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MW 19x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010038

GTIN/EAN: 5906301810377

Diameter Ø

19 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

8.51 g

Magnetization Direction

↑ axial

Load capacity

4.96 kg / 48.62 N

Magnetic Induction

240.51 mT / 2405 Gs

Coating

[Zn] Zinc

check technical specifications »

4.80 ZŁ with VAT / pcs + price for transport

3.90 ZŁ net + 23% VAT / pcs

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Technical data - MW 19x4 / N38 - cylindrical magnet

Specification / characteristics - MW 19x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010038
GTIN/EAN 5906301810377
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 19 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 8.51 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.96 kg / 48.62 N
Magnetic Induction ~ ? 240.51 mT / 2405 Gs
Coating [Zn] Zinc
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 19x4 / 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 magnet - data

The following values constitute the result of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these data as a reference point when designing systems.

Table 1: Static pull force (force vs gap) - power drop
MW 19x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2405 Gs
240.5 mT
 4.96 kg / 10.93 LBS
4960.0 g / 48.7 N
 warning
1 mm 2239 Gs
223.9 mT
 4.30 kg / 9.48 LBS
4299.0 g / 42.2 N
 warning
2 mm 2033 Gs
203.3 mT
 3.55 kg / 7.82 LBS
3547.4 g / 34.8 N
 warning
3 mm 1811 Gs
181.1 mT
 2.81 kg / 6.20 LBS
2813.0 g / 27.6 N
 warning
5 mm 1376 Gs
137.6 mT
 1.63 kg / 3.58 LBS
1625.2 g / 15.9 N
 weak grip
10 mm 635 Gs
63.5 mT
 0.35 kg / 0.76 LBS
346.3 g / 3.4 N
 weak grip
15 mm 308 Gs
30.8 mT
 0.08 kg / 0.18 LBS
81.2 g / 0.8 N
 weak grip
20 mm 164 Gs
16.4 mT
 0.02 kg / 0.05 LBS
23.2 g / 0.2 N
 weak grip
30 mm 61 Gs
6.1 mT
 0.00 kg / 0.01 LBS
3.1 g / 0.0 N
 weak grip
50 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., dirt, paint, veneer) strongly reduces the pull force. Neodymiums work strongest during direct contact; gap kills the power. Analyze how rapidly the parameters plummet, when the product does not adhere directly to the steel surface. When planning the assembly, eliminate unnecessary gaps.

Table 2: Vertical capacity (vertical surface)
MW 19x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.99 kg / 2.19 LBS
992.0 g / 9.7 N
1 mm Stal (~0.2) 0.86 kg / 1.90 LBS
860.0 g / 8.4 N
2 mm Stal (~0.2) 0.71 kg / 1.57 LBS
710.0 g / 7.0 N
3 mm Stal (~0.2) 0.56 kg / 1.24 LBS
562.0 g / 5.5 N
5 mm Stal (~0.2) 0.33 kg / 0.72 LBS
326.0 g / 3.2 N
10 mm Stal (~0.2) 0.07 kg / 0.15 LBS
70.0 g / 0.7 N
15 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data presents the estimated shear load sufficient to cause the shifting of the magnet downwards along a upright metal surface (considering typical friction coefficient). This parameter depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MW 19x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.49 kg / 3.28 LBS
1488.0 g / 14.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.99 kg / 2.19 LBS
992.0 g / 9.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.50 kg / 1.09 LBS
496.0 g / 4.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.48 kg / 5.47 LBS
2480.0 g / 24.3 N
When mounting a holder on a upright plane (e.g., a board), it you can count on only about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that products slide down faster than they detach. Planning a hanger? Consider that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will give way down under a noticeably lighter weight. Using a rubber pad can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 19x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.50 kg / 1.09 LBS
496.0 g / 4.9 N
1 mm
25%
 1.24 kg / 2.73 LBS
1240.0 g / 12.2 N
2 mm
50%
 2.48 kg / 5.47 LBS
2480.0 g / 24.3 N
3 mm
75%
 3.72 kg / 8.20 LBS
3720.0 g / 36.5 N
5 mm
100%
 4.96 kg / 10.93 LBS
4960.0 g / 48.7 N
10 mm
100%
 4.96 kg / 10.93 LBS
4960.0 g / 48.7 N
11 mm
100%
 4.96 kg / 10.93 LBS
4960.0 g / 48.7 N
12 mm
100%
 4.96 kg / 10.93 LBS
4960.0 g / 48.7 N
A too thin steel is unable to conduct the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's potential, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the holder works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MW 19x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.96 kg / 10.93 LBS
4960.0 g / 48.7 N
 OK
40 °C -2.2% 4.85 kg / 10.69 LBS
4850.9 g / 47.6 N
 OK
60 °C -4.4% 4.74 kg / 10.45 LBS
4741.8 g / 46.5 N
80 °C -6.6% 4.63 kg / 10.21 LBS
4632.6 g / 45.4 N
100 °C -28.8% 3.53 kg / 7.79 LBS
3531.5 g / 34.6 N
Standard neodymium magnets irreversibly lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the magnet's force momentarily lowers. Refrain from using this product in hot environments exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetic properties.
*Important note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 19x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 10.11 kg / 22.28 LBS
3 990 Gs
1.52 kg / 3.34 LBS
1516 g / 14.9 N
 N/A
1 mm 9.48 kg / 20.89 LBS
4 657 Gs
1.42 kg / 3.13 LBS
1421 g / 13.9 N
 8.53 kg / 18.80 LBS
~0 Gs
2 mm 8.76 kg / 19.31 LBS
4 477 Gs
1.31 kg / 2.90 LBS
1314 g / 12.9 N
 7.88 kg / 17.38 LBS
~0 Gs
3 mm 8.00 kg / 17.64 LBS
4 279 Gs
1.20 kg / 2.65 LBS
1200 g / 11.8 N
 7.20 kg / 15.88 LBS
~0 Gs
5 mm 6.47 kg / 14.25 LBS
3 846 Gs
0.97 kg / 2.14 LBS
970 g / 9.5 N
 5.82 kg / 12.83 LBS
~0 Gs
10 mm 3.31 kg / 7.30 LBS
2 753 Gs
0.50 kg / 1.10 LBS
497 g / 4.9 N
 2.98 kg / 6.57 LBS
~0 Gs
20 mm 0.71 kg / 1.56 LBS
1 271 Gs
0.11 kg / 0.23 LBS
106 g / 1.0 N
 0.64 kg / 1.40 LBS
~0 Gs
50 mm 0.02 kg / 0.04 LBS
193 Gs
0.00 kg / 0.01 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
60 mm 0.01 kg / 0.01 LBS
121 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.01 LBS
81 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
56 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
41 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
30 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a wider radius than a magnet and steel setup. The connection of magnet-to-magnet generates a stronger field and a further horizon of performance. Want to build a strong closure? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the pinch force is massive. The levitation is marginally weaker than the attraction, but still significant.
*Flux density between like poles is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
* Figures show friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MW 19x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.5 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a large risk to electronics and pacemakers. These NdFeB products produce a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field passes through tissues and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MW 19x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.39 km/h
(7.05 m/s)
 0.21 J
30 mm 42.19 km/h
(11.72 m/s)
 0.58 J
50 mm 54.44 km/h
(15.12 m/s)
 0.97 J
100 mm 76.99 km/h
(21.39 m/s)
 1.95 J
Magnetic elements are very brittle – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can cause material chips or injury to skin. Be sure to control the product during bringing near metal 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 handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 19x4 / N38

Technical parameter Value / Description
Coating type [Zn] Zinc
Layer structure Zn (Zinc)
Layer thickness 8-15 µm
Salt spray test (SST) ? 48 h
Recommended environment Indoors / Garage
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 19x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 831 Mx 78.3 µWb
Pc Coefficient 0.30 Low (Flat)
Total magnetic flux passing through the pole surface. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 19x4 / N38

Environment Effective steel pull Effect
Air (land) 4.96 kg Standard
Water (riverbed) 5.68 kg
(+0.72 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.30

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
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: 010038-2026
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The presented product is an extremely powerful rod magnet, composed of modern NdFeB material, which, with dimensions of Ø19x4 mm, guarantees the highest energy density. This specific item boasts a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 4.96 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 48.62 N with a weight of only 8.51 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 immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø19x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø19x4 mm, which, at a weight of 8.51 g, makes it an element with high magnetic energy density. The value of 48.62 N means that the magnet is capable of holding a weight many times exceeding its own mass of 8.51 g. 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 4 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 as well as cons of rare earth magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain full power for around ten years – the loss is just ~1% (in theory),
  • Neodymium magnets are characterized by exceptionally resistant to demagnetization caused by magnetic disturbances,
  • Thanks to the shimmering finish, the layer of nickel, gold, or silver gives an clean appearance,
  • Magnetic induction on the top side of the magnet is maximum,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • In view of the ability of precise molding and customization to specialized projects, NdFeB magnets can be modeled in a wide range of shapes and sizes, which increases their versatility,
  • Universal use in electronics industry – they are utilized in magnetic memories, motor assemblies, precision medical tools, as well as other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using cover - magnetic mount.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is higher than average,

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Breakaway force is the result of a measurement for ideal contact conditions, including:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an ground contact surface
  • with direct contact (no coatings)
  • during detachment in a direction vertical to the plane
  • at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Real force impacted by specific conditions, including (from priority):
  • Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Plate material – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
Caution required

Handle with care. Rare earth magnets attract from a distance and snap with huge force, often faster than you can move away.

Warning for allergy sufferers

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.

Permanent damage

Do not overheat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

No play value

NdFeB magnets are not intended for children. Accidental ingestion of multiple magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.

Dust is flammable

Powder generated during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Beware of splinters

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

ICD Warning

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Safe distance

Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Magnetic interference

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Crushing risk

Big blocks can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

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