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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 properties »

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 modeling of the product - data

These information represent the direct effect of a engineering analysis. Values were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ. Use these data as a reference point for designers.

Table 1: Static pull force (pull 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 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
 weak grip
30 mm 745 Gs
74.5 mT
 0.39 kg / 0.85 LBS
386.2 g / 3.8 N
 weak grip
50 mm 268 Gs
26.8 mT
 0.05 kg / 0.11 LBS
50.1 g / 0.5 N
 weak grip
Grip strength drops sharply with every mm of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, rust) strongly weakens the grip. Magnetic products hold most effectively during direct contact; gap weakens the power. See how rapidly the load capacity plummet, when the magnet does not adhere 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 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
The following data defines the theoretical holding capacity needed to start the downward movement of the magnet down on a upright steel plate (assuming standard friction). This value varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
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 placing a holder on a upright plane (e.g., a fridge), it will only hold barely approx. 20%-30% of its maximum pull force. Gravity and a weak degree of grip cause that holders move down faster than they pop off the substrate. Designing a hanger? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slide down under a significantly smaller weight. Using a rubber coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
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 metal plate is incapable of conduct the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a too thin substrate, the field will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you require a sufficiently solid element of steel. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the magnet works worse. We recommend selecting the steel cross-section from these parameters.

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 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
Classic neodymiums irreversibly lose power past the thermal threshold. Watch out for overheating – high temperature can irreversibly destroy this product. With every degree above norm, the magnet's power momentarily lowers. Do not use this product near heat sources higher than its operating temperature limit. Too high temperature will cause permanent loss of magnetic properties.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) may lose charge permanently sooner than long magnets. Red status in the table signals 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) Sliding 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 much further distance than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a further horizon of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is marginally weaker than the attraction, but still large.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
* Calculations demonstrate friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
Mobile device 40 Gs (4.0 mT) 11.0 cm
Car key 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 poses a real danger to electronic devices as well as pacemakers. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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
NdFeB products are very brittle – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
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)
Total magnetic flux passing through the magnet pole. Key data for generator designers as well as sensors. Pc value determines 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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds merely ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely weakens 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) = 0.81

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 and environmental data
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%
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
Magnet Unit Converter
Pulling force
Field Strength
Insert your figure into any field, and all other values change in real-time.

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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. 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 does not ensure full waterproofing. 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 magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 22 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 10 mm. The pulling force of this model is an impressive 19.34 kg, which translates to 189.71 N in newtons. 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. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They possess excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
  • Thanks to the glossy finish, the plating of nickel, gold-plated, or silver gives an elegant appearance,
  • Neodymium magnets create maximum magnetic induction on a their surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in designing and the ability to customize to unusual requirements,
  • Versatile presence in modern industrial fields – they are used in hard drives, brushless drives, medical equipment, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's 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.
  • 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 producing threads inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

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

Magnet power was defined for optimal configuration, taking into account:
  • with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • without any insulating layer between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at conditions approx. 20°C

What influences lifting capacity in practice

Please note that the application force may be lower depending on the following factors, in order of importance:
  • Air gap (between the magnet and the plate), because even a very small distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Impact on smartphones

A strong magnetic field negatively affects the operation of magnetometers in phones and GPS navigation. Maintain magnets close to a smartphone to prevent damaging the sensors.

Do not give to children

Always keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are life-threatening.

Respect the power

Handle with care. Neodymium magnets act from a distance and connect with huge force, often faster than you can react.

Nickel allergy

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, avoid direct skin contact and select versions in plastic housing.

Warning for heart patients

Individuals with a ICD must keep an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

Cards and drives

Do not bring magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Pinching danger

Big blocks can break fingers instantly. Do not place your hand between two attracting surfaces.

Fragile material

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Do not overheat magnets

Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Fire warning

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Warning! Details about hazards in the article: Magnet Safety Guide.