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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

product parameters »

40.59 ZŁ with VAT / pcs + price for transport

33.00 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 22 499 98 98 or get in touch using inquiry form our website.
Parameters along with structure of neodymium magnets can be estimated using our force calculator.

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

Technical data - 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 simulation of the assembly - technical parameters

These information constitute the result of a mathematical simulation. Results rely on algorithms for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - characteristics
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
 dangerous!
1 mm 5005 Gs
500.5 mT
 17.46 kg / 38.48 LBS
17455.9 g / 171.2 N
 dangerous!
2 mm 4739 Gs
473.9 mT
 15.65 kg / 34.50 LBS
15647.5 g / 153.5 N
 dangerous!
3 mm 4475 Gs
447.5 mT
 13.95 kg / 30.75 LBS
13950.0 g / 136.8 N
 dangerous!
5 mm 3960 Gs
396.0 mT
 10.93 kg / 24.09 LBS
10927.7 g / 107.2 N
 dangerous!
10 mm 2832 Gs
283.2 mT
 5.59 kg / 12.32 LBS
5589.2 g / 54.8 N
 strong
15 mm 1990 Gs
199.0 mT
 2.76 kg / 6.09 LBS
2760.5 g / 27.1 N
 strong
20 mm 1407 Gs
140.7 mT
 1.38 kg / 3.04 LBS
1379.2 g / 13.5 N
 safe
30 mm 745 Gs
74.5 mT
 0.39 kg / 0.85 LBS
386.2 g / 3.8 N
 safe
50 mm 268 Gs
26.8 mT
 0.05 kg / 0.11 LBS
50.1 g / 0.5 N
 safe
Pulling power drops sharply per each millimeter of gap. Remember that even the smallest gap (e.g., dirt, varnish, rust) strongly diminishes the holding power. Magnetic products operate strongest at the point of direct contact; distance nullifies the force. Notice how flashily the pull force plummet, when the product does not touch flatly to the steel surface. When calculating the mounting, discard additional spacers.

Table 2: Sliding capacity (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 table below defines the estimated weight limit sufficient to cause the downward movement of the magnet down against a vertical steel plate (considering standard friction). This parameter is a function of the distance between the magnet and the metal.

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 placing a element on a vertical wall (e.g., a car body), it you can count on just about 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip mean that holders slip faster than they pop off the substrate. Want to create a hanger? Consider that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter weight. Using a rubber pad can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - 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 too thin steel cannot absorb the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the field will pass right through and the holding will be smaller. To achieve 100% of this neodymium's potential, you need a suitably thick backing of steel. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the product holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - 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
Classic neodymiums change their properties strength above the temperature limit. Protect against heat – high temperature can permanently destroy this product. As the temperature rises, the magnet's power temporarily drops. Avoid using this product close to ovens higher than its working range. Too high temperature will result in permanent loss of magnetism.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnets attract each other from a much further distance than a magnet and sheet combination. The connection of two magnets generates a stronger field and a larger range of operation. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the collision energy is massive. The repulsion force is marginally weaker than the connection force, but still large.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Attention: Figures show friction force of two same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
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
A strong magnetic field is a real danger to electronics and medical implants. These magnets generate a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and housings. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
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 prone to chipping – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

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 emitted by the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient determines the working geometry.

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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

*For standard magnets, 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

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
Chemical composition
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: 030344-2026
Magnet Unit Converter
Magnet pull force
Magnetic Induction
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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 19.34 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
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. When tightening the screw, you must maintain caution. 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. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. 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. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. 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.
This model is characterized by dimensions Ø40x10 mm and a weight of 65.74 g. The key parameter here is the lifting capacity amounting to approximately 19.34 kg (force ~189.71 N). The mounting hole diameter is precisely 22 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of rare earth magnets.

Advantages

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • By covering with a smooth layer of nickel, the element gains an elegant look,
  • Magnets are distinguished by huge magnetic induction on the surface,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the ability to adapt to specific needs,
  • Huge importance in advanced technology sectors – they are commonly used in hard drives, motor assemblies, medical equipment, and other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

Information about lifting capacity was defined for the most favorable conditions, including:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Effective lifting capacity impacted by working environment parameters, such as (from priority):
  • Distance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Metal type – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Handling rules

Use magnets with awareness. Their immense force can surprise even experienced users. Be vigilant and respect their power.

Metal Allergy

Some people suffer from a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Extended handling may cause an allergic reaction. We recommend wear protective gloves.

Implant safety

For implant holders: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Data carriers

Device Safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Fire risk

Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Permanent damage

Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Physical harm

Protect your hands. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Material brittleness

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

Do not give to children

Neodymium magnets are not suitable for play. Swallowing multiple magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.

Magnetic interference

Note: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?