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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 parameters of the product - 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 - technical parameters

Presented information represent the direct effect of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Use 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 lbs
1790.0 g / 17.6 N
weak grip
1 mm 4915 Gs
491.5 mT
1.16 kg / 2.55 lbs
1156.7 g / 11.3 N
weak grip
2 mm 3833 Gs
383.3 mT
0.70 kg / 1.55 lbs
703.2 g / 6.9 N
weak grip
3 mm 2949 Gs
294.9 mT
0.42 kg / 0.92 lbs
416.3 g / 4.1 N
weak grip
5 mm 1761 Gs
176.1 mT
0.15 kg / 0.33 lbs
148.5 g / 1.5 N
weak grip
10 mm 612 Gs
61.2 mT
0.02 kg / 0.04 lbs
17.9 g / 0.2 N
weak grip
15 mm 284 Gs
28.4 mT
0.00 kg / 0.01 lbs
3.9 g / 0.0 N
weak grip
20 mm 157 Gs
15.7 mT
0.00 kg / 0.00 lbs
1.2 g / 0.0 N
weak grip
30 mm 64 Gs
6.4 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
weak grip
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip

Table 2: Sliding force (wall)
MP 10x6x4 / N38

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

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 lbs
537.0 g / 5.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.36 kg / 0.79 lbs
358.0 g / 3.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.18 kg / 0.39 lbs
179.0 g / 1.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.90 kg / 1.97 lbs
895.0 g / 8.8 N

Table 4: Material efficiency (saturation) - sheet metal selection
MP 10x6x4 / N38

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

Table 5: Thermal stability (material behavior) - thermal limit
MP 10x6x4 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 10x6x4 / N38

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

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*For N38 material, 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

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%
Sustainability
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 Induction

Other products

The ring-shaped magnet MP 10x6x4 / 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. This product with a force of 1.79 kg works great as a cabinet closure, speaker holder, or spacer 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. The flat screw head should evenly press the magnet. 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. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building 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. 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. Always check that the screw head is not larger than the outer diameter of the magnet (10 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø10x4 mm and a weight of 1.51 g. The key parameter here is the holding force amounting to approximately 1.79 kg (force ~17.55 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. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of rare earth magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (in testing),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a shiny gold surface has better aesthetics,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • 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...
  • Possibility of accurate modeling as well as modifying to concrete conditions,
  • Key role in high-tech industry – they are used in data components, drive modules, advanced medical instruments, also complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in realizing nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat it depends on?

The lifting capacity listed is a theoretical maximum value conducted under standard conditions:
  • using a plate made of low-carbon steel, acting as a ideal flux conductor
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • characterized by smoothness
  • with total lack of distance (no paint)
  • under perpendicular force direction (90-degree angle)
  • at ambient temperature room level

What influences lifting capacity in practice

Bear in mind that the magnet holding will differ subject to elements below, starting with the most relevant:
  • Distance – the presence of any layer (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Steel type – low-carbon steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
  • Surface finish – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the holding force.

Safe handling of neodymium magnets
Keep away from electronics

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Do not overheat magnets

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them cracking into shards.

Immense force

Use magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and respect their force.

Swallowing risk

These products are not suitable for play. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.

Bodily injuries

Big blocks can smash fingers instantly. Under no circumstances place your hand between two attracting surfaces.

Fire risk

Powder produced during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Nickel coating and allergies

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.

Danger to pacemakers

Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.

Data carriers

Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Security! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98