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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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Physical properties - 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

Engineering analysis of the assembly - technical parameters

The following values constitute the result of a engineering simulation. Values are based on models for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs distance) - interaction chart
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 pounds
20710.0 g / 203.2 N
critical level
1 mm 5241 Gs
524.1 mT
18.01 kg / 39.71 pounds
18011.7 g / 176.7 N
critical level
2 mm 4861 Gs
486.1 mT
15.50 kg / 34.17 pounds
15498.1 g / 152.0 N
critical level
3 mm 4490 Gs
449.0 mT
13.22 kg / 29.15 pounds
13223.5 g / 129.7 N
critical level
5 mm 3792 Gs
379.2 mT
9.43 kg / 20.79 pounds
9429.0 g / 92.5 N
warning
10 mm 2404 Gs
240.4 mT
3.79 kg / 8.36 pounds
3791.3 g / 37.2 N
warning
15 mm 1526 Gs
152.6 mT
1.53 kg / 3.37 pounds
1527.0 g / 15.0 N
low risk
20 mm 1000 Gs
100.0 mT
0.66 kg / 1.45 pounds
655.5 g / 6.4 N
low risk
30 mm 482 Gs
48.2 mT
0.15 kg / 0.34 pounds
152.6 g / 1.5 N
low risk
50 mm 161 Gs
16.1 mT
0.02 kg / 0.04 pounds
17.0 g / 0.2 N
low risk

Table 2: Sliding 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 pounds
4142.0 g / 40.6 N
1 mm Stal (~0.2) 3.60 kg / 7.94 pounds
3602.0 g / 35.3 N
2 mm Stal (~0.2) 3.10 kg / 6.83 pounds
3100.0 g / 30.4 N
3 mm Stal (~0.2) 2.64 kg / 5.83 pounds
2644.0 g / 25.9 N
5 mm Stal (~0.2) 1.89 kg / 4.16 pounds
1886.0 g / 18.5 N
10 mm Stal (~0.2) 0.76 kg / 1.67 pounds
758.0 g / 7.4 N
15 mm Stal (~0.2) 0.31 kg / 0.67 pounds
306.0 g / 3.0 N
20 mm Stal (~0.2) 0.13 kg / 0.29 pounds
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N

Table 3: Wall mounting (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 pounds
6213.0 g / 60.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.14 kg / 9.13 pounds
4142.0 g / 40.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.07 kg / 4.57 pounds
2071.0 g / 20.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.36 kg / 22.83 pounds
10355.0 g / 101.6 N

Table 4: Steel thickness (saturation) - 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 pounds
1035.5 g / 10.2 N
1 mm
13%
2.59 kg / 5.71 pounds
2588.8 g / 25.4 N
2 mm
25%
5.18 kg / 11.41 pounds
5177.5 g / 50.8 N
3 mm
38%
7.77 kg / 17.12 pounds
7766.3 g / 76.2 N
5 mm
63%
12.94 kg / 28.54 pounds
12943.8 g / 127.0 N
10 mm
100%
20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
11 mm
100%
20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
12 mm
100%
20.71 kg / 45.66 pounds
20710.0 g / 203.2 N

Table 5: Thermal resistance (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 pounds
20710.0 g / 203.2 N
OK
40 °C -2.2% 20.25 kg / 44.65 pounds
20254.4 g / 198.7 N
OK
60 °C -4.4% 19.80 kg / 43.65 pounds
19798.8 g / 194.2 N
OK
80 °C -6.6% 19.34 kg / 42.64 pounds
19343.1 g / 189.8 N
100 °C -28.8% 14.75 kg / 32.51 pounds
14745.5 g / 144.7 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 30x6x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 103.97 kg / 229.22 pounds
6 035 Gs
15.60 kg / 34.38 pounds
15596 g / 153.0 N
N/A
1 mm 97.15 kg / 214.17 pounds
10 864 Gs
14.57 kg / 32.13 pounds
14572 g / 143.0 N
87.43 kg / 192.75 pounds
~0 Gs
2 mm 90.42 kg / 199.35 pounds
10 481 Gs
13.56 kg / 29.90 pounds
13564 g / 133.1 N
81.38 kg / 179.42 pounds
~0 Gs
3 mm 83.97 kg / 185.13 pounds
10 100 Gs
12.60 kg / 27.77 pounds
12596 g / 123.6 N
75.57 kg / 166.61 pounds
~0 Gs
5 mm 71.94 kg / 158.60 pounds
9 349 Gs
10.79 kg / 23.79 pounds
10791 g / 105.9 N
64.75 kg / 142.74 pounds
~0 Gs
10 mm 47.34 kg / 104.36 pounds
7 583 Gs
7.10 kg / 15.65 pounds
7100 g / 69.7 N
42.60 kg / 93.92 pounds
~0 Gs
20 mm 19.03 kg / 41.96 pounds
4 809 Gs
2.86 kg / 6.29 pounds
2855 g / 28.0 N
17.13 kg / 37.77 pounds
~0 Gs
50 mm 1.53 kg / 3.37 pounds
1 363 Gs
0.23 kg / 0.51 pounds
229 g / 2.2 N
1.38 kg / 3.03 pounds
~0 Gs
60 mm 0.77 kg / 1.69 pounds
965 Gs
0.11 kg / 0.25 pounds
115 g / 1.1 N
0.69 kg / 1.52 pounds
~0 Gs
70 mm 0.41 kg / 0.90 pounds
706 Gs
0.06 kg / 0.14 pounds
61 g / 0.6 N
0.37 kg / 0.81 pounds
~0 Gs
80 mm 0.23 kg / 0.51 pounds
531 Gs
0.03 kg / 0.08 pounds
35 g / 0.3 N
0.21 kg / 0.46 pounds
~0 Gs
90 mm 0.14 kg / 0.30 pounds
409 Gs
0.02 kg / 0.05 pounds
21 g / 0.2 N
0.12 kg / 0.27 pounds
~0 Gs
100 mm 0.09 kg / 0.19 pounds
322 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.17 pounds
~0 Gs

Table 7: Safety (HSE) (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
Timepiece 20 Gs (2.0 mT) 12.0 cm
Mobile device 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

Table 8: Impact energy (cracking risk) - warning
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: Electrical data (Pc)
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Temperature resistance

*For standard magnets, 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.

Technical specification and ecology
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 Field

Other deals

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. 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 30x6x10 / 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. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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 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 key parameter here is the holding force amounting to approximately 20.71 kg (force ~203.16 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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). 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 neodymium magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after nearly 10 years – the reduction in strength is only ~1% (according to tests),
  • They have excellent resistance to magnetic field loss due to external magnetic sources,
  • In other words, due to the smooth finish of nickel, the element is aesthetically pleasing,
  • Magnetic induction on the working layer of the magnet turns out to be exceptional,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of precise machining as well as modifying to defined needs,
  • Fundamental importance in modern industrial fields – they find application in mass storage devices, drive modules, advanced medical instruments, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making nuts in the magnet and complicated forms - recommended is a housing - magnet mounting.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price is relatively high,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat affects it?

The load parameter shown refers to the peak performance, recorded under optimal environment, specifically:
  • on a base made of mild steel, optimally conducting the magnetic field
  • whose thickness equals approx. 10 mm
  • with an polished touching surface
  • with total lack of distance (no coatings)
  • during detachment in a direction perpendicular to the plane
  • at room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by specific conditions, mainly (from priority):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
This is not a toy

Adult use only. Tiny parts pose a choking risk, causing severe trauma. Keep out of reach of kids and pets.

Conscious usage

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Electronic devices

Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Eye protection

Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Combustion hazard

Machining of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Keep away from electronics

Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

ICD Warning

Warning for patients: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to handle the magnets.

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will destroy its properties and strength.

Allergy Warning

Some people experience a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in dermatitis. It is best to use safety gloves.

Hand protection

Large magnets can smash fingers in a fraction of a second. Do not place your hand between two strong magnets.

Safety First! Want to know more? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98