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MW 38x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010061

GTIN/EAN: 5906301810605

Diameter Ø

38 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

127.59 g

Magnetization Direction

↑ axial

Load capacity

40.08 kg / 393.18 N

Magnetic Induction

384.07 mT / 3841 Gs

Coating

[NiCuNi] Nickel

70.00 with VAT / pcs + price for transport

56.91 ZŁ net + 23% VAT / pcs

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Product card - MW 38x15 / N38 - cylindrical magnet

Specification / characteristics - MW 38x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010061
GTIN/EAN 5906301810605
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 38 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 127.59 g
Magnetization Direction ↑ axial
Load capacity ~ ? 40.08 kg / 393.18 N
Magnetic Induction ~ ? 384.07 mT / 3841 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 38x15 / 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

Technical simulation of the magnet - report

The following data constitute the outcome of a mathematical calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters may deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static force (force vs distance) - interaction chart
MW 38x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3840 Gs
384.0 mT
40.08 kg / 88.36 pounds
40080.0 g / 393.2 N
critical level
1 mm 3668 Gs
366.8 mT
36.56 kg / 80.61 pounds
36563.4 g / 358.7 N
critical level
2 mm 3485 Gs
348.5 mT
33.01 kg / 72.78 pounds
33011.6 g / 323.8 N
critical level
3 mm 3297 Gs
329.7 mT
29.55 kg / 65.14 pounds
29545.5 g / 289.8 N
critical level
5 mm 2917 Gs
291.7 mT
23.13 kg / 50.99 pounds
23128.9 g / 226.9 N
critical level
10 mm 2049 Gs
204.9 mT
11.41 kg / 25.15 pounds
11406.3 g / 111.9 N
critical level
15 mm 1396 Gs
139.6 mT
5.30 kg / 11.68 pounds
5297.4 g / 52.0 N
medium risk
20 mm 954 Gs
95.4 mT
2.47 kg / 5.45 pounds
2473.1 g / 24.3 N
medium risk
30 mm 474 Gs
47.4 mT
0.61 kg / 1.35 pounds
610.3 g / 6.0 N
low risk
50 mm 155 Gs
15.5 mT
0.07 kg / 0.14 pounds
65.6 g / 0.6 N
low risk

Table 2: Shear capacity (vertical surface)
MW 38x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.02 kg / 17.67 pounds
8016.0 g / 78.6 N
1 mm Stal (~0.2) 7.31 kg / 16.12 pounds
7312.0 g / 71.7 N
2 mm Stal (~0.2) 6.60 kg / 14.55 pounds
6602.0 g / 64.8 N
3 mm Stal (~0.2) 5.91 kg / 13.03 pounds
5910.0 g / 58.0 N
5 mm Stal (~0.2) 4.63 kg / 10.20 pounds
4626.0 g / 45.4 N
10 mm Stal (~0.2) 2.28 kg / 5.03 pounds
2282.0 g / 22.4 N
15 mm Stal (~0.2) 1.06 kg / 2.34 pounds
1060.0 g / 10.4 N
20 mm Stal (~0.2) 0.49 kg / 1.09 pounds
494.0 g / 4.8 N
30 mm Stal (~0.2) 0.12 kg / 0.27 pounds
122.0 g / 1.2 N
50 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N

Table 3: Vertical assembly (sliding) - vertical pull
MW 38x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.02 kg / 26.51 pounds
12024.0 g / 118.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.02 kg / 17.67 pounds
8016.0 g / 78.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.01 kg / 8.84 pounds
4008.0 g / 39.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
20.04 kg / 44.18 pounds
20040.0 g / 196.6 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 38x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.00 kg / 4.42 pounds
2004.0 g / 19.7 N
1 mm
13%
5.01 kg / 11.05 pounds
5010.0 g / 49.1 N
2 mm
25%
10.02 kg / 22.09 pounds
10020.0 g / 98.3 N
3 mm
38%
15.03 kg / 33.14 pounds
15030.0 g / 147.4 N
5 mm
63%
25.05 kg / 55.23 pounds
25050.0 g / 245.7 N
10 mm
100%
40.08 kg / 88.36 pounds
40080.0 g / 393.2 N
11 mm
100%
40.08 kg / 88.36 pounds
40080.0 g / 393.2 N
12 mm
100%
40.08 kg / 88.36 pounds
40080.0 g / 393.2 N

Table 5: Working in heat (stability) - resistance threshold
MW 38x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 40.08 kg / 88.36 pounds
40080.0 g / 393.2 N
OK
40 °C -2.2% 39.20 kg / 86.42 pounds
39198.2 g / 384.5 N
OK
60 °C -4.4% 38.32 kg / 84.47 pounds
38316.5 g / 375.9 N
80 °C -6.6% 37.43 kg / 82.53 pounds
37434.7 g / 367.2 N
100 °C -28.8% 28.54 kg / 62.91 pounds
28537.0 g / 279.9 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 38x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 103.10 kg / 227.31 pounds
5 235 Gs
15.47 kg / 34.10 pounds
15466 g / 151.7 N
N/A
1 mm 98.64 kg / 217.47 pounds
7 512 Gs
14.80 kg / 32.62 pounds
14796 g / 145.2 N
88.78 kg / 195.72 pounds
~0 Gs
2 mm 94.06 kg / 207.36 pounds
7 336 Gs
14.11 kg / 31.10 pounds
14109 g / 138.4 N
84.65 kg / 186.63 pounds
~0 Gs
3 mm 89.48 kg / 197.26 pounds
7 155 Gs
13.42 kg / 29.59 pounds
13421 g / 131.7 N
80.53 kg / 177.53 pounds
~0 Gs
5 mm 80.42 kg / 177.30 pounds
6 783 Gs
12.06 kg / 26.60 pounds
12064 g / 118.3 N
72.38 kg / 159.57 pounds
~0 Gs
10 mm 59.50 kg / 131.17 pounds
5 834 Gs
8.92 kg / 19.68 pounds
8925 g / 87.6 N
53.55 kg / 118.05 pounds
~0 Gs
20 mm 29.34 kg / 64.69 pounds
4 097 Gs
4.40 kg / 9.70 pounds
4401 g / 43.2 N
26.41 kg / 58.22 pounds
~0 Gs
50 mm 3.08 kg / 6.80 pounds
1 328 Gs
0.46 kg / 1.02 pounds
463 g / 4.5 N
2.78 kg / 6.12 pounds
~0 Gs
60 mm 1.57 kg / 3.46 pounds
948 Gs
0.24 kg / 0.52 pounds
236 g / 2.3 N
1.41 kg / 3.12 pounds
~0 Gs
70 mm 0.84 kg / 1.85 pounds
694 Gs
0.13 kg / 0.28 pounds
126 g / 1.2 N
0.76 kg / 1.67 pounds
~0 Gs
80 mm 0.47 kg / 1.04 pounds
520 Gs
0.07 kg / 0.16 pounds
71 g / 0.7 N
0.42 kg / 0.94 pounds
~0 Gs
90 mm 0.28 kg / 0.61 pounds
398 Gs
0.04 kg / 0.09 pounds
42 g / 0.4 N
0.25 kg / 0.55 pounds
~0 Gs
100 mm 0.17 kg / 0.37 pounds
311 Gs
0.03 kg / 0.06 pounds
25 g / 0.2 N
0.15 kg / 0.33 pounds
~0 Gs

Table 7: Hazards (implants) - warnings
MW 38x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 18.5 cm
Hearing aid 10 Gs (1.0 mT) 14.5 cm
Mechanical watch 20 Gs (2.0 mT) 11.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Car key 50 Gs (5.0 mT) 8.0 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Impact energy (cracking risk) - collision effects
MW 38x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.81 km/h
(5.78 m/s)
2.13 J
30 mm 31.25 km/h
(8.68 m/s)
4.81 J
50 mm 40.01 km/h
(11.11 m/s)
7.88 J
100 mm 56.53 km/h
(15.70 m/s)
15.73 J

Table 9: Corrosion resistance
MW 38x15 / 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 38x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 45 065 Mx 450.7 µWb
Pc Coefficient 0.50 Low (Flat)

Table 11: Underwater work (magnet fishing)
MW 38x15 / N38

Environment Effective steel pull Effect
Air (land) 40.08 kg Standard
Water (riverbed) 45.89 kg
(+5.81 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Caution: On a vertical wall, the magnet holds merely ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.50

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
Chemical composition
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%
Sustainability
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: 010061-2026
Quick Unit Converter
Magnet pull force

Magnetic Induction

Other offers

The presented product is an extremely powerful rod magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø38x15 mm, guarantees the highest energy density. The MW 38x15 / N38 model is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 40.08 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing 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 pull force of 393.18 N with a weight of only 127.59 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
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., 38.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø38x15), 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 Ø38x15 mm, which, at a weight of 127.59 g, makes it an element with high magnetic energy density. The value of 393.18 N means that the magnet is capable of holding a weight many times exceeding its own mass of 127.59 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 15 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even over nearly 10 years – the decrease in strength is only ~1% (based on measurements),
  • They do not lose their magnetic properties even under close interference source,
  • A magnet with a smooth gold surface has better aesthetics,
  • Magnetic induction on the working layer of the magnet remains very high,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to modularity in constructing and the ability to adapt to unusual requirements,
  • Key role in future technologies – they are commonly used in magnetic memories, electromotive mechanisms, diagnostic systems, as well as modern systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat it depends on?

Breakaway force was determined for the most favorable conditions, assuming:
  • on a base made of structural steel, perfectly concentrating the magnetic flux
  • with a thickness of at least 10 mm
  • with an polished touching surface
  • with total lack of distance (no impurities)
  • during pulling in a direction vertical to the plane
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

Bear in mind that the application force will differ depending on elements below, starting with the most relevant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Warnings
Allergic reactions

Some people experience a hypersensitivity to Ni, which is the common plating for neodymium magnets. Extended handling may cause an allergic reaction. We recommend use protective gloves.

Warning for heart patients

For implant holders: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to handle the magnets.

Pinching danger

Big blocks can smash fingers instantly. Do not place your hand between two attracting surfaces.

Handling rules

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Magnet fragility

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets leads to them shattering into shards.

Flammability

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Do not give to children

Strictly store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are tragic.

Do not overheat magnets

Do not overheat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Protect data

Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

Keep away from electronics

A strong magnetic field interferes with the operation of magnetometers in phones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.

Danger! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98