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MW 4x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010075

GTIN/EAN: 5906301810742

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

0.94 g

Magnetization Direction

↑ axial

Load capacity

0.32 kg / 3.16 N

Magnetic Induction

606.05 mT / 6061 Gs

Coating

[NiCuNi] Nickel

0.800 with VAT / pcs + price for transport

0.650 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 4x10 / N38 - cylindrical magnet

Specification / characteristics - MW 4x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010075
GTIN/EAN 5906301810742
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 Ø 4 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 0.94 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.32 kg / 3.16 N
Magnetic Induction ~ ? 606.05 mT / 6061 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x10 / N38 - cylindrical 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 simulation of the assembly - report

The following values represent the outcome of a physical calculation. Results are based on models for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - interaction chart
MW 4x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6049 Gs
604.9 mT
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
safe
1 mm 3327 Gs
332.7 mT
0.10 kg / 0.21 pounds
96.8 g / 0.9 N
safe
2 mm 1732 Gs
173.2 mT
0.03 kg / 0.06 pounds
26.2 g / 0.3 N
safe
3 mm 969 Gs
96.9 mT
0.01 kg / 0.02 pounds
8.2 g / 0.1 N
safe
5 mm 389 Gs
38.9 mT
0.00 kg / 0.00 pounds
1.3 g / 0.0 N
safe
10 mm 90 Gs
9.0 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
safe
15 mm 35 Gs
3.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
20 mm 17 Gs
1.7 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
30 mm 6 Gs
0.6 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Sliding capacity (wall)
MW 4x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.06 kg / 0.14 pounds
64.0 g / 0.6 N
1 mm Stal (~0.2) 0.02 kg / 0.04 pounds
20.0 g / 0.2 N
2 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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 (sliding) - behavior on slippery surfaces
MW 4x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.10 kg / 0.21 pounds
96.0 g / 0.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.06 kg / 0.14 pounds
64.0 g / 0.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.07 pounds
32.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.16 kg / 0.35 pounds
160.0 g / 1.6 N

Table 4: Steel thickness (saturation) - power losses
MW 4x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.03 kg / 0.07 pounds
32.0 g / 0.3 N
1 mm
25%
0.08 kg / 0.18 pounds
80.0 g / 0.8 N
2 mm
50%
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
3 mm
75%
0.24 kg / 0.53 pounds
240.0 g / 2.4 N
5 mm
100%
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
10 mm
100%
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
11 mm
100%
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
12 mm
100%
0.32 kg / 0.71 pounds
320.0 g / 3.1 N

Table 5: Working in heat (material behavior) - resistance threshold
MW 4x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
OK
40 °C -2.2% 0.31 kg / 0.69 pounds
313.0 g / 3.1 N
OK
60 °C -4.4% 0.31 kg / 0.67 pounds
305.9 g / 3.0 N
OK
80 °C -6.6% 0.30 kg / 0.66 pounds
298.9 g / 2.9 N
100 °C -28.8% 0.23 kg / 0.50 pounds
227.8 g / 2.2 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 4x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.83 kg / 6.25 pounds
6 138 Gs
0.43 kg / 0.94 pounds
425 g / 4.2 N
N/A
1 mm 1.63 kg / 3.59 pounds
9 174 Gs
0.24 kg / 0.54 pounds
244 g / 2.4 N
1.47 kg / 3.23 pounds
~0 Gs
2 mm 0.86 kg / 1.89 pounds
6 655 Gs
0.13 kg / 0.28 pounds
129 g / 1.3 N
0.77 kg / 1.70 pounds
~0 Gs
3 mm 0.44 kg / 0.97 pounds
4 777 Gs
0.07 kg / 0.15 pounds
66 g / 0.7 N
0.40 kg / 0.88 pounds
~0 Gs
5 mm 0.13 kg / 0.28 pounds
2 561 Gs
0.02 kg / 0.04 pounds
19 g / 0.2 N
0.11 kg / 0.25 pounds
~0 Gs
10 mm 0.01 kg / 0.03 pounds
778 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.02 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
179 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
19 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
12 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
8 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
6 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
4 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
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MW 4x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Car key 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Dynamics (cracking risk) - collision effects
MW 4x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.61 km/h
(5.17 m/s)
0.01 J
30 mm 32.23 km/h
(8.95 m/s)
0.04 J
50 mm 41.61 km/h
(11.56 m/s)
0.06 J
100 mm 58.84 km/h
(16.35 m/s)
0.13 J

Table 9: Surface protection spec
MW 4x10 / 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)
MW 4x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 864 Mx 8.6 µWb
Pc Coefficient 1.31 High (Stable)

Table 11: Physics of underwater searching
MW 4x10 / N38

Environment Effective steel pull Effect
Air (land) 0.32 kg Standard
Water (riverbed) 0.37 kg
(+0.05 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

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

2. Efficiency vs thickness

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

3. Thermal stability

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.31

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 and environmental data
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%
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: 010075-2026
Measurement Calculator
Pulling force

Magnetic Field

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The offered product is an incredibly powerful cylindrical magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø4x10 mm, guarantees optimal power. This specific item is characterized by a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.32 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 3.16 N with a weight of only 0.94 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 4.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need the strongest magnets in the same volume (Ø4x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø4x10 mm, which, at a weight of 0.94 g, makes it an element with high magnetic energy density. The value of 3.16 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.94 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They are resistant to demagnetization induced by external field influence,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • 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...
  • In view of the ability of precise shaping and customization to custom solutions, magnetic components can be modeled in a wide range of geometric configurations, which increases their versatility,
  • Wide application in modern industrial fields – they are utilized in mass storage devices, electric drive systems, precision medical tools, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in small systems

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Maximum lifting capacity of the magnetwhat affects it?

Holding force of 0.32 kg is a theoretical maximum value executed under standard conditions:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • with an ground touching surface
  • with zero gap (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity results from many variables, listed from crucial:
  • Clearance – the presence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the holding force.

Warnings
Nickel allergy

A percentage of the population have a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Frequent touching may cause an allergic reaction. We strongly advise use safety gloves.

Operating temperature

Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Bodily injuries

Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.

Fire warning

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Material brittleness

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets leads to them shattering into shards.

Danger to the youngest

These products are not suitable for play. Eating multiple magnets can lead to them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.

Protect data

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

Phone sensors

Be aware: neodymium magnets generate a field that interferes with precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

Health Danger

Warning for patients: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Handling guide

Use magnets consciously. Their huge power can surprise even professionals. Plan your moves and respect their force.

Safety First! Learn more about risks in the article: Safety of working with magnets.