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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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Detailed specification - 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

Engineering modeling of the product - report

The following information represent the result of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - characteristics
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
safe
1 mm 4915 Gs
491.5 mT
1.16 kg / 2.55 lbs
1156.7 g / 11.3 N
safe
2 mm 3833 Gs
383.3 mT
0.70 kg / 1.55 lbs
703.2 g / 6.9 N
safe
3 mm 2949 Gs
294.9 mT
0.42 kg / 0.92 lbs
416.3 g / 4.1 N
safe
5 mm 1761 Gs
176.1 mT
0.15 kg / 0.33 lbs
148.5 g / 1.5 N
safe
10 mm 612 Gs
61.2 mT
0.02 kg / 0.04 lbs
17.9 g / 0.2 N
safe
15 mm 284 Gs
28.4 mT
0.00 kg / 0.01 lbs
3.9 g / 0.0 N
safe
20 mm 157 Gs
15.7 mT
0.00 kg / 0.00 lbs
1.2 g / 0.0 N
safe
30 mm 64 Gs
6.4 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
safe
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Slippage hold (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 (sliding) - 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 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 (stability) - 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 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: Two magnets (attraction) - field collision
MP 10x6x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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: Hazards (implants) - 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: 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 (Pc)
MP 10x6x4 / N38

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

Table 11: Physics of underwater searching
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens 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.

Technical specification and ecology
Material specification
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%
Environmental data
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
Magnet Unit Converter
Magnet pull force

Magnetic Induction

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The ring magnet with a hole MP 10x6x4 / N38 is created for permanent mounting, where glue might fail or be insufficient. 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. 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 does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and easily scratched 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. 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 (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 pulling force of this model is an impressive 1.79 kg, which translates to 17.55 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). 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 Nd2Fe14B magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They retain their magnetic properties even under close interference source,
  • By using a lustrous layer of silver, the element presents an proper look,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of individual modeling as well as adapting to precise conditions,
  • Huge importance in advanced technology sectors – they serve a role in HDD drives, electromotive mechanisms, diagnostic systems, as well as industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of making nuts in the magnet and complex forms - preferred is casing - magnet mounting.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum lifting force for a neodymium magnet – what it depends on?

Holding force of 1.79 kg is a theoretical maximum value performed under the following configuration:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with a plane free of scratches
  • under conditions of no distance (surface-to-surface)
  • under vertical application of breakaway force (90-degree angle)
  • in stable room temperature

Key elements affecting lifting force

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:
  • Distance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease working with magnets and use protective gear.

Do not drill into magnets

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Physical harm

Big blocks can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Do not overheat magnets

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

Risk of cracking

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Respect the power

Handle magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and respect their power.

ICD Warning

People with a heart stimulator have to keep an large gap from magnets. The magnetic field can disrupt the operation of the life-saving device.

Threat to navigation

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

Electronic hazard

Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Keep away from children

Absolutely store magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.

Attention! Learn more about risks in the article: Magnet Safety Guide.