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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

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4.80 ZŁ with VAT / pcs + price for transport

3.90 ZŁ net + 23% VAT / pcs

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Technical - 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 simulation of the assembly - data

The following information are the outcome of a physical simulation. Results were calculated on models for the material Nd2Fe14B. Actual parameters might slightly differ. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
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
Grip strength weakens drastically with every mm of gap. Note that every additional insulation layer (e.g., contamination, paint, rust) significantly reduces the pull force. Neodymiums work strongest during direct contact; gap nullifies the power. See how rapidly the pull force drop, when the magnet does not touch flatly to the steel surface. When designing the assembly, discard additional spacers.

Table 2: Shear capacity (wall)
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 approximate holding capacity sufficient to start the sliding of the magnet down along a upright metal surface (assuming typical friction coefficient). The holding force depends on the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 placing a holder on a vertical surface (e.g., a board), it will maintain barely about 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that holders slip easier than they pull off. Designing a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a significantly smaller cargo. Utilizing a rubberized layer can significantly increase the grip.

Table 4: Material efficiency (saturation) - 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 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 thin metal plate is incapable of conduct the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a thin surface, the field will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid piece of metal. The material oversaturation causes that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (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
Ordinary NdFeB products lose parameters above the temperature limit. Watch out for overheating – heat can irreversibly destroy this product. With every degree above norm, the neodymium's power momentarily lowers. Refrain from using this magnet close to ovens exceeding its safe range. Too high temperature will result in permanent loss of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
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 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 attract each other from a significantly greater distance than a magnet and sheet combination. The setup of two magnets creates a more powerful interaction and a further horizon of operation. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is extreme. The levitation is slightly lower than the connection force, but still impressive.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Estimates apply to friction force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - 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
Mechanical watch 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
Extremely neodym field poses a large risk to electronic devices and pacemakers. These NdFeB products produce a flux that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - 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
Magnetic elements are delicate – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or injury to fingers. Be sure to control the product 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 magnet. Use safety goggles when working with powerful specimens.

Table 9: Coating parameters (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
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MW 19x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 831 Mx 78.3 µWb
Pc Coefficient 0.30 Low (Flat)
Flux value emitted by the pole surface. Key data for generator designers and motors. The Pc coefficient 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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*For N38 grade, the max working temp is 80°C.

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

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

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.

Technical specification and ecology
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: 010038-2026
Magnet Unit Converter
Magnet pull force
Magnetic Field
Input your value in a single field to generate results in the other units immediately.

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The presented product is an extremely powerful cylindrical magnet, produced from modern NdFeB material, which, at dimensions of Ø19x4 mm, guarantees the highest energy density. The MW 19x4 / N38 model boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 4.96 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, 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 modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 48.62 N with a weight of only 8.51 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 19.1 mm) using epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for the majority 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 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 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. 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.

Strengths as well as weaknesses of neodymium magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their power is maintained, and after around ten years it drops only by ~1% (according to research),
  • Neodymium magnets are distinguished by extremely resistant to demagnetization caused by external magnetic fields,
  • By applying a reflective coating of silver, the element presents an professional look,
  • Magnets possess maximum magnetic induction on the active area,
  • 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...
  • In view of the ability of accurate molding and customization to specialized requirements, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which increases their versatility,
  • Significant place in electronics industry – they serve a role in computer drives, electric drive systems, medical equipment, and modern systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Magnetic strength at its maximum – what affects it?

The specified lifting capacity refers to the limit force, recorded under optimal environment, meaning:
  • with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section no less than 10 mm
  • with a surface free of scratches
  • with total lack of distance (no coatings)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Determinants of lifting force in real conditions

Real force impacted by working environment parameters, mainly (from most important):
  • Distance (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Base massiveness – too thin sheet does not accept the full field, causing part of the power to be lost to the other side.
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Beware of splinters

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Mechanical processing

Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Swallowing risk

Product intended for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.

Handling rules

Be careful. Neodymium magnets act from a distance and snap with huge force, often quicker than you can move away.

Electronic devices

Very strong magnetic fields can destroy records on payment cards, HDDs, and storage devices. Stay away of min. 10 cm.

Allergic reactions

A percentage of the population have a contact allergy to Ni, which is the common plating for neodymium magnets. Prolonged contact can result in skin redness. It is best to wear safety gloves.

Life threat

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

Bodily injuries

Pinching hazard: The attraction force is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

GPS and phone interference

An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Heat sensitivity

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.

Warning! Learn more about risks in the article: Safety of working with magnets.