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MW 25x5 / N38AH - cylindrical magnet

cylindrical magnet

Catalog no 010501

GTIN/EAN: 5906301814993

Load capacity 7.29 kg / 71.47 N Magnetic Induction 219.99 mT / 2200 Gs
Diameter Ø
25 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
18.41 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

13.56net / pcs

16.68 zł with VAT (23% VAT) / pcs

price for transport

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Gross
price from 1 pcs
13.56 zł
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15.68 zł
price from 190 pcs
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Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

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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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Detailed specification - MW 25x5 / N38AH - cylindrical magnet

Specification / characteristics - MW 25x5 / N38AH - cylindrical magnet

properties
properties values
Cat. no. 010501
GTIN/EAN 5906301814993
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 ~ ? 7.29 kg / 71.47 N
Magnetic Induction ~ ? 219.99 mT / 2200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38AH

Specification / characteristics MW 25x5 / N38AH - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.5 kGs
remenance Br [min. - max.] ? 1120-1250 mT
coercivity bHc ? ≥ 11.3 kOe
coercivity bHc ? ≥ 899 kA/m
actual internal force iHc ≥ 33 kOe
actual internal force iHc ≥ 2624 kA/m
energy density [min. - max.] ? 36-39 BH max MGOe
energy density [min. - max.] ? 287-310 BH max KJ/m
max. temperature ? ≤ 230 °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 310 °C
Curie Temperature TF 590 °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 product - technical parameters

Presented values constitute the outcome of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
MW 25x5 / N38AH

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2292 Gs
229.2 mT
7.29 kg / 16.07 LBS
7290.0 g / 71.5 N
medium risk
1 mm 2180 Gs
218.0 mT
6.59 kg / 14.53 LBS
6591.0 g / 64.7 N
medium risk
2 mm 2042 Gs
204.2 mT
5.78 kg / 12.75 LBS
5782.0 g / 56.7 N
medium risk
3 mm 1888 Gs
188.8 mT
4.94 kg / 10.90 LBS
4942.8 g / 48.5 N
medium risk
5 mm 1564 Gs
156.4 mT
3.39 kg / 7.48 LBS
3394.1 g / 33.3 N
medium risk
10 mm 886 Gs
88.6 mT
1.09 kg / 2.40 LBS
1089.7 g / 10.7 N
safe
15 mm 493 Gs
49.3 mT
0.34 kg / 0.74 LBS
336.7 g / 3.3 N
safe
20 mm 287 Gs
28.7 mT
0.11 kg / 0.25 LBS
114.0 g / 1.1 N
safe
30 mm 115 Gs
11.5 mT
0.02 kg / 0.04 LBS
18.4 g / 0.2 N
safe
50 mm 31 Gs
3.1 mT
0.00 kg / 0.00 LBS
1.3 g / 0.0 N
safe

Table 2: Slippage capacity (vertical surface)
MW 25x5 / N38AH

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.46 kg / 3.21 LBS
1458.0 g / 14.3 N
1 mm Stal (~0.2) 1.32 kg / 2.91 LBS
1318.0 g / 12.9 N
2 mm Stal (~0.2) 1.16 kg / 2.55 LBS
1156.0 g / 11.3 N
3 mm Stal (~0.2) 0.99 kg / 2.18 LBS
988.0 g / 9.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 LBS
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.22 kg / 0.48 LBS
218.0 g / 2.1 N
15 mm Stal (~0.2) 0.07 kg / 0.15 LBS
68.0 g / 0.7 N
20 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 25x5 / N38AH

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.19 kg / 4.82 LBS
2187.0 g / 21.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.46 kg / 3.21 LBS
1458.0 g / 14.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.73 kg / 1.61 LBS
729.0 g / 7.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.65 kg / 8.04 LBS
3645.0 g / 35.8 N

Table 4: Steel thickness (saturation) - power losses
MW 25x5 / N38AH

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.73 kg / 1.61 LBS
729.0 g / 7.2 N
1 mm
25%
1.82 kg / 4.02 LBS
1822.5 g / 17.9 N
2 mm
50%
3.65 kg / 8.04 LBS
3645.0 g / 35.8 N
3 mm
75%
5.47 kg / 12.05 LBS
5467.5 g / 53.6 N
5 mm
100%
7.29 kg / 16.07 LBS
7290.0 g / 71.5 N
10 mm
100%
7.29 kg / 16.07 LBS
7290.0 g / 71.5 N
11 mm
100%
7.29 kg / 16.07 LBS
7290.0 g / 71.5 N
12 mm
100%
7.29 kg / 16.07 LBS
7290.0 g / 71.5 N

Table 5: Thermal stability (stability) - power drop
MW 25x5 / N38AH

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.29 kg / 16.07 LBS
7290.0 g / 71.5 N
OK
80 °C -6.6% 6.81 kg / 15.01 LBS
6808.9 g / 66.8 N
150 °C -14.3% 6.25 kg / 13.77 LBS
6247.5 g / 61.3 N
200 °C -19.8% 5.85 kg / 12.89 LBS
5846.6 g / 57.4 N
230 °C -23.1% 5.61 kg / 12.36 LBS
5606.0 g / 55.0 N
250 °C -45.3% 3.99 kg / 8.79 LBS
3987.6 g / 39.1 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 25x5 / N38AH

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 15.90 kg / 35.06 LBS
3 855 Gs
2.39 kg / 5.26 LBS
2385 g / 23.4 N
N/A
1 mm 15.19 kg / 33.48 LBS
4 480 Gs
2.28 kg / 5.02 LBS
2278 g / 22.3 N
13.67 kg / 30.13 LBS
~0 Gs
2 mm 14.38 kg / 31.70 LBS
4 359 Gs
2.16 kg / 4.75 LBS
2157 g / 21.2 N
12.94 kg / 28.53 LBS
~0 Gs
3 mm 13.51 kg / 29.79 LBS
4 226 Gs
2.03 kg / 4.47 LBS
2027 g / 19.9 N
12.16 kg / 26.81 LBS
~0 Gs
5 mm 11.70 kg / 25.79 LBS
3 932 Gs
1.75 kg / 3.87 LBS
1755 g / 17.2 N
10.53 kg / 23.21 LBS
~0 Gs
10 mm 7.40 kg / 16.32 LBS
3 128 Gs
1.11 kg / 2.45 LBS
1111 g / 10.9 N
6.66 kg / 14.69 LBS
~0 Gs
20 mm 2.38 kg / 5.24 LBS
1 773 Gs
0.36 kg / 0.79 LBS
357 g / 3.5 N
2.14 kg / 4.72 LBS
~0 Gs
50 mm 0.09 kg / 0.21 LBS
354 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
157 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

Table 7: Hazards (electronics) - precautionary measures
MW 25x5 / N38AH

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Timepiece 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 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

Table 8: Collisions (cracking risk) - collision effects
MW 25x5 / N38AH

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.63 km/h
(6.29 m/s)
0.36 J
30 mm 24.03 km/h
(6.67 m/s)
0.41 J
50 mm 24.06 km/h
(6.68 m/s)
0.41 J
100 mm 24.07 km/h
(6.69 m/s)
0.41 J

Table 9: Surface protection spec
MW 25x5 / N38AH

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 (Pc)
MW 25x5 / N38AH

Parameter Value SI Unit / Description
Magnetic Flux 13 054 Mx 130.5 µWb
Pc Coefficient 0.29 Low (Flat)

Table 11: Submerged application
MW 25x5 / N38AH

Environment Effective steel pull Effect
Air (land) 7.29 kg Standard
Water (riverbed) 8.35 kg
(+1.06 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

1. Sliding resistance

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Power loss vs temp

*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) = 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 and environmental data

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: 010501-2026
Measurement Calculator

Magnet pull force


Magnetic Field

Check out also deals

This product is a very strong rod magnet, composed of advanced NdFeB material, which, at dimensions of Ø25x5 mm, guarantees optimal power. This specific item is characterized by a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 7.29 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 71.47 N with a weight of only 18.41 g, this cylindrical magnet is indispensable in electronics 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., 25.1 mm) using 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.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø25x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf 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 key parameter here is the lifting capacity amounting to approximately 7.29 kg (force ~71.47 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 25 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 through the diameter if your project requires it.

Pros as well as cons of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their power is durable, and after approximately ten years it drops only by ~1% (theoretically),
  • They retain their magnetic properties even under close interference source,
  • Thanks to the metallic finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the potential of free shaping and adaptation to unique projects, NdFeB magnets can be modeled in a broad palette of forms and dimensions, which increases their versatility,
  • Versatile presence in future technologies – they find application in data components, motor assemblies, medical devices, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Problematic aspects of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Maximum lifting capacity of the magnetwhat affects it?

The load parameter shown concerns the peak performance, recorded under ideal test conditions, specifically:
  • with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ideally smooth contact surface
  • with total lack of distance (no impurities)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Key elements affecting lifting force

It is worth knowing that the magnet holding may be lower depending on elements below, starting with the most relevant:
  • Gap (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material type – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Precautions when working with neodymium magnets
Flammability

Fire hazard: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Serious injuries

Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

Life threat

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

GPS Danger

GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Handling rules

Be careful. Rare earth magnets act from a long distance and connect with massive power, often quicker than you can move away.

Danger to the youngest

Absolutely keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are fatal.

Magnetic media

Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Operating temperature

Do not overheat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Protective goggles

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them shattering into shards.

Skin irritation risks

Medical facts indicate that nickel (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands and choose coated magnets.

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