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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
see technical specifications »

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 - 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 - technical parameters

These information represent the outcome of a physical simulation. Values are based on models for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Please consider these calculations as a supplementary guide during assembly planning.

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
Pulling power drops significantly with every mm of gap. Note that even a very thin break (e.g., dirt, varnish, rust) significantly reduces the pull force. Magnetic products hold strongest at the point of direct contact; distance nullifies the force. Observe how quickly the pull force plummet, when the magnet does not touch tightly to the metal substrate. When planning the mounting, eliminate additional spacers.

Table 2: Vertical load (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
This section defines the approximate force needed to cause the shifting of the magnet down along a upright steel wall (assuming typical friction). The holding force is a function of the gap size 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 hanging a magnet on a upright surface (e.g., a board), it will only hold only approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that holders move down easier than they pull off. Designing a hanger? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a much lighter weight. Application of an anti-slip layer can significantly raise the stability.

Table 4: Material efficiency (saturation) - 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 metal plate is incapable of focus the entire magnetic field, which weakens actual performance of the holder. If you install a neodymium to a thin surface, the magnetism will pass right through and the holding will be smaller. To achieve the maximum of this magnet's potential, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - 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
Classic neodymiums change their properties strength past the thermal threshold. Protect against heat – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's power briefly decreases. Refrain from using this product close to heaters higher than its operating temperature limit. Too high temperature will lead to permanent loss of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
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 strong neodymiums interact from a wider radius than a magnet and steel combination. Such a system of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Designing a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, but still large.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Note: Estimates demonstrate shear force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (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 is a real danger to electronic devices as well as pacemakers. These NdFeB products generate a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
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
NdFeB products are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments 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 contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MW 4x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 836 Mx 8.4 µWb
Pc Coefficient 1.21 High (Stable)
Flux value passing through the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
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.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Note: On a vertical wall, the magnet retains only a fraction of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Temperature resistance

*For N38 material, 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.

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%

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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MW 14x2 / N38 - cylindrical magnet

0.898 zł brutto / pcs
This product is a very strong cylinder magnet, produced from advanced NdFeB material, which, with dimensions of Ø4x8 mm, guarantees the highest energy density. The MW 4x8 / N38 component features a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 0.35 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 3.48 N with a weight of only 0.75 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in modeling 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 store.
This model is characterized by dimensions Ø4x8 mm, which, at a weight of 0.75 g, makes it an element with impressive magnetic energy density. The value of 3.48 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.75 g. The product has a [NiCuNi] coating, which secures it against oxidation, 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 through the diameter if your project requires it.

Advantages and disadvantages of neodymium magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain magnetic properties for around ten years – the loss is just ~1% (based on simulations),
  • Magnets very well defend themselves against loss of magnetization caused by external fields,
  • By using a lustrous coating of gold, the element acquires an professional look,
  • Magnetic induction on the working layer of the magnet is maximum,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to modularity in constructing and the ability to modify to unusual requirements,
  • Huge importance in advanced technology sectors – they are commonly used in mass storage devices, brushless drives, diagnostic systems, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices

Weaknesses

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. 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
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating nuts in the magnet and complex forms - preferred is a housing - mounting mechanism.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Holding force characteristics

Maximum lifting capacity of the magnet – what contributes to it?

Magnet power was defined for the most favorable conditions, including:
  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • whose thickness is min. 10 mm
  • with an ground contact surface
  • with direct contact (without paint)
  • during pulling in a direction vertical to the mounting surface
  • at room temperature

Lifting capacity in real conditions – factors

Please note that the working load will differ subject to the following factors, starting with the most relevant:
  • Clearance – the presence of foreign body (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped to the other side.
  • Metal type – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures 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 a perpendicular force was applied, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Safe operation

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Electronic devices

Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Warning for allergy sufferers

Certain individuals suffer from a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact might lead to skin redness. We strongly advise use safety gloves.

Crushing force

Large magnets can break fingers instantly. Do not place your hand between two attracting surfaces.

This is not a toy

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.

Health Danger

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Maximum temperature

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Mechanical processing

Dust created during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Threat to navigation

An intense magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Keep magnets near a device to avoid breaking the sensors.

Shattering risk

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?