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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

product parameters »

4.80 ZŁ with VAT / pcs + price for transport

3.90 ZŁ net + 23% VAT / pcs

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Product card - 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

Engineering modeling of the magnet - technical parameters

The following information represent the direct effect of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
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 pounds
4960.0 g / 48.7 N
 medium risk
1 mm 2239 Gs
223.9 mT
 4.30 kg / 9.48 pounds
4299.0 g / 42.2 N
 medium risk
2 mm 2033 Gs
203.3 mT
 3.55 kg / 7.82 pounds
3547.4 g / 34.8 N
 medium risk
3 mm 1811 Gs
181.1 mT
 2.81 kg / 6.20 pounds
2813.0 g / 27.6 N
 medium risk
5 mm 1376 Gs
137.6 mT
 1.63 kg / 3.58 pounds
1625.2 g / 15.9 N
 weak grip
10 mm 635 Gs
63.5 mT
 0.35 kg / 0.76 pounds
346.3 g / 3.4 N
 weak grip
15 mm 308 Gs
30.8 mT
 0.08 kg / 0.18 pounds
81.2 g / 0.8 N
 weak grip
20 mm 164 Gs
16.4 mT
 0.02 kg / 0.05 pounds
23.2 g / 0.2 N
 weak grip
30 mm 61 Gs
6.1 mT
 0.00 kg / 0.01 pounds
3.1 g / 0.0 N
 weak grip
50 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 pounds
0.2 g / 0.0 N
 weak grip
Magnetic force drops sharply with every subsequent millimeter of gap. Keep in mind that even the smallest gap (e.g., contamination, paint, dust) noticeably weakens the grip. Magnetic products hold strongest during direct contact; distance kills the power. Analyze how rapidly the pull force plummet, when the product does not adhere tightly to the steel surface. When planning the arrangement, eliminate additional spacers.

Table 2: Vertical hold (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 pounds
992.0 g / 9.7 N
1 mm Stal (~0.2) 0.86 kg / 1.90 pounds
860.0 g / 8.4 N
2 mm Stal (~0.2) 0.71 kg / 1.57 pounds
710.0 g / 7.0 N
3 mm Stal (~0.2) 0.56 kg / 1.24 pounds
562.0 g / 5.5 N
5 mm Stal (~0.2) 0.33 kg / 0.72 pounds
326.0 g / 3.2 N
10 mm Stal (~0.2) 0.07 kg / 0.15 pounds
70.0 g / 0.7 N
15 mm Stal (~0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data shows the estimated shear load required to cause the sliding of the magnet down along a vertical steel plate (assuming typical friction coefficient). This value is a function of the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 pounds
1488.0 g / 14.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.99 kg / 2.19 pounds
992.0 g / 9.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.50 kg / 1.09 pounds
496.0 g / 4.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.48 kg / 5.47 pounds
2480.0 g / 24.3 N
When mounting a magnet on a vertical wall (e.g., a car body), it you can count on barely about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets move down easier than they detach. Want to create a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the element will slip down under a noticeably lighter cargo. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MW 19x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.50 kg / 1.09 pounds
496.0 g / 4.9 N
1 mm
25%
 1.24 kg / 2.73 pounds
1240.0 g / 12.2 N
2 mm
50%
 2.48 kg / 5.47 pounds
2480.0 g / 24.3 N
3 mm
75%
 3.72 kg / 8.20 pounds
3720.0 g / 36.5 N
5 mm
100%
 4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
10 mm
100%
 4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
11 mm
100%
 4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
12 mm
100%
 4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
A thin metal plate cannot absorb the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you need a suitably thick element of steel. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the magnet works worse. We recommend selecting the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MW 19x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
 OK
40 °C -2.2% 4.85 kg / 10.69 pounds
4850.9 g / 47.6 N
 OK
60 °C -4.4% 4.74 kg / 10.45 pounds
4741.8 g / 46.5 N
80 °C -6.6% 4.63 kg / 10.21 pounds
4632.6 g / 45.4 N
100 °C -28.8% 3.53 kg / 7.79 pounds
3531.5 g / 34.6 N
Classic neodymiums irreversibly lose power past the thermal threshold. Watch out for overheating – heat can permanently destroy this product. With every degree above norm, the neodymium's capacity temporarily decreases. Refrain from using this product close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will cause destruction of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently sooner compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 10.11 kg / 22.28 pounds
3 990 Gs
1.52 kg / 3.34 pounds
1516 g / 14.9 N
 N/A
1 mm 9.48 kg / 20.89 pounds
4 657 Gs
1.42 kg / 3.13 pounds
1421 g / 13.9 N
 8.53 kg / 18.80 pounds
~0 Gs
2 mm 8.76 kg / 19.31 pounds
4 477 Gs
1.31 kg / 2.90 pounds
1314 g / 12.9 N
 7.88 kg / 17.38 pounds
~0 Gs
3 mm 8.00 kg / 17.64 pounds
4 279 Gs
1.20 kg / 2.65 pounds
1200 g / 11.8 N
 7.20 kg / 15.88 pounds
~0 Gs
5 mm 6.47 kg / 14.25 pounds
3 846 Gs
0.97 kg / 2.14 pounds
970 g / 9.5 N
 5.82 kg / 12.83 pounds
~0 Gs
10 mm 3.31 kg / 7.30 pounds
2 753 Gs
0.50 kg / 1.10 pounds
497 g / 4.9 N
 2.98 kg / 6.57 pounds
~0 Gs
20 mm 0.71 kg / 1.56 pounds
1 271 Gs
0.11 kg / 0.23 pounds
106 g / 1.0 N
 0.64 kg / 1.40 pounds
~0 Gs
50 mm 0.02 kg / 0.04 pounds
193 Gs
0.00 kg / 0.01 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
60 mm 0.01 kg / 0.01 pounds
121 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.01 pounds
81 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
56 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
41 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
30 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and steel setup. The connection of two magnets creates a more powerful interaction and a wider radius of action. Planning to create a solid fastener? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is extreme. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).
Important: Estimates demonstrate friction force of dual same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Remote 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
Powerful magnet radiation poses a large risk to electronics and pacemakers. These neodymiums produce a flux that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field penetrates the body and plastic. Special caution must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
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
NdFeB products are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Corrosion resistance
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
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

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 emitted by the magnet pole. Key data in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Temperature resistance

*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) = 0.30

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%
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: 010038-2026
Magnet Unit Converter
Force (pull)
Magnetic Field
Simply complete one field, and the converter fill in everything else instantly.

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This product is a very strong cylindrical magnet, produced from modern NdFeB material, which, at dimensions of Ø19x4 mm, guarantees maximum efficiency. The MW 19x4 / N38 component is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 4.96 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction 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.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 19.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% 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 (Ø19x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø19x4 mm, which, at a weight of 8.51 g, makes it an element with impressive 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 secures it 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 19 mm. 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 rare earth magnets.

Pros

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • Their power remains stable, and after approximately ten years it drops only by ~1% (theoretically),
  • Neodymium magnets are remarkably resistant to loss of magnetic properties caused by external magnetic fields,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of accurate forming as well as adapting to atypical conditions,
  • Wide application in innovative solutions – they are commonly used in HDD drives, electric drive systems, precision medical tools, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in miniature devices

Cons

Cons of neodymium magnets and proposals for their use:
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Additionally, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 4.96 kg is a measurement result performed under the following configuration:
  • using a sheet made of low-carbon steel, acting as a circuit closing element
  • with a cross-section of at least 10 mm
  • characterized by lack of roughness
  • with zero gap (no coatings)
  • during detachment in a direction vertical to the plane
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Please note that the working load will differ influenced by the following factors, starting with the most relevant:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Chemical composition of the base – mild steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Heat warning

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

Data carriers

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Medical interference

Patients with a heart stimulator have to keep an large gap from magnets. The magnetic field can disrupt the operation of the implant.

Precision electronics

Remember: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a separation from your phone, device, and navigation systems.

Magnets are brittle

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

Dust is flammable

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Handling rules

Be careful. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.

Do not give to children

Absolutely keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are life-threatening.

Bodily injuries

Danger of trauma: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Warning for allergy sufferers

A percentage of the population suffer from a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling might lead to dermatitis. We suggest wear protective gloves.

Safety First! Need more info? Check our post: Are neodymium magnets dangerous?