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MP 40x10.4/5.5x5 / N38 - ring magnet

ring magnet

Catalog no 030249

GTIN/EAN: 5906301812258

5.00

Diameter

40 mm [±0,1 mm]

internal diameter Ø

10.4/5.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

46.23 g

Magnetization Direction

↑ axial

Load capacity

9.47 kg / 92.86 N

Magnetic Induction

150.36 mT / 1504 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

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Weight as well as shape of neodymium magnets can be analyzed using our power calculator.

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Technical parameters - MP 40x10.4/5.5x5 / N38 - ring magnet

Specification / characteristics - MP 40x10.4/5.5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030249
GTIN/EAN 5906301812258
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 40 mm [±0,1 mm]
internal diameter Ø 10.4/5.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 46.23 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.47 kg / 92.86 N
Magnetic Induction ~ ? 150.36 mT / 1504 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 40x10.4/5.5x5 / 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 modeling of the magnet - technical parameters

Presented information constitute the result of a physical simulation. Values rely on algorithms for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - power drop
MP 40x10.4/5.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1289 Gs
128.9 mT
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
 medium risk
1 mm 1265 Gs
126.5 mT
 9.12 kg / 20.11 LBS
9120.9 g / 89.5 N
 medium risk
2 mm 1232 Gs
123.2 mT
 8.66 kg / 19.10 LBS
8662.7 g / 85.0 N
 medium risk
3 mm 1193 Gs
119.3 mT
 8.12 kg / 17.90 LBS
8121.3 g / 79.7 N
 medium risk
5 mm 1099 Gs
109.9 mT
 6.89 kg / 15.18 LBS
6887.8 g / 67.6 N
 medium risk
10 mm 825 Gs
82.5 mT
 3.88 kg / 8.56 LBS
3882.0 g / 38.1 N
 medium risk
15 mm 580 Gs
58.0 mT
 1.92 kg / 4.22 LBS
1915.5 g / 18.8 N
 low risk
20 mm 399 Gs
39.9 mT
 0.91 kg / 2.00 LBS
908.3 g / 8.9 N
 low risk
30 mm 195 Gs
19.5 mT
 0.22 kg / 0.48 LBS
217.6 g / 2.1 N
 low risk
50 mm 61 Gs
6.1 mT
 0.02 kg / 0.05 LBS
21.0 g / 0.2 N
 low risk
Grip strength weakens sharply per each millimeter of gap. Keep in mind that even the smallest gap (e.g., contamination, paint, dust) significantly reduces the pull force. Magnetic products hold strongest at the point of direct contact; gap weakens the force. Analyze how rapidly the pull force drop, when the product does not adhere directly to the metal substrate. When calculating the mounting, avoid additional spacers.

Table 2: Slippage capacity (vertical surface)
MP 40x10.4/5.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.89 kg / 4.18 LBS
1894.0 g / 18.6 N
1 mm Stal (~0.2) 1.82 kg / 4.02 LBS
1824.0 g / 17.9 N
2 mm Stal (~0.2) 1.73 kg / 3.82 LBS
1732.0 g / 17.0 N
3 mm Stal (~0.2) 1.62 kg / 3.58 LBS
1624.0 g / 15.9 N
5 mm Stal (~0.2) 1.38 kg / 3.04 LBS
1378.0 g / 13.5 N
10 mm Stal (~0.2) 0.78 kg / 1.71 LBS
776.0 g / 7.6 N
15 mm Stal (~0.2) 0.38 kg / 0.85 LBS
384.0 g / 3.8 N
20 mm Stal (~0.2) 0.18 kg / 0.40 LBS
182.0 g / 1.8 N
30 mm Stal (~0.2) 0.04 kg / 0.10 LBS
44.0 g / 0.4 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The table below calculates the theoretical force needed to cause the sliding of the magnet down on a vertical metal surface (assuming standard friction coefficient). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MP 40x10.4/5.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.84 kg / 6.26 LBS
2841.0 g / 27.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.89 kg / 4.18 LBS
1894.0 g / 18.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.95 kg / 2.09 LBS
947.0 g / 9.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.74 kg / 10.44 LBS
4735.0 g / 46.5 N
When mounting a magnet on a vertical wall (e.g., a board), it will only hold only about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that products slip easier than they pop off the substrate. Planning a wall mount? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the element will slip down under a noticeably lighter cargo. Using a rubber coating can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 40x10.4/5.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.95 kg / 2.09 LBS
947.0 g / 9.3 N
1 mm
25%
 2.37 kg / 5.22 LBS
2367.5 g / 23.2 N
2 mm
50%
 4.74 kg / 10.44 LBS
4735.0 g / 46.5 N
3 mm
75%
 7.10 kg / 15.66 LBS
7102.5 g / 69.7 N
5 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
10 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
11 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
12 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
A thin sheet cannot focus the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a thin surface, the magnetism will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's potential, you require a sufficiently solid backing of steel. The material oversaturation causes that on delicate walls (e.g., thin profiles), the product holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Working in heat (stability) - resistance threshold
MP 40x10.4/5.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
 OK
40 °C -2.2% 9.26 kg / 20.42 LBS
9261.7 g / 90.9 N
 OK
60 °C -4.4% 9.05 kg / 19.96 LBS
9053.3 g / 88.8 N
80 °C -6.6% 8.84 kg / 19.50 LBS
8845.0 g / 86.8 N
100 °C -28.8% 6.74 kg / 14.86 LBS
6742.6 g / 66.1 N
Classic neodymiums lose power past the thermal threshold. Protect against heat – high temperature can permanently damage this magnet. As the temperature rises, the neodymium's capacity momentarily drops. Do not use this magnet close to heaters higher than its safe range. Too high temperature will result in irreversible degradation of magnetism.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 40x10.4/5.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 10.73 kg / 23.65 LBS
2 424 Gs
1.61 kg / 3.55 LBS
1609 g / 15.8 N
 N/A
1 mm 10.55 kg / 23.25 LBS
2 555 Gs
1.58 kg / 3.49 LBS
1582 g / 15.5 N
 9.49 kg / 20.93 LBS
~0 Gs
2 mm 10.33 kg / 22.78 LBS
2 529 Gs
1.55 kg / 3.42 LBS
1550 g / 15.2 N
 9.30 kg / 20.50 LBS
~0 Gs
3 mm 10.09 kg / 22.23 LBS
2 499 Gs
1.51 kg / 3.34 LBS
1513 g / 14.8 N
 9.08 kg / 20.01 LBS
~0 Gs
5 mm 9.52 kg / 20.98 LBS
2 427 Gs
1.43 kg / 3.15 LBS
1427 g / 14.0 N
 8.56 kg / 18.88 LBS
~0 Gs
10 mm 7.80 kg / 17.20 LBS
2 198 Gs
1.17 kg / 2.58 LBS
1170 g / 11.5 N
 7.02 kg / 15.48 LBS
~0 Gs
20 mm 4.40 kg / 9.69 LBS
1 650 Gs
0.66 kg / 1.45 LBS
660 g / 6.5 N
 3.96 kg / 8.72 LBS
~0 Gs
50 mm 0.49 kg / 1.09 LBS
553 Gs
0.07 kg / 0.16 LBS
74 g / 0.7 N
 0.44 kg / 0.98 LBS
~0 Gs
60 mm 0.25 kg / 0.54 LBS
391 Gs
0.04 kg / 0.08 LBS
37 g / 0.4 N
 0.22 kg / 0.49 LBS
~0 Gs
70 mm 0.13 kg / 0.28 LBS
282 Gs
0.02 kg / 0.04 LBS
19 g / 0.2 N
 0.12 kg / 0.26 LBS
~0 Gs
80 mm 0.07 kg / 0.15 LBS
209 Gs
0.01 kg / 0.02 LBS
11 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
90 mm 0.04 kg / 0.09 LBS
158 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
100 mm 0.02 kg / 0.05 LBS
121 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal setup. The connection of two magnets generates a stronger field and a further horizon of performance. Want to build a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when bringing together two magnets, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*Flux density between like poles reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Note: Results demonstrate sliding force of two matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 40x10.4/5.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.0 cm
Car key 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a large risk to electronic devices as well as medical implants. These NdFeB products produce a field that destroys function of digital equipment. Notice: the unseen radiation passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MP 40x10.4/5.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.75 km/h
(4.93 m/s)
 0.56 J
30 mm 25.36 km/h
(7.04 m/s)
 1.15 J
50 mm 32.32 km/h
(8.98 m/s)
 1.86 J
100 mm 45.65 km/h
(12.68 m/s)
 3.72 J
Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
MP 40x10.4/5.5x5 / 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MP 40x10.4/5.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 767 Mx 177.7 µWb
Pc Coefficient 0.17 Low (Flat)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MP 40x10.4/5.5x5 / N38

Environment Effective steel pull Effect
Air (land) 9.47 kg Standard
Water (riverbed) 10.84 kg
(+1.37 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Vertical hold

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

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.17

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.

Technical and environmental data
Material specification
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%
Sustainability
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: 030249-2026
Magnet Unit Converter
Force (pull)
Field Strength
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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 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. 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. 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.
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 (40 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 40 mm and thickness 5 mm. The pulling force of this model is an impressive 9.47 kg, which translates to 92.86 N in newtons. The mounting hole diameter is precisely 10.4/5.5 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.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • Their magnetic field remains stable, and after around ten years it decreases only by ~1% (according to research),
  • Magnets perfectly protect themselves against demagnetization caused by external fields,
  • By applying a decorative layer of nickel, the element presents an modern look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
  • Possibility of individual shaping and adjusting to defined conditions,
  • Key role in advanced technology sectors – they are used in HDD drives, electric drive systems, medical devices, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of making threads in the magnet and complicated forms - preferred is a housing - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Lifting parameters

Highest magnetic holding force – what it depends on?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • using a plate made of low-carbon steel, acting as a circuit closing element
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a surface perfectly flat
  • with direct contact (no coatings)
  • under vertical application of breakaway force (90-degree angle)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

Please note that the working load may be lower depending on elements below, starting with the most relevant:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal environment – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the holding force.

Warnings
Demagnetization risk

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

Magnet fragility

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Mechanical processing

Fire hazard: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.

Medical implants

People with a heart stimulator should keep an absolute distance from magnets. The magnetism can interfere with the operation of the implant.

This is not a toy

Product intended for adults. Small elements pose a choking risk, causing serious injuries. Keep away from kids and pets.

Safe distance

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Metal Allergy

Certain individuals suffer from a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Extended handling might lead to dermatitis. We strongly advise use protective gloves.

Precision electronics

Note: rare earth magnets generate a field that confuses precision electronics. Maintain a safe distance from your mobile, device, and GPS.

Handling rules

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Physical harm

Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?