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MW 25x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010049

GTIN/EAN: 5906301810483

5.00

Diameter Ø

25 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

18.41 g

Magnetization Direction

↑ axial

Load capacity

7.98 kg / 78.25 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

see parameters »

8.39 ZŁ with VAT / pcs + price for transport

6.82 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical of the product - MW 25x5 / N38 - cylindrical magnet

Specification / characteristics - MW 25x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010049
GTIN/EAN 5906301810483
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 25 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 18.41 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.98 kg / 78.25 N
Magnetic Induction ~ ? 230.20 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x5 / 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

Engineering simulation of the assembly - technical parameters

These information constitute the direct effect of a mathematical calculation. Values rely on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - interaction chart
MW 25x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2302 Gs
230.2 mT
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
 strong
1 mm 2189 Gs
218.9 mT
 7.21 kg / 15.91 lbs
7214.9 g / 70.8 N
 strong
2 mm 2050 Gs
205.0 mT
 6.33 kg / 13.95 lbs
6329.3 g / 62.1 N
 strong
3 mm 1895 Gs
189.5 mT
 5.41 kg / 11.93 lbs
5410.7 g / 53.1 N
 strong
5 mm 1570 Gs
157.0 mT
 3.72 kg / 8.19 lbs
3715.4 g / 36.4 N
 strong
10 mm 890 Gs
89.0 mT
 1.19 kg / 2.63 lbs
1192.8 g / 11.7 N
 weak grip
15 mm 495 Gs
49.5 mT
 0.37 kg / 0.81 lbs
368.5 g / 3.6 N
 weak grip
20 mm 288 Gs
28.8 mT
 0.12 kg / 0.28 lbs
124.8 g / 1.2 N
 weak grip
30 mm 116 Gs
11.6 mT
 0.02 kg / 0.04 lbs
20.2 g / 0.2 N
 weak grip
50 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 lbs
1.4 g / 0.0 N
 weak grip
Magnetic force decreases sharply with every mm of distance. Keep in mind that even the smallest gap (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Neodymiums hold strongest during direct contact; distance kills the power. See how quickly the pull force drop, when the magnet does not adhere tightly to the metal substrate. When planning the mounting, eliminate additional spacers.

Table 2: Vertical capacity (vertical surface)
MW 25x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.60 kg / 3.52 lbs
1596.0 g / 15.7 N
1 mm Stal (~0.2) 1.44 kg / 3.18 lbs
1442.0 g / 14.1 N
2 mm Stal (~0.2) 1.27 kg / 2.79 lbs
1266.0 g / 12.4 N
3 mm Stal (~0.2) 1.08 kg / 2.39 lbs
1082.0 g / 10.6 N
5 mm Stal (~0.2) 0.74 kg / 1.64 lbs
744.0 g / 7.3 N
10 mm Stal (~0.2) 0.24 kg / 0.52 lbs
238.0 g / 2.3 N
15 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below calculates the theoretical force required to cause the downward movement of the magnet downwards on a upright steel plate (considering typical friction). The holding force depends on the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 25x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.39 kg / 5.28 lbs
2394.0 g / 23.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.60 kg / 3.52 lbs
1596.0 g / 15.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.80 kg / 1.76 lbs
798.0 g / 7.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.99 kg / 8.80 lbs
3990.0 g / 39.1 N
When placing a holder on a upright wall (e.g., a fridge), it you can count on just approx. 1/5 of nominal attraction strength. Gravity and a low friction coefficient cause that magnets move down easier than they pull off. Designing a vertical fastening? Consider that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slide down under a noticeably lighter load. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 25x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.80 kg / 1.76 lbs
798.0 g / 7.8 N
1 mm
25%
 2.00 kg / 4.40 lbs
1995.0 g / 19.6 N
2 mm
50%
 3.99 kg / 8.80 lbs
3990.0 g / 39.1 N
3 mm
75%
 5.99 kg / 13.19 lbs
5985.0 g / 58.7 N
5 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
10 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
11 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
12 mm
100%
 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
A too thin steel is not enough to focus the full magnetic flux, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the flux will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's power, you require a sufficiently solid element of steel. The saturation effect causes that on delicate walls (e.g., appliance housings), the product works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MW 25x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.98 kg / 17.59 lbs
7980.0 g / 78.3 N
 OK
40 °C -2.2% 7.80 kg / 17.21 lbs
7804.4 g / 76.6 N
 OK
60 °C -4.4% 7.63 kg / 16.82 lbs
7628.9 g / 74.8 N
80 °C -6.6% 7.45 kg / 16.43 lbs
7453.3 g / 73.1 N
100 °C -28.8% 5.68 kg / 12.53 lbs
5681.8 g / 55.7 N
Standard neodymium magnets lose strength above the temperature limit. Avoid high temperatures – heat can permanently demagnetize this magnet. With increasing heat, the neodymium's power momentarily drops. Refrain from using this magnet in hot environments exceeding its safe range. Ignoring the limit will result in irreversible degradation of magnetism.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MW 25x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 16.03 kg / 35.34 lbs
3 871 Gs
2.40 kg / 5.30 lbs
2405 g / 23.6 N
 N/A
1 mm 15.31 kg / 33.75 lbs
4 498 Gs
2.30 kg / 5.06 lbs
2296 g / 22.5 N
 13.78 kg / 30.38 lbs
~0 Gs
2 mm 14.49 kg / 31.95 lbs
4 377 Gs
2.17 kg / 4.79 lbs
2174 g / 21.3 N
 13.05 kg / 28.76 lbs
~0 Gs
3 mm 13.62 kg / 30.03 lbs
4 243 Gs
2.04 kg / 4.50 lbs
2043 g / 20.0 N
 12.26 kg / 27.03 lbs
~0 Gs
5 mm 11.79 kg / 26.00 lbs
3 948 Gs
1.77 kg / 3.90 lbs
1769 g / 17.4 N
 10.61 kg / 23.40 lbs
~0 Gs
10 mm 7.46 kg / 16.46 lbs
3 141 Gs
1.12 kg / 2.47 lbs
1120 g / 11.0 N
 6.72 kg / 14.81 lbs
~0 Gs
20 mm 2.40 kg / 5.28 lbs
1 780 Gs
0.36 kg / 0.79 lbs
359 g / 3.5 N
 2.16 kg / 4.75 lbs
~0 Gs
50 mm 0.10 kg / 0.21 lbs
355 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.09 kg / 0.19 lbs
~0 Gs
60 mm 0.04 kg / 0.09 lbs
231 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
70 mm 0.02 kg / 0.04 lbs
158 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
80 mm 0.01 kg / 0.02 lbs
112 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.01 kg / 0.01 lbs
82 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
62 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 significantly greater distance than a neodymium and metal setup. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Designing a strong closure? Apply two magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The repulsion force is a bit weaker than the connection force, but still large.
*Flux density between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
Note: Figures demonstrate sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MW 25x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 5.0 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field is a serious hazard to electronic devices and medical implants. These magnets generate a field that disrupts operation of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MW 25x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.87 km/h
(6.35 m/s)
 0.37 J
30 mm 36.43 km/h
(10.12 m/s)
 0.94 J
50 mm 46.96 km/h
(13.04 m/s)
 1.57 J
100 mm 66.40 km/h
(18.44 m/s)
 3.13 J
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Corrosion resistance
MW 25x5 / 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: Construction data (Pc)
MW 25x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 13 107 Mx 131.1 µWb
Pc Coefficient 0.29 Low (Flat)
Total magnetic flux passing through the pole surface. Key data for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MW 25x5 / N38

Environment Effective steel pull Effect
Air (land) 7.98 kg Standard
Water (riverbed) 9.14 kg
(+1.16 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Power loss vs temp

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.29

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%
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: 010049-2026
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The offered product is a very strong cylindrical magnet, composed of durable NdFeB material, which, with dimensions of Ø25x5 mm, guarantees the highest energy density. The MW 25x5 / N38 model is characterized by a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 7.98 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 78.25 N with a weight of only 18.41 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, 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 do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø25x5), 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 Ø25x5 mm, which, at a weight of 18.41 g, makes it an element with impressive magnetic energy density. The value of 78.25 N means that the magnet is capable of holding a weight many times exceeding its own mass of 18.41 g. 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 5 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Pros and cons of Nd2Fe14B magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose magnetism, even during around ten years – the reduction in power is only ~1% (theoretically),
  • They possess excellent resistance to magnetism drop as a result of external magnetic sources,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the top side of the magnet turns out to be exceptional,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of detailed machining and adapting to concrete requirements,
  • Universal use in innovative solutions – they find application in magnetic memories, brushless drives, medical equipment, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Disadvantages

Problematic aspects of neodymium magnets and ways of using them
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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 those in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of producing threads in the magnet and complicated shapes - recommended is a housing - mounting mechanism.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The load parameter shown refers to the maximum value, recorded under optimal environment, meaning:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction vertical to the plane
  • at ambient temperature room level

Determinants of lifting force in real conditions

Please note that the magnet holding will differ subject to elements below, in order of importance:
  • Distance – the presence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. High carbon content weaken the attraction effect.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Cards and drives

Do not bring magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

GPS and phone interference

An intense magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets near a smartphone to avoid breaking the sensors.

Risk of cracking

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Permanent damage

Standard neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Swallowing risk

NdFeB magnets are not suitable for play. Swallowing a few magnets may result in them attracting across intestines, which constitutes a critical condition and necessitates urgent medical intervention.

Pinching danger

Big blocks can crush fingers instantly. Never place your hand betwixt two strong magnets.

Machining danger

Powder generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Skin irritation risks

Medical facts indicate that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands or select versions in plastic housing.

Implant safety

Individuals with a heart stimulator must maintain an absolute distance from magnets. The magnetism can stop the operation of the implant.

Respect the power

Use magnets with awareness. Their huge power can surprise even professionals. Plan your moves and do not underestimate their power.

Security! Learn more about hazards in the article: Magnet Safety Guide.