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MW 8x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010103

GTIN/EAN: 5906301811022

5.00
Load capacity 1.70 kg / 16.67 N Magnetic Induction 371.53 mT / 3715 Gs
Diameter Ø
8 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.13 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 - MW 8x3 / N38 - cylindrical magnet

Specification / characteristics - MW 8x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010103
GTIN/EAN 5906301811022
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 8 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 1.13 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.70 kg / 16.67 N
Magnetic Induction ~ ? 371.53 mT / 3715 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x3 / 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 magnet - data

These data represent the direct effect of a physical calculation. Results are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - characteristics
MW 8x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3712 Gs
371.2 mT
 1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
 low risk
1 mm 2880 Gs
288.0 mT
 1.02 kg / 2.26 LBS
1023.3 g / 10.0 N
 low risk
2 mm 2069 Gs
206.9 mT
 0.53 kg / 1.16 LBS
527.9 g / 5.2 N
 low risk
3 mm 1439 Gs
143.9 mT
 0.26 kg / 0.56 LBS
255.3 g / 2.5 N
 low risk
5 mm 704 Gs
70.4 mT
 0.06 kg / 0.13 LBS
61.1 g / 0.6 N
 low risk
10 mm 169 Gs
16.9 mT
 0.00 kg / 0.01 LBS
3.5 g / 0.0 N
 low risk
15 mm 62 Gs
6.2 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 low risk
20 mm 29 Gs
2.9 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 low risk
30 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
50 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Magnetic force weakens drastically with every subsequent millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, rust) significantly diminishes the holding power. Neodymiums hold optimally in perfect adhesion; gap nullifies the power. Notice how quickly the parameters fall, when the product does not touch tightly to the steel surface. When designing the assembly, avoid additional spacers.

Table 2: Slippage capacity (wall)
MW 8x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.34 kg / 0.75 LBS
340.0 g / 3.3 N
1 mm Stal (~0.2) 0.20 kg / 0.45 LBS
204.0 g / 2.0 N
2 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.05 kg / 0.11 LBS
52.0 g / 0.5 N
5 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 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 indicates the theoretical shear load necessary to cause the sliding of the magnet down against a vertical steel wall (considering standard friction). This value is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MW 8x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.51 kg / 1.12 LBS
510.0 g / 5.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.85 kg / 1.87 LBS
850.0 g / 8.3 N
When mounting a magnet on a upright plane (e.g., a car body), it will maintain barely approx. 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that magnets slip easier than they pull off. Want to create a wall mount? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the holder will give way down under a much lighter weight. Using a rubber pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.17 kg / 0.37 LBS
170.0 g / 1.7 N
1 mm
25%
 0.43 kg / 0.94 LBS
425.0 g / 4.2 N
2 mm
50%
 0.85 kg / 1.87 LBS
850.0 g / 8.3 N
3 mm
75%
 1.28 kg / 2.81 LBS
1275.0 g / 12.5 N
5 mm
100%
 1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
10 mm
100%
 1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
11 mm
100%
 1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
12 mm
100%
 1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
A thin metal plate cannot take in the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you require a sufficiently solid element of metal. The material oversaturation causes that on thin elements (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (stability) - thermal limit
MW 8x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
 OK
40 °C -2.2% 1.66 kg / 3.67 LBS
1662.6 g / 16.3 N
 OK
60 °C -4.4% 1.63 kg / 3.58 LBS
1625.2 g / 15.9 N
80 °C -6.6% 1.59 kg / 3.50 LBS
1587.8 g / 15.6 N
100 °C -28.8% 1.21 kg / 2.67 LBS
1210.4 g / 11.9 N
Classic neodymiums change their properties parameters after exceeding the maximum temperature. Protect against heat – heat can irreversibly demagnetize this product. With increasing heat, the neodymium's capacity briefly lowers. Refrain from using this product close to ovens higher than its operating temperature limit. Exceeding the critical threshold will cause destruction of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 8x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.27 kg / 9.42 LBS
5 146 Gs
0.64 kg / 1.41 LBS
641 g / 6.3 N
 N/A
1 mm 3.40 kg / 7.50 LBS
6 627 Gs
0.51 kg / 1.13 LBS
510 g / 5.0 N
 3.06 kg / 6.75 LBS
~0 Gs
2 mm 2.57 kg / 5.67 LBS
5 761 Gs
0.39 kg / 0.85 LBS
386 g / 3.8 N
 2.31 kg / 5.10 LBS
~0 Gs
3 mm 1.87 kg / 4.12 LBS
4 914 Gs
0.28 kg / 0.62 LBS
281 g / 2.8 N
 1.68 kg / 3.71 LBS
~0 Gs
5 mm 0.93 kg / 2.04 LBS
3 456 Gs
0.14 kg / 0.31 LBS
139 g / 1.4 N
 0.83 kg / 1.84 LBS
~0 Gs
10 mm 0.15 kg / 0.34 LBS
1 408 Gs
0.02 kg / 0.05 LBS
23 g / 0.2 N
 0.14 kg / 0.30 LBS
~0 Gs
20 mm 0.01 kg / 0.02 LBS
339 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
31 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
19 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
12 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
8 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
6 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
4 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 setup. The setup of two magnets creates a more powerful interaction and a further horizon of operation. Want to build a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the pinch force is huge. The repulsion force is marginally weaker than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Figures apply to shear force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
MW 8x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Mechanical watch 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a serious hazard to electronics as well as pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Notice: the unseen radiation penetrates the body and glass. Special caution must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 8x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.33 km/h
(7.04 m/s)
 0.03 J
30 mm 25.37 km/h
(7.05 m/s)
 0.03 J
50 mm 25.37 km/h
(7.05 m/s)
 0.03 J
100 mm 25.37 km/h
(7.05 m/s)
 0.03 J
NdFeB products are very brittle – a collision with steel causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or injury to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
MW 8x3 / 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 (Pc)
MW 8x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 946 Mx 19.5 µWb
Pc Coefficient 0.48 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MW 8x3 / N38

Environment Effective steel pull Effect
Air (land) 1.70 kg Standard
Water (riverbed) 1.95 kg
(+0.25 kg buoyancy gain)
+14.5%
Rust risk: 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

*Caution: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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.

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%

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: 010103-2026
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The presented product is an incredibly powerful cylindrical magnet, manufactured from durable NdFeB material, which, at dimensions of Ø8x3 mm, guarantees maximum efficiency. The MW 8x3 / N38 model boasts high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 1.70 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 16.67 N with a weight of only 1.13 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø8x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø8x3 mm, which, at a weight of 1.13 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 1.70 kg (force ~16.67 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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 8 mm. 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.

Strengths and weaknesses of neodymium magnets.

Pros

Besides their immense pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • They possess excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the surface of the magnet remains strong,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of accurate modeling as well as optimizing to individual applications,
  • Key role in innovative solutions – they are commonly used in magnetic memories, drive modules, medical equipment, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in producing nuts and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small elements of these products can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

Information about lifting capacity was defined for the most favorable conditions, including:
  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section no less than 10 mm
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

Effective lifting capacity is affected by working environment parameters, mainly (from most important):
  • Distance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

Warnings
GPS Danger

Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your mobile, tablet, and GPS.

Allergy Warning

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness happens, cease handling magnets and use protective gear.

Medical interference

For implant holders: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Dust explosion hazard

Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Conscious usage

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Data carriers

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Operating temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Keep away from children

Strictly store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are very dangerous.

Serious injuries

Large magnets can crush fingers instantly. Never put your hand between two strong magnets.

Risk of cracking

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

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