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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

Physical modeling of the assembly - report

Presented information are the direct effect of a physical calculation. Results are based on algorithms for the material Nd2Fe14B. Operational performance may differ from theoretical values. Please consider these data as a reference point when designing systems.

Table 1: Static pull 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 lbs
24440.0 g / 239.8 N
dangerous!
1 mm 4978 Gs
497.8 mT
22.12 kg / 48.77 lbs
22120.4 g / 217.0 N
dangerous!
2 mm 4720 Gs
472.0 mT
19.89 kg / 43.85 lbs
19888.8 g / 195.1 N
dangerous!
3 mm 4464 Gs
446.4 mT
17.79 kg / 39.22 lbs
17788.4 g / 174.5 N
dangerous!
5 mm 3964 Gs
396.4 mT
14.03 kg / 30.93 lbs
14030.8 g / 137.6 N
dangerous!
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
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: Slippage capacity (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 (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: Steel thickness (saturation) - power losses
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: Working in heat (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: Magnet-Magnet interaction (repulsion) - field range
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: Protective zones (implants) - 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
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 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: Surface protection spec
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: 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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Note: On a vertical wall, the magnet holds only ~20% of its max power.

2. Steel saturation

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

3. Temperature resistance

*For standard magnets, 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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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.

Engineering data and GPSR
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%
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
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Magnet pull force

Magnetic Field

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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. When tightening the screw, you must maintain caution. 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.
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 15 mm fits this model. 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 lifting capacity 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. 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.

Pros as well as cons of rare earth magnets.

Advantages

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They do not lose power, even over nearly ten years – the decrease in power is only ~1% (theoretically),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of exact forming and adjusting to atypical conditions,
  • Universal use in electronics industry – they serve a role in mass storage devices, electric drive systems, medical devices, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The load parameter shown refers to the maximum value, measured under ideal test conditions, specifically:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • whose thickness reaches at least 10 mm
  • with a surface perfectly flat
  • with total lack of distance (no coatings)
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by working environment parameters, including (from priority):
  • Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

Holding force was tested on the plate surface 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%. In addition, even a minimal clearance between the magnet and the plate decreases the load capacity.

Safety rules for work with neodymium magnets
Dust is flammable

Mechanical processing of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Warning for heart patients

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Immense force

Handle magnets consciously. Their huge power can shock even professionals. Plan your moves and do not underestimate their force.

Eye protection

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Demagnetization risk

Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Threat to navigation

Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.

Avoid contact if allergic

Certain individuals suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching might lead to skin redness. It is best to wear safety gloves.

Keep away from computers

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

Do not give to children

Strictly store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are life-threatening.

Bodily injuries

Big blocks can crush fingers instantly. Do not put your hand between two attracting surfaces.

Attention! 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