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MW 25x12 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010502

GTIN/EAN: 5906301814986

5.00
Load capacity 19.60 kg / 192.25 N Magnetic Induction 429.18 mT / 4292 Gs
Diameter Ø
25 mm [±0,1 mm]
Height
12 mm [±0,1 mm]
Weight
44.18 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical parameters »

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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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Technical details - MW 25x12 / N38 - cylindrical magnet

Specification / characteristics - MW 25x12 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010502
GTIN/EAN 5906301814986
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 12 mm [±0,1 mm]
Weight 44.18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.60 kg / 192.25 N
Magnetic Induction ~ ? 429.18 mT / 4292 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x12 / 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 modeling of the assembly - data

These data are the direct effect of a engineering simulation. Values are based on models for the class Nd2Fe14B. Operational conditions might slightly differ. Treat these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
MW 25x12 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4291 Gs
429.1 mT
 19.60 kg / 43.21 lbs
19600.0 g / 192.3 N
 dangerous!
1 mm 3975 Gs
397.5 mT
 16.82 kg / 37.08 lbs
16820.5 g / 165.0 N
 dangerous!
2 mm 3645 Gs
364.5 mT
 14.15 kg / 31.19 lbs
14147.5 g / 138.8 N
 dangerous!
3 mm 3316 Gs
331.6 mT
 11.71 kg / 25.81 lbs
11707.5 g / 114.9 N
 dangerous!
5 mm 2692 Gs
269.2 mT
 7.72 kg / 17.02 lbs
7718.0 g / 75.7 N
 strong
10 mm 1518 Gs
151.8 mT
 2.45 kg / 5.41 lbs
2451.8 g / 24.1 N
 strong
15 mm 863 Gs
86.3 mT
 0.79 kg / 1.75 lbs
793.5 g / 7.8 N
 low risk
20 mm 517 Gs
51.7 mT
 0.29 kg / 0.63 lbs
285.1 g / 2.8 N
 low risk
30 mm 219 Gs
21.9 mT
 0.05 kg / 0.11 lbs
51.2 g / 0.5 N
 low risk
50 mm 63 Gs
6.3 mT
 0.00 kg / 0.01 lbs
4.2 g / 0.0 N
 low risk
Grip strength drops drastically per each millimeter of distance. Remember that even a microscopic distance (e.g., dirt, varnish, dust) strongly reduces the pull force. Magnets hold strongest at the point of direct contact; distance weakens the power. Notice how flashily the pull force plummet, when the magnet does not adhere tightly to the metal substrate. When planning the arrangement, avoid additional spacers.

Table 2: Shear capacity (wall)
MW 25x12 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.92 kg / 8.64 lbs
3920.0 g / 38.5 N
1 mm Stal (~0.2) 3.36 kg / 7.42 lbs
3364.0 g / 33.0 N
2 mm Stal (~0.2) 2.83 kg / 6.24 lbs
2830.0 g / 27.8 N
3 mm Stal (~0.2) 2.34 kg / 5.16 lbs
2342.0 g / 23.0 N
5 mm Stal (~0.2) 1.54 kg / 3.40 lbs
1544.0 g / 15.1 N
10 mm Stal (~0.2) 0.49 kg / 1.08 lbs
490.0 g / 4.8 N
15 mm Stal (~0.2) 0.16 kg / 0.35 lbs
158.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data defines the estimated weight limit required to start the sliding of the magnet vertically against a upright steel plate (assuming standard friction coefficient). This value is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 25x12 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.88 kg / 12.96 lbs
5880.0 g / 57.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.92 kg / 8.64 lbs
3920.0 g / 38.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.96 kg / 4.32 lbs
1960.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.80 kg / 21.61 lbs
9800.0 g / 96.1 N
When hanging a holder on a vertical plane (e.g., a board), it will only hold just about 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that magnets slide down faster than they pop off the substrate. Planning a vertical fastening? Consider that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the element will slide down under a noticeably lighter load. Application of an anti-slip layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 25x12 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.98 kg / 2.16 lbs
980.0 g / 9.6 N
1 mm
13%
 2.45 kg / 5.40 lbs
2450.0 g / 24.0 N
2 mm
25%
 4.90 kg / 10.80 lbs
4900.0 g / 48.1 N
3 mm
38%
 7.35 kg / 16.20 lbs
7350.0 g / 72.1 N
5 mm
63%
 12.25 kg / 27.01 lbs
12250.0 g / 120.2 N
10 mm
100%
 19.60 kg / 43.21 lbs
19600.0 g / 192.3 N
11 mm
100%
 19.60 kg / 43.21 lbs
19600.0 g / 192.3 N
12 mm
100%
 19.60 kg / 43.21 lbs
19600.0 g / 192.3 N
A too thin steel is incapable of focus the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the magnetism will penetrate right through and the holding will be smaller. To achieve full efficiency of this magnet's potential, you need a suitably thick backing of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the magnet works worse. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - power drop
MW 25x12 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.60 kg / 43.21 lbs
19600.0 g / 192.3 N
 OK
40 °C -2.2% 19.17 kg / 42.26 lbs
19168.8 g / 188.0 N
 OK
60 °C -4.4% 18.74 kg / 41.31 lbs
18737.6 g / 183.8 N
80 °C -6.6% 18.31 kg / 40.36 lbs
18306.4 g / 179.6 N
100 °C -28.8% 13.96 kg / 30.77 lbs
13955.2 g / 136.9 N
Standard neodymium magnets change their properties parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently destroy this product. With every degree above norm, the neodymium's force temporarily drops. Refrain from using this product near heat sources higher than its safe range. Too high temperature will lead to permanent loss of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization sooner than long magnets. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 55.71 kg / 122.82 lbs
5 494 Gs
8.36 kg / 18.42 lbs
8357 g / 82.0 N
 N/A
1 mm 51.78 kg / 114.14 lbs
8 273 Gs
7.77 kg / 17.12 lbs
7766 g / 76.2 N
 46.60 kg / 102.73 lbs
~0 Gs
2 mm 47.81 kg / 105.40 lbs
7 949 Gs
7.17 kg / 15.81 lbs
7172 g / 70.4 N
 43.03 kg / 94.86 lbs
~0 Gs
3 mm 43.94 kg / 96.88 lbs
7 621 Gs
6.59 kg / 14.53 lbs
6592 g / 64.7 N
 39.55 kg / 87.19 lbs
~0 Gs
5 mm 36.65 kg / 80.80 lbs
6 960 Gs
5.50 kg / 12.12 lbs
5497 g / 53.9 N
 32.98 kg / 72.72 lbs
~0 Gs
10 mm 21.94 kg / 48.36 lbs
5 385 Gs
3.29 kg / 7.25 lbs
3291 g / 32.3 N
 19.74 kg / 43.53 lbs
~0 Gs
20 mm 6.97 kg / 15.36 lbs
3 035 Gs
1.05 kg / 2.30 lbs
1045 g / 10.3 N
 6.27 kg / 13.83 lbs
~0 Gs
50 mm 0.33 kg / 0.72 lbs
657 Gs
0.05 kg / 0.11 lbs
49 g / 0.5 N
 0.29 kg / 0.65 lbs
~0 Gs
60 mm 0.15 kg / 0.32 lbs
439 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
70 mm 0.07 kg / 0.16 lbs
306 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.06 kg / 0.14 lbs
~0 Gs
80 mm 0.04 kg / 0.08 lbs
221 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
90 mm 0.02 kg / 0.05 lbs
165 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
100 mm 0.01 kg / 0.03 lbs
126 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of action. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still impressive.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Estimates demonstrate sliding force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
MW 25x12 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Timepiece 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Remote 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field poses a real danger to electronics and pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 25x12 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.62 km/h
(6.28 m/s)
 0.87 J
30 mm 23.99 km/h
(6.66 m/s)
 0.98 J
50 mm 24.03 km/h
(6.68 m/s)
 0.98 J
100 mm 24.04 km/h
(6.68 m/s)
 0.98 J
NdFeB products are delicate – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 25x12 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MW 25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 413 Mx 214.1 µWb
Pc Coefficient 0.57 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
MW 25x12 / N38

Environment Effective steel pull Effect
Air (land) 19.60 kg Standard
Water (riverbed) 22.44 kg
(+2.84 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.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Warning: On a vertical wall, the magnet retains just ~20% of its perpendicular strength.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.57

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

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%

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: 010502-2026
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The presented product is a very strong cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø25x12 mm, guarantees optimal power. The MW 25x12 / N38 component is characterized by an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 19.60 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 created for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 192.25 N with a weight of only 44.18 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. 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 frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø25x12), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø25x12 mm, which, at a weight of 44.18 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 19.60 kg (force ~192.25 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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. 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.

Advantages as well as disadvantages of rare earth magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They do not lose power, even over around 10 years – the drop in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by magnetic disturbances,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnetic induction on the surface of the magnet is impressive,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to freedom in shaping and the ability to modify to unusual requirements,
  • Huge importance in electronics industry – they find application in HDD drives, drive modules, advanced medical instruments, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited possibility of creating nuts in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Maximum magnetic pulling force – what affects it?

The load parameter shown concerns the maximum value, obtained under ideal test conditions, specifically:
  • on a base made of structural steel, optimally conducting the magnetic flux
  • with a cross-section minimum 10 mm
  • with an ground touching surface
  • without any air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by working environment parameters, mainly (from most important):
  • Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
Conscious usage

Use magnets with awareness. Their huge power can shock even experienced users. Be vigilant and respect their force.

Thermal limits

Control the heat. Heating the magnet to high heat will permanently weaken its properties and strength.

GPS and phone interference

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a smartphone to prevent damaging the sensors.

Health Danger

People with a ICD must keep an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.

Electronic devices

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Nickel coating and allergies

Certain individuals have a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling may cause a rash. We suggest use safety gloves.

Finger safety

Pinching hazard: The attraction force is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Mechanical processing

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

No play value

Absolutely keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

Risk of cracking

Watch out for shards. Magnets can fracture upon violent connection, launching shards into the air. Wear goggles.

Safety First! Want to know more? Read our article: Are neodymium magnets dangerous?