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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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Technical - 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 assembly - data

Presented values represent the result of a physical simulation. Results were calculated on models for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Treat these data as a reference point for designers.

Table 1: Static force (force vs distance) - power drop
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 lbs
5090.0 g / 49.9 N
medium risk
1 mm 1103 Gs
110.3 mT
4.91 kg / 10.82 lbs
4910.1 g / 48.2 N
medium risk
2 mm 1075 Gs
107.5 mT
4.66 kg / 10.28 lbs
4663.0 g / 45.7 N
medium risk
3 mm 1040 Gs
104.0 mT
4.36 kg / 9.62 lbs
4364.2 g / 42.8 N
medium risk
5 mm 954 Gs
95.4 mT
3.67 kg / 8.10 lbs
3673.1 g / 36.0 N
medium risk
10 mm 703 Gs
70.3 mT
2.00 kg / 4.40 lbs
1997.1 g / 19.6 N
low risk
15 mm 483 Gs
48.3 mT
0.94 kg / 2.08 lbs
943.2 g / 9.3 N
low risk
20 mm 326 Gs
32.6 mT
0.43 kg / 0.95 lbs
429.7 g / 4.2 N
low risk
30 mm 155 Gs
15.5 mT
0.10 kg / 0.21 lbs
97.1 g / 1.0 N
low risk
50 mm 47 Gs
4.7 mT
0.01 kg / 0.02 lbs
8.9 g / 0.1 N
low risk

Table 2: Slippage force (wall)
MW 38x3.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.98 kg / 2.16 lbs
982.0 g / 9.6 N
2 mm Stal (~0.2) 0.93 kg / 2.05 lbs
932.0 g / 9.1 N
3 mm Stal (~0.2) 0.87 kg / 1.92 lbs
872.0 g / 8.6 N
5 mm Stal (~0.2) 0.73 kg / 1.62 lbs
734.0 g / 7.2 N
10 mm Stal (~0.2) 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
15 mm Stal (~0.2) 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
20 mm Stal (~0.2) 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
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 lbs
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 lbs
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 lbs
2545.0 g / 25.0 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 38x3.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.51 kg / 1.12 lbs
509.0 g / 5.0 N
1 mm
25%
1.27 kg / 2.81 lbs
1272.5 g / 12.5 N
2 mm
50%
2.55 kg / 5.61 lbs
2545.0 g / 25.0 N
3 mm
75%
3.82 kg / 8.42 lbs
3817.5 g / 37.4 N
5 mm
100%
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
10 mm
100%
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
11 mm
100%
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
12 mm
100%
5.09 kg / 11.22 lbs
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 lbs
5090.0 g / 49.9 N
OK
40 °C -2.2% 4.98 kg / 10.97 lbs
4978.0 g / 48.8 N
OK
60 °C -4.4% 4.87 kg / 10.73 lbs
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 lbs
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 lbs
3624.1 g / 35.6 N

Table 6: Two magnets (attraction) - field collision
MW 38x3.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.82 kg / 19.44 lbs
2 143 Gs
1.32 kg / 2.92 lbs
1323 g / 13.0 N
N/A
1 mm 8.68 kg / 19.13 lbs
2 228 Gs
1.30 kg / 2.87 lbs
1302 g / 12.8 N
7.81 kg / 17.22 lbs
~0 Gs
2 mm 8.51 kg / 18.75 lbs
2 206 Gs
1.28 kg / 2.81 lbs
1276 g / 12.5 N
7.66 kg / 16.88 lbs
~0 Gs
3 mm 8.31 kg / 18.31 lbs
2 180 Gs
1.25 kg / 2.75 lbs
1246 g / 12.2 N
7.47 kg / 16.48 lbs
~0 Gs
5 mm 7.83 kg / 17.26 lbs
2 116 Gs
1.17 kg / 2.59 lbs
1174 g / 11.5 N
7.05 kg / 15.53 lbs
~0 Gs
10 mm 6.36 kg / 14.03 lbs
1 908 Gs
0.95 kg / 2.10 lbs
955 g / 9.4 N
5.73 kg / 12.63 lbs
~0 Gs
20 mm 3.46 kg / 7.63 lbs
1 407 Gs
0.52 kg / 1.14 lbs
519 g / 5.1 N
3.11 kg / 6.87 lbs
~0 Gs
50 mm 0.35 kg / 0.76 lbs
445 Gs
0.05 kg / 0.11 lbs
52 g / 0.5 N
0.31 kg / 0.69 lbs
~0 Gs
60 mm 0.17 kg / 0.37 lbs
310 Gs
0.03 kg / 0.06 lbs
25 g / 0.2 N
0.15 kg / 0.33 lbs
~0 Gs
70 mm 0.09 kg / 0.19 lbs
222 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
0.08 kg / 0.17 lbs
~0 Gs
80 mm 0.05 kg / 0.10 lbs
163 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
0.04 kg / 0.09 lbs
~0 Gs
90 mm 0.03 kg / 0.06 lbs
122 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
0.02 kg / 0.05 lbs
~0 Gs
100 mm 0.02 kg / 0.03 lbs
94 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
0.01 kg / 0.03 lbs
~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
Remote 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: Dynamics (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: Corrosion resistance
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: Electrical data (Pc)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

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

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Thermal stability

*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) = 0.14

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 and environmental data
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: 010062-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Other products

The offered product is a very strong rod magnet, manufactured from durable NdFeB material, which, at dimensions of Ø38x3.5 mm, guarantees the highest energy density. This specific item is characterized by an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 5.09 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 49.91 N with a weight of only 29.77 g, this rod is indispensable in miniature devices and wherever every gram matters.
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 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 an optimal price-to-power ratio and high resistance to demagnetization. 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 defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder 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 neodymium magnets.

Advantages

Apart from their superior power, neodymium magnets have these key benefits:
  • They do not lose power, even after around ten years – the drop in lifting capacity is only ~1% (based on measurements),
  • They have excellent resistance to magnetism drop as a result of external fields,
  • Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold, or silver gives an professional appearance,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, 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 form) even at a temperature of 230°C or more...
  • Possibility of individual machining as well as modifying to atypical applications,
  • Universal use in innovative solutions – they are utilized in mass storage devices, motor assemblies, advanced medical instruments, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Problematic aspects of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • 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
  • Limited possibility of making nuts in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these products can disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat affects it?

The declared magnet strength refers to the maximum value, measured under ideal test conditions, specifically:
  • on a block made of structural steel, effectively closing the magnetic flux
  • with a thickness minimum 10 mm
  • with a plane free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

Real force impacted by working environment parameters, mainly (from priority):
  • Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick sheet does not close the flux, causing part of the power to be escaped into the air.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate decreases the holding force.

Safety rules for work with neodymium magnets
Dust explosion hazard

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

Do not underestimate power

Be careful. Rare earth magnets attract from a long distance and snap with massive power, often quicker than you can move away.

Protect data

Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

Swallowing risk

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.

Finger safety

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Thermal limits

Keep cool. NdFeB magnets are susceptible to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Implant safety

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to handle the magnets.

Magnetic interference

Navigation devices and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Eye protection

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop handling magnets and use protective gear.

Warning! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98