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MW 38x3.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010062

GTIN/EAN: 5906301810612

5.00

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

15.83 with VAT / pcs + price for transport

12.87 ZŁ net + 23% VAT / pcs

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Parameters and structure of neodymium magnets can be reviewed on our our magnetic calculator.

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Technical of the product - 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
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 - data

The following information constitute the outcome of a physical calculation. Results rely on models for the class Nd2Fe14B. Actual performance might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

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

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

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

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

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

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

Table 4: Material efficiency (saturation) - power losses
MW 38x3.5 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.51 kg / 509.0 g
5.0 N
1 mm
25%
1.27 kg / 1272.5 g
12.5 N
2 mm
50%
2.55 kg / 2545.0 g
25.0 N
5 mm
100%
5.09 kg / 5090.0 g
49.9 N
10 mm
100%
5.09 kg / 5090.0 g
49.9 N

Table 5: Thermal resistance (stability) - resistance threshold
MW 38x3.5 / N38

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

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

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 8.82 kg / 8818 g
86.5 N
2 143 Gs
N/A
1 mm 8.68 kg / 8679 g
85.1 N
2 228 Gs
7.81 kg / 7811 g
76.6 N
~0 Gs
2 mm 8.51 kg / 8507 g
83.5 N
2 206 Gs
7.66 kg / 7656 g
75.1 N
~0 Gs
3 mm 8.31 kg / 8306 g
81.5 N
2 180 Gs
7.47 kg / 7475 g
73.3 N
~0 Gs
5 mm 7.83 kg / 7829 g
76.8 N
2 116 Gs
7.05 kg / 7046 g
69.1 N
~0 Gs
10 mm 6.36 kg / 6364 g
62.4 N
1 908 Gs
5.73 kg / 5727 g
56.2 N
~0 Gs
20 mm 3.46 kg / 3460 g
33.9 N
1 407 Gs
3.11 kg / 3114 g
30.5 N
~0 Gs
50 mm 0.35 kg / 346 g
3.4 N
445 Gs
0.31 kg / 312 g
3.1 N
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
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: Impact energy (kinetic energy) - collision effects
MW 38x3.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.10 km/h
(4.47 m/s)
0.30 J
30 mm 23.11 km/h
(6.42 m/s)
0.61 J
50 mm 29.52 km/h
(8.20 m/s)
1.00 J
100 mm 41.70 km/h
(11.58 m/s)
2.00 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: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*For N38 material, the max working temp 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.

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%
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: 010062-2025
Magnet Unit Converter
Pulling force

Magnetic Field

See also products

This product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø38x3.5 mm, guarantees maximum efficiency. The MW 38x3.5 / N38 component boasts 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 impressive force (approx. 5.09 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, 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 positioning or actuating element. Thanks to the pull force 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, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest 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.
The presented product is a neodymium magnet with precisely defined parameters: diameter 38 mm and height 3.5 mm. The key parameter here is the holding force amounting to approximately 5.09 kg (force ~49.91 N), which, with such compact dimensions, proves the high power of the NdFeB material. 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 3.5 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 rare earth magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after around 10 years it drops only by ~1% (according to research),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the working layer of the magnet remains maximum,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in shaping and the capacity to customize to client solutions,
  • Universal use in innovative solutions – they are commonly used in HDD drives, electric motors, precision medical tools, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Disadvantages

Characteristics of disadvantages of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend 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 making threads in the magnet and complicated shapes - preferred is casing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum magnetic pulling forcewhat contributes to it?

The declared magnet strength concerns the maximum value, recorded under ideal test conditions, namely:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an polished contact surface
  • with total lack of distance (no impurities)
  • during pulling in a direction perpendicular to the plane
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

Effective lifting capacity is influenced by working environment parameters, mainly (from most important):
  • Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Demagnetization risk

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Eye protection

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

Medical implants

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Hand protection

Large magnets can crush fingers instantly. Do not put your hand between two strong magnets.

Magnetic interference

GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Caution required

Exercise caution. Neodymium magnets attract from a long distance and snap with huge force, often quicker than you can move away.

Warning for allergy sufferers

It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands or choose versions in plastic housing.

Keep away from children

NdFeB magnets are not suitable for play. Accidental ingestion of several magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.

Flammability

Powder created during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Cards and drives

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Stay away of min. 10 cm.

Caution! 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