) 1.46 kg / 3.22 LBS
1462.0 g / 14.3 N
15 mm Stal (~0.2) 0.73 kg / 1.62 LBS
734.0 g / 7.2 N
20 mm Stal (~0.2) 0.37 kg / 0.82 LBS
372.0 g / 3.6 N
30 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
50 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N

Table 3: Vertical assembly (sliding) - 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 LBS
7332.0 g / 71.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.44 kg / 5.39 LBS
2444.0 g / 24.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.22 kg / 26.94 LBS
12220.0 g / 119.9 N

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 LBS
1222.0 g / 12.0 N
1 mm
13%
3.06 kg / 6.74 LBS
3055.0 g / 30.0 N
2 mm
25%
6.11 kg / 13.47 LBS
6110.0 g / 59.9 N
3 mm
38%
9.17 kg / 20.21 LBS
9165.0 g / 89.9 N
5 mm
63%
15.28 kg / 33.68 LBS
15275.0 g / 149.8 N
10 mm
100%
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
11 mm
100%
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
12 mm
100%
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N

Table 5: Thermal resistance (stability) - resistance threshold
MP 41x15x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
OK
40 °C -2.2% 23.90 kg / 52.70 LBS
23902.3 g / 234.5 N
OK
60 °C -4.4% 23.36 kg / 51.51 LBS
23364.6 g / 229.2 N
OK
80 °C -6.6% 22.83 kg / 50.32 LBS
22827.0 g / 223.9 N
100 °C -28.8% 17.40 kg / 38.36 LBS
17401.3 g / 170.7 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 41x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 178.13 kg / 392.71 LBS
5 907 Gs
26.72 kg / 58.91 LBS
26719 g / 262.1 N
N/A
1 mm 169.67 kg / 374.06 LBS
10 213 Gs
25.45 kg / 56.11 LBS
25451 g / 249.7 N
152.70 kg / 336.65 LBS
~0 Gs
2 mm 161.22 kg / 355.43 LBS
9 955 Gs
24.18 kg / 53.32 LBS
24183 g / 237.2 N
145.10 kg / 319.89 LBS
~0 Gs
3 mm 152.98 kg / 337.26 LBS
9 697 Gs
22.95 kg / 50.59 LBS
22947 g / 225.1 N
137.68 kg / 303.53 LBS
~0 Gs
5 mm 137.18 kg / 302.42 LBS
9 183 Gs
20.58 kg / 45.36 LBS
20577 g / 201.9 N
123.46 kg / 272.18 LBS
~0 Gs
10 mm 102.26 kg / 225.45 LBS
7 929 Gs
15.34 kg / 33.82 LBS
15339 g / 150.5 N
92.04 kg / 202.90 LBS
~0 Gs
20 mm 53.26 kg / 117.43 LBS
5 722 Gs
7.99 kg / 17.61 LBS
7990 g / 78.4 N
47.94 kg / 105.69 LBS
~0 Gs
50 mm 7.08 kg / 15.62 LBS
2 087 Gs
1.06 kg / 2.34 LBS
1063 g / 10.4 N
6.38 kg / 14.06 LBS
~0 Gs
60 mm 3.86 kg / 8.51 LBS
1 541 Gs
0.58 kg / 1.28 LBS
579 g / 5.7 N
3.48 kg / 7.66 LBS
~0 Gs
70 mm 2.20 kg / 4.84 LBS
1 162 Gs
0.33 kg / 0.73 LBS
330 g / 3.2 N
1.98 kg / 4.36 LBS
~0 Gs
80 mm 1.30 kg / 2.87 LBS
895 Gs
0.20 kg / 0.43 LBS
195 g / 1.9 N
1.17 kg / 2.58 LBS
~0 Gs
90 mm 0.80 kg / 1.76 LBS
701 Gs
0.12 kg / 0.26 LBS
120 g / 1.2 N
0.72 kg / 1.59 LBS
~0 Gs
100 mm 0.51 kg / 1.12 LBS
559 Gs
0.08 kg / 0.17 LBS
76 g / 0.7 N
0.46 kg / 1.01 LBS
~0 Gs

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
Car key 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

Table 8: Dynamics (kinetic energy) - warning
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

Table 9: Corrosion resistance
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)

Table 10: Construction data (Pc)
MP 41x15x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 56 505 Mx 565.0 µWb
Pc Coefficient 0.80 High (Stable)

Table 11: Hydrostatics and buoyancy
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel saturation

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

3. Thermal stability

*For N38 grade, the critical limit 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 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: 030200-2026
Measurement Calculator
Force (pull)

Field Strength

View also proposals

The ring magnet with a hole 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. This product with a force of 24.44 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. 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 inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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 Ø41 mm (outer diameter) and height 10 mm. The pulling force of this model is an impressive 24.44 kg, which translates to 239.78 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths and weaknesses of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain full power for around ten years – the loss is just ~1% (according to analyses),
  • Neodymium magnets prove to be extremely resistant to demagnetization caused by external field sources,
  • A magnet with a shiny silver surface is more attractive,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • 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...
  • Possibility of individual machining and adapting to individual needs,
  • Key role in electronics industry – they are commonly used in HDD drives, drive modules, diagnostic systems, also other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their force 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
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
  • Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat contributes to it?

Information about lifting capacity was determined for the most favorable conditions, taking into account:
  • on a block made of mild steel, optimally conducting the magnetic field
  • with a thickness no less than 10 mm
  • with an ground touching surface
  • without any clearance between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

Real force is affected by working environment parameters, including (from most important):
  • Distance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet and the plate decreases the holding force.

Precautions when working with neodymium magnets
Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Allergic reactions

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, prevent direct skin contact and choose encased magnets.

Crushing risk

Large magnets can crush fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Fire risk

Powder created during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Data carriers

Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

GPS Danger

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Danger to pacemakers

For implant holders: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Shattering risk

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Do not underestimate power

Use magnets consciously. Their powerful strength can surprise even professionals. Stay alert and do not underestimate their power.

Danger to the youngest

These products are not intended for children. Swallowing several magnets can lead to them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.

Caution! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98