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MW 40x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010069

GTIN/EAN: 5906301810681

5.00

Diameter Ø

40 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

75.4 g

Magnetization Direction

↑ axial

Load capacity

20.43 kg / 200.39 N

Magnetic Induction

230.22 mT / 2302 Gs

Coating

[NiCuNi] Nickel

technical details »

31.27 ZŁ with VAT / pcs + price for transport

25.42 ZŁ net + 23% VAT / pcs

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Physical properties - MW 40x8 / N38 - cylindrical magnet

Specification / characteristics - MW 40x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010069
GTIN/EAN 5906301810681
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 40 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 75.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 20.43 kg / 200.39 N
Magnetic Induction ~ ? 230.22 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x8 / 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 analysis of the product - report

Presented values represent the outcome of a mathematical calculation. Values rely on models for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs gap) - power drop
MW 40x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2302 Gs
230.2 mT
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
 crushing
1 mm 2235 Gs
223.5 mT
 19.25 kg / 42.44 lbs
19252.0 g / 188.9 N
 crushing
2 mm 2156 Gs
215.6 mT
 17.92 kg / 39.50 lbs
17917.4 g / 175.8 N
 crushing
3 mm 2068 Gs
206.8 mT
 16.49 kg / 36.36 lbs
16490.6 g / 161.8 N
 crushing
5 mm 1875 Gs
187.5 mT
 13.56 kg / 29.89 lbs
13556.7 g / 133.0 N
 crushing
10 mm 1375 Gs
137.5 mT
 7.29 kg / 16.07 lbs
7287.4 g / 71.5 N
 strong
15 mm 959 Gs
95.9 mT
 3.54 kg / 7.81 lbs
3542.3 g / 34.8 N
 strong
20 mm 661 Gs
66.1 mT
 1.68 kg / 3.71 lbs
1684.9 g / 16.5 N
 safe
30 mm 328 Gs
32.8 mT
 0.41 kg / 0.91 lbs
414.2 g / 4.1 N
 safe
50 mm 105 Gs
10.5 mT
 0.04 kg / 0.09 lbs
42.3 g / 0.4 N
 safe
Magnetic force decreases significantly with every mm of gap. Remember that every additional insulation layer (e.g., dirt, varnish, dust) noticeably weakens the grip. Magnets work strongest in perfect adhesion; distance weakens the force. Notice how flashily the parameters plummet, when the magnet does not touch directly to the metal substrate. When planning the mounting, eliminate unnecessary gaps.

Table 2: Vertical hold (wall)
MW 40x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.09 kg / 9.01 lbs
4086.0 g / 40.1 N
1 mm Stal (~0.2) 3.85 kg / 8.49 lbs
3850.0 g / 37.8 N
2 mm Stal (~0.2) 3.58 kg / 7.90 lbs
3584.0 g / 35.2 N
3 mm Stal (~0.2) 3.30 kg / 7.27 lbs
3298.0 g / 32.4 N
5 mm Stal (~0.2) 2.71 kg / 5.98 lbs
2712.0 g / 26.6 N
10 mm Stal (~0.2) 1.46 kg / 3.21 lbs
1458.0 g / 14.3 N
15 mm Stal (~0.2) 0.71 kg / 1.56 lbs
708.0 g / 6.9 N
20 mm Stal (~0.2) 0.34 kg / 0.74 lbs
336.0 g / 3.3 N
30 mm Stal (~0.2) 0.08 kg / 0.18 lbs
82.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
The following data calculates the approximate weight limit needed to initiate the shifting of the magnet down against a vertical metal surface (considering standard friction). This value is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MW 40x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.13 kg / 13.51 lbs
6129.0 g / 60.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.09 kg / 9.01 lbs
4086.0 g / 40.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.04 kg / 4.50 lbs
2043.0 g / 20.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.22 kg / 22.52 lbs
10215.0 g / 100.2 N
When mounting a holder on a vertical plane (e.g., a board), it will only hold just about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that holders move down faster than they pull off. Want to create a wall mount? Consider that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Utilizing a rubberized layer can effectively improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 40x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.02 kg / 2.25 lbs
1021.5 g / 10.0 N
1 mm
13%
 2.55 kg / 5.63 lbs
2553.8 g / 25.1 N
2 mm
25%
 5.11 kg / 11.26 lbs
5107.5 g / 50.1 N
3 mm
38%
 7.66 kg / 16.89 lbs
7661.3 g / 75.2 N
5 mm
63%
 12.77 kg / 28.15 lbs
12768.8 g / 125.3 N
10 mm
100%
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
11 mm
100%
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
12 mm
100%
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
A too thin steel is incapable of absorb the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a too thin substrate, the field will pass right through and the attraction force will be weaker. To utilize the maximum of this magnet's power, you require a sufficiently solid piece of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the product holds weaker. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 40x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
 OK
40 °C -2.2% 19.98 kg / 44.05 lbs
19980.5 g / 196.0 N
 OK
60 °C -4.4% 19.53 kg / 43.06 lbs
19531.1 g / 191.6 N
80 °C -6.6% 19.08 kg / 42.07 lbs
19081.6 g / 187.2 N
100 °C -28.8% 14.55 kg / 32.07 lbs
14546.2 g / 142.7 N
Standard neodymium magnets change their properties strength past the thermal threshold. Protect against heat – high temperature can permanently demagnetize this magnet. With every degree above norm, the magnet's power temporarily decreases. Do not use this product in hot environments exceeding its safe range. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MW 40x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 41.05 kg / 90.51 lbs
3 871 Gs
6.16 kg / 13.58 lbs
6158 g / 60.4 N
 N/A
1 mm 39.92 kg / 88.02 lbs
4 540 Gs
5.99 kg / 13.20 lbs
5989 g / 58.7 N
 35.93 kg / 79.22 lbs
~0 Gs
2 mm 38.69 kg / 85.29 lbs
4 469 Gs
5.80 kg / 12.79 lbs
5803 g / 56.9 N
 34.82 kg / 76.76 lbs
~0 Gs
3 mm 37.38 kg / 82.40 lbs
4 393 Gs
5.61 kg / 12.36 lbs
5606 g / 55.0 N
 33.64 kg / 74.16 lbs
~0 Gs
5 mm 34.59 kg / 76.25 lbs
4 226 Gs
5.19 kg / 11.44 lbs
5188 g / 50.9 N
 31.13 kg / 68.63 lbs
~0 Gs
10 mm 27.24 kg / 60.06 lbs
3 750 Gs
4.09 kg / 9.01 lbs
4086 g / 40.1 N
 24.52 kg / 54.05 lbs
~0 Gs
20 mm 14.64 kg / 32.28 lbs
2 750 Gs
2.20 kg / 4.84 lbs
2197 g / 21.5 N
 13.18 kg / 29.06 lbs
~0 Gs
50 mm 1.65 kg / 3.63 lbs
922 Gs
0.25 kg / 0.54 lbs
247 g / 2.4 N
 1.48 kg / 3.26 lbs
~0 Gs
60 mm 0.83 kg / 1.84 lbs
656 Gs
0.12 kg / 0.28 lbs
125 g / 1.2 N
 0.75 kg / 1.65 lbs
~0 Gs
70 mm 0.44 kg / 0.97 lbs
477 Gs
0.07 kg / 0.15 lbs
66 g / 0.6 N
 0.40 kg / 0.87 lbs
~0 Gs
80 mm 0.24 kg / 0.54 lbs
355 Gs
0.04 kg / 0.08 lbs
37 g / 0.4 N
 0.22 kg / 0.49 lbs
~0 Gs
90 mm 0.14 kg / 0.31 lbs
270 Gs
0.02 kg / 0.05 lbs
21 g / 0.2 N
 0.13 kg / 0.28 lbs
~0 Gs
100 mm 0.09 kg / 0.19 lbs
210 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
 0.08 kg / 0.17 lbs
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and sheet setup. Such a system of two magnets creates a more powerful interaction and a further horizon of operation. Want to build a strong closure? Apply two magnets instead of one magnet and a steel. Remember that when attracting two neodymiums, the impact force is massive. The levitation is slightly lower than the connection force, but still large.
*Field value for N-N configuration drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Figures refer to shear force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - warnings
MW 40x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Timepiece 20 Gs (2.0 mT) 9.5 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Car key 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field is a large risk to electronics as well as medical implants. These magnets generate a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MW 40x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.96 km/h
(5.54 m/s)
 1.16 J
30 mm 29.12 km/h
(8.09 m/s)
 2.47 J
50 mm 37.17 km/h
(10.32 m/s)
 4.02 J
100 mm 52.50 km/h
(14.58 m/s)
 8.02 J
Neodymium magnets are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Kinetic force can cause material chips or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 40x8 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MW 40x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 33 553 Mx 335.5 µWb
Pc Coefficient 0.29 Low (Flat)
Flux value emitted by the magnet pole. Key data in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 40x8 / N38

Environment Effective steel pull Effect
Air (land) 20.43 kg Standard
Water (riverbed) 23.39 kg
(+2.96 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. Shear force

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

2. Plate thickness effect

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

3. Temperature resistance

*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) = 0.29

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
Chemical composition
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: 010069-2026
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The presented product is an incredibly powerful cylindrical magnet, produced from advanced NdFeB material, which, with dimensions of Ø40x8 mm, guarantees optimal power. This specific item features high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 20.43 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 200.39 N with a weight of only 75.4 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., 40.1 mm) using 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.
Magnets NdFeB grade N38 are strong enough 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 (Ø40x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø40x8 mm, which, at a weight of 75.4 g, makes it an element with impressive magnetic energy density. The value of 200.39 N means that the magnet is capable of holding a weight many times exceeding its own mass of 75.4 g. The product has a [NiCuNi] coating, which secures it against oxidation, 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 40 mm. Such an arrangement is most desirable 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 Nd2Fe14B magnets.

Pros

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
  • They possess excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • Thanks to the smooth finish, the plating of nickel, gold-plated, or silver-plated gives an modern appearance,
  • Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of individual shaping and adjusting to complex requirements,
  • Universal use in advanced technology sectors – they are commonly used in mass storage devices, brushless drives, advanced medical instruments, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in miniature devices

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power 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
  • 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 and corrosion.
  • Limited ability of making nuts in the magnet and complex forms - recommended is a housing - magnet mounting.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Additionally, small components of these products can be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

Highest magnetic holding force – what it depends on?

Breakaway force was defined for optimal configuration, taking into account:
  • using a plate made of low-carbon steel, serving as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • under axial force vector (90-degree angle)
  • in temp. approx. 20°C

Key elements affecting lifting force

Bear in mind that the application force will differ subject to elements below, in order of importance:
  • Distance (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel attracts best. Alloy admixtures lower magnetic permeability and holding force.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

Safe handling of neodymium magnets
Keep away from children

Adult use only. Small elements can be swallowed, causing serious injuries. Store away from children and animals.

Health Danger

Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Demagnetization risk

Control the heat. Exposing the magnet to high heat will ruin its properties and pulling force.

Crushing risk

Big blocks can break fingers instantly. Never put your hand betwixt two strong magnets.

Keep away from computers

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Respect the power

Use magnets consciously. Their huge power can shock even professionals. Stay alert and respect their power.

Fragile material

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets leads to them breaking into shards.

Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, avoid direct skin contact or choose versions in plastic housing.

Fire warning

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

GPS and phone interference

Remember: neodymium magnets produce a field that confuses precision electronics. Keep a separation from your phone, tablet, and GPS.

Danger! Need more info? Read our article: Why are neodymium magnets dangerous?