MP 41x15x10 / N38 - ring magnet

ring magnet

Catalog no 030200

GTIN/EAN: 5906301812173

5.00
Load capacity 24.44 kg / 239.78 N Magnetic Induction 271.77 mT / 2718 Gs
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
Coating
[NiCuNi] Nickel

40.65net / pcs

50.00 zł with VAT (23% VAT) / pcs

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Net
Gross
price from 1 pcs
40.65 zł
50.00 zł
price from 20 pcs
38.21 zł
47.00 zł
price from 70 pcs
35.77 zł
44.00 zł

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 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 analysis of the magnet - data

Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
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
strong
15 mm 2028 Gs
202.8 mT
3.67 kg / 8.09 LBS
3670.1 g / 36.0 N
strong
20 mm 1443 Gs
144.3 mT
1.86 kg / 4.10 LBS
1858.4 g / 18.2 N
weak grip
30 mm 770 Gs
77.0 mT
0.53 kg / 1.17 LBS
529.8 g / 5.2 N
weak grip
50 mm 280 Gs
28.0 mT
0.07 kg / 0.15 LBS
69.8 g / 0.7 N
weak grip

Table 2: Sliding hold (vertical surface)
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 (shearing) - vertical pull
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 stability (stability) - 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 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: Two magnets (repulsion) - 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: Hazards (implants) - warnings
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
Mobile device 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

Table 8: Impact energy (kinetic energy) - warning
MP 41x15x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.85 km/h
(5.79 m/s)
1.44 J
30 mm 24.15 km/h
(6.71 m/s)
1.93 J
50 mm 24.42 km/h
(6.78 m/s)
1.97 J
100 mm 24.47 km/h
(6.80 m/s)
1.98 J

Table 9: Anti-corrosion coating 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)

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

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

Table 11: Physics of underwater searching
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Vertical hold

*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Heat tolerance

*For N38 grade, the safety 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

Elemental analysis

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
Measurement Calculator

Magnet pull force


Magnetic Field

Other offers

It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. 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 41x15x10 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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.
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.
A screw or bolt with a thread diameter smaller than 15 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.
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.
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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of nickel, the element gains visual value,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Product not for children

These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Safe distance

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

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Handling guide

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Compass and GPS

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Pinching danger

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Warning! Details about risks in the article: Safety of working with magnets.