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MW 19x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010038

GTIN/EAN: 5906301810377

Load capacity 4.96 kg / 48.62 N Magnetic Induction 240.51 mT / 2405 Gs
Diameter Ø
19 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
8.51 g
Magnetization Direction
↑ axial
Coating
[Zn] Zinc

How we measure these parameters — certificates and measurements

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Net
Gross
price from 1 pcs
3.90 zł
4.80 zł
price from 200 pcs
3.67 zł
4.51 zł
price from 650 pcs
3.43 zł
4.22 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Detailed specification - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 analysis of the magnet - technical parameters

These data are the direct effect of a engineering analysis. Values rely on models for the class Nd2Fe14B. Real-world conditions may deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - 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 pounds
4960.0 g / 48.7 N
warning
1 mm 2239 Gs
223.9 mT
4.30 kg / 9.48 pounds
4299.0 g / 42.2 N
warning
2 mm 2033 Gs
203.3 mT
3.55 kg / 7.82 pounds
3547.4 g / 34.8 N
warning
3 mm 1811 Gs
181.1 mT
2.81 kg / 6.20 pounds
2813.0 g / 27.6 N
warning
5 mm 1376 Gs
137.6 mT
1.63 kg / 3.58 pounds
1625.2 g / 15.9 N
low risk
10 mm 635 Gs
63.5 mT
0.35 kg / 0.76 pounds
346.3 g / 3.4 N
low risk
15 mm 308 Gs
30.8 mT
0.08 kg / 0.18 pounds
81.2 g / 0.8 N
low risk
20 mm 164 Gs
16.4 mT
0.02 kg / 0.05 pounds
23.2 g / 0.2 N
low risk
30 mm 61 Gs
6.1 mT
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
low risk
50 mm 15 Gs
1.5 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
low risk

Table 2: Slippage 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 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

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 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

Table 4: Material efficiency (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 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

Table 5: Thermal resistance (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

Table 6: Two magnets (repulsion) - forces in the system
MW 19x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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

Table 7: Safety (HSE) (implants) - precautionary measures
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

Table 8: Impact energy (kinetic energy) - warning
MW 19x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.61 km/h
(6.84 m/s)
0.20 J
30 mm 25.34 km/h
(7.04 m/s)
0.21 J
50 mm 25.35 km/h
(7.04 m/s)
0.21 J
100 mm 25.35 km/h
(7.04 m/s)
0.21 J

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

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)

Table 11: Physics of underwater searching
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

1. Wall mount (shear)

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

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the safety 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.

Technical and environmental data

Elemental analysis

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: 010038-2026
Magnet Unit Converter

Force (pull)


Magnetic Field

Check out also proposals

The presented product is a very strong cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø19x4 mm, guarantees the highest energy density. The MW 19x4 / N38 model is characterized by a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding 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 quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 48.62 N with a weight of only 8.51 g, this cylindrical magnet 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 long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in modeling and machine building, where excessive 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 key parameter here is the holding force amounting to approximately 4.96 kg (force ~48.62 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Advantages and disadvantages of rare earth magnets.

Benefits

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • Their strength is maintained, and after approximately ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under close interference source,
  • A magnet with a smooth silver surface has better aesthetics,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of accurate creating as well as adjusting to concrete conditions,
  • Significant place in advanced technology sectors – they are utilized in computer drives, electric motors, medical equipment, as well as multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited possibility of creating threads in the magnet and complex shapes - recommended is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat it depends on?

The declared magnet strength refers to the maximum value, measured under ideal test conditions, namely:
  • with the contact of a yoke made of special test steel, ensuring maximum field concentration
  • with a thickness of at least 10 mm
  • characterized by smoothness
  • under conditions of gap-free contact (metal-to-metal)
  • during pulling in a direction perpendicular to the mounting surface
  • at temperature room level

Key elements affecting lifting force

During everyday use, the actual lifting capacity is determined by many variables, presented from crucial:
  • Clearance – existence of any layer (rust, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
  • Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Safe distance

Device Safety: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Thermal limits

Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Protective goggles

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Combustion hazard

Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Precision electronics

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Do not bring magnets near a device to prevent breaking the sensors.

Handling guide

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

Do not give to children

Always store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are fatal.

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or choose coated magnets.

Serious injuries

Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Pacemakers

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

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