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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

16.00 with VAT / pcs + price for transport

13.01 ZŁ net + 23% VAT / pcs

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Product card - 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 modeling of the assembly - report

The following values constitute the result of a mathematical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - 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
weak grip
20 mm 1000 Gs
100.0 mT
0.66 kg / 1.45 LBS
655.5 g / 6.4 N
weak grip
30 mm 482 Gs
48.2 mT
0.15 kg / 0.34 LBS
152.6 g / 1.5 N
weak grip
50 mm 161 Gs
16.1 mT
0.02 kg / 0.04 LBS
17.0 g / 0.2 N
weak grip

Table 2: Vertical hold (wall)
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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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

Table 4: Material efficiency (substrate influence) - sheet metal selection
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

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

Table 6: Two magnets (attraction) - forces in the system
MP 30x6x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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

Table 7: Protective zones (electronics) - warnings
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
Timepiece 20 Gs (2.0 mT) 12.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Car key 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

Table 8: Collisions (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

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)

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

Parameter Value SI Unit / Description
Magnetic Flux 31 585 Mx 315.8 µWb
Pc Coefficient 0.96 High (Stable)

Table 11: Hydrostatics and buoyancy
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Note: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Steel saturation

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

3. Thermal stability

*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) = 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.

Technical and environmental data
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%
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
Measurement Calculator
Force (pull)

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. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. 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. 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. 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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders 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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø30 mm (outer diameter) and height 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.
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.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are exceptionally resistant to demagnetization caused by magnetic disturbances,
  • In other words, due to the aesthetic surface of nickel, the element is aesthetically pleasing,
  • Magnets have impressive magnetic induction on the outer side,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • In view of the possibility of precise shaping and adaptation to individualized solutions, magnetic components can be modeled in a variety of shapes and sizes, which amplifies use scope,
  • Significant place in high-tech industry – they are commonly used in computer drives, brushless drives, precision medical tools, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • At very 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.
  • Neodymium magnets decrease their force 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, taking into account:
  • on a block made of mild steel, effectively closing the magnetic flux
  • whose transverse dimension is min. 10 mm
  • with a surface perfectly flat
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Practical aspects of lifting capacity – factors

Holding efficiency is influenced by working environment parameters, including (from priority):
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Safety rules for work with neodymium magnets
Dust is flammable

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

Crushing force

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Magnetic media

Powerful magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Health Danger

People with a heart stimulator must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.

Allergic reactions

Some people have a hypersensitivity to nickel, which is the common plating for neodymium magnets. Extended handling might lead to a rash. We suggest use safety gloves.

This is not a toy

Only for adults. Small elements can be swallowed, leading to severe trauma. Store out of reach of children and animals.

Protective goggles

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Threat to navigation

Note: rare earth magnets generate a field that disrupts sensitive sensors. Keep a safe distance from your mobile, device, and GPS.

Caution required

Exercise caution. Rare earth magnets act from a distance and connect with massive power, often faster than you can move away.

Do not overheat magnets

Do not overheat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Important! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98