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MW 38x3.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010062

GTIN/EAN: 5906301810612

5.00
Load capacity 5.09 kg / 49.91 N Magnetic Induction 112.31 mT / 1123 Gs
Diameter Ø
38 mm [±0,1 mm]
Height
3.5 mm [±0,1 mm]
Weight
29.77 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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Technical details - MW 38x3.5 / N38 - cylindrical magnet

Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010062
GTIN/EAN 5906301810612
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 3.5 mm [±0,1 mm]
Weight 29.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.09 kg / 49.91 N
Magnetic Induction ~ ? 112.31 mT / 1123 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 38x3.5 / 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

Technical modeling of the magnet - data

These values are the result of a engineering analysis. Results rely on algorithms for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide for designers.

Table 1: Static pull force (pull vs distance) - interaction chart
MW 38x3.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1123 Gs
112.3 mT
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
strong
1 mm 1103 Gs
110.3 mT
4.91 kg / 10.82 pounds
4910.1 g / 48.2 N
strong
2 mm 1075 Gs
107.5 mT
4.66 kg / 10.28 pounds
4663.0 g / 45.7 N
strong
3 mm 1040 Gs
104.0 mT
4.36 kg / 9.62 pounds
4364.2 g / 42.8 N
strong
5 mm 954 Gs
95.4 mT
3.67 kg / 8.10 pounds
3673.1 g / 36.0 N
strong
10 mm 703 Gs
70.3 mT
2.00 kg / 4.40 pounds
1997.1 g / 19.6 N
weak grip
15 mm 483 Gs
48.3 mT
0.94 kg / 2.08 pounds
943.2 g / 9.3 N
weak grip
20 mm 326 Gs
32.6 mT
0.43 kg / 0.95 pounds
429.7 g / 4.2 N
weak grip
30 mm 155 Gs
15.5 mT
0.10 kg / 0.21 pounds
97.1 g / 1.0 N
weak grip
50 mm 47 Gs
4.7 mT
0.01 kg / 0.02 pounds
8.9 g / 0.1 N
weak grip

Table 2: Slippage load (vertical surface)
MW 38x3.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.02 kg / 2.24 pounds
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.98 kg / 2.16 pounds
982.0 g / 9.6 N
2 mm Stal (~0.2) 0.93 kg / 2.05 pounds
932.0 g / 9.1 N
3 mm Stal (~0.2) 0.87 kg / 1.92 pounds
872.0 g / 8.6 N
5 mm Stal (~0.2) 0.73 kg / 1.62 pounds
734.0 g / 7.2 N
10 mm Stal (~0.2) 0.40 kg / 0.88 pounds
400.0 g / 3.9 N
15 mm Stal (~0.2) 0.19 kg / 0.41 pounds
188.0 g / 1.8 N
20 mm Stal (~0.2) 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 pounds
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MW 38x3.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.53 kg / 3.37 pounds
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 pounds
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 pounds
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 pounds
2545.0 g / 25.0 N

Table 4: Steel thickness (substrate influence) - power losses
MW 38x3.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.51 kg / 1.12 pounds
509.0 g / 5.0 N
1 mm
25%
1.27 kg / 2.81 pounds
1272.5 g / 12.5 N
2 mm
50%
2.55 kg / 5.61 pounds
2545.0 g / 25.0 N
3 mm
75%
3.82 kg / 8.42 pounds
3817.5 g / 37.4 N
5 mm
100%
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
10 mm
100%
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
11 mm
100%
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
12 mm
100%
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N

Table 5: Working in heat (stability) - thermal limit
MW 38x3.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
OK
40 °C -2.2% 4.98 kg / 10.97 pounds
4978.0 g / 48.8 N
OK
60 °C -4.4% 4.87 kg / 10.73 pounds
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 pounds
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 pounds
3624.1 g / 35.6 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 38x3.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.82 kg / 19.44 pounds
2 143 Gs
1.32 kg / 2.92 pounds
1323 g / 13.0 N
N/A
1 mm 8.68 kg / 19.13 pounds
2 228 Gs
1.30 kg / 2.87 pounds
1302 g / 12.8 N
7.81 kg / 17.22 pounds
~0 Gs
2 mm 8.51 kg / 18.75 pounds
2 206 Gs
1.28 kg / 2.81 pounds
1276 g / 12.5 N
7.66 kg / 16.88 pounds
~0 Gs
3 mm 8.31 kg / 18.31 pounds
2 180 Gs
1.25 kg / 2.75 pounds
1246 g / 12.2 N
7.47 kg / 16.48 pounds
~0 Gs
5 mm 7.83 kg / 17.26 pounds
2 116 Gs
1.17 kg / 2.59 pounds
1174 g / 11.5 N
7.05 kg / 15.53 pounds
~0 Gs
10 mm 6.36 kg / 14.03 pounds
1 908 Gs
0.95 kg / 2.10 pounds
955 g / 9.4 N
5.73 kg / 12.63 pounds
~0 Gs
20 mm 3.46 kg / 7.63 pounds
1 407 Gs
0.52 kg / 1.14 pounds
519 g / 5.1 N
3.11 kg / 6.87 pounds
~0 Gs
50 mm 0.35 kg / 0.76 pounds
445 Gs
0.05 kg / 0.11 pounds
52 g / 0.5 N
0.31 kg / 0.69 pounds
~0 Gs
60 mm 0.17 kg / 0.37 pounds
310 Gs
0.03 kg / 0.06 pounds
25 g / 0.2 N
0.15 kg / 0.33 pounds
~0 Gs
70 mm 0.09 kg / 0.19 pounds
222 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.17 pounds
~0 Gs
80 mm 0.05 kg / 0.10 pounds
163 Gs
0.01 kg / 0.02 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
90 mm 0.03 kg / 0.06 pounds
122 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
100 mm 0.02 kg / 0.03 pounds
94 Gs
0.00 kg / 0.01 pounds
2 g / 0.0 N
0.01 kg / 0.03 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MW 38x3.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Timepiece 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 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 (kinetic energy) - warning
MW 38x3.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.62 km/h
(4.90 m/s)
0.36 J
30 mm 20.44 km/h
(5.68 m/s)
0.48 J
50 mm 20.58 km/h
(5.72 m/s)
0.49 J
100 mm 20.60 km/h
(5.72 m/s)
0.49 J

Table 9: Anti-corrosion coating durability
MW 38x3.5 / 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 38x3.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 022 Mx 170.2 µWb
Pc Coefficient 0.14 Low (Flat)

Table 11: Physics of underwater searching
MW 38x3.5 / N38

Environment Effective steel pull Effect
Air (land) 5.09 kg Standard
Water (riverbed) 5.83 kg
(+0.74 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)

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14

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: 010062-2026
Quick Unit Converter

Pulling force


Field Strength

See also products

The offered product is an exceptionally strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø38x3.5 mm, guarantees maximum efficiency. This specific item features an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 5.09 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 49.91 N with a weight of only 29.77 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in industry, 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 suitable for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø38x3.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø38x3.5 mm, which, at a weight of 29.77 g, makes it an element with high magnetic energy density. The value of 49.91 N means that the magnet is capable of holding a weight many times exceeding its own mass of 29.77 g. 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 38 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 diametrically if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after around ten years it drops only by ~1% (theoretically),
  • They maintain their magnetic properties even under close interference source,
  • In other words, due to the aesthetic surface of gold, the element becomes visually attractive,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which increases force concentration,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in designing and the ability to customize to complex applications,
  • Key role in innovative solutions – they find application in mass storage devices, electromotive mechanisms, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 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 stable to moisture, in case of application outdoors
  • We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

The declared magnet strength concerns the limit force, measured under ideal test conditions, namely:
  • using a base made of mild steel, serving as a circuit closing element
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane free of scratches
  • with direct contact (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

Please note that the magnet holding may be lower subject to elements below, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

Safe handling of neodymium magnets
Safe distance

Do not bring magnets close to a purse, computer, or TV. The magnetism can destroy these devices and wipe information from cards.

Immense force

Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.

Skin irritation risks

Medical facts indicate that nickel (the usual finish) is a common allergen. If your skin reacts to metals, avoid direct skin contact and opt for encased magnets.

Dust explosion hazard

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Precision electronics

A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.

Magnet fragility

Protect your eyes. Magnets can fracture upon violent connection, ejecting shards into the air. Wear goggles.

Medical interference

Patients with a ICD must maintain an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Bone fractures

Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Maximum temperature

Keep cool. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

This is not a toy

Neodymium magnets are not toys. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which poses a direct threat to life and requires immediate surgery.

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