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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

product specifications »

15.83 ZŁ with VAT / pcs + price for transport

12.87 ZŁ net + 23% VAT / pcs

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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 modeling of the magnet - data

The following data constitute the outcome of a physical analysis. Values are based on algorithms for the material Nd2Fe14B. Operational performance may differ. Use these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
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
 safe
15 mm 483 Gs
48.3 mT
 0.94 kg / 2.08 pounds
943.2 g / 9.3 N
 safe
20 mm 326 Gs
32.6 mT
 0.43 kg / 0.95 pounds
429.7 g / 4.2 N
 safe
30 mm 155 Gs
15.5 mT
 0.10 kg / 0.21 pounds
97.1 g / 1.0 N
 safe
50 mm 47 Gs
4.7 mT
 0.01 kg / 0.02 pounds
8.9 g / 0.1 N
 safe
Pulling power drops drastically with every mm of distance. Remember that even a microscopic distance (e.g., contamination, paint, dust) significantly weakens the grip. Magnetic products work strongest during direct contact; air break weakens the force. Analyze how flashily the pull force plummet, when the product does not touch directly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Shear hold (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 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
The following data defines the theoretical holding capacity needed to start the sliding of the magnet down against a vertical metal surface (assuming standard friction). This value varies with the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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
When mounting a magnet on a vertical surface (e.g., a board), it you can count on just about 20%-30% of nominal attraction strength. Gravitational force and a low friction coefficient cause that products slide down faster than they detach. Designing a vertical fastening? Consider that the sliding force is much weaker than the maximum static pull force. On a painted metal, the holder will give way down under a noticeably lighter load. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Material efficiency (saturation) - 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
A too thin steel is unable to focus the full magnetic flux, which weakens actual performance of the magnet. Should you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid backing of metal. The saturation phenomenon means that on delicate walls (e.g., car bodies), the magnet holds weaker. We suggest choosing the steel dimension from these parameters.

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
Ordinary NdFeB products change their properties parameters past the thermal threshold. Watch out for overheating – heat can permanently demagnetize this magnet. With every degree above norm, the neodymium's capacity briefly drops. Do not use this magnet close to ovens higher than its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 38x3.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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
Two magnets attract each other from a significantly greater distance than a neodymium and metal setup. The setup of two magnets produces a massive flux and a wider radius of operation. Want to build a powerful holder? Apply two magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the impact force is extreme. The repulsion force is marginally weaker than the attraction, but still significant.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Attention: Figures refer to friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (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
Mobile device 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
A strong magnetic field poses a serious hazard to electronic devices and medical implants. These NdFeB products generate a field that destroys function of sensitive medical devices. Be aware: the unseen radiation penetrates the body and housings. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - 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
NdFeB products are prone to chipping – a violent impact against metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when working with powerful specimens.

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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Construction 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)
Flux value passing through the magnet pole. Key data in coil applications and motors. Pc value determines the working geometry.

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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 grade, the critical 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.

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: 010062-2026
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The presented product is an exceptionally strong cylindrical magnet, composed of modern NdFeB material, which, with dimensions of Ø38x3.5 mm, guarantees the highest energy density. The MW 38x3.5 / N38 model boasts a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 5.09 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 standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created 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 rod is indispensable in miniature devices 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 immediate cracking of this professional component. To ensure stability in industry, specialized industrial adhesives 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 90% of applications in automation and machine building, where excessive 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 available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø38x3.5 mm, which, at a weight of 29.77 g, makes it an element with impressive magnetic energy density. 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 power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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. 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 through the diameter if your project requires it.

Advantages and disadvantages of rare earth magnets.

Advantages

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • Their strength is durable, and after around 10 years it drops only by ~1% (according to research),
  • Neodymium magnets are characterized by highly resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a shiny silver surface is more attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Due to the option of flexible forming and customization to unique needs, NdFeB magnets can be created in a wide range of shapes and sizes, which makes them more universal,
  • Wide application in modern industrial fields – they find application in hard drives, electric motors, medical equipment, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating nuts in the magnet and complex shapes - preferred is cover - magnet mounting.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Maximum holding power of the magnet – what affects it?

Breakaway force was defined for the most favorable conditions, including:
  • with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
  • whose thickness is min. 10 mm
  • with a surface free of scratches
  • without any air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Real force is influenced by working environment parameters, such as (from most important):
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate reduces the load capacity.

Warnings
Pinching danger

Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Health Danger

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

Fire warning

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Phone sensors

Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your phone, device, and navigation systems.

Electronic hazard

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

Do not underestimate power

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

Beware of splinters

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Swallowing risk

Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.

Metal Allergy

Studies show that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact or choose versions in plastic housing.

Attention! Learn more about risks in the article: Safety of working with magnets.