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MW 4x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010076

GTIN/EAN: 5906301810759

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

0.38 g

Magnetization Direction

↑ axial

Load capacity

0.51 kg / 4.96 N

Magnetic Induction

552.79 mT / 5528 Gs

Coating

[NiCuNi] Nickel

check parameters »

0.406 ZŁ with VAT / pcs + price for transport

0.330 ZŁ net + 23% VAT / pcs

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Technical details - MW 4x4 / N38 - cylindrical magnet

Specification / characteristics - MW 4x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010076
GTIN/EAN 5906301810759
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 4 mm [±0,1 mm]
Weight 0.38 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.51 kg / 4.96 N
Magnetic Induction ~ ? 552.79 mT / 5528 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x4 / 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

Engineering analysis of the magnet - data

These data represent the outcome of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MW 4x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5517 Gs
551.7 mT
 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
 weak grip
1 mm 2984 Gs
298.4 mT
 0.15 kg / 0.33 pounds
149.2 g / 1.5 N
 weak grip
2 mm 1498 Gs
149.8 mT
 0.04 kg / 0.08 pounds
37.6 g / 0.4 N
 weak grip
3 mm 803 Gs
80.3 mT
 0.01 kg / 0.02 pounds
10.8 g / 0.1 N
 weak grip
5 mm 296 Gs
29.6 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 weak grip
10 mm 58 Gs
5.8 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
15 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
20 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
30 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Pulling power weakens significantly per each millimeter of distance. Keep in mind that even a very thin break (e.g., dirt, paint, rust) noticeably weakens the grip. Magnets operate strongest during direct contact; air break kills the power. Observe how rapidly the parameters drop, when the magnet does not touch tightly to the metal substrate. When calculating the mounting, avoid unnecessary gaps.

Table 2: Slippage capacity (vertical surface)
MW 4x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.10 kg / 0.22 pounds
102.0 g / 1.0 N
1 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
2 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 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
This section indicates the approximate force necessary to cause the sliding of the magnet vertically on a vertical steel plate (considering typical friction coefficient). This value varies with the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 4x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.15 kg / 0.34 pounds
153.0 g / 1.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.10 kg / 0.22 pounds
102.0 g / 1.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.11 pounds
51.0 g / 0.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.26 kg / 0.56 pounds
255.0 g / 2.5 N
When hanging a holder on a upright surface (e.g., a fridge), it will maintain only approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip mean that products move down easier than they detach. Designing a wall mount? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the element will give way down under a noticeably lighter load. Utilizing a rubberized pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 4x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.05 kg / 0.11 pounds
51.0 g / 0.5 N
1 mm
25%
 0.13 kg / 0.28 pounds
127.5 g / 1.3 N
2 mm
50%
 0.26 kg / 0.56 pounds
255.0 g / 2.5 N
3 mm
75%
 0.38 kg / 0.84 pounds
382.5 g / 3.8 N
5 mm
100%
 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
10 mm
100%
 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
11 mm
100%
 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
12 mm
100%
 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
A too thin steel is unable to conduct the entire magnetic field, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's power, you require a sufficiently solid backing of metal. The material oversaturation means that on delicate walls (e.g., thin profiles), the magnet shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - power drop
MW 4x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
 OK
40 °C -2.2% 0.50 kg / 1.10 pounds
498.8 g / 4.9 N
 OK
60 °C -4.4% 0.49 kg / 1.07 pounds
487.6 g / 4.8 N
 OK
80 °C -6.6% 0.48 kg / 1.05 pounds
476.3 g / 4.7 N
100 °C -28.8% 0.36 kg / 0.80 pounds
363.1 g / 3.6 N
Ordinary NdFeB products change their properties power past the thermal threshold. Protect against heat – high temperature can irreversibly destroy this product. As the temperature rises, the magnet's capacity briefly lowers. Avoid using this magnet in hot environments higher than its working range. Too high temperature will cause irreversible degradation of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 4x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.36 kg / 5.20 pounds
5 984 Gs
0.35 kg / 0.78 pounds
354 g / 3.5 N
 N/A
1 mm 1.34 kg / 2.96 pounds
8 324 Gs
0.20 kg / 0.44 pounds
201 g / 2.0 N
 1.21 kg / 2.66 pounds
~0 Gs
2 mm 0.69 kg / 1.52 pounds
5 968 Gs
0.10 kg / 0.23 pounds
103 g / 1.0 N
 0.62 kg / 1.37 pounds
~0 Gs
3 mm 0.34 kg / 0.76 pounds
4 213 Gs
0.05 kg / 0.11 pounds
52 g / 0.5 N
 0.31 kg / 0.68 pounds
~0 Gs
5 mm 0.09 kg / 0.20 pounds
2 169 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
 0.08 kg / 0.18 pounds
~0 Gs
10 mm 0.01 kg / 0.01 pounds
592 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
116 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
10 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
6 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
4 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
3 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
2 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
1 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a wider radius than a magnet and steel combination. Such a system of magnet-to-magnet generates a stronger field and a wider radius of operation. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the collision energy is extreme. The repulsion force is marginally weaker than the connection force, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint between the magnets (due to field cancellation).
* Calculations apply to friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MW 4x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.0 cm
Timepiece 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
Powerful magnet radiation poses a large risk to electronic devices and pacemakers. These magnets generate a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 4x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 36.95 km/h
(10.26 m/s)
 0.02 J
30 mm 63.99 km/h
(17.78 m/s)
 0.06 J
50 mm 82.62 km/h
(22.95 m/s)
 0.10 J
100 mm 116.84 km/h
(32.45 m/s)
 0.20 J
Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Striking energy can cause material chips or injury to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Surface protection spec
MW 4x4 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MW 4x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 717 Mx 7.2 µWb
Pc Coefficient 0.89 High (Stable)
Total magnetic flux passing through the magnet pole. Key data when building generators and motors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
MW 4x4 / N38

Environment Effective steel pull Effect
Air (land) 0.51 kg Standard
Water (riverbed) 0.58 kg
(+0.07 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical wall, the magnet holds just ~20% of its max power.

2. Steel thickness impact

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.89

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.

Engineering data and GPSR
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: 010076-2026
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The presented product is a very strong cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø4x4 mm, guarantees optimal power. This specific item boasts high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.51 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 4.96 N with a weight of only 0.38 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø4x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø4x4 mm, which, at a weight of 0.38 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 0.51 kg (force ~4.96 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 4 mm. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages and disadvantages of rare earth magnets.

Strengths

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They retain magnetic properties for almost ten years – the drop is just ~1% (based on simulations),
  • They maintain their magnetic properties even under external field action,
  • By using a lustrous coating of nickel, the element gains an aesthetic look,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of custom machining and adjusting to individual requirements,
  • Fundamental importance in high-tech industry – they are commonly used in HDD drives, motor assemblies, precision medical tools, and modern systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of creating nuts in the magnet and complicated forms - preferred is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small elements of these magnets are able to complicate diagnosis 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 increases costs of application in large quantities

Lifting parameters

Highest magnetic holding force – what affects it?

Magnet power was defined for ideal contact conditions, assuming:
  • using a base made of mild steel, serving as a circuit closing element
  • whose thickness equals approx. 10 mm
  • with an ideally smooth touching surface
  • with total lack of distance (no coatings)
  • during pulling in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Key elements affecting lifting force

Holding efficiency is influenced by specific conditions, mainly (from priority):
  • Gap (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Base smoothness – 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. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
Nickel coating and allergies

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

Swallowing risk

Absolutely keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Permanent damage

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Hand protection

Mind your fingers. Two powerful magnets will snap together immediately with a force of massive weight, crushing everything in their path. Be careful!

Flammability

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Threat to electronics

Intense magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Stay away of min. 10 cm.

Precision electronics

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to avoid damaging the sensors.

Medical implants

For implant holders: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Safe operation

Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets leads to them breaking into small pieces.

Danger! Details about hazards in the article: Magnet Safety Guide.