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MW 8x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010103

GTIN/EAN: 5906301811022

5.00

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

product parameters »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Parameters along with shape of a neodymium magnet can be analyzed using our magnetic mass calculator.

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Technical parameters of the product - 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 analysis of the product - report

Presented information constitute the direct effect of a physical calculation. Results are based on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - power drop
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
Pulling power decreases significantly with every subsequent millimeter of distance. Remember that every additional insulation layer (e.g., contamination, paint, veneer) strongly diminishes the holding power. Neodymiums operate strongest at the point of direct contact; gap drastically cuts the power. See how flashily the load capacity drop, when the product does not touch flatly to the metal substrate. When planning the assembly, eliminate redundant distances.

Table 2: Vertical 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 presents the estimated force needed to initiate the slippage of the magnet down on a vertical steel wall (assuming standard friction). The holding force depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 element on a vertical surface (e.g., a fridge), it you can count on barely approx. 1/5 of nominal attraction strength. Gravity and a weak degree of grip influence the fact that products slide down faster than they detach. Designing a vertical fastening? Note that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slide down under a much lighter weight. Application of an anti-slip pad can significantly raise the stability.

Table 4: Steel thickness (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 sheet is unable to take in the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To utilize full efficiency of this magnet's power, you need a suitably thick element of metal. The saturation effect means that on thin elements (e.g., car bodies), the holder works worse. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - power drop
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 irreversibly lose parameters above the temperature limit. Watch out for overheating – excessive heat can permanently destroy this magnet. With increasing heat, the magnet's force temporarily decreases. Do not use this product close to ovens exceeding its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetism.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
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 magnetic products interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a wider radius of operation. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The levitation is marginally weaker than the attraction, but still impressive.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint between the magnets (due to field cancellation).
* Results refer to shear force of two same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Remote 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
Extremely neodym field is a serious hazard to electronic devices and medical implants. These magnets produce a field that disrupts operation of digital equipment. Notice: the unseen radiation passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MW 8x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 39.17 km/h
(10.88 m/s)
 0.07 J
30 mm 67.75 km/h
(18.82 m/s)
 0.20 J
50 mm 87.47 km/h
(24.30 m/s)
 0.33 J
100 mm 123.70 km/h
(34.36 m/s)
 0.67 J
Magnetic elements are delicate – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Surface protection spec
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
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 pole surface. Essential parameter when building generators as well as sensors. Pc value 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%
Corrosion 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Warning: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely limits the holding force.

3. Temperature resistance

*For N38 grade, the safety limit 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 specification and ecology
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%
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
Magnet Unit Converter
Pulling force
Magnetic Field
Input a value in one of the inputs, and the remaining units will recalculate automatically.

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The presented product is a very strong cylinder magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø8x3 mm, guarantees optimal power. The MW 8x3 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 1.70 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 16.67 N with a weight of only 1.13 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method 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 are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 3 mm. The key parameter here is the holding force amounting to approximately 1.70 kg (force ~16.67 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 cylinder is magnetized axially (along the height of 3 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.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • Magnets effectively defend themselves against loss of magnetization caused by foreign field sources,
  • A magnet with a metallic silver surface is more attractive,
  • Magnets have exceptionally strong magnetic induction on the working surface,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in constructing and the capacity to modify to unusual requirements,
  • Versatile presence in innovative solutions – they are used in data components, motor assemblies, diagnostic systems, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as 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 secure oxidation as well as corrosion.
  • Limited possibility of creating threads in the magnet and complicated shapes - recommended is a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these products can be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

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

Magnet power was defined for the most favorable conditions, assuming:
  • using a plate made of low-carbon steel, acting as a ideal flux conductor
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

It is worth knowing that the working load may be lower subject to the following factors, in order of importance:
  • Distance (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
  • Direction of force – highest force is reached only during perpendicular pulling. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin sheet does not accept the full field, causing part of the power to be lost into the air.
  • Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Keep away from computers

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Choking Hazard

These products are not intended for children. Swallowing multiple magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.

Finger safety

Big blocks can smash fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Risk of cracking

Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Medical interference

People with a heart stimulator must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.

Handling rules

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

Dust explosion hazard

Machining of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

GPS and phone interference

GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Operating temperature

Monitor thermal conditions. Heating the magnet to high heat will destroy its properties and strength.

Allergic reactions

Some people have a sensitization to nickel, which is the standard coating for NdFeB magnets. Prolonged contact can result in dermatitis. We recommend wear protective gloves.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?