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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

technical details »

15.83 ZŁ with VAT / pcs + price for transport

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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
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 product - technical parameters

The following information represent the result of a physical analysis. Values were calculated on models for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Use these calculations as a reference point for designers.

Table 1: Static pull 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 LBS
5090.0 g / 49.9 N
 strong
1 mm 1103 Gs
110.3 mT
 4.91 kg / 10.82 LBS
4910.1 g / 48.2 N
 strong
2 mm 1075 Gs
107.5 mT
 4.66 kg / 10.28 LBS
4663.0 g / 45.7 N
 strong
3 mm 1040 Gs
104.0 mT
 4.36 kg / 9.62 LBS
4364.2 g / 42.8 N
 strong
5 mm 954 Gs
95.4 mT
 3.67 kg / 8.10 LBS
3673.1 g / 36.0 N
 strong
10 mm 703 Gs
70.3 mT
 2.00 kg / 4.40 LBS
1997.1 g / 19.6 N
 weak grip
15 mm 483 Gs
48.3 mT
 0.94 kg / 2.08 LBS
943.2 g / 9.3 N
 weak grip
20 mm 326 Gs
32.6 mT
 0.43 kg / 0.95 LBS
429.7 g / 4.2 N
 weak grip
30 mm 155 Gs
15.5 mT
 0.10 kg / 0.21 LBS
97.1 g / 1.0 N
 weak grip
50 mm 47 Gs
4.7 mT
 0.01 kg / 0.02 LBS
8.9 g / 0.1 N
 weak grip
Magnetic force drops significantly with every subsequent millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) strongly weakens the grip. Magnets work optimally during direct contact; gap weakens the force. See how quickly the load capacity fall, when the product does not touch flatly to the metal substrate. When calculating the arrangement, discard unnecessary gaps.

Table 2: Vertical capacity (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
The table below defines the estimated force sufficient to initiate the sliding of the magnet downwards on a upright metal surface (considering typical friction coefficient). This parameter is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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
When placing a magnet on a vertical surface (e.g., a fridge), it will only hold only approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient mean that holders slide down easier than they detach. Designing a vertical fastening? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a noticeably lighter cargo. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - 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
A too thin steel is not enough to take in the entire magnetic field, which squanders power of the magnet. If you install a neodymium to a weak sheet, the field will pass right through and the attraction force will be weaker. To achieve the maximum of this neodymium's power, you need a suitably thick piece of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel dimension based on the following data.

Table 5: Working in heat (material behavior) - 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
Standard neodymium magnets lose parameters above the temperature limit. Avoid high temperatures – excessive heat can irreversibly damage this product. As the temperature rises, the magnet's power briefly drops. Avoid using this product close to ovens higher than its safe range. Too high temperature will result in permanent loss of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - 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 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
Two magnetic products interact from a wider radius than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a larger range of action. Want to build a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*Field value between like poles drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Attention: Estimates refer to sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (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
Mechanical watch 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
A strong magnetic field is a real danger to IT equipment and medical implants. These magnets generate a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (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
Neodymium magnets are delicate – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when handling with large magnets.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Flux value passing through the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
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.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 material, 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.

Technical specification and ecology
Chemical composition
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
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This product is an extremely powerful cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø38x3.5 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 5.09 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening 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 stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability 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 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.
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 lifting capacity 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 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 as well as disadvantages of neodymium magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for around ten years – the drop is just ~1% (in theory),
  • They retain their magnetic properties even under close interference source,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnets have maximum magnetic induction on the working surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in shaping and the ability to modify to individual projects,
  • Key role in modern industrial fields – they find application in hard drives, electric drive systems, diagnostic systems, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose 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 stability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using a housing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets can disrupt the diagnostic process medical when they are in the body.
  • 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 it depends on?

The declared magnet strength refers to the limit force, recorded under laboratory conditions, namely:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Bear in mind that the application force may be lower depending on the following factors, in order of importance:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, 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 nominal value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Magnetic media

Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Dust is flammable

Dust produced during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Shattering risk

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets will cause them shattering into small pieces.

Bone fractures

Big blocks can smash fingers in a fraction of a second. Never place your hand between two strong magnets.

Medical implants

Patients with a heart stimulator should keep an large gap from magnets. The magnetism can interfere with the operation of the implant.

Respect the power

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Danger to the youngest

Adult use only. Small elements can be swallowed, causing serious injuries. Store away from children and animals.

Keep away from electronics

A strong magnetic field disrupts the functioning of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.

Skin irritation risks

Some people have a contact allergy to Ni, which is the typical protective layer for neodymium magnets. Extended handling may cause an allergic reaction. We strongly advise wear safety gloves.

Operating temperature

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?