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MW 4x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010079

GTIN/EAN: 5906301810780

5.00
Load capacity 0.35 kg / 3.48 N Magnetic Induction 599.59 mT / 5996 Gs
Diameter Ø
4 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
0.75 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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0.701 zł with VAT / pcs + price for transport

0.570 zł net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical data - 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

Physical simulation of the assembly - data

These information are the result of a engineering analysis. Values rely on algorithms for the material Nd2Fe14B. Operational parameters may differ. Use these data as a reference point when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
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 weakens significantly with every mm of spacing. Note that even the smallest gap (e.g., dirt, varnish, dust) noticeably diminishes the holding power. Neodymiums operate optimally at the point of direct contact; air break kills the force. Observe how rapidly the parameters fall, when the magnet does not adhere flatly to the metal substrate. When designing the mounting, eliminate additional spacers.

Table 2: Slippage force (vertical surface)
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 following data presents the estimated shear load needed to cause the slippage of the magnet downwards along a upright steel wall (assuming standard friction coefficient). The holding force is a function of the separation distance between the magnet and the metal.

Table 3: Wall mounting (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 holder on a vertical wall (e.g., a fridge), it will only hold only about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient mean that magnets slide down easier than they pull off. Designing a vertical fastening? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slip down under a significantly smaller cargo. Using a rubber pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 sheet cannot absorb the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve the maximum of this magnet's potential, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
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
Classic neodymiums lose strength above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this product. As the temperature rises, the neodymium's capacity briefly lowers. Refrain from using this magnet close to ovens higher than its operating temperature limit. Ignoring the limit will result in destruction of magnetism.
*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field range
MW 4x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 magnetic products attract each other from a wider radius than a magnet and steel setup. The connection of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The repulsion force is marginally weaker than the connection force, but still large.
*Flux density for N-N configuration is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Calculations show friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
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
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
A strong magnetic field is a serious hazard to electronic devices and pacemakers. These magnets produce a field that disrupts operation of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MW 4x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 9.99 km/h
(2.77 m/s)
 0.00 J
30 mm 9.99 km/h
(2.77 m/s)
 0.00 J
50 mm 9.99 km/h
(2.77 m/s)
 0.00 J
100 mm 9.99 km/h
(2.78 m/s)
 0.00 J
Neodymium magnets are prone to chipping – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can cause material chips or painful pinches to skin. Be sure to control the product during installation so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

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 magnet pole. Key data for generator designers as well as sensors. The Pc coefficient defines 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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Wall mount (shear)

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

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Thermal stability

*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

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

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: 010079-2026
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The presented product is an extremely powerful cylindrical magnet, made from durable NdFeB material, which, with dimensions of Ø4x8 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 0.35 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard 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 positioning or actuating element. Thanks to the high power of 3.48 N with a weight of only 0.75 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 4.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in automation and machine building, where excessive 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 store.
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 holding force amounting to approximately 0.35 kg (force ~3.48 N), which, with such defined dimensions, proves the high grade of the NdFeB material. 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 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 through the diameter if your project requires it.

Pros and cons of neodymium magnets.

Benefits

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They retain magnetic properties for nearly ten years – the drop is just ~1% (according to analyses),
  • They do not lose their magnetic properties even under strong external field,
  • In other words, due to the metallic surface of silver, the element gains a professional look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of exact forming and adjusting to defined needs,
  • Wide application in advanced technology sectors – they are commonly used in magnetic memories, brushless drives, medical devices, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets lose their force 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
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated forms in magnets, we recommend using casing - magnetic mount.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

Magnet power is the result of a measurement for ideal contact conditions, taking into account:
  • using a sheet made of low-carbon steel, functioning as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • with a plane free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • at room temperature

Magnet lifting force in use – key factors

In practice, the real power results from many variables, presented from crucial:
  • Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

H&S for magnets
Hand protection

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

Operating temperature

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

Magnetic interference

Remember: neodymium magnets generate a field that disrupts precision electronics. Maintain a separation from your mobile, device, and GPS.

Do not give to children

Absolutely store magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Do not underestimate power

Exercise caution. Neodymium magnets act from a long distance and connect with huge force, often faster than you can move away.

Allergic reactions

Studies show that nickel (the usual finish) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands or choose versions in plastic housing.

Threat to electronics

Intense magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Medical implants

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Dust explosion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Eye protection

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Caution! More info about hazards in the article: Safety of working with magnets.