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MP 10x6x4 / N38 - ring magnet

ring magnet

Catalog no 030179

GTIN/EAN: 5906301811961

5.00

Diameter

10 mm [±0,1 mm]

internal diameter Ø

6 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

1.51 g

Magnetization Direction

↑ axial

Load capacity

1.79 kg / 17.55 N

Magnetic Induction

386.91 mT / 3869 Gs

Coating

[NiCuNi] Nickel

0.898 with VAT / pcs + price for transport

0.730 ZŁ net + 23% VAT / pcs

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Technical details - MP 10x6x4 / N38 - ring magnet

Specification / characteristics - MP 10x6x4 / N38 - ring magnet

properties
properties values
Cat. no. 030179
GTIN/EAN 5906301811961
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 10 mm [±0,1 mm]
internal diameter Ø 6 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 1.51 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.79 kg / 17.55 N
Magnetic Induction ~ ? 386.91 mT / 3869 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 10x6x4 / 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 assembly - report

These values constitute the outcome of a mathematical analysis. Values are based on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Please consider these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MP 10x6x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6115 Gs
611.5 mT
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
safe
1 mm 4915 Gs
491.5 mT
1.16 kg / 2.55 pounds
1156.7 g / 11.3 N
safe
2 mm 3833 Gs
383.3 mT
0.70 kg / 1.55 pounds
703.2 g / 6.9 N
safe
3 mm 2949 Gs
294.9 mT
0.42 kg / 0.92 pounds
416.3 g / 4.1 N
safe
5 mm 1761 Gs
176.1 mT
0.15 kg / 0.33 pounds
148.5 g / 1.5 N
safe
10 mm 612 Gs
61.2 mT
0.02 kg / 0.04 pounds
17.9 g / 0.2 N
safe
15 mm 284 Gs
28.4 mT
0.00 kg / 0.01 pounds
3.9 g / 0.0 N
safe
20 mm 157 Gs
15.7 mT
0.00 kg / 0.00 pounds
1.2 g / 0.0 N
safe
30 mm 64 Gs
6.4 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
safe
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Slippage load (vertical surface)
MP 10x6x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.36 kg / 0.79 pounds
358.0 g / 3.5 N
1 mm Stal (~0.2) 0.23 kg / 0.51 pounds
232.0 g / 2.3 N
2 mm Stal (~0.2) 0.14 kg / 0.31 pounds
140.0 g / 1.4 N
3 mm Stal (~0.2) 0.08 kg / 0.19 pounds
84.0 g / 0.8 N
5 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MP 10x6x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.54 kg / 1.18 pounds
537.0 g / 5.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.36 kg / 0.79 pounds
358.0 g / 3.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.18 kg / 0.39 pounds
179.0 g / 1.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.90 kg / 1.97 pounds
895.0 g / 8.8 N

Table 4: Material efficiency (saturation) - power losses
MP 10x6x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.18 kg / 0.39 pounds
179.0 g / 1.8 N
1 mm
25%
0.45 kg / 0.99 pounds
447.5 g / 4.4 N
2 mm
50%
0.90 kg / 1.97 pounds
895.0 g / 8.8 N
3 mm
75%
1.34 kg / 2.96 pounds
1342.5 g / 13.2 N
5 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
10 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
11 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
12 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N

Table 5: Thermal resistance (material behavior) - resistance threshold
MP 10x6x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
OK
40 °C -2.2% 1.75 kg / 3.86 pounds
1750.6 g / 17.2 N
OK
60 °C -4.4% 1.71 kg / 3.77 pounds
1711.2 g / 16.8 N
OK
80 °C -6.6% 1.67 kg / 3.69 pounds
1671.9 g / 16.4 N
100 °C -28.8% 1.27 kg / 2.81 pounds
1274.5 g / 12.5 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 10x6x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.93 kg / 28.50 pounds
6 169 Gs
1.94 kg / 4.27 pounds
1939 g / 19.0 N
N/A
1 mm 10.50 kg / 23.16 pounds
11 025 Gs
1.58 kg / 3.47 pounds
1576 g / 15.5 N
9.45 kg / 20.84 pounds
~0 Gs
2 mm 8.35 kg / 18.41 pounds
9 831 Gs
1.25 kg / 2.76 pounds
1253 g / 12.3 N
7.52 kg / 16.57 pounds
~0 Gs
3 mm 6.55 kg / 14.43 pounds
8 703 Gs
0.98 kg / 2.17 pounds
982 g / 9.6 N
5.89 kg / 12.99 pounds
~0 Gs
5 mm 3.91 kg / 8.63 pounds
6 729 Gs
0.59 kg / 1.29 pounds
587 g / 5.8 N
3.52 kg / 7.76 pounds
~0 Gs
10 mm 1.07 kg / 2.36 pounds
3 522 Gs
0.16 kg / 0.35 pounds
161 g / 1.6 N
0.96 kg / 2.13 pounds
~0 Gs
20 mm 0.13 kg / 0.29 pounds
1 223 Gs
0.02 kg / 0.04 pounds
19 g / 0.2 N
0.12 kg / 0.26 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
194 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
129 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
91 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
66 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
50 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
39 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 10x6x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - collision effects
MP 10x6x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.94 km/h
(9.71 m/s)
0.07 J
30 mm 60.15 km/h
(16.71 m/s)
0.21 J
50 mm 77.64 km/h
(21.57 m/s)
0.35 J
100 mm 109.80 km/h
(30.50 m/s)
0.70 J

Table 9: Corrosion resistance
MP 10x6x4 / 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 (Flux)
MP 10x6x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 017 Mx 40.2 µWb
Pc Coefficient 1.44 High (Stable)

Table 11: Hydrostatics and buoyancy
MP 10x6x4 / N38

Environment Effective steel pull Effect
Air (land) 1.79 kg Standard
Water (riverbed) 2.05 kg
(+0.26 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 retains only approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.44

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
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: 030179-2026
Quick Unit Converter
Pulling force

Magnetic Field

Other products

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. 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.
It is a magnetic ring with a diameter of 10 mm and thickness 4 mm. The pulling force of this model is an impressive 1.79 kg, which translates to 17.55 N in newtons. 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. In the case of connecting two rings, make sure one is turned the right way. 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.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain full power for nearly 10 years – the drop is just ~1% (in theory),
  • Neodymium magnets are characterized by highly resistant to magnetic field loss caused by external interference,
  • A magnet with a shiny gold surface is more attractive,
  • Magnets exhibit exceptionally strong magnetic induction on the outer side,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Thanks to freedom in designing and the capacity to modify to client solutions,
  • Huge importance in high-tech industry – they serve a role in data components, motor assemblies, medical equipment, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose 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 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, in case of application outdoors
  • We recommend cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical after entering the body.
  • Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat affects it?

The specified lifting capacity refers to the maximum value, obtained under ideal test conditions, meaning:
  • using a base made of high-permeability steel, serving as a circuit closing element
  • with a thickness minimum 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • at room temperature

Lifting capacity in real conditions – factors

In practice, the actual holding force depends on several key aspects, listed from the most important:
  • Distance (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Thermal limits

Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and strength.

Nickel allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease working with magnets and wear gloves.

Electronic devices

Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Medical implants

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Machining danger

Machining of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Shattering risk

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

Precision electronics

Note: neodymium magnets produce a field that confuses precision electronics. Keep a safe distance from your mobile, tablet, and GPS.

Physical harm

Watch your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!

Powerful field

Handle with care. Neodymium magnets attract from a distance and snap with massive power, often faster than you can move away.

Adults only

Always store magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

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