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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

check parameters »

27.00 ZŁ with VAT / pcs + price for transport

21.95 ZŁ net + 23% VAT / pcs

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Detailed specification - 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 analysis of the assembly - data

These data are the result of a physical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static 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
 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 drops significantly with every mm of spacing. Note that even a microscopic distance (e.g., contamination, paint, veneer) strongly diminishes the holding power. Magnets hold strongest in perfect adhesion; air break nullifies the power. Analyze how quickly the load capacity drop, when the product does not adhere tightly to the steel surface. When calculating the arrangement, eliminate additional spacers.

Table 2: Shear load (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
This section defines the approximate force sufficient to cause the shifting of the magnet down on a upright steel plate (assuming standard friction). This parameter varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (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 placing a holder on a upright surface (e.g., a car body), it will maintain only about 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient mean that holders slide down easier than they detach. Designing a vertical fastening? Note that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will give way down under a significantly smaller weight. Application of an anti-slip coating can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
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 is incapable of conduct the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To achieve the maximum of this magnet's power, you need a suitably thick backing of metal. The saturation effect causes that on delicate walls (e.g., car bodies), the holder holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (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
Standard neodymium magnets irreversibly lose parameters above the temperature limit. Watch out for overheating – heat can irreversibly demagnetize this product. As the temperature rises, the magnet's capacity temporarily lowers. Avoid using this product near heat sources exceeding its working range. Too high temperature will cause permanent loss of magnetism.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 40x10.4/5.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 magnets attract each other from a significantly greater distance than a neodymium and metal setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Designing a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is huge. The repulsion force is marginally weaker than the connection force, but still large.
*Flux density for N-N configuration reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Attention: Estimates demonstrate sliding force of two same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - 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
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
Extremely neodym field poses a real danger to electronic devices and pacemakers. These magnets generate a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field acts through matter and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
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
NdFeB products are very brittle – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when working 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: Electrical 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 passing through the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*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

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.

Engineering data and GPSR
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
Quick Unit Converter
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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. Mounting is clean and reversible, unlike gluing. This product with a force of 9.47 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 40x10.4/5.5x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. 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.
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 inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
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. Aesthetic mounting requires selecting the appropriate head size.
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. 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 and disadvantages of neodymium magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even over approximately ten years – the reduction in strength is only ~1% (theoretically),
  • They do not lose their magnetic properties even under close interference source,
  • In other words, due to the metallic finish of silver, the element becomes visually attractive,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in designing and the ability to adapt to complex applications,
  • Versatile presence in high-tech industry – they are commonly used in mass storage devices, electric drive systems, advanced medical instruments, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices

Limitations

What to avoid - cons of neodymium magnets and proposals for their use:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices can be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Lifting parameters

Detachment force of the magnet in optimal conditions – what contributes to it?

Breakaway force was determined for optimal configuration, taking into account:
  • using a base made of low-carbon steel, acting as a magnetic yoke
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at temperature room level

Practical lifting capacity: influencing factors

Effective lifting capacity impacted by working environment parameters, such as (from most important):
  • Clearance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
Permanent damage

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

Protective goggles

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Do not underestimate power

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

Data carriers

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

Do not give to children

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are tragic.

Compass and GPS

A strong magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.

Pinching danger

Big blocks can smash fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Dust explosion hazard

Powder produced during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Health Danger

Patients with a ICD have to keep an large gap from magnets. The magnetic field can disrupt the functioning of the implant.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and use protective gear.

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