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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 - 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

Physical simulation of the magnet - data

These values represent the direct effect of a engineering calculation. Results rely on models for the class Nd2Fe14B. Actual performance may differ. Treat these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - 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 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: Shear load (wall)
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: Vertical assembly (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 (substrate influence) - 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 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 stability (stability) - power drop
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: Two magnets (attraction) - field collision
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 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: Protective zones (implants) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Mobile device 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 (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: Anti-corrosion coating 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: 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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Caution: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely weakens 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%
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
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Magnet pull force

Magnetic Field

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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 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. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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 can be damaged 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø10 mm (outer diameter) and height 4 mm. 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. 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.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for around ten years – the loss is just ~1% (based on simulations),
  • Magnets very well resist against loss of magnetization caused by foreign field sources,
  • In other words, due to the aesthetic surface of silver, the element gains a professional look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • In view of the possibility of free molding and customization to specialized projects, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
  • Versatile presence in innovative solutions – they find application in hard drives, brushless drives, diagnostic systems, also multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. 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 advise 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 stable to moisture, in case of application outdoors
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these products can complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting capacity of the magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, assuming:
  • on a block made of structural steel, optimally conducting the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • characterized by even structure
  • with direct contact (without paint)
  • during detachment in a direction vertical to the mounting surface
  • in neutral thermal conditions

What influences lifting capacity in practice

Bear in mind that the working load will differ influenced by elements below, in order of importance:
  • Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is reached only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Do not drill into magnets

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Physical harm

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Skin irritation risks

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop handling magnets and use protective gear.

Impact on smartphones

An intense magnetic field negatively affects the operation of magnetometers in phones and GPS navigation. Keep magnets near a device to prevent breaking the sensors.

Magnet fragility

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Permanent damage

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

Warning for heart patients

For implant holders: Strong magnetic fields disrupt electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Immense force

Use magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their force.

Choking Hazard

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.

Keep away from computers

Do not bring magnets near a purse, computer, or TV. The magnetic field can destroy these devices and wipe information from cards.

Caution! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98