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MP 40x22x10 / N38 - ring magnet

ring magnet

Catalog no 030344

GTIN/EAN: 5906301812296

5.00
Load capacity 19.34 kg / 189.71 N Magnetic Induction 277.22 mT / 2772 Gs
Diameter
40 mm [±0,1 mm]
internal diameter Ø
22 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
65.74 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
product parameters »

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Parameters as well as structure of magnets can be reviewed using our power calculator.

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Physical properties - MP 40x22x10 / N38 - ring magnet

Specification / characteristics - MP 40x22x10 / N38 - ring magnet

properties
properties values
Cat. no. 030344
GTIN/EAN 5906301812296
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 22 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 65.74 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.34 kg / 189.71 N
Magnetic Induction ~ ? 277.22 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 40x22x10 / 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 modeling of the magnet - technical parameters

These data constitute the outcome of a engineering analysis. Values are based on models for the material Nd2Fe14B. Real-world performance might slightly differ. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - power drop
MP 40x22x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5269 Gs
526.9 mT
 19.34 kg / 42.64 LBS
19340.0 g / 189.7 N
 crushing
1 mm 5005 Gs
500.5 mT
 17.46 kg / 38.48 LBS
17455.9 g / 171.2 N
 crushing
2 mm 4739 Gs
473.9 mT
 15.65 kg / 34.50 LBS
15647.5 g / 153.5 N
 crushing
3 mm 4475 Gs
447.5 mT
 13.95 kg / 30.75 LBS
13950.0 g / 136.8 N
 crushing
5 mm 3960 Gs
396.0 mT
 10.93 kg / 24.09 LBS
10927.7 g / 107.2 N
 crushing
10 mm 2832 Gs
283.2 mT
 5.59 kg / 12.32 LBS
5589.2 g / 54.8 N
 warning
15 mm 1990 Gs
199.0 mT
 2.76 kg / 6.09 LBS
2760.5 g / 27.1 N
 warning
20 mm 1407 Gs
140.7 mT
 1.38 kg / 3.04 LBS
1379.2 g / 13.5 N
 low risk
30 mm 745 Gs
74.5 mT
 0.39 kg / 0.85 LBS
386.2 g / 3.8 N
 low risk
50 mm 268 Gs
26.8 mT
 0.05 kg / 0.11 LBS
50.1 g / 0.5 N
 low risk
Pulling power weakens sharply with every mm of distance. Remember that even the smallest gap (e.g., dirt, varnish, dust) significantly reduces the pull force. Neodymiums work optimally in perfect adhesion; air break nullifies the power. See how quickly the load capacity fall, when the magnet does not touch flatly to the steel surface. When planning the mounting, avoid redundant distances.

Table 2: Sliding load (wall)
MP 40x22x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.87 kg / 8.53 LBS
3868.0 g / 37.9 N
1 mm Stal (~0.2) 3.49 kg / 7.70 LBS
3492.0 g / 34.3 N
2 mm Stal (~0.2) 3.13 kg / 6.90 LBS
3130.0 g / 30.7 N
3 mm Stal (~0.2) 2.79 kg / 6.15 LBS
2790.0 g / 27.4 N
5 mm Stal (~0.2) 2.19 kg / 4.82 LBS
2186.0 g / 21.4 N
10 mm Stal (~0.2) 1.12 kg / 2.46 LBS
1118.0 g / 11.0 N
15 mm Stal (~0.2) 0.55 kg / 1.22 LBS
552.0 g / 5.4 N
20 mm Stal (~0.2) 0.28 kg / 0.61 LBS
276.0 g / 2.7 N
30 mm Stal (~0.2) 0.08 kg / 0.17 LBS
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N
This section presents the estimated shear load needed to cause the shifting of the magnet downwards along a upright steel plate (assuming typical friction coefficient). This value depends on the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 40x22x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.80 kg / 12.79 LBS
5802.0 g / 56.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.87 kg / 8.53 LBS
3868.0 g / 37.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.93 kg / 4.26 LBS
1934.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.67 kg / 21.32 LBS
9670.0 g / 94.9 N
When mounting a magnet on a upright wall (e.g., a board), it will only hold barely about 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that magnets slip faster than they pull off. Designing a wall mount? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a much lighter weight. Application of an anti-slip pad can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 40x22x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.97 kg / 2.13 LBS
967.0 g / 9.5 N
1 mm
13%
 2.42 kg / 5.33 LBS
2417.5 g / 23.7 N
2 mm
25%
 4.84 kg / 10.66 LBS
4835.0 g / 47.4 N
3 mm
38%
 7.25 kg / 15.99 LBS
7252.5 g / 71.1 N
5 mm
63%
 12.09 kg / 26.65 LBS
12087.5 g / 118.6 N
10 mm
100%
 19.34 kg / 42.64 LBS
19340.0 g / 189.7 N
11 mm
100%
 19.34 kg / 42.64 LBS
19340.0 g / 189.7 N
12 mm
100%
 19.34 kg / 42.64 LBS
19340.0 g / 189.7 N
A thin sheet is not enough to absorb the entire magnetic field, which wastes potential of the magnet. Should you attach a powerful product to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To utilize 100% of this neodymium's power, you require a sufficiently solid backing of metal. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the holder holds weaker. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MP 40x22x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.34 kg / 42.64 LBS
19340.0 g / 189.7 N
 OK
40 °C -2.2% 18.91 kg / 41.70 LBS
18914.5 g / 185.6 N
 OK
60 °C -4.4% 18.49 kg / 40.76 LBS
18489.0 g / 181.4 N
 OK
80 °C -6.6% 18.06 kg / 39.82 LBS
18063.6 g / 177.2 N
100 °C -28.8% 13.77 kg / 30.36 LBS
13770.1 g / 135.1 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this magnet. With every degree above norm, the neodymium's force temporarily decreases. Avoid using this magnet close to heaters exceeding its working range. Ignoring the limit will lead to destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
MP 40x22x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 171.37 kg / 377.80 LBS
5 920 Gs
25.71 kg / 56.67 LBS
25705 g / 252.2 N
 N/A
1 mm 163.01 kg / 359.38 LBS
10 277 Gs
24.45 kg / 53.91 LBS
24452 g / 239.9 N
 146.71 kg / 323.44 LBS
~0 Gs
2 mm 154.67 kg / 341.00 LBS
10 011 Gs
23.20 kg / 51.15 LBS
23201 g / 227.6 N
 139.21 kg / 306.90 LBS
~0 Gs
3 mm 146.55 kg / 323.08 LBS
9 744 Gs
21.98 kg / 48.46 LBS
21982 g / 215.6 N
 131.89 kg / 290.77 LBS
~0 Gs
5 mm 131.00 kg / 288.81 LBS
9 213 Gs
19.65 kg / 43.32 LBS
19650 g / 192.8 N
 117.90 kg / 259.92 LBS
~0 Gs
10 mm 96.83 kg / 213.47 LBS
7 921 Gs
14.52 kg / 32.02 LBS
14524 g / 142.5 N
 87.15 kg / 192.12 LBS
~0 Gs
20 mm 49.53 kg / 109.18 LBS
5 665 Gs
7.43 kg / 16.38 LBS
7429 g / 72.9 N
 44.57 kg / 98.27 LBS
~0 Gs
50 mm 6.33 kg / 13.95 LBS
2 025 Gs
0.95 kg / 2.09 LBS
949 g / 9.3 N
 5.69 kg / 12.55 LBS
~0 Gs
60 mm 3.42 kg / 7.55 LBS
1 489 Gs
0.51 kg / 1.13 LBS
513 g / 5.0 N
 3.08 kg / 6.79 LBS
~0 Gs
70 mm 1.94 kg / 4.27 LBS
1 120 Gs
0.29 kg / 0.64 LBS
290 g / 2.8 N
 1.74 kg / 3.84 LBS
~0 Gs
80 mm 1.14 kg / 2.52 LBS
860 Gs
0.17 kg / 0.38 LBS
171 g / 1.7 N
 1.03 kg / 2.27 LBS
~0 Gs
90 mm 0.70 kg / 1.54 LBS
673 Gs
0.10 kg / 0.23 LBS
105 g / 1.0 N
 0.63 kg / 1.39 LBS
~0 Gs
100 mm 0.44 kg / 0.98 LBS
536 Gs
0.07 kg / 0.15 LBS
67 g / 0.7 N
 0.40 kg / 0.88 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a neodymium and metal setup. The connection of two magnets creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density between like poles reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
Note: Calculations demonstrate sliding force of dual same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 40x22x10 / 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
Timepiece 20 Gs (2.0 mT) 14.5 cm
Phone / Smartphone 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 and pacemakers. These NdFeB products generate a flux that destroys function of digital equipment. Be aware: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MP 40x22x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.05 km/h
(5.85 m/s)
 1.12 J
30 mm 24.27 km/h
(6.74 m/s)
 1.49 J
50 mm 24.52 km/h
(6.81 m/s)
 1.52 J
100 mm 24.57 km/h
(6.82 m/s)
 1.53 J
Magnetic elements are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with large magnets.

Table 9: Anti-corrosion coating durability
MP 40x22x10 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 40x22x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 54 070 Mx 540.7 µWb
Pc Coefficient 0.81 High (Stable)
Flux value emitted by the pole surface. Essential parameter for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 40x22x10 / N38

Environment Effective steel pull Effect
Air (land) 19.34 kg Standard
Water (riverbed) 22.14 kg
(+2.80 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.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Vertical hold

*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.81

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 specification and ecology

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: 030344-2026
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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. This product with a force of 19.34 kg works great as a door latch, speaker holder, or spacer 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 caution. 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 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.
The presented product is a ring magnet with dimensions Ø40 mm (outer diameter) and height 10 mm. The key parameter here is the holding force amounting to approximately 19.34 kg (force ~189.71 N). The mounting hole diameter is precisely 22 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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 neodymium magnets.

Pros

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by external field influence,
  • A magnet with a metallic gold surface looks better,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in designing and the ability to customize to unusual requirements,
  • Versatile presence in innovative solutions – they are utilized in mass storage devices, electric drive systems, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Disadvantages

Cons of neodymium magnets: tips and applications.
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • 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.
  • Limited ability of making threads in the magnet and complex forms - preferred is cover - magnet mounting.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics 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

Best holding force of the magnet in ideal parameters – what affects it?

The load parameter shown represents the peak performance, measured under ideal test conditions, meaning:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

Key elements affecting lifting force

In practice, the real power is determined by several key aspects, presented from crucial:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick plate does not accept the full field, causing part of the power to be escaped to the other side.
  • Metal type – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
Serious injuries

Risk of injury: The pulling power is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Protect data

Avoid bringing magnets near a purse, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Sensitization to coating

Some people suffer from a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling might lead to skin redness. We strongly advise wear protective gloves.

Thermal limits

Do not overheat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

ICD Warning

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.

Precision electronics

Be aware: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and GPS.

Handling rules

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Stay alert and do not underestimate their power.

Shattering risk

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Dust explosion hazard

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Adults only

Neodymium magnets are not intended for children. Swallowing multiple magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates urgent medical intervention.

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