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MP 40x20x5 / N38 - ring magnet

ring magnet

Catalog no 030199

GTIN/EAN: 5906301812166

5.00

Diameter

40 mm [±0,1 mm]

internal diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

35.34 g

Magnetization Direction

↑ axial

Load capacity

7.24 kg / 70.98 N

Magnetic Induction

150.36 mT / 1504 Gs

Coating

[NiCuNi] Nickel

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12.24 ZŁ with VAT / pcs + price for transport

9.95 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 888 99 98 98 alternatively let us know through our online form the contact page.
Lifting power as well as shape of neodymium magnets can be reviewed using our online calculation tool.

Orders placed before 14:00 will be shipped the same business day.

Technical of the product - MP 40x20x5 / N38 - ring magnet

Specification / characteristics - MP 40x20x5 / N38 - ring magnet

properties
properties values
Cat. no. 030199
GTIN/EAN 5906301812166
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 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 35.34 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.24 kg / 70.98 N
Magnetic Induction ~ ? 150.36 mT / 1504 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 40x20x5 / 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 simulation of the magnet - report

Presented data constitute the outcome of a physical simulation. Values rely on models for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Treat these data as a reference point for designers.

Table 1: Static force (force vs distance) - interaction chart
MP 40x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5269 Gs
526.9 mT
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
 strong
1 mm 5005 Gs
500.5 mT
 6.53 kg / 14.41 LBS
6534.7 g / 64.1 N
 strong
2 mm 4739 Gs
473.9 mT
 5.86 kg / 12.91 LBS
5857.7 g / 57.5 N
 strong
3 mm 4475 Gs
447.5 mT
 5.22 kg / 11.51 LBS
5222.2 g / 51.2 N
 strong
5 mm 3960 Gs
396.0 mT
 4.09 kg / 9.02 LBS
4090.8 g / 40.1 N
 strong
10 mm 2832 Gs
283.2 mT
 2.09 kg / 4.61 LBS
2092.3 g / 20.5 N
 strong
15 mm 1990 Gs
199.0 mT
 1.03 kg / 2.28 LBS
1033.4 g / 10.1 N
 safe
20 mm 1407 Gs
140.7 mT
 0.52 kg / 1.14 LBS
516.3 g / 5.1 N
 safe
30 mm 745 Gs
74.5 mT
 0.14 kg / 0.32 LBS
144.6 g / 1.4 N
 safe
50 mm 268 Gs
26.8 mT
 0.02 kg / 0.04 LBS
18.7 g / 0.2 N
 safe
Grip strength weakens significantly with every subsequent millimeter of distance. Keep in mind that even a very thin break (e.g., contamination, paint, rust) significantly reduces the pull force. Magnets work strongest during direct contact; air break drastically cuts the power. See how flashily the parameters drop, when the magnet does not touch tightly to the metal substrate. When calculating the assembly, eliminate redundant distances.

Table 2: Shear capacity (vertical surface)
MP 40x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.45 kg / 3.19 LBS
1448.0 g / 14.2 N
1 mm Stal (~0.2) 1.31 kg / 2.88 LBS
1306.0 g / 12.8 N
2 mm Stal (~0.2) 1.17 kg / 2.58 LBS
1172.0 g / 11.5 N
3 mm Stal (~0.2) 1.04 kg / 2.30 LBS
1044.0 g / 10.2 N
5 mm Stal (~0.2) 0.82 kg / 1.80 LBS
818.0 g / 8.0 N
10 mm Stal (~0.2) 0.42 kg / 0.92 LBS
418.0 g / 4.1 N
15 mm Stal (~0.2) 0.21 kg / 0.45 LBS
206.0 g / 2.0 N
20 mm Stal (~0.2) 0.10 kg / 0.23 LBS
104.0 g / 1.0 N
30 mm Stal (~0.2) 0.03 kg / 0.06 LBS
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The following data indicates the approximate weight limit sufficient to start the downward movement of the magnet vertically on a vertical steel wall (assuming typical friction). This value is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 40x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.17 kg / 4.79 LBS
2172.0 g / 21.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.45 kg / 3.19 LBS
1448.0 g / 14.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.72 kg / 1.60 LBS
724.0 g / 7.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.62 kg / 7.98 LBS
3620.0 g / 35.5 N
When placing a element on a vertical surface (e.g., a fridge), it will only hold only about 1/5 of its nominal power. Gravity as well as a weak degree of grip cause that products move down easier than they detach. Want to create a hanger? Consider that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will slide down under a significantly smaller cargo. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
MP 40x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.72 kg / 1.60 LBS
724.0 g / 7.1 N
1 mm
25%
 1.81 kg / 3.99 LBS
1810.0 g / 17.8 N
2 mm
50%
 3.62 kg / 7.98 LBS
3620.0 g / 35.5 N
3 mm
75%
 5.43 kg / 11.97 LBS
5430.0 g / 53.3 N
5 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
10 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
11 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
12 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
A thin metal plate is unable to take in the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a thin surface, the magnetism will pass 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 phenomenon means that on thin elements (e.g., thin profiles), the magnet holds weaker. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MP 40x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
 OK
40 °C -2.2% 7.08 kg / 15.61 LBS
7080.7 g / 69.5 N
 OK
60 °C -4.4% 6.92 kg / 15.26 LBS
6921.4 g / 67.9 N
 OK
80 °C -6.6% 6.76 kg / 14.91 LBS
6762.2 g / 66.3 N
100 °C -28.8% 5.15 kg / 11.36 LBS
5154.9 g / 50.6 N
Ordinary NdFeB products lose strength above the temperature limit. Watch out for overheating – excessive heat can permanently destroy this product. With increasing heat, the magnet's power briefly lowers. Refrain from using this magnet near heat sources higher than its working range. Too high temperature will lead to permanent loss of magnetism.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 40x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 179.94 kg / 396.69 LBS
5 920 Gs
26.99 kg / 59.50 LBS
26991 g / 264.8 N
 N/A
1 mm 171.16 kg / 377.35 LBS
10 277 Gs
25.67 kg / 56.60 LBS
25675 g / 251.9 N
 154.05 kg / 339.62 LBS
~0 Gs
2 mm 162.41 kg / 358.05 LBS
10 011 Gs
24.36 kg / 53.71 LBS
24361 g / 239.0 N
 146.17 kg / 322.24 LBS
~0 Gs
3 mm 153.87 kg / 339.24 LBS
9 744 Gs
23.08 kg / 50.89 LBS
23081 g / 226.4 N
 138.49 kg / 305.31 LBS
~0 Gs
5 mm 137.55 kg / 303.25 LBS
9 213 Gs
20.63 kg / 45.49 LBS
20633 g / 202.4 N
 123.80 kg / 272.92 LBS
~0 Gs
10 mm 101.67 kg / 224.14 LBS
7 921 Gs
15.25 kg / 33.62 LBS
15251 g / 149.6 N
 91.50 kg / 201.73 LBS
~0 Gs
20 mm 52.00 kg / 114.64 LBS
5 665 Gs
7.80 kg / 17.20 LBS
7800 g / 76.5 N
 46.80 kg / 103.18 LBS
~0 Gs
50 mm 6.64 kg / 14.64 LBS
2 025 Gs
1.00 kg / 2.20 LBS
996 g / 9.8 N
 5.98 kg / 13.18 LBS
~0 Gs
60 mm 3.59 kg / 7.92 LBS
1 489 Gs
0.54 kg / 1.19 LBS
539 g / 5.3 N
 3.23 kg / 7.13 LBS
~0 Gs
70 mm 2.03 kg / 4.48 LBS
1 120 Gs
0.30 kg / 0.67 LBS
305 g / 3.0 N
 1.83 kg / 4.03 LBS
~0 Gs
80 mm 1.20 kg / 2.64 LBS
860 Gs
0.18 kg / 0.40 LBS
180 g / 1.8 N
 1.08 kg / 2.38 LBS
~0 Gs
90 mm 0.73 kg / 1.62 LBS
673 Gs
0.11 kg / 0.24 LBS
110 g / 1.1 N
 0.66 kg / 1.46 LBS
~0 Gs
100 mm 0.47 kg / 1.03 LBS
536 Gs
0.07 kg / 0.15 LBS
70 g / 0.7 N
 0.42 kg / 0.92 LBS
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and steel combination. The setup of magnet-to-magnet produces a massive flux and a larger range of operation. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The levitation is a bit weaker than the attraction, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Figures show sliding force of dual identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - precautionary measures
MP 40x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 18.5 cm
Mechanical watch 20 Gs (2.0 mT) 14.5 cm
Mobile device 40 Gs (4.0 mT) 11.0 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
Powerful magnet radiation is a real danger to electronics as well as medical implants. These NdFeB products generate a field that destroys function of digital equipment. Notice: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MP 40x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.84 km/h
(4.68 m/s)
 0.39 J
30 mm 25.31 km/h
(7.03 m/s)
 0.87 J
50 mm 32.33 km/h
(8.98 m/s)
 1.43 J
100 mm 45.65 km/h
(12.68 m/s)
 2.84 J
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

Table 9: Surface protection spec
MP 40x20x5 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MP 40x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 56 325 Mx 563.3 µWb
Pc Coefficient 0.80 High (Stable)
Flux value passing through the pole surface. Essential parameter in coil applications as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 40x20x5 / N38

Environment Effective steel pull Effect
Air (land) 7.24 kg Standard
Water (riverbed) 8.29 kg
(+1.05 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. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

*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

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
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: 030199-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
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The ring magnet with a hole MP 40x20x5 / N38 is created for mechanical fastening, 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. This product with a force of 7.24 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 40x20x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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 key parameter here is the holding force amounting to approximately 7.24 kg (force ~70.98 N). The mounting hole diameter is precisely 20 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 and weaknesses of Nd2Fe14B magnets.

Pros

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for almost ten years – the loss is just ~1% (in theory),
  • Neodymium magnets remain exceptionally resistant to demagnetization caused by external magnetic fields,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which increases force concentration,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the potential of accurate shaping and adaptation to custom requirements, magnetic components can be modeled in a variety of shapes and sizes, which expands the range of possible applications,
  • Significant place in advanced technology sectors – they are used in HDD drives, electric motors, medical equipment, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices

Limitations

What to avoid - cons of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose 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. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products can disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness of at least 10 mm
  • with a plane free of scratches
  • with zero gap (no impurities)
  • under axial application of breakaway force (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

During everyday use, the actual holding force depends on many variables, ranked from the most important:
  • Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Steel type – low-carbon steel attracts best. Alloy admixtures lower magnetic permeability and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Keep away from electronics

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

Respect the power

Be careful. Neodymium magnets act from a long distance and snap with massive power, often quicker than you can move away.

Warning for heart patients

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Threat to electronics

Do not bring magnets near a wallet, computer, or TV. The magnetism can permanently damage these devices and erase data from cards.

Power loss in heat

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

Bone fractures

Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Machining danger

Powder generated during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

No play value

Adult use only. Small elements can be swallowed, leading to severe trauma. Keep away from children and animals.

Allergic reactions

It is widely known that nickel (standard magnet coating) is a potent allergen. If you have an allergy, prevent direct skin contact and select versions in plastic housing.

Material brittleness

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

Important! Details about risks in the article: Magnet Safety Guide.