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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

view properties »

15.83 ZŁ with VAT / pcs + price for transport

12.87 ZŁ net + 23% VAT / pcs

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Technical parameters - 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

Physical analysis of the assembly - technical parameters

Presented values are the result of a engineering analysis. Results are based on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull 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
 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
Pulling power weakens drastically with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., contamination, paint, dust) strongly weakens the grip. Magnets work strongest at the point of direct contact; gap kills the force. Analyze how flashily the pull force fall, when the product does not touch flatly to the metal substrate. When planning the mounting, discard redundant distances.

Table 2: Sliding 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 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 calculates the approximate weight limit required to initiate the shifting of the magnet down against a upright metal surface (assuming typical friction coefficient). This value depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (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 hanging a element on a upright surface (e.g., a board), it will maintain just approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that holders slide down faster than they pop off the substrate. Planning a vertical fastening? Note that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slide down under a noticeably lighter load. Application of an anti-slip pad can significantly improve the result.

Table 4: Steel thickness (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 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 thin metal plate cannot absorb the full magnetic flux, which weakens actual performance of the magnet. If you install a neodymium to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To utilize full efficiency of this magnet's power, you require a sufficiently solid piece of metal. The material oversaturation means that on delicate walls (e.g., car bodies), the holder works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - resistance threshold
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 after exceeding the maximum temperature. Protect against heat – heat can irreversibly destroy this product. As the temperature rises, the magnet's power momentarily lowers. Refrain from using this magnet close to heaters higher than its working range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table indicates permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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
Two strong neodymiums attract each other from a much further distance than a neodymium and metal setup. The connection of magnet-to-magnet produces a massive flux and a larger range of action. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Be careful that when connecting a pair of magnets, the collision energy is extreme. The levitation is slightly lower than the connection force, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (due to field cancellation).
Important: Results apply to sliding force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
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 large risk to IT equipment and medical implants. These magnets generate a flux that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
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
Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the magnet. Wear eye protection when working with powerful specimens.

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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Total magnetic flux passing through the pole surface. Key data when building generators as well as sensors. Pc value determines the magnet's operating point.

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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Shear force

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

2. Plate thickness effect

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

3. Thermal stability

*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.

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%
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
Quick Unit Converter
Pulling force
Field Strength
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This product is an exceptionally strong rod magnet, made from advanced NdFeB material, which, with dimensions of Ø38x3.5 mm, guarantees optimal power. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 5.09 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, 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 rod is indispensable in miniature devices 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 professional component. To ensure stability 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 suitable for the majority 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.
The presented product is a neodymium magnet with precisely defined parameters: diameter 38 mm and height 3.5 mm. 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 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. 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 through the diameter if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Besides their immense strength, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • In other words, due to the metallic layer of nickel, the element gains a professional look,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual forming and adapting to complex needs,
  • Wide application in innovative solutions – they serve a role in hard drives, brushless drives, medical equipment, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in miniature devices

Limitations

Problematic aspects of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum holding power of the magnet – what affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • on a base made of mild steel, effectively closing the magnetic field
  • with a thickness minimum 10 mm
  • with a surface perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

What influences lifting capacity in practice

Holding efficiency is influenced by working environment parameters, such as (from priority):
  • Clearance – the presence of any layer (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, 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’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Health Danger

Individuals with a ICD must keep an absolute distance from magnets. The magnetism can stop the functioning of the implant.

Flammability

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

Electronic devices

Do not bring magnets close to a purse, laptop, or TV. The magnetism can permanently damage these devices and erase data from cards.

Magnetic interference

A powerful magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Keep magnets near a device to prevent damaging the sensors.

Bodily injuries

Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Fragile material

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Metal Allergy

Studies show that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact and choose encased magnets.

Swallowing risk

These products are not intended for children. Eating multiple magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

Handling guide

Handle magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their power.

Heat warning

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. Damage is permanent.

Attention! More info about risks in the article: Magnet Safety Guide.