MW 8x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010103
GTIN/EAN: 5906301811022
Diameter Ø
8 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.13 g
Magnetization Direction
↑ axial
Load capacity
1.70 kg / 16.67 N
Magnetic Induction
371.53 mT / 3715 Gs
Coating
[NiCuNi] Nickel
0.701 ZŁ with VAT / pcs + price for transport
0.570 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Contact us by phone
+48 888 99 98 98
if you prefer let us know by means of
our online form
the contact form page.
Weight and structure of magnets can be calculated with our
force calculator.
Order by 14:00 and we’ll ship today!
Technical specification - MW 8x3 / N38 - cylindrical magnet
Specification / characteristics - MW 8x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010103 |
| GTIN/EAN | 5906301811022 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 1.13 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.70 kg / 16.67 N |
| Magnetic Induction ~ ? | 371.53 mT / 3715 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| 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
| 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 |
Technical simulation of the product - technical parameters
The following data are the outcome of a engineering analysis. Values are based on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these calculations as a reference point when designing systems.
Table 1: Static force (force vs gap) - characteristics
MW 8x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3712 Gs
371.2 mT
|
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
|
weak grip |
| 1 mm |
2880 Gs
288.0 mT
|
1.02 kg / 2.26 lbs
1023.3 g / 10.0 N
|
weak grip |
| 2 mm |
2069 Gs
206.9 mT
|
0.53 kg / 1.16 lbs
527.9 g / 5.2 N
|
weak grip |
| 3 mm |
1439 Gs
143.9 mT
|
0.26 kg / 0.56 lbs
255.3 g / 2.5 N
|
weak grip |
| 5 mm |
704 Gs
70.4 mT
|
0.06 kg / 0.13 lbs
61.1 g / 0.6 N
|
weak grip |
| 10 mm |
169 Gs
16.9 mT
|
0.00 kg / 0.01 lbs
3.5 g / 0.0 N
|
weak grip |
| 15 mm |
62 Gs
6.2 mT
|
0.00 kg / 0.00 lbs
0.5 g / 0.0 N
|
weak grip |
| 20 mm |
29 Gs
2.9 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
weak grip |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage load (wall)
MW 8x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.34 kg / 0.75 lbs
340.0 g / 3.3 N
|
| 1 mm | Stal (~0.2) |
0.20 kg / 0.45 lbs
204.0 g / 2.0 N
|
| 2 mm | Stal (~0.2) |
0.11 kg / 0.23 lbs
106.0 g / 1.0 N
|
| 3 mm | Stal (~0.2) |
0.05 kg / 0.11 lbs
52.0 g / 0.5 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 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
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 8x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.51 kg / 1.12 lbs
510.0 g / 5.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.34 kg / 0.75 lbs
340.0 g / 3.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.17 kg / 0.37 lbs
170.0 g / 1.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.85 kg / 1.87 lbs
850.0 g / 8.3 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.17 kg / 0.37 lbs
170.0 g / 1.7 N
|
| 1 mm |
|
0.43 kg / 0.94 lbs
425.0 g / 4.2 N
|
| 2 mm |
|
0.85 kg / 1.87 lbs
850.0 g / 8.3 N
|
| 3 mm |
|
1.28 kg / 2.81 lbs
1275.0 g / 12.5 N
|
| 5 mm |
|
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
|
| 10 mm |
|
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
|
| 11 mm |
|
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
|
| 12 mm |
|
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
|
Table 5: Thermal stability (stability) - thermal limit
MW 8x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
|
OK |
| 40 °C | -2.2% |
1.66 kg / 3.67 lbs
1662.6 g / 16.3 N
|
OK |
| 60 °C | -4.4% |
1.63 kg / 3.58 lbs
1625.2 g / 15.9 N
|
|
| 80 °C | -6.6% |
1.59 kg / 3.50 lbs
1587.8 g / 15.6 N
|
|
| 100 °C | -28.8% |
1.21 kg / 2.67 lbs
1210.4 g / 11.9 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 8x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.27 kg / 9.42 lbs
5 146 Gs
|
0.64 kg / 1.41 lbs
641 g / 6.3 N
|
N/A |
| 1 mm |
3.40 kg / 7.50 lbs
6 627 Gs
|
0.51 kg / 1.13 lbs
510 g / 5.0 N
|
3.06 kg / 6.75 lbs
~0 Gs
|
| 2 mm |
2.57 kg / 5.67 lbs
5 761 Gs
|
0.39 kg / 0.85 lbs
386 g / 3.8 N
|
2.31 kg / 5.10 lbs
~0 Gs
|
| 3 mm |
1.87 kg / 4.12 lbs
4 914 Gs
|
0.28 kg / 0.62 lbs
281 g / 2.8 N
|
1.68 kg / 3.71 lbs
~0 Gs
|
| 5 mm |
0.93 kg / 2.04 lbs
3 456 Gs
|
0.14 kg / 0.31 lbs
139 g / 1.4 N
|
0.83 kg / 1.84 lbs
~0 Gs
|
| 10 mm |
0.15 kg / 0.34 lbs
1 408 Gs
|
0.02 kg / 0.05 lbs
23 g / 0.2 N
|
0.14 kg / 0.30 lbs
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 lbs
339 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
31 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
19 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
12 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
8 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
6 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
4 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
MW 8x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 8x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
39.17 km/h
(10.88 m/s)
|
0.07 J | |
| 30 mm |
67.75 km/h
(18.82 m/s)
|
0.20 J | |
| 50 mm |
87.47 km/h
(24.30 m/s)
|
0.33 J | |
| 100 mm |
123.70 km/h
(34.36 m/s)
|
0.67 J |
Table 9: Corrosion resistance
MW 8x3 / N38
| Technical parameter | Value / Description |
|---|---|
| Coating type | [NiCuNi] Nickel |
| Layer structure | Nickel - Copper - Nickel |
| Layer thickness | 10-20 µm |
| Salt spray test (SST) ? | 24 h |
| Recommended environment | Indoors only (dry) |
Table 10: Construction data (Flux)
MW 8x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 946 Mx | 19.5 µWb |
| Pc Coefficient | 0.48 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 8x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.70 kg | Standard |
| Water (riverbed) |
1.95 kg
(+0.25 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically 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) = 0.48
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Check out more products
Strengths and weaknesses of Nd2Fe14B magnets.
Advantages
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- They show high resistance to demagnetization induced by external disturbances,
- The use of an refined layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to the ability of flexible molding and customization to specialized needs, magnetic components can be modeled in a broad palette of shapes and sizes, which expands the range of possible applications,
- Universal use in modern technologies – they are utilized in hard drives, electric motors, medical devices, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems
Cons
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets experience a drop in strength. 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
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
- Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- With large orders the cost of neodymium magnets can be a barrier,
Pull force analysis
Highest magnetic holding force – what it depends on?
- with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- with a thickness minimum 10 mm
- with an ideally smooth touching surface
- without any insulating layer between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at ambient temperature approx. 20 degrees Celsius
Lifting capacity in practice – influencing factors
- Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and lifting capacity.
- Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.
Precautions when working with NdFeB magnets
Phone sensors
Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Mechanical processing
Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.
Caution required
Use magnets with awareness. Their immense force can shock even experienced users. Plan your moves and respect their force.
Data carriers
Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.
Permanent damage
Avoid heat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Physical harm
Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Medical implants
Warning for patients: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.
Material brittleness
Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.
Metal Allergy
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness happens, cease handling magnets and wear gloves.
Do not give to children
These products are not intended for children. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.
