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MP 22x6x10 / N38 - ring magnet

ring magnet

Catalog no 030394

GTIN/EAN: 5906301812319

5.00

Diameter

22 mm [±0,1 mm]

internal diameter Ø

6 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

26.39 g

Magnetization Direction

↑ axial

Load capacity

13.65 kg / 133.89 N

Magnetic Induction

416.85 mT / 4168 Gs

Coating

[NiCuNi] Nickel

product specifications »

13.95 ZŁ with VAT / pcs + price for transport

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Physical properties - MP 22x6x10 / N38 - ring magnet

Specification / characteristics - MP 22x6x10 / N38 - ring magnet

properties
properties values
Cat. no. 030394
GTIN/EAN 5906301812319
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 22 mm [±0,1 mm]
internal diameter Ø 6 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 26.39 g
Magnetization Direction ↑ axial
Load capacity ~ ? 13.65 kg / 133.89 N
Magnetic Induction ~ ? 416.85 mT / 4168 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 22x6x10 / 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 information represent the direct effect of a physical calculation. Results rely on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MP 22x6x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5864 Gs
586.4 mT
 13.65 kg / 30.09 lbs
13650.0 g / 133.9 N
 critical level
1 mm 5326 Gs
532.6 mT
 11.26 kg / 24.83 lbs
11261.1 g / 110.5 N
 critical level
2 mm 4795 Gs
479.5 mT
 9.13 kg / 20.12 lbs
9127.3 g / 89.5 N
 medium risk
3 mm 4288 Gs
428.8 mT
 7.30 kg / 16.09 lbs
7299.8 g / 71.6 N
 medium risk
5 mm 3381 Gs
338.1 mT
 4.54 kg / 10.01 lbs
4539.0 g / 44.5 N
 medium risk
10 mm 1830 Gs
183.0 mT
 1.33 kg / 2.93 lbs
1329.4 g / 13.0 N
 low risk
15 mm 1039 Gs
103.9 mT
 0.43 kg / 0.95 lbs
428.7 g / 4.2 N
 low risk
20 mm 635 Gs
63.5 mT
 0.16 kg / 0.35 lbs
159.9 g / 1.6 N
 low risk
30 mm 285 Gs
28.5 mT
 0.03 kg / 0.07 lbs
32.1 g / 0.3 N
 low risk
50 mm 90 Gs
9.0 mT
 0.00 kg / 0.01 lbs
3.2 g / 0.0 N
 low risk
Magnetic force weakens sharply with every subsequent millimeter of gap. Remember that even a microscopic distance (e.g., contamination, paint, veneer) significantly reduces the pull force. Neodymiums hold optimally during direct contact; gap nullifies the power. Observe how flashily the load capacity drop, when the magnet does not adhere tightly to the metal substrate. When planning the mounting, avoid additional spacers.

Table 2: Slippage force (vertical surface)
MP 22x6x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.73 kg / 6.02 lbs
2730.0 g / 26.8 N
1 mm Stal (~0.2) 2.25 kg / 4.96 lbs
2252.0 g / 22.1 N
2 mm Stal (~0.2) 1.83 kg / 4.03 lbs
1826.0 g / 17.9 N
3 mm Stal (~0.2) 1.46 kg / 3.22 lbs
1460.0 g / 14.3 N
5 mm Stal (~0.2) 0.91 kg / 2.00 lbs
908.0 g / 8.9 N
10 mm Stal (~0.2) 0.27 kg / 0.59 lbs
266.0 g / 2.6 N
15 mm Stal (~0.2) 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
20 mm Stal (~0.2) 0.03 kg / 0.07 lbs
32.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below shows the theoretical force required to start the sliding of the magnet down on a vertical steel plate (assuming standard friction coefficient). This parameter is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 22x6x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.10 kg / 9.03 lbs
4095.0 g / 40.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.73 kg / 6.02 lbs
2730.0 g / 26.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.37 kg / 3.01 lbs
1365.0 g / 13.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.83 kg / 15.05 lbs
6825.0 g / 67.0 N
When placing a holder on a vertical surface (e.g., a car body), it you can count on only approx. 1/5 of its maximum pull force. Gravitational force and a weak degree of grip cause that magnets slide down faster than they pop off the substrate. Planning a vertical fastening? Remember 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 cargo. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - power losses
MP 22x6x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.68 kg / 1.50 lbs
682.5 g / 6.7 N
1 mm
13%
 1.71 kg / 3.76 lbs
1706.3 g / 16.7 N
2 mm
25%
 3.41 kg / 7.52 lbs
3412.5 g / 33.5 N
3 mm
38%
 5.12 kg / 11.28 lbs
5118.8 g / 50.2 N
5 mm
63%
 8.53 kg / 18.81 lbs
8531.3 g / 83.7 N
10 mm
100%
 13.65 kg / 30.09 lbs
13650.0 g / 133.9 N
11 mm
100%
 13.65 kg / 30.09 lbs
13650.0 g / 133.9 N
12 mm
100%
 13.65 kg / 30.09 lbs
13650.0 g / 133.9 N
A thin metal plate cannot absorb the entire magnetic field, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this magnet's potential, you require a sufficiently solid element of steel. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We advise picking the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - thermal limit
MP 22x6x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 13.65 kg / 30.09 lbs
13650.0 g / 133.9 N
 OK
40 °C -2.2% 13.35 kg / 29.43 lbs
13349.7 g / 131.0 N
 OK
60 °C -4.4% 13.05 kg / 28.77 lbs
13049.4 g / 128.0 N
 OK
80 °C -6.6% 12.75 kg / 28.11 lbs
12749.1 g / 125.1 N
100 °C -28.8% 9.72 kg / 21.43 lbs
9718.8 g / 95.3 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Watch out for overheating – excessive heat can irreversibly destroy this magnet. With every degree above norm, the neodymium's capacity temporarily decreases. Avoid using this magnet close to heaters higher than its safe range. Too high temperature will lead to destruction of magnetism.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MP 22x6x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.34 kg / 119.79 lbs
6 106 Gs
8.15 kg / 17.97 lbs
8151 g / 80.0 N
 N/A
1 mm 49.50 kg / 109.14 lbs
11 193 Gs
7.43 kg / 16.37 lbs
7426 g / 72.8 N
 44.55 kg / 98.22 lbs
~0 Gs
2 mm 44.83 kg / 98.83 lbs
10 652 Gs
6.72 kg / 14.82 lbs
6724 g / 66.0 N
 40.34 kg / 88.94 lbs
~0 Gs
3 mm 40.43 kg / 89.14 lbs
10 116 Gs
6.06 kg / 13.37 lbs
6065 g / 59.5 N
 36.39 kg / 80.22 lbs
~0 Gs
5 mm 32.54 kg / 71.74 lbs
9 075 Gs
4.88 kg / 10.76 lbs
4881 g / 47.9 N
 29.29 kg / 64.57 lbs
~0 Gs
10 mm 18.07 kg / 39.83 lbs
6 762 Gs
2.71 kg / 5.98 lbs
2710 g / 26.6 N
 16.26 kg / 35.85 lbs
~0 Gs
20 mm 5.29 kg / 11.67 lbs
3 660 Gs
0.79 kg / 1.75 lbs
794 g / 7.8 N
 4.76 kg / 10.50 lbs
~0 Gs
50 mm 0.27 kg / 0.60 lbs
828 Gs
0.04 kg / 0.09 lbs
41 g / 0.4 N
 0.24 kg / 0.54 lbs
~0 Gs
60 mm 0.13 kg / 0.28 lbs
569 Gs
0.02 kg / 0.04 lbs
19 g / 0.2 N
 0.12 kg / 0.25 lbs
~0 Gs
70 mm 0.07 kg / 0.15 lbs
408 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
80 mm 0.04 kg / 0.08 lbs
303 Gs
0.01 kg / 0.01 lbs
5 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
90 mm 0.02 kg / 0.05 lbs
231 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
100 mm 0.01 kg / 0.03 lbs
180 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and sheet setup. Such a system of two magnets generates a stronger field and a further horizon of action. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Remember that when attracting two neodymiums, the impact force is extreme. The levitation is slightly lower than the attraction, but still large.
*Flux density in repulsion mode is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Calculations apply to sliding force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - precautionary measures
MP 22x6x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.0 cm
Mechanical watch 20 Gs (2.0 mT) 9.5 cm
Mobile device 40 Gs (4.0 mT) 7.0 cm
Remote 50 Gs (5.0 mT) 6.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field is a large risk to electronic devices and pacemakers. These NdFeB products produce a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MP 22x6x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.29 km/h
(6.75 m/s)
 0.60 J
30 mm 39.79 km/h
(11.05 m/s)
 1.61 J
50 mm 51.30 km/h
(14.25 m/s)
 2.68 J
100 mm 72.53 km/h
(20.15 m/s)
 5.36 J
Magnetic elements are very brittle – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Impact 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 metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
MP 22x6x10 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MP 22x6x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 465 Mx 164.7 µWb
Pc Coefficient 1.13 High (Stable)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MP 22x6x10 / N38

Environment Effective steel pull Effect
Air (land) 13.65 kg Standard
Water (riverbed) 15.63 kg
(+1.98 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Power loss vs temp

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.13

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.

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%
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: 030394-2026
Measurement Calculator
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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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. 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 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.
A screw or bolt with a thread diameter smaller than 6 mm fits this model. 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.
This model is characterized by dimensions Ø22x10 mm and a weight of 26.39 g. The key parameter here is the lifting capacity amounting to approximately 13.65 kg (force ~133.89 N). The mounting hole diameter is precisely 6 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the shiny surface of silver, the element looks attractive,
  • Magnets are distinguished by maximum magnetic induction on the outer side,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • In view of the option of flexible shaping and adaptation to individualized projects, NdFeB magnets can be manufactured in a broad palette of shapes and sizes, which increases their versatility,
  • Universal use in electronics industry – they find application in mass storage devices, drive modules, diagnostic systems, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We recommend cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The specified lifting capacity refers to the peak performance, measured under ideal test conditions, meaning:
  • using a base made of low-carbon steel, functioning as a magnetic yoke
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by even structure
  • with direct contact (without coatings)
  • under axial force direction (90-degree angle)
  • in stable room temperature

Practical aspects of lifting capacity – factors

During everyday use, the actual lifting capacity depends on several key aspects, presented from the most important:
  • Gap (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Plate thickness – too thin plate does not accept the full field, causing part of the flux to be lost into the air.
  • Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

H&S for magnets
Compass and GPS

Remember: neodymium magnets produce a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and GPS.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact and opt for versions in plastic housing.

Magnet fragility

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

Demagnetization risk

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

Handling rules

Be careful. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can move away.

Danger to pacemakers

For implant holders: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or request help to work with the magnets.

Machining danger

Powder produced during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Magnetic media

Data protection: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

This is not a toy

NdFeB magnets are not suitable for play. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.

Crushing force

Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Warning! Details about risks in the article: Safety of working with magnets.