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MW 4x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010079

GTIN/EAN: 5906301810780

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

0.75 g

Magnetization Direction

↑ axial

Load capacity

0.35 kg / 3.48 N

Magnetic Induction

599.59 mT / 5996 Gs

Coating

[NiCuNi] Nickel

technical specifications »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Lifting power as well as form of a neodymium magnet can be tested using our modular calculator.

Same-day processing for orders placed before 14:00.

Product card - MW 4x8 / N38 - cylindrical magnet

Specification / characteristics - MW 4x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010079
GTIN/EAN 5906301810780
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 8 mm [±0,1 mm]
Weight 0.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.35 kg / 3.48 N
Magnetic Induction ~ ? 599.59 mT / 5996 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x8 / 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 modeling of the product - report

These data constitute the result of a mathematical simulation. Values were calculated on models for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - power drop
MW 4x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5984 Gs
598.4 mT
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
 weak grip
1 mm 3280 Gs
328.0 mT
 0.11 kg / 0.23 lbs
105.1 g / 1.0 N
 weak grip
2 mm 1696 Gs
169.6 mT
 0.03 kg / 0.06 lbs
28.1 g / 0.3 N
 weak grip
3 mm 941 Gs
94.1 mT
 0.01 kg / 0.02 lbs
8.7 g / 0.1 N
 weak grip
5 mm 371 Gs
37.1 mT
 0.00 kg / 0.00 lbs
1.3 g / 0.0 N
 weak grip
10 mm 82 Gs
8.2 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
15 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Magnetic force decreases drastically with every mm of gap. Remember that even a microscopic distance (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Magnets operate most effectively in perfect adhesion; air break kills the power. See how quickly the load capacity plummet, when the magnet does not adhere flatly to the metal substrate. When calculating the arrangement, eliminate additional spacers.

Table 2: Vertical capacity (wall)
MW 4x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.07 kg / 0.15 lbs
70.0 g / 0.7 N
1 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
2 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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
The table below defines the theoretical holding capacity sufficient to cause the downward movement of the magnet vertically against a vertical metal surface (assuming typical friction). The holding force is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 4x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.11 kg / 0.23 lbs
105.0 g / 1.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.15 lbs
70.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.08 lbs
35.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.18 kg / 0.39 lbs
175.0 g / 1.7 N
When placing a magnet on a upright plane (e.g., a board), it will only hold just about 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that magnets move down faster than they detach. Want to create a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a noticeably lighter cargo. Using a rubber layer can significantly improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MW 4x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.03 kg / 0.08 lbs
35.0 g / 0.3 N
1 mm
25%
 0.09 kg / 0.19 lbs
87.5 g / 0.9 N
2 mm
50%
 0.18 kg / 0.39 lbs
175.0 g / 1.7 N
3 mm
75%
 0.26 kg / 0.58 lbs
262.5 g / 2.6 N
5 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
10 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
11 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
12 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
A thin metal plate cannot absorb the full magnetic flux, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the field will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's power, you need a suitably thick backing of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the product holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal stability (stability) - power drop
MW 4x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
 OK
40 °C -2.2% 0.34 kg / 0.75 lbs
342.3 g / 3.4 N
 OK
60 °C -4.4% 0.33 kg / 0.74 lbs
334.6 g / 3.3 N
 OK
80 °C -6.6% 0.33 kg / 0.72 lbs
326.9 g / 3.2 N
100 °C -28.8% 0.25 kg / 0.55 lbs
249.2 g / 2.4 N
Ordinary NdFeB products lose power after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly damage this product. With increasing heat, the magnet's power temporarily lowers. Refrain from using this magnet close to heaters exceeding its safe range. Ignoring the limit will cause permanent loss of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 4x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.77 kg / 6.12 lbs
6 121 Gs
0.42 kg / 0.92 lbs
416 g / 4.1 N
 N/A
1 mm 1.59 kg / 3.51 lbs
9 063 Gs
0.24 kg / 0.53 lbs
239 g / 2.3 N
 1.43 kg / 3.16 lbs
~0 Gs
2 mm 0.83 kg / 1.84 lbs
6 559 Gs
0.12 kg / 0.28 lbs
125 g / 1.2 N
 0.75 kg / 1.65 lbs
~0 Gs
3 mm 0.43 kg / 0.94 lbs
4 694 Gs
0.06 kg / 0.14 lbs
64 g / 0.6 N
 0.38 kg / 0.85 lbs
~0 Gs
5 mm 0.12 kg / 0.27 lbs
2 498 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.24 lbs
~0 Gs
10 mm 0.01 kg / 0.02 lbs
743 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
20 mm 0.00 kg / 0.00 lbs
165 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
17 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
10 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
7 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
5 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
3 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
3 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a much further distance than a magnet and steel setup. Such a system of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is huge. The levitation is slightly lower than the connection force, but still significant.
*The magnetic induction for N-N configuration drops to ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Calculations refer to shear force of a pair of identical magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
MW 4x8 / 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
Timepiece 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 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
A strong magnetic field poses a real danger to IT equipment as well as pacemakers. These neodymiums produce a flux that prevents correct functioning of digital equipment. Notice: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MW 4x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.79 km/h
(6.05 m/s)
 0.01 J
30 mm 37.74 km/h
(10.48 m/s)
 0.04 J
50 mm 48.72 km/h
(13.53 m/s)
 0.07 J
100 mm 68.89 km/h
(19.14 m/s)
 0.14 J
Neodymium magnets are prone to chipping – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

Table 9: Coating parameters (durability)
MW 4x8 / 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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 4x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 836 Mx 8.4 µWb
Pc Coefficient 1.21 High (Stable)
Total magnetic flux emitted by the pole surface. Key data when building generators as well as sensors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MW 4x8 / N38

Environment Effective steel pull Effect
Air (land) 0.35 kg Standard
Water (riverbed) 0.40 kg
(+0.05 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds just a fraction of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Power loss vs temp

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.21

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
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%
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: 010079-2026
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The offered product is an incredibly powerful rod magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø4x8 mm, guarantees the highest energy density. The MW 4x8 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.35 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 3.48 N with a weight of only 0.75 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in industry, 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 suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø4x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø4x8 mm, which, at a weight of 0.75 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 0.35 kg (force ~3.48 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard 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.

Strengths as well as weaknesses of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets are extremely resistant to loss of magnetic properties caused by external magnetic fields,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • 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...
  • Possibility of custom forming as well as optimizing to specific needs,
  • Versatile presence in electronics industry – they find application in mass storage devices, drive modules, medical equipment, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • 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
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Best holding force of the magnet in ideal parameters – what contributes to it?

Breakaway force was defined for optimal configuration, taking into account:
  • with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a plane perfectly flat
  • without any air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature

Practical aspects of lifting capacity – factors

It is worth knowing that the working load will differ subject to elements below, starting with the most relevant:
  • Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel does not close the flux, causing part of the flux to be wasted into the air.
  • Plate material – mild steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens 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 attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the load capacity.

Safe handling of neodymium magnets
Cards and drives

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Permanent damage

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Beware of splinters

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Threat to navigation

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Adults only

Adult use only. Tiny parts pose a choking risk, leading to severe trauma. Keep away from children and animals.

Medical interference

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Sensitization to coating

A percentage of the population suffer from a sensitization to Ni, which is the common plating for neodymium magnets. Frequent touching might lead to a rash. We suggest use safety gloves.

Machining danger

Machining of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Bodily injuries

Large magnets can crush fingers in a fraction of a second. Never place your hand between two strong magnets.

Do not underestimate power

Be careful. Neodymium magnets act from a long distance and snap with huge force, often quicker than you can react.

Warning! Details about risks in the article: Safety of working with magnets.