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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

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Technical parameters - 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

Technical analysis of the magnet - data

Presented data constitute the direct effect of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Actual performance might slightly differ. Please consider these data as a preliminary roadmap for designers.

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
 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
Grip strength weakens sharply with every mm of gap. Remember that even the smallest gap (e.g., contamination, paint, veneer) strongly reduces the pull force. Neodymiums operate optimally at the point of direct contact; gap drastically cuts the power. Observe how quickly the load capacity plummet, when the product does not adhere tightly to the steel surface. When calculating the assembly, discard additional spacers.

Table 2: Vertical load (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
The following data shows the estimated weight limit needed to cause the slippage of the magnet downwards on a upright steel plate (considering standard friction coefficient). This parameter is a function of the separation distance between the magnet and the metal.

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
When hanging a holder on a upright plane (e.g., a car body), it you can count on barely approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient cause that holders move down faster than they pull off. Want to create a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a much lighter load. Application of an anti-slip coating can effectively raise the stability.

Table 4: Material efficiency (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
A too thin steel is not enough to focus the full magnetic flux, which weakens actual performance of the magnet. Should you attach a powerful product to a too thin substrate, the field will penetrate right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you require a sufficiently solid backing of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the product shows lower pull force. We advise picking the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - thermal limit
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
Standard neodymium magnets change their properties strength past the thermal threshold. Avoid high temperatures – high temperature can irreversibly damage this product. With every degree above norm, the neodymium's force temporarily decreases. Refrain from using this product in hot environments exceeding its working range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) may lose charge permanently sooner compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 41x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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
Two magnetic products attract each other from a wider radius than a neodymium and metal combination. The setup of two magnets produces a massive flux and a wider radius of action. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Remember that when attracting two neodymiums, the collision energy is extreme. The repulsion force is marginally weaker than the attraction, but still large.
*Flux density for N-N configuration drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Note: Figures refer to shear force of a pair of identical magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (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
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
Extremely neodym field is a large risk to electronic devices and medical implants. These magnets produce a field that disrupts operation of digital equipment. Remember: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

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
Magnetic elements are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when working with powerful specimens.

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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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. Essential parameter for generator designers and motors. The Pc coefficient defines the working geometry.

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.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds merely ~20% of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 material, 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
Quick Unit Converter
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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. Mounting is clean and reversible, unlike gluing. This product with a force of 24.44 kg works great as a door latch, speaker holder, or mounting element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 15 mm fits this model. 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. 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.
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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose power, even during approximately 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • In other words, due to the smooth finish of gold, the element gains a professional look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Due to the potential of precise molding and customization to custom projects, magnetic components can be modeled in a wide range of forms and dimensions, which makes them more universal,
  • Fundamental importance in high-tech industry – they are utilized in hard drives, electromotive mechanisms, advanced medical instruments, as well as multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Characteristics of disadvantages of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of producing threads in the magnet and complex shapes - preferred is casing - magnet mounting.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Additionally, tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what affects it?

Information about lifting capacity was defined for ideal contact conditions, assuming:
  • using a sheet made of mild steel, functioning as a ideal flux conductor
  • with a thickness no less than 10 mm
  • with a plane cleaned and smooth
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction perpendicular to the plane
  • in stable room temperature

Lifting capacity in practice – influencing factors

In practice, the real power is determined by several key aspects, presented from the most important:
  • Gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the power to be wasted into the air.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets
Respect the power

Exercise caution. Rare earth magnets attract from a long distance and connect with huge force, often faster than you can react.

Keep away from computers

Do not bring magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Beware of splinters

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Do not overheat magnets

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Medical interference

Individuals with a heart stimulator must keep an safe separation from magnets. The magnetism can stop the operation of the life-saving device.

Finger safety

Large magnets can smash fingers in a fraction of a second. Never put your hand between two strong magnets.

Fire risk

Dust generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

This is not a toy

Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.

Phone sensors

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Allergy Warning

Certain individuals experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in skin redness. We suggest use safety gloves.

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