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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 parameters »

15.83 ZŁ with VAT / pcs + price for transport

12.87 ZŁ net + 23% VAT / pcs

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Lifting power along with form of neodymium magnets can be reviewed on our our magnetic calculator.

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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 modeling of the magnet - data

The following values represent the outcome of a engineering calculation. Results rely on models for the material Nd2Fe14B. Actual performance might slightly differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - interaction chart
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
 warning
1 mm 1103 Gs
110.3 mT
 4.91 kg / 10.82 lbs
4910.1 g / 48.2 N
 warning
2 mm 1075 Gs
107.5 mT
 4.66 kg / 10.28 lbs
4663.0 g / 45.7 N
 warning
3 mm 1040 Gs
104.0 mT
 4.36 kg / 9.62 lbs
4364.2 g / 42.8 N
 warning
5 mm 954 Gs
95.4 mT
 3.67 kg / 8.10 lbs
3673.1 g / 36.0 N
 warning
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
Grip strength weakens sharply with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, varnish, veneer) strongly reduces the pull force. Magnets operate optimally during direct contact; gap nullifies the force. Analyze how rapidly the parameters plummet, when the product does not adhere flatly to the steel surface. When designing the mounting, discard redundant distances.

Table 2: Slippage 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 presents the approximate weight limit required to initiate the slippage of the magnet vertically against a upright steel plate (considering standard friction coefficient). This value varies with the separation distance between the magnet and the surface.

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 vertical plane (e.g., a fridge), it will only hold barely approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip mean that magnets slip easier than they detach. Designing a hanger? Note that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will slide down under a significantly smaller cargo. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - 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 sheet cannot absorb the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a too thin substrate, the flux will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (stability) - power drop
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
Classic neodymiums lose parameters above the temperature limit. Watch out for overheating – excessive heat can irreversibly destroy this product. As the temperature rises, the neodymium's force temporarily lowers. Avoid using this magnet near heat sources exceeding its working range. Too high temperature will result in permanent loss of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Warning indicator in the table signals 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 magnetic products interact from a much further distance than a neodymium and metal setup. The setup of two magnets creates a more powerful interaction and a larger range of operation. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is extreme. The levitation is slightly lower than the connection force, but still large.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Estimates demonstrate sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

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
Powerful magnet radiation poses a serious hazard to electronic devices and medical implants. These neodymiums generate a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (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
Neodymium magnets are prone to chipping – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when handling 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

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 emitted by the pole surface. Essential parameter when building generators and motors. The Pc coefficient determines the magnet's operating point.

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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds merely ~20% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Power loss vs temp

*For standard magnets, 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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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
Material specification
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
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The presented product is an exceptionally strong rod magnet, made from durable NdFeB material, which, at dimensions of Ø38x3.5 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and professional build quality, making it a perfect 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. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient filters, 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 electronics and wherever low weight is crucial.
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 automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need even stronger 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 store.
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 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. 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.

Pros and cons of Nd2Fe14B magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by external field sources,
  • Thanks to the reflective finish, the layer of nickel, gold, or silver-plated gives an professional appearance,
  • Magnetic induction on the top side of the magnet remains exceptional,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Due to the possibility of accurate molding and customization to custom needs, neodymium magnets can be created in a variety of geometric configurations, which makes them more universal,
  • Versatile presence in innovative solutions – they are utilized in data components, brushless drives, medical devices, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Cons of neodymium magnets and ways of using them
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Holding force of 5.09 kg is a measurement result performed under specific, ideal conditions:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a plane cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction vertical to the plane
  • in neutral thermal conditions

Key elements affecting lifting force

During everyday use, the actual holding force depends on a number of factors, presented from most significant:
  • Clearance – existence of foreign body (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
Cards and drives

Do not bring magnets close to a purse, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Safe operation

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Magnets are brittle

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Permanent damage

Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Crushing risk

Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.

Nickel coating and allergies

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

ICD Warning

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Flammability

Dust created during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Keep away from children

Absolutely store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are very dangerous.

Precision electronics

Navigation devices and smartphones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Important! Need more info? Read our article: Why are neodymium magnets dangerous?