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MW 5x25 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010086

GTIN/EAN: 5906301810858

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

25 mm [±0,1 mm]

Weight

3.68 g

Magnetization Direction

↑ axial

Load capacity

0.45 kg / 4.41 N

Magnetic Induction

615.39 mT / 6154 Gs

Coating

[NiCuNi] Nickel

2.31 with VAT / pcs + price for transport

1.880 ZŁ net + 23% VAT / pcs

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Technical data - MW 5x25 / N38 - cylindrical magnet

Specification / characteristics - MW 5x25 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010086
GTIN/EAN 5906301810858
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 5 mm [±0,1 mm]
Height 25 mm [±0,1 mm]
Weight 3.68 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.45 kg / 4.41 N
Magnetic Induction ~ ? 615.39 mT / 6154 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x25 / 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 product - data

The following information constitute the outcome of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - power drop
MW 5x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6144 Gs
614.4 mT
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
weak grip
1 mm 3869 Gs
386.9 mT
0.18 kg / 0.39 LBS
178.4 g / 1.8 N
weak grip
2 mm 2300 Gs
230.0 mT
0.06 kg / 0.14 LBS
63.1 g / 0.6 N
weak grip
3 mm 1412 Gs
141.2 mT
0.02 kg / 0.05 LBS
23.8 g / 0.2 N
weak grip
5 mm 633 Gs
63.3 mT
0.00 kg / 0.01 LBS
4.8 g / 0.0 N
weak grip
10 mm 169 Gs
16.9 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
weak grip
15 mm 72 Gs
7.2 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
weak grip
20 mm 38 Gs
3.8 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
30 mm 15 Gs
1.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
50 mm 4 Gs
0.4 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Vertical force (wall)
MW 5x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
1 mm Stal (~0.2) 0.04 kg / 0.08 LBS
36.0 g / 0.4 N
2 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 5x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.14 kg / 0.30 LBS
135.0 g / 1.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.23 kg / 0.50 LBS
225.0 g / 2.2 N

Table 4: Material efficiency (substrate influence) - power losses
MW 5x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
1 mm
25%
0.11 kg / 0.25 LBS
112.5 g / 1.1 N
2 mm
50%
0.23 kg / 0.50 LBS
225.0 g / 2.2 N
3 mm
75%
0.34 kg / 0.74 LBS
337.5 g / 3.3 N
5 mm
100%
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
10 mm
100%
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
11 mm
100%
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
12 mm
100%
0.45 kg / 0.99 LBS
450.0 g / 4.4 N

Table 5: Thermal stability (stability) - power drop
MW 5x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.45 kg / 0.99 LBS
450.0 g / 4.4 N
OK
40 °C -2.2% 0.44 kg / 0.97 LBS
440.1 g / 4.3 N
OK
60 °C -4.4% 0.43 kg / 0.95 LBS
430.2 g / 4.2 N
OK
80 °C -6.6% 0.42 kg / 0.93 LBS
420.3 g / 4.1 N
100 °C -28.8% 0.32 kg / 0.71 LBS
320.4 g / 3.1 N

Table 6: Two magnets (attraction) - field range
MW 5x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.57 kg / 10.08 LBS
6 167 Gs
0.69 kg / 1.51 LBS
686 g / 6.7 N
N/A
1 mm 2.97 kg / 6.55 LBS
9 909 Gs
0.45 kg / 0.98 LBS
446 g / 4.4 N
2.67 kg / 5.90 LBS
~0 Gs
2 mm 1.81 kg / 3.99 LBS
7 738 Gs
0.27 kg / 0.60 LBS
272 g / 2.7 N
1.63 kg / 3.60 LBS
~0 Gs
3 mm 1.08 kg / 2.37 LBS
5 965 Gs
0.16 kg / 0.36 LBS
162 g / 1.6 N
0.97 kg / 2.14 LBS
~0 Gs
5 mm 0.39 kg / 0.86 LBS
3 581 Gs
0.06 kg / 0.13 LBS
58 g / 0.6 N
0.35 kg / 0.77 LBS
~0 Gs
10 mm 0.05 kg / 0.11 LBS
1 266 Gs
0.01 kg / 0.02 LBS
7 g / 0.1 N
0.04 kg / 0.10 LBS
~0 Gs
20 mm 0.00 kg / 0.01 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
46 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
30 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
21 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
15 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
11 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
9 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Hazards (implants) - warnings
MW 5x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 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

Table 8: Collisions (cracking risk) - warning
MW 5x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 11.16 km/h
(3.10 m/s)
0.02 J
30 mm 19.32 km/h
(5.37 m/s)
0.05 J
50 mm 24.94 km/h
(6.93 m/s)
0.09 J
100 mm 35.27 km/h
(9.80 m/s)
0.18 J

Table 9: Surface protection spec
MW 5x25 / 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)

Table 10: Construction data (Flux)
MW 5x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 450 Mx 14.5 µWb
Pc Coefficient 1.55 High (Stable)

Table 11: Submerged application
MW 5x25 / N38

Environment Effective steel pull Effect
Air (land) 0.45 kg Standard
Water (riverbed) 0.52 kg
(+0.07 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds only a fraction of its max power.

2. Steel saturation

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.55

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.

Technical specification and ecology
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: 010086-2026
Measurement Calculator
Force (pull)

Field Strength

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The offered product is an exceptionally strong cylinder magnet, made from advanced NdFeB material, which, with dimensions of Ø5x25 mm, guarantees the highest energy density. This specific item features an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 0.45 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 4.41 N with a weight of only 3.68 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability 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 the strongest magnets in the same volume (Ø5x25), 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 Ø5x25 mm, which, at a weight of 3.68 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 0.45 kg (force ~4.41 N), which, with such defined dimensions, proves the high grade of the NdFeB material. 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 5 mm. 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 diametrically if your project requires it.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Besides their immense magnetic power, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They have excellent resistance to weakening of magnetic properties when exposed to external fields,
  • By covering with a shiny layer of gold, the element presents an elegant look,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
  • 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 custom shaping as well as modifying to defined needs,
  • Key role in high-tech industry – they are commonly used in magnetic memories, electric motors, medical equipment, as well as industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Cons of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum lifting capacity of the magnetwhat it depends on?

The load parameter shown concerns the maximum value, measured under ideal test conditions, meaning:
  • using a base made of high-permeability steel, acting as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • characterized by lack of roughness
  • with total lack of distance (without impurities)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower subject to the following factors, starting with the most relevant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Material type – the best choice is high-permeability steel. Cast iron may attract less.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Danger to the youngest

Neodymium magnets are not toys. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.

Threat to navigation

Note: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, device, and navigation systems.

ICD Warning

People with a pacemaker have to keep an large gap from magnets. The magnetic field can stop the operation of the implant.

Dust is flammable

Combustion risk: Rare earth powder is explosive. Avoid machining magnets in home conditions as this risks ignition.

Bone fractures

Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying anything in their path. Be careful!

Permanent damage

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

Eye protection

Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Keep away from computers

Powerful magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Warning for allergy sufferers

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for encased magnets.

Handling rules

Be careful. Neodymium magnets act from a long distance and snap with massive power, often faster than you can move away.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98