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MP 40x22x10 / N38 - ring magnet

ring magnet

Catalog no 030344

GTIN/EAN: 5906301812296

5.00

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

see parameters »

40.59 ZŁ with VAT / pcs + price for transport

33.00 ZŁ net + 23% VAT / pcs

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Detailed specification - 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 analysis of the magnet - data

The following data represent the result of a engineering analysis. Values were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these data as a reference point for designers.

Table 1: Static force (force vs distance) - interaction chart
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 pounds
19340.0 g / 189.7 N
 crushing
1 mm 5005 Gs
500.5 mT
 17.46 kg / 38.48 pounds
17455.9 g / 171.2 N
 crushing
2 mm 4739 Gs
473.9 mT
 15.65 kg / 34.50 pounds
15647.5 g / 153.5 N
 crushing
3 mm 4475 Gs
447.5 mT
 13.95 kg / 30.75 pounds
13950.0 g / 136.8 N
 crushing
5 mm 3960 Gs
396.0 mT
 10.93 kg / 24.09 pounds
10927.7 g / 107.2 N
 crushing
10 mm 2832 Gs
283.2 mT
 5.59 kg / 12.32 pounds
5589.2 g / 54.8 N
 strong
15 mm 1990 Gs
199.0 mT
 2.76 kg / 6.09 pounds
2760.5 g / 27.1 N
 strong
20 mm 1407 Gs
140.7 mT
 1.38 kg / 3.04 pounds
1379.2 g / 13.5 N
 safe
30 mm 745 Gs
74.5 mT
 0.39 kg / 0.85 pounds
386.2 g / 3.8 N
 safe
50 mm 268 Gs
26.8 mT
 0.05 kg / 0.11 pounds
50.1 g / 0.5 N
 safe
Grip strength weakens drastically with every mm of spacing. Note that even the smallest gap (e.g., dirt, varnish, dust) strongly diminishes the holding power. Magnets hold most effectively in perfect adhesion; air break drastically cuts the force. See how quickly the parameters drop, when the magnet does not touch directly to the metal substrate. When calculating the mounting, avoid additional spacers.

Table 2: Shear load (vertical surface)
MP 40x22x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.87 kg / 8.53 pounds
3868.0 g / 37.9 N
1 mm Stal (~0.2) 3.49 kg / 7.70 pounds
3492.0 g / 34.3 N
2 mm Stal (~0.2) 3.13 kg / 6.90 pounds
3130.0 g / 30.7 N
3 mm Stal (~0.2) 2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
5 mm Stal (~0.2) 2.19 kg / 4.82 pounds
2186.0 g / 21.4 N
10 mm Stal (~0.2) 1.12 kg / 2.46 pounds
1118.0 g / 11.0 N
15 mm Stal (~0.2) 0.55 kg / 1.22 pounds
552.0 g / 5.4 N
20 mm Stal (~0.2) 0.28 kg / 0.61 pounds
276.0 g / 2.7 N
30 mm Stal (~0.2) 0.08 kg / 0.17 pounds
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
The following data defines the theoretical holding capacity needed to initiate the slippage of the magnet down against a vertical steel wall (assuming standard friction). This value is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (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 pounds
5802.0 g / 56.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.87 kg / 8.53 pounds
3868.0 g / 37.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.93 kg / 4.26 pounds
1934.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.67 kg / 21.32 pounds
9670.0 g / 94.9 N
When placing a magnet on a upright wall (e.g., a car body), it you can count on only approx. 20%-30% of its maximum pull force. Gravity and a low friction coefficient cause that magnets slip faster than they detach. Planning a wall mount? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a significantly smaller cargo. Using a rubber layer can effectively 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 pounds
967.0 g / 9.5 N
1 mm
13%
 2.42 kg / 5.33 pounds
2417.5 g / 23.7 N
2 mm
25%
 4.84 kg / 10.66 pounds
4835.0 g / 47.4 N
3 mm
38%
 7.25 kg / 15.99 pounds
7252.5 g / 71.1 N
5 mm
63%
 12.09 kg / 26.65 pounds
12087.5 g / 118.6 N
10 mm
100%
 19.34 kg / 42.64 pounds
19340.0 g / 189.7 N
11 mm
100%
 19.34 kg / 42.64 pounds
19340.0 g / 189.7 N
12 mm
100%
 19.34 kg / 42.64 pounds
19340.0 g / 189.7 N
A too thin steel is incapable of conduct the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this magnet's potential, you need a suitably thick backing of metal. The saturation effect causes that on thin elements (e.g., car bodies), the magnet works worse. We advise picking the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - resistance threshold
MP 40x22x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.34 kg / 42.64 pounds
19340.0 g / 189.7 N
 OK
40 °C -2.2% 18.91 kg / 41.70 pounds
18914.5 g / 185.6 N
 OK
60 °C -4.4% 18.49 kg / 40.76 pounds
18489.0 g / 181.4 N
 OK
80 °C -6.6% 18.06 kg / 39.82 pounds
18063.6 g / 177.2 N
100 °C -28.8% 13.77 kg / 30.36 pounds
13770.1 g / 135.1 N
Standard neodymium magnets change their properties parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly destroy this product. With increasing heat, the magnet's power temporarily drops. Avoid using this magnet in hot environments higher than its operating temperature limit. Too high temperature will lead to permanent loss of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization sooner than taller cylinders. Red status in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MP 40x22x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 171.37 kg / 377.80 pounds
5 920 Gs
25.71 kg / 56.67 pounds
25705 g / 252.2 N
 N/A
1 mm 163.01 kg / 359.38 pounds
10 277 Gs
24.45 kg / 53.91 pounds
24452 g / 239.9 N
 146.71 kg / 323.44 pounds
~0 Gs
2 mm 154.67 kg / 341.00 pounds
10 011 Gs
23.20 kg / 51.15 pounds
23201 g / 227.6 N
 139.21 kg / 306.90 pounds
~0 Gs
3 mm 146.55 kg / 323.08 pounds
9 744 Gs
21.98 kg / 48.46 pounds
21982 g / 215.6 N
 131.89 kg / 290.77 pounds
~0 Gs
5 mm 131.00 kg / 288.81 pounds
9 213 Gs
19.65 kg / 43.32 pounds
19650 g / 192.8 N
 117.90 kg / 259.92 pounds
~0 Gs
10 mm 96.83 kg / 213.47 pounds
7 921 Gs
14.52 kg / 32.02 pounds
14524 g / 142.5 N
 87.15 kg / 192.12 pounds
~0 Gs
20 mm 49.53 kg / 109.18 pounds
5 665 Gs
7.43 kg / 16.38 pounds
7429 g / 72.9 N
 44.57 kg / 98.27 pounds
~0 Gs
50 mm 6.33 kg / 13.95 pounds
2 025 Gs
0.95 kg / 2.09 pounds
949 g / 9.3 N
 5.69 kg / 12.55 pounds
~0 Gs
60 mm 3.42 kg / 7.55 pounds
1 489 Gs
0.51 kg / 1.13 pounds
513 g / 5.0 N
 3.08 kg / 6.79 pounds
~0 Gs
70 mm 1.94 kg / 4.27 pounds
1 120 Gs
0.29 kg / 0.64 pounds
290 g / 2.8 N
 1.74 kg / 3.84 pounds
~0 Gs
80 mm 1.14 kg / 2.52 pounds
860 Gs
0.17 kg / 0.38 pounds
171 g / 1.7 N
 1.03 kg / 2.27 pounds
~0 Gs
90 mm 0.70 kg / 1.54 pounds
673 Gs
0.10 kg / 0.23 pounds
105 g / 1.0 N
 0.63 kg / 1.39 pounds
~0 Gs
100 mm 0.44 kg / 0.98 pounds
536 Gs
0.07 kg / 0.15 pounds
67 g / 0.7 N
 0.40 kg / 0.88 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of performance. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is massive. The repulsion force is slightly lower than the connection force, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Estimates refer to sliding force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

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
Mechanical watch 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
A strong magnetic field is a real danger to IT equipment as well as pacemakers. These neodymiums produce a flux that destroys function of digital equipment. Be aware: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.18 km/h
(5.61 m/s)
 1.03 J
30 mm 30.33 km/h
(8.43 m/s)
 2.33 J
50 mm 38.74 km/h
(10.76 m/s)
 3.81 J
100 mm 54.70 km/h
(15.20 m/s)
 7.59 J
Magnetic elements are very brittle – a violent impact against metal causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when playing 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 54 070 Mx 540.7 µWb
Pc Coefficient 0.81 High (Stable)
Total magnetic flux emitted by the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly reduces 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) = 0.81

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 specification and ecology
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%
Environmental data
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. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 40x22x10 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable 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. This product is dedicated for indoor 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 pulling force of this model is an impressive 19.34 kg, which translates to 189.71 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
  • They are resistant to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the aesthetic finish of gold, the element gains visual value,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Considering the possibility of flexible shaping and customization to custom projects, magnetic components can be created in a wide range of geometric configurations, which amplifies use scope,
  • Wide application in high-tech industry – they find application in hard drives, drive modules, advanced medical instruments, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

Magnet power was defined for ideal contact conditions, including:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a surface free of scratches
  • with zero gap (no coatings)
  • during detachment in a direction vertical to the mounting surface
  • at standard ambient temperature

What influences lifting capacity in practice

Holding efficiency is affected by specific conditions, including (from most important):
  • Clearance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Combustion hazard

Powder generated during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Safe distance

Do not bring magnets near a wallet, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Danger to the youngest

Product intended for adults. Small elements pose a choking risk, leading to serious injuries. Store away from children and animals.

Life threat

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Crushing force

Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Compass and GPS

A powerful magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Keep magnets near a smartphone to prevent damaging the sensors.

Allergic reactions

Medical facts indicate that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for encased magnets.

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Fragile material

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Immense force

Use magnets with awareness. Their huge power can surprise even experienced users. Plan your moves and respect their power.

Safety First! Need more info? Read our article: Are neodymium magnets dangerous?