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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

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27.00 ZŁ with VAT / pcs + price for transport

21.95 ZŁ net + 23% VAT / pcs

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Product card - 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

Physical modeling of the assembly - technical parameters

These values are the outcome of a physical analysis. Values were calculated on models for the material Nd2Fe14B. Actual performance may differ. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
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
 safe
20 mm 399 Gs
39.9 mT
 0.91 kg / 2.00 LBS
908.3 g / 8.9 N
 safe
30 mm 195 Gs
19.5 mT
 0.22 kg / 0.48 LBS
217.6 g / 2.1 N
 safe
50 mm 61 Gs
6.1 mT
 0.02 kg / 0.05 LBS
21.0 g / 0.2 N
 safe
Magnetic force drops drastically with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., contamination, paint, veneer) noticeably weakens the grip. Magnets hold strongest at the point of direct contact; gap nullifies the force. Analyze how quickly the parameters drop, when the product does not adhere flatly to the steel surface. When planning the mounting, discard redundant distances.

Table 2: Sliding capacity (wall)
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 defines the theoretical holding capacity necessary to start the shifting of the magnet vertically against a vertical steel wall (assuming standard friction coefficient). This value is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 placing a element on a upright surface (e.g., a car body), it will only hold just approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient mean that products slide down faster than they pull off. Planning a wall mount? Remember that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a much lighter weight. Using a rubber layer can significantly improve the result.

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 too thin steel cannot focus the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you require a sufficiently solid backing of metal. The saturation effect causes that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - 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 irreversibly lose power after exceeding the maximum temperature. Protect against heat – high temperature can permanently demagnetize this product. As the temperature rises, the neodymium's force briefly lowers. Do not use this magnet in hot environments higher than its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 combination. The setup of magnet-to-magnet produces a massive flux and a further horizon of action. Want to build a solid fastener? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs in the exact middle between the magnets (due to field cancellation).
Important: Figures show friction force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
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
Timepiece 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 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
Extremely neodym field is a serious hazard to electronics and medical implants. These neodymiums produce a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - 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
Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when handling with powerful specimens.

Table 9: Surface protection spec
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
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 emitted by the pole surface. Essential parameter when building generators and motors. The Pc coefficient determines 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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical surface, the magnet holds only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Thermal stability

*For standard magnets, the critical limit 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.

Engineering data and GPSR
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%
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
Measurement Calculator
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The ring-shaped magnet MP 40x10.4/5.5x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. 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. 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. 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 10.4/5.5 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 (40 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø40 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 9.47 kg, which translates to 92.86 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 10.4/5.5 mm.
The poles are located on the planes with holes, not on the sides of the ring. 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.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their power remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the top side of the magnet remains maximum,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to modularity in shaping and the ability to customize to complex applications,
  • Wide application in future technologies – they are used in hard drives, brushless drives, medical equipment, also industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 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 and corrosion.
  • We recommend a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these products can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result conducted under the following configuration:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • with a thickness of at least 10 mm
  • characterized by even structure
  • under conditions of ideal adhesion (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity results from a number of factors, ranked from the most important:
  • Gap (betwixt the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – too thin steel does not close the flux, causing part of the flux to be wasted to the other side.
  • Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Warnings
Dust is flammable

Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Permanent damage

Avoid heat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Phone sensors

Note: neodymium magnets generate a field that interferes with precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Magnets are brittle

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Data carriers

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Sensitization to coating

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, avoid direct skin contact and select coated magnets.

Danger to the youngest

Strictly store magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

Implant safety

Individuals with a ICD should maintain an absolute distance from magnets. The magnetic field can disrupt the operation of the implant.

Handling rules

Use magnets consciously. Their powerful strength can shock even experienced users. Stay alert and do not underestimate their force.

Finger safety

Large magnets can smash fingers in a fraction of a second. Do not put your hand between two strong magnets.

Caution! Want to know more? Check our post: Why are neodymium magnets dangerous?