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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 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 product - technical parameters

The following information constitute the outcome of a engineering calculation. Results rely on algorithms for the class Nd2Fe14B. Operational parameters may differ. Treat these data 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) Risk Status
0 mm 6115 Gs
611.5 mT
1.79 kg / 1790.0 g
17.6 N
low risk
1 mm 4915 Gs
491.5 mT
1.16 kg / 1156.7 g
11.3 N
low risk
2 mm 3833 Gs
383.3 mT
0.70 kg / 703.2 g
6.9 N
low risk
3 mm 2949 Gs
294.9 mT
0.42 kg / 416.3 g
4.1 N
low risk
5 mm 1761 Gs
176.1 mT
0.15 kg / 148.5 g
1.5 N
low risk
10 mm 612 Gs
61.2 mT
0.02 kg / 17.9 g
0.2 N
low risk
15 mm 284 Gs
28.4 mT
0.00 kg / 3.9 g
0.0 N
low risk
20 mm 157 Gs
15.7 mT
0.00 kg / 1.2 g
0.0 N
low risk
30 mm 64 Gs
6.4 mT
0.00 kg / 0.2 g
0.0 N
low risk
50 mm 19 Gs
1.9 mT
0.00 kg / 0.0 g
0.0 N
low risk

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

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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 10x6x4 / N38

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

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

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.18 kg / 179.0 g
1.8 N
1 mm
25%
0.45 kg / 447.5 g
4.4 N
2 mm
50%
0.90 kg / 895.0 g
8.8 N
5 mm
100%
1.79 kg / 1790.0 g
17.6 N
10 mm
100%
1.79 kg / 1790.0 g
17.6 N

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

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

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

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 12.93 kg / 12926 g
126.8 N
6 169 Gs
N/A
1 mm 10.50 kg / 10505 g
103.1 N
11 025 Gs
9.45 kg / 9454 g
92.7 N
~0 Gs
2 mm 8.35 kg / 8353 g
81.9 N
9 831 Gs
7.52 kg / 7518 g
73.7 N
~0 Gs
3 mm 6.55 kg / 6547 g
64.2 N
8 703 Gs
5.89 kg / 5892 g
57.8 N
~0 Gs
5 mm 3.91 kg / 3913 g
38.4 N
6 729 Gs
3.52 kg / 3522 g
34.5 N
~0 Gs
10 mm 1.07 kg / 1072 g
10.5 N
3 522 Gs
0.96 kg / 965 g
9.5 N
~0 Gs
20 mm 0.13 kg / 129 g
1.3 N
1 223 Gs
0.12 kg / 116 g
1.1 N
~0 Gs
50 mm 0.00 kg / 3 g
0.0 N
194 Gs
0.00 kg / 0 g
0.0 N
~0 Gs

Table 7: Safety (HSE) (electronics) - 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: 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: 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: Construction 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: 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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

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

2. Efficiency vs thickness

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

3. Thermal stability

*For standard magnets, the max working temp 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
Elemental analysis
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: 030179-2025
Measurement Calculator
Pulling force

Field Strength

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. This product with a force of 1.79 kg works great as a door latch, speaker holder, or mounting 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 caution. 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 flexible washer under the screw head, which will cushion the stresses. 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. 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 lifting capacity 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. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of neodymium magnets.

Advantages

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • Neodymium magnets remain extremely resistant to demagnetization caused by external field sources,
  • A magnet with a shiny nickel surface is more attractive,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in constructing and the ability to customize to client solutions,
  • Universal use in high-tech industry – they are used in HDD drives, motor assemblies, advanced medical instruments, and other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Cons of neodymium magnets: application proposals
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength 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 while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complicated shapes - preferred is cover - magnetic holder.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these products can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat affects it?

Breakaway force was defined for ideal contact conditions, including:
  • on a base made of mild steel, effectively closing the magnetic flux
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • with total lack of distance (no paint)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Real force is affected by working environment parameters, including (from most important):
  • Distance (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Angle of force application – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with neodymium magnets
Crushing force

Large magnets can break fingers in a fraction of a second. Do not put your hand between two strong magnets.

Protect data

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Metal Allergy

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Heat warning

Do not overheat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

GPS Danger

Remember: neodymium magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and GPS.

Mechanical processing

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Caution required

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

Eye protection

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them shattering into shards.

Pacemakers

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

Danger to the youngest

NdFeB magnets are not toys. Eating several magnets can lead to them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98