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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

technical details »

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Not sure which magnet to buy?

Contact us by phone +48 22 499 98 98 otherwise send us a note using our online form our website.
Lifting power along with form of a neodymium magnet can be checked with our our magnetic calculator.

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Technical data of the product - 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

Technical simulation of the magnet - technical parameters

These data are the outcome of a physical simulation. Results rely on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Use these data as a preliminary roadmap when designing systems.

Table 1: Static 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 lbs
20710.0 g / 203.2 N
 dangerous!
1 mm 5241 Gs
524.1 mT
 18.01 kg / 39.71 lbs
18011.7 g / 176.7 N
 dangerous!
2 mm 4861 Gs
486.1 mT
 15.50 kg / 34.17 lbs
15498.1 g / 152.0 N
 dangerous!
3 mm 4490 Gs
449.0 mT
 13.22 kg / 29.15 lbs
13223.5 g / 129.7 N
 dangerous!
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
Magnetic force weakens sharply with every mm of gap. Remember that even a very thin break (e.g., dirt, paint, dust) significantly weakens the grip. Magnetic products hold strongest in perfect adhesion; gap kills the force. Notice how flashily the parameters plummet, when the magnet does not touch tightly to the metal substrate. When designing the assembly, avoid redundant distances.

Table 2: Slippage load (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 shows the approximate holding capacity required to start the downward movement of the magnet down along a vertical metal surface (considering typical friction). This parameter varies with the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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
When placing a holder on a upright surface (e.g., a car body), it will only hold only approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient mean that holders slip faster than they pop off the substrate. Planning a vertical fastening? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a much lighter cargo. Application of an anti-slip coating can significantly raise the stability.

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 cannot take in the full magnetic flux, which weakens actual performance of the holder. If you attach a powerful product to a thin surface, the field will penetrate right through and the pull force will drop sharply. To achieve the maximum of this magnet's potential, you need a suitably thick element of steel. The material oversaturation causes that on thin elements (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - 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 strength past the thermal threshold. Watch out for overheating – heat can irreversibly destroy this magnet. With every degree above norm, the magnet's power momentarily lowers. Avoid using this magnet close to heaters exceeding its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
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 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 steel setup. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Designing a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is extreme. The levitation is a bit weaker than the attraction, but still impressive.
*Field value between like poles is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Calculations demonstrate sliding force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - 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
Powerful magnet radiation poses a serious hazard to electronic devices as well as pacemakers. These NdFeB products generate a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation passes through tissues and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (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. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during installation so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Corrosion resistance
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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Flux value emitted by the magnet pole. Key data for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Shear force

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

2. Plate thickness effect

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

3. Heat tolerance

*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

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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
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: 030197-2026
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The ring-shaped magnet MP 30x6x10 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. 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. One turn too many can destroy the magnet, so do it slowly. 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 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. 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 key parameter here is the lifting capacity 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.

Pros as well as cons of neodymium magnets.

Strengths

Apart from their notable power, neodymium magnets have these key benefits:
  • Their strength is durable, and after around ten years it decreases only by ~1% (according to research),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the glossy finish, the layer of nickel, gold-plated, or silver gives an visually attractive appearance,
  • The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to modularity in shaping and the ability to modify to complex applications,
  • Versatile presence in innovative solutions – they are used in computer drives, electric motors, diagnostic systems, and other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease their power 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 stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these products can disrupt the diagnostic process medical after entering the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The load parameter shown concerns the limit force, recorded under ideal test conditions, namely:
  • using a plate made of high-permeability steel, serving as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with an polished contact surface
  • without the slightest air gap between the magnet and steel
  • under axial force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

It is worth knowing that the application force will differ influenced by elements below, starting with the most relevant:
  • Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate lowers the holding force.

Safe handling of NdFeB magnets
Danger to pacemakers

Warning for patients: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Operating temperature

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

Pinching danger

Large magnets can break fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Handling rules

Handle magnets consciously. Their huge power can shock even professionals. Be vigilant and respect their power.

Danger to the youngest

Product intended for adults. Small elements can be swallowed, leading to severe trauma. Store away from kids and pets.

Fragile material

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Magnetic interference

GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Electronic hazard

Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Fire warning

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?