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MW 25x6 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010050

GTIN/EAN: 5906301810490

5.00
Load capacity 10.27 kg / 100.71 N Magnetic Induction 268.21 mT / 2682 Gs
Diameter Ø
25 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
22.09 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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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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Physical properties - MW 25x6 / N38 - cylindrical magnet

Specification / characteristics - MW 25x6 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010050
GTIN/EAN 5906301810490
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 6 mm [±0,1 mm]
Weight 22.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.27 kg / 100.71 N
Magnetic Induction ~ ? 268.21 mT / 2682 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x6 / N38 - cylindrical magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 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

Physical analysis of the magnet - data

These values constitute the outcome of a physical calculation. Values rely on algorithms for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these calculations as a reference point for designers.

Table 1: Static pull force (force vs distance) - power drop
MW 25x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2682 Gs
268.2 mT
10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
crushing
1 mm 2535 Gs
253.5 mT
9.18 kg / 20.23 lbs
9177.2 g / 90.0 N
medium risk
2 mm 2363 Gs
236.3 mT
7.97 kg / 17.57 lbs
7971.8 g / 78.2 N
medium risk
3 mm 2176 Gs
217.6 mT
6.76 kg / 14.91 lbs
6761.0 g / 66.3 N
medium risk
5 mm 1793 Gs
179.3 mT
4.59 kg / 10.13 lbs
4592.7 g / 45.1 N
medium risk
10 mm 1013 Gs
101.3 mT
1.46 kg / 3.23 lbs
1464.5 g / 14.4 N
low risk
15 mm 565 Gs
56.5 mT
0.46 kg / 1.00 lbs
455.3 g / 4.5 N
low risk
20 mm 330 Gs
33.0 mT
0.16 kg / 0.34 lbs
155.7 g / 1.5 N
low risk
30 mm 134 Gs
13.4 mT
0.03 kg / 0.06 lbs
25.6 g / 0.3 N
low risk
50 mm 36 Gs
3.6 mT
0.00 kg / 0.00 lbs
1.9 g / 0.0 N
low risk

Table 2: Shear capacity (wall)
MW 25x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.05 kg / 4.53 lbs
2054.0 g / 20.1 N
1 mm Stal (~0.2) 1.84 kg / 4.05 lbs
1836.0 g / 18.0 N
2 mm Stal (~0.2) 1.59 kg / 3.51 lbs
1594.0 g / 15.6 N
3 mm Stal (~0.2) 1.35 kg / 2.98 lbs
1352.0 g / 13.3 N
5 mm Stal (~0.2) 0.92 kg / 2.02 lbs
918.0 g / 9.0 N
10 mm Stal (~0.2) 0.29 kg / 0.64 lbs
292.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 lbs
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 lbs
32.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (sliding) - vertical pull
MW 25x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.08 kg / 6.79 lbs
3081.0 g / 30.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.05 kg / 4.53 lbs
2054.0 g / 20.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.03 kg / 2.26 lbs
1027.0 g / 10.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.14 kg / 11.32 lbs
5135.0 g / 50.4 N

Table 4: Steel thickness (saturation) - power losses
MW 25x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.51 kg / 1.13 lbs
513.5 g / 5.0 N
1 mm
13%
1.28 kg / 2.83 lbs
1283.8 g / 12.6 N
2 mm
25%
2.57 kg / 5.66 lbs
2567.5 g / 25.2 N
3 mm
38%
3.85 kg / 8.49 lbs
3851.3 g / 37.8 N
5 mm
63%
6.42 kg / 14.15 lbs
6418.7 g / 63.0 N
10 mm
100%
10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
11 mm
100%
10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
12 mm
100%
10.27 kg / 22.64 lbs
10270.0 g / 100.7 N

Table 5: Thermal resistance (material behavior) - thermal limit
MW 25x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
OK
40 °C -2.2% 10.04 kg / 22.14 lbs
10044.1 g / 98.5 N
OK
60 °C -4.4% 9.82 kg / 21.65 lbs
9818.1 g / 96.3 N
80 °C -6.6% 9.59 kg / 21.15 lbs
9592.2 g / 94.1 N
100 °C -28.8% 7.31 kg / 16.12 lbs
7312.2 g / 71.7 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 25x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.76 kg / 47.98 lbs
4 291 Gs
3.26 kg / 7.20 lbs
3264 g / 32.0 N
N/A
1 mm 20.66 kg / 45.54 lbs
5 225 Gs
3.10 kg / 6.83 lbs
3098 g / 30.4 N
18.59 kg / 40.98 lbs
~0 Gs
2 mm 19.45 kg / 42.87 lbs
5 070 Gs
2.92 kg / 6.43 lbs
2917 g / 28.6 N
17.50 kg / 38.58 lbs
~0 Gs
3 mm 18.18 kg / 40.09 lbs
4 902 Gs
2.73 kg / 6.01 lbs
2727 g / 26.8 N
16.36 kg / 36.08 lbs
~0 Gs
5 mm 15.60 kg / 34.39 lbs
4 541 Gs
2.34 kg / 5.16 lbs
2340 g / 23.0 N
14.04 kg / 30.95 lbs
~0 Gs
10 mm 9.73 kg / 21.46 lbs
3 587 Gs
1.46 kg / 3.22 lbs
1460 g / 14.3 N
8.76 kg / 19.31 lbs
~0 Gs
20 mm 3.10 kg / 6.84 lbs
2 025 Gs
0.47 kg / 1.03 lbs
465 g / 4.6 N
2.79 kg / 6.16 lbs
~0 Gs
50 mm 0.13 kg / 0.28 lbs
409 Gs
0.02 kg / 0.04 lbs
19 g / 0.2 N
0.11 kg / 0.25 lbs
~0 Gs
60 mm 0.05 kg / 0.12 lbs
268 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.11 lbs
~0 Gs
70 mm 0.03 kg / 0.06 lbs
183 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
0.02 kg / 0.05 lbs
~0 Gs
80 mm 0.01 kg / 0.03 lbs
131 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.03 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
96 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
72 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MW 25x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Mechanical watch 20 Gs (2.0 mT) 6.5 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: Impact energy (cracking risk) - warning
MW 25x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.18 km/h
(6.72 m/s)
0.50 J
30 mm 25.66 km/h
(7.13 m/s)
0.56 J
50 mm 25.69 km/h
(7.14 m/s)
0.56 J
100 mm 25.70 km/h
(7.14 m/s)
0.56 J

Table 9: Anti-corrosion coating durability
MW 25x6 / 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: Electrical data (Pc)
MW 25x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 740 Mx 147.4 µWb
Pc Coefficient 0.34 Low (Flat)

Table 11: Physics of underwater searching
MW 25x6 / N38

Environment Effective steel pull Effect
Air (land) 10.27 kg Standard
Water (riverbed) 11.76 kg
(+1.49 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Sliding resistance

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

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Thermal stability

*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) = 0.34

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

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: 010050-2026
Measurement Calculator

Pulling force


Magnetic Induction

Check out more offers

The presented product is an incredibly powerful cylinder magnet, made from modern NdFeB material, which, at dimensions of Ø25x6 mm, guarantees optimal power. The MW 25x6 / N38 model features high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 10.27 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 100.71 N with a weight of only 22.09 g, this cylindrical magnet 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, 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 a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø25x6), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 25 mm and height 6 mm. The value of 100.71 N means that the magnet is capable of holding a weight many times exceeding its own mass of 22.09 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 6 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 diametrically if your project requires it.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external field sources,
  • In other words, due to the glossy layer of nickel, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
  • 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 detailed forming and modifying to individual applications,
  • Significant place in innovative solutions – they are commonly used in magnetic memories, electric motors, medical equipment, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in small systems

Disadvantages

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making threads in the magnet and complex shapes - recommended is cover - mounting mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum holding power of the magnet – what affects it?

The load parameter shown concerns the limit force, recorded under ideal test conditions, meaning:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • with total lack of distance (without impurities)
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Bear in mind that the working load will differ depending on the following factors, starting with the most relevant:
  • Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets
Adults only

Adult use only. Small elements can be swallowed, leading to intestinal necrosis. Keep out of reach of kids and pets.

Impact on smartphones

A strong magnetic field interferes with the functioning of compasses in phones and GPS navigation. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Caution required

Use magnets consciously. Their huge power can surprise even experienced users. Plan your moves and respect their power.

Medical implants

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Do not drill into magnets

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Do not overheat magnets

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Shattering risk

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Data carriers

Very strong magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Avoid contact if allergic

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease handling magnets and wear gloves.

Crushing force

Large magnets can crush fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Attention! Need more info? Read our article: Are neodymium magnets dangerous?