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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

see technical 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

Physical modeling of the product - report

The following information constitute the direct effect of a mathematical analysis. Values are based on models for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - 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
 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
 safe
15 mm 483 Gs
48.3 mT
 0.94 kg / 2.08 LBS
943.2 g / 9.3 N
 safe
20 mm 326 Gs
32.6 mT
 0.43 kg / 0.95 LBS
429.7 g / 4.2 N
 safe
30 mm 155 Gs
15.5 mT
 0.10 kg / 0.21 LBS
97.1 g / 1.0 N
 safe
50 mm 47 Gs
4.7 mT
 0.01 kg / 0.02 LBS
8.9 g / 0.1 N
 safe
Pulling power weakens drastically with every mm of distance. Remember that even a very thin break (e.g., contamination, paint, dust) significantly diminishes the holding power. Neodymiums work optimally in perfect adhesion; gap weakens the force. See how flashily the load capacity plummet, when the magnet does not touch flatly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Slippage load (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
This section shows the estimated shear load necessary to start the slippage of the magnet vertically against a vertical steel plate (considering typical friction). This value is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (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 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 mounting a holder on a upright surface (e.g., a fridge), it will maintain barely approx. 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip mean that magnets slide down easier than they pop off the substrate. Planning a wall mount? Remember that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a noticeably lighter weight. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Material efficiency (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 is not enough to take in the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal resistance (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
Ordinary NdFeB products lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly destroy this product. With increasing heat, the magnet's power briefly lowers. Avoid using this magnet near heat sources higher than its working range. Exceeding the critical threshold will result in destruction of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (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
Two magnetic products attract each other from a much further distance than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a larger range of performance. Planning to create a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The levitation is slightly lower than the attraction, but still large.
*Field value in repulsion mode reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Estimates show shear force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni plating).

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
Powerful magnet radiation is a serious hazard to electronics as well as pacemakers. These magnets produce a field that destroys function of sensitive medical devices. Notice: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment 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
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during installation so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Surface protection spec
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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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. Essential parameter when building generators as well as sensors. Pc value 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%
Rust risk: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains just ~20% of its nominal pull.

2. Plate thickness effect

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

3. Power loss vs temp

*For N38 grade, 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

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.

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
Measurement Calculator
Force (pull)
Magnetic Induction
Enter a value into a field, to see the remaining units change on the fly.

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This product is a very strong cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø38x3.5 mm, guarantees maximum efficiency. The MW 38x3.5 / N38 model features an accuracy 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 in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, 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 low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen 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.
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 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.
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. 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 diametrically if your project requires it.

Strengths as well as weaknesses of rare earth magnets.

Pros

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
  • Magnets effectively defend themselves against demagnetization caused by ambient magnetic noise,
  • A magnet with a shiny silver surface has an effective appearance,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in constructing and the capacity to customize to unusual requirements,
  • Key role in future technologies – they are commonly used in mass storage devices, electric motors, medical equipment, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we recommend using casing - magnetic mechanism.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

The force parameter is a theoretical maximum value performed under standard conditions:
  • using a base made of mild steel, acting as a magnetic yoke
  • with a cross-section of at least 10 mm
  • with an ground touching surface
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction perpendicular to the plane
  • in stable room temperature

Determinants of practical lifting force of a magnet

Real force is influenced by specific conditions, including (from most important):
  • Distance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 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.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
Nickel allergy

Certain individuals suffer from a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Extended handling can result in dermatitis. We strongly advise wear protective gloves.

Product not for children

These products are not intended for children. Accidental ingestion of several magnets can lead to them attracting across intestines, which constitutes a severe health hazard and necessitates urgent medical intervention.

Pinching danger

Danger of trauma: The attraction force is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Machining danger

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Magnetic media

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Safe operation

Use magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and respect their power.

Heat sensitivity

Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

ICD Warning

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Beware of splinters

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

GPS Danger

Note: rare earth magnets generate a field that confuses precision electronics. Keep a separation from your mobile, device, and GPS.

Caution! Learn more about hazards in the article: Magnet Safety Guide.