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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 analysis of the magnet - data

These values constitute the result of a mathematical calculation. Results rely on algorithms for the material Nd2Fe14B. Real-world conditions may differ. Use these data as a reference point for designers.

Table 1: Static pull force (force vs gap) - characteristics
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
warning
20 mm 954 Gs
95.4 mT
2.47 kg / 5.45 pounds
2473.1 g / 24.3 N
warning
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 (wall)
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: Wall mounting (shearing) - 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) - power losses
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: Thermal stability (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: Two magnets (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: Safety (HSE) (electronics) - 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: Dynamics (kinetic energy) - 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: Surface protection spec
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: Construction data (Flux)
MW 38x15 / N38

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

Table 11: Hydrostatics and buoyancy
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.

2. Plate thickness effect

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

3. Temperature resistance

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

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

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

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.

Engineering data and GPSR
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%
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
Measurement Calculator
Pulling force

Field Strength

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The offered product is an exceptionally strong cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø38x15 mm, guarantees the highest energy density. The MW 38x15 / N38 component boasts high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 40.08 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 393.18 N with a weight of only 127.59 g, this rod 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., 38.1 mm) using epoxy glues. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability 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 store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 38 mm and height 15 mm. 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 external factors, 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. 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.

Pros and cons of rare earth magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by external disturbances,
  • In other words, due to the glossy finish of nickel, the element looks attractive,
  • Neodymium magnets generate maximum magnetic induction on a small area, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the potential of accurate forming and customization to unique solutions, neodymium magnets can be produced in a variety of shapes and sizes, which amplifies use scope,
  • Huge importance in modern technologies – they are commonly used in magnetic memories, electric motors, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating nuts in the magnet and complex shapes - recommended is cover - magnet mounting.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Magnetic strength at its maximum – what affects it?

The specified lifting capacity refers to the peak performance, measured under ideal test conditions, meaning:
  • using a plate made of low-carbon steel, serving as a magnetic yoke
  • with a cross-section of at least 10 mm
  • characterized by smoothness
  • with zero gap (no impurities)
  • during pulling in a direction vertical to the plane
  • at standard ambient temperature

Determinants of lifting force in real conditions

During everyday use, the actual lifting capacity depends on many variables, listed from the most important:
  • Clearance – existence of foreign body (rust, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate does not close the flux, causing part of the flux to be lost to the other side.
  • Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Pacemakers

For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Risk of cracking

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

Allergy Warning

Some people have a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Frequent touching may cause dermatitis. It is best to use protective gloves.

Choking Hazard

Adult use only. Small elements pose a choking risk, causing severe trauma. Store out of reach of kids and pets.

Keep away from electronics

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

Protect data

Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Operating temperature

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Physical harm

Danger of trauma: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.

Handling guide

Handle with care. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can react.

Flammability

Dust created during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98