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MP 30x6x10 / N38 - ring magnet

ring magnet

Catalog no 030197

GTIN/EAN: 5906301812142

5.00

Diameter

30 mm [±0,1 mm]

internal diameter Ø

6 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

50.89 g

Magnetization Direction

↑ axial

Load capacity

20.71 kg / 203.16 N

Magnetic Induction

343.81 mT / 3438 Gs

Coating

[NiCuNi] Nickel

see specifications »

16.00 ZŁ with VAT / pcs + price for transport

13.01 ZŁ net + 23% VAT / pcs

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Technical parameters - MP 30x6x10 / N38 - ring magnet

Specification / characteristics - MP 30x6x10 / N38 - ring magnet

properties
properties values
Cat. no. 030197
GTIN/EAN 5906301812142
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 30 mm [±0,1 mm]
internal diameter Ø 6 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 50.89 g
Magnetization Direction ↑ axial
Load capacity ~ ? 20.71 kg / 203.16 N
Magnetic Induction ~ ? 343.81 mT / 3438 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 30x6x10 / 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

Physical analysis of the product - technical parameters

The following values represent the direct effect of a mathematical simulation. Values rely on models for the material Nd2Fe14B. Real-world conditions might slightly differ. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
MP 30x6x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5619 Gs
561.9 mT
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
 critical level
1 mm 5241 Gs
524.1 mT
 18.01 kg / 39.71 lbs
18011.7 g / 176.7 N
 critical level
2 mm 4861 Gs
486.1 mT
 15.50 kg / 34.17 lbs
15498.1 g / 152.0 N
 critical level
3 mm 4490 Gs
449.0 mT
 13.22 kg / 29.15 lbs
13223.5 g / 129.7 N
 critical level
5 mm 3792 Gs
379.2 mT
 9.43 kg / 20.79 lbs
9429.0 g / 92.5 N
 strong
10 mm 2404 Gs
240.4 mT
 3.79 kg / 8.36 lbs
3791.3 g / 37.2 N
 strong
15 mm 1526 Gs
152.6 mT
 1.53 kg / 3.37 lbs
1527.0 g / 15.0 N
 low risk
20 mm 1000 Gs
100.0 mT
 0.66 kg / 1.45 lbs
655.5 g / 6.4 N
 low risk
30 mm 482 Gs
48.2 mT
 0.15 kg / 0.34 lbs
152.6 g / 1.5 N
 low risk
50 mm 161 Gs
16.1 mT
 0.02 kg / 0.04 lbs
17.0 g / 0.2 N
 low risk
Pulling power weakens drastically per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, varnish, veneer) significantly reduces the pull force. Neodymiums operate optimally in perfect adhesion; distance weakens the power. Observe how quickly the pull force fall, when the product does not touch directly to the steel surface. When calculating the arrangement, discard redundant distances.

Table 2: Slippage force (vertical surface)
MP 30x6x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.14 kg / 9.13 lbs
4142.0 g / 40.6 N
1 mm Stal (~0.2) 3.60 kg / 7.94 lbs
3602.0 g / 35.3 N
2 mm Stal (~0.2) 3.10 kg / 6.83 lbs
3100.0 g / 30.4 N
3 mm Stal (~0.2) 2.64 kg / 5.83 lbs
2644.0 g / 25.9 N
5 mm Stal (~0.2) 1.89 kg / 4.16 lbs
1886.0 g / 18.5 N
10 mm Stal (~0.2) 0.76 kg / 1.67 lbs
758.0 g / 7.4 N
15 mm Stal (~0.2) 0.31 kg / 0.67 lbs
306.0 g / 3.0 N
20 mm Stal (~0.2) 0.13 kg / 0.29 lbs
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.07 lbs
30.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
This section indicates the theoretical holding capacity needed to start the slippage of the magnet down on a vertical metal surface (assuming standard friction). This parameter is a function of the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MP 30x6x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.21 kg / 13.70 lbs
6213.0 g / 60.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.14 kg / 9.13 lbs
4142.0 g / 40.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.07 kg / 4.57 lbs
2071.0 g / 20.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.36 kg / 22.83 lbs
10355.0 g / 101.6 N
When placing a element on a upright plane (e.g., a fridge), it will maintain only approx. 1/5 of its nominal power. Gravity and a low friction coefficient cause that magnets slip easier than they pop off the substrate. Designing a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the holder will slip down under a much lighter cargo. Application of an anti-slip layer can drastically improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MP 30x6x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.04 kg / 2.28 lbs
1035.5 g / 10.2 N
1 mm
13%
 2.59 kg / 5.71 lbs
2588.8 g / 25.4 N
2 mm
25%
 5.18 kg / 11.41 lbs
5177.5 g / 50.8 N
3 mm
38%
 7.77 kg / 17.12 lbs
7766.3 g / 76.2 N
5 mm
63%
 12.94 kg / 28.54 lbs
12943.8 g / 127.0 N
10 mm
100%
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
11 mm
100%
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
12 mm
100%
 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
A too thin steel is not enough to absorb the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a weak sheet, the field will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation means that on sheet metal structures (e.g., car bodies), the product works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MP 30x6x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.71 kg / 45.66 lbs
20710.0 g / 203.2 N
 OK
40 °C -2.2% 20.25 kg / 44.65 lbs
20254.4 g / 198.7 N
 OK
60 °C -4.4% 19.80 kg / 43.65 lbs
19798.8 g / 194.2 N
 OK
80 °C -6.6% 19.34 kg / 42.64 lbs
19343.1 g / 189.8 N
100 °C -28.8% 14.75 kg / 32.51 lbs
14745.5 g / 144.7 N
Standard neodymium magnets change their properties power past the thermal threshold. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. With increasing heat, the magnet's force temporarily lowers. Avoid using this magnet close to ovens higher than its safe range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MP 30x6x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 103.97 kg / 229.22 lbs
6 035 Gs
15.60 kg / 34.38 lbs
15596 g / 153.0 N
 N/A
1 mm 97.15 kg / 214.17 lbs
10 864 Gs
14.57 kg / 32.13 lbs
14572 g / 143.0 N
 87.43 kg / 192.75 lbs
~0 Gs
2 mm 90.42 kg / 199.35 lbs
10 481 Gs
13.56 kg / 29.90 lbs
13564 g / 133.1 N
 81.38 kg / 179.42 lbs
~0 Gs
3 mm 83.97 kg / 185.13 lbs
10 100 Gs
12.60 kg / 27.77 lbs
12596 g / 123.6 N
 75.57 kg / 166.61 lbs
~0 Gs
5 mm 71.94 kg / 158.60 lbs
9 349 Gs
10.79 kg / 23.79 lbs
10791 g / 105.9 N
 64.75 kg / 142.74 lbs
~0 Gs
10 mm 47.34 kg / 104.36 lbs
7 583 Gs
7.10 kg / 15.65 lbs
7100 g / 69.7 N
 42.60 kg / 93.92 lbs
~0 Gs
20 mm 19.03 kg / 41.96 lbs
4 809 Gs
2.86 kg / 6.29 lbs
2855 g / 28.0 N
 17.13 kg / 37.77 lbs
~0 Gs
50 mm 1.53 kg / 3.37 lbs
1 363 Gs
0.23 kg / 0.51 lbs
229 g / 2.2 N
 1.38 kg / 3.03 lbs
~0 Gs
60 mm 0.77 kg / 1.69 lbs
965 Gs
0.11 kg / 0.25 lbs
115 g / 1.1 N
 0.69 kg / 1.52 lbs
~0 Gs
70 mm 0.41 kg / 0.90 lbs
706 Gs
0.06 kg / 0.14 lbs
61 g / 0.6 N
 0.37 kg / 0.81 lbs
~0 Gs
80 mm 0.23 kg / 0.51 lbs
531 Gs
0.03 kg / 0.08 lbs
35 g / 0.3 N
 0.21 kg / 0.46 lbs
~0 Gs
90 mm 0.14 kg / 0.30 lbs
409 Gs
0.02 kg / 0.05 lbs
21 g / 0.2 N
 0.12 kg / 0.27 lbs
~0 Gs
100 mm 0.09 kg / 0.19 lbs
322 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
 0.08 kg / 0.17 lbs
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the impact force is huge. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density for N-N configuration reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Figures apply to friction force of dual same magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
MP 30x6x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.5 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Mechanical watch 20 Gs (2.0 mT) 12.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Remote 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Extremely neodym field poses a serious hazard to IT equipment as well as pacemakers. These NdFeB products generate a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MP 30x6x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.55 km/h
(6.26 m/s)
 1.00 J
30 mm 35.40 km/h
(9.83 m/s)
 2.46 J
50 mm 45.52 km/h
(12.64 m/s)
 4.07 J
100 mm 64.34 km/h
(17.87 m/s)
 8.13 J
Magnetic elements are very brittle – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (durability)
MP 30x6x10 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MP 30x6x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 31 585 Mx 315.8 µWb
Pc Coefficient 0.96 High (Stable)
Total magnetic flux passing through the magnet pole. Key data for generator designers as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MP 30x6x10 / N38

Environment Effective steel pull Effect
Air (land) 20.71 kg Standard
Water (riverbed) 23.71 kg
(+3.00 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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. Shear force

*Warning: On a vertical wall, the magnet holds just a fraction of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Thermal stability

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.96

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
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%
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: 030197-2026
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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. Mounting is clean and reversible, unlike gluing. This product with a force of 20.71 kg works great as a door latch, speaker holder, or mounting element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer 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. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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. Always check that the screw head is not larger than the outer diameter of the magnet (30 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 30 mm and thickness 10 mm. The pulling force of this model is an impressive 20.71 kg, which translates to 203.16 N in newtons. 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.

Pros as well as cons of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties due to external fields,
  • A magnet with a shiny nickel surface looks better,
  • Magnetic induction on the working layer of the magnet turns out to be exceptional,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to freedom in forming and the ability to customize to client solutions,
  • Fundamental importance in modern industrial fields – they are used in data components, electric drive systems, precision medical tools, also technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves 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 power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating nuts and complex shapes in magnets, we propose using casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

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

The specified lifting capacity represents the limit force, recorded under optimal environment, specifically:
  • on a base made of structural steel, perfectly concentrating the magnetic flux
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with a surface free of scratches
  • under conditions of no distance (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • in neutral thermal conditions

Determinants of lifting force in real conditions

It is worth knowing that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength 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.
  • Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the holding force.

Warnings
Data carriers

Data protection: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Phone sensors

A powerful magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a device to prevent breaking the sensors.

Medical implants

People with a heart stimulator must keep an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.

Allergic reactions

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness appears, cease handling magnets and wear gloves.

Physical harm

Danger of trauma: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Fire warning

Dust generated during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Eye protection

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Do not give to children

Neodymium magnets are not toys. Eating a few magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates urgent medical intervention.

Thermal limits

Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Do not underestimate power

Handle magnets consciously. Their immense force can shock even professionals. Plan your moves and do not underestimate their force.

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