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
- Coating
- [Zn] Zinc
How we measure these parameters — certificates and measurements
3.90 zł net / pcs
4.80 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
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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Detailed specification - MW 19x4 / N38 - cylindrical magnet
Specification / characteristics - MW 19x4 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010038 |
| GTIN/EAN | 5906301810377 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 |
|
0.50 kg / 1.09 pounds
496.0 g / 4.9 N
|
| 1 mm |
|
1.24 kg / 2.73 pounds
1240.0 g / 12.2 N
|
| 2 mm |
|
2.48 kg / 5.47 pounds
2480.0 g / 24.3 N
|
| 3 mm |
|
3.72 kg / 8.20 pounds
3720.0 g / 36.5 N
|
| 5 mm |
|
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
|
| 10 mm |
|
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
|
| 11 mm |
|
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
|
| 12 mm |
|
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% |
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.
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 |
Check out also proposals
Advantages and disadvantages of rare earth magnets.
Benefits
- 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
- 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 conditions – what it depends on?
- 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
- 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.
