MW 8x8 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010106
GTIN/EAN: 5906301811053
Diameter Ø
8 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
3.02 g
Magnetization Direction
↑ axial
Load capacity
2.03 kg / 19.92 N
Magnetic Induction
553.67 mT / 5537 Gs
Coating
[NiCuNi] Nickel
1.341 ZŁ with VAT / pcs + price for transport
1.090 ZŁ net + 23% VAT / pcs
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Technical of the product - MW 8x8 / N38 - cylindrical magnet
Specification / characteristics - MW 8x8 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010106 |
| GTIN/EAN | 5906301811053 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 8 mm [±0,1 mm] |
| Weight | 3.02 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.03 kg / 19.92 N |
| Magnetic Induction ~ ? | 553.67 mT / 5537 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 |
Engineering analysis of the magnet - report
The following information constitute the direct effect of a engineering calculation. Values were calculated on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide for designers.
Table 1: Static force (pull vs distance) - power drop
MW 8x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5531 Gs
553.1 mT
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
medium risk |
| 1 mm |
4162 Gs
416.2 mT
|
1.15 kg / 2.53 lbs
1149.3 g / 11.3 N
|
safe |
| 2 mm |
2984 Gs
298.4 mT
|
0.59 kg / 1.30 lbs
590.7 g / 5.8 N
|
safe |
| 3 mm |
2107 Gs
210.7 mT
|
0.29 kg / 0.65 lbs
294.5 g / 2.9 N
|
safe |
| 5 mm |
1084 Gs
108.4 mT
|
0.08 kg / 0.17 lbs
78.0 g / 0.8 N
|
safe |
| 10 mm |
296 Gs
29.6 mT
|
0.01 kg / 0.01 lbs
5.8 g / 0.1 N
|
safe |
| 15 mm |
118 Gs
11.8 mT
|
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
|
safe |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
safe |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Sliding force (vertical surface)
MW 8x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.41 kg / 0.90 lbs
406.0 g / 4.0 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.12 kg / 0.26 lbs
118.0 g / 1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.13 lbs
58.0 g / 0.6 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
16.0 g / 0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.61 kg / 1.34 lbs
609.0 g / 6.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.41 kg / 0.90 lbs
406.0 g / 4.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.20 kg / 0.45 lbs
203.0 g / 2.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.02 kg / 2.24 lbs
1015.0 g / 10.0 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.20 kg / 0.45 lbs
203.0 g / 2.0 N
|
| 1 mm |
|
0.51 kg / 1.12 lbs
507.5 g / 5.0 N
|
| 2 mm |
|
1.02 kg / 2.24 lbs
1015.0 g / 10.0 N
|
| 3 mm |
|
1.52 kg / 3.36 lbs
1522.5 g / 14.9 N
|
| 5 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
| 10 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
| 11 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
| 12 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
Table 5: Thermal resistance (stability) - power drop
MW 8x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
OK |
| 40 °C | -2.2% |
1.99 kg / 4.38 lbs
1985.3 g / 19.5 N
|
OK |
| 60 °C | -4.4% |
1.94 kg / 4.28 lbs
1940.7 g / 19.0 N
|
OK |
| 80 °C | -6.6% |
1.90 kg / 4.18 lbs
1896.0 g / 18.6 N
|
|
| 100 °C | -28.8% |
1.45 kg / 3.19 lbs
1445.4 g / 14.2 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 8x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
9.48 kg / 20.90 lbs
6 000 Gs
|
1.42 kg / 3.14 lbs
1422 g / 14.0 N
|
N/A |
| 1 mm |
7.26 kg / 16.01 lbs
9 682 Gs
|
1.09 kg / 2.40 lbs
1089 g / 10.7 N
|
6.54 kg / 14.41 lbs
~0 Gs
|
| 2 mm |
5.37 kg / 11.83 lbs
8 324 Gs
|
0.81 kg / 1.78 lbs
805 g / 7.9 N
|
4.83 kg / 10.65 lbs
~0 Gs
|
| 3 mm |
3.88 kg / 8.55 lbs
7 074 Gs
|
0.58 kg / 1.28 lbs
582 g / 5.7 N
|
3.49 kg / 7.69 lbs
~0 Gs
|
| 5 mm |
1.95 kg / 4.30 lbs
5 016 Gs
|
0.29 kg / 0.64 lbs
292 g / 2.9 N
|
1.75 kg / 3.87 lbs
~0 Gs
|
| 10 mm |
0.36 kg / 0.80 lbs
2 169 Gs
|
0.05 kg / 0.12 lbs
55 g / 0.5 N
|
0.33 kg / 0.72 lbs
~0 Gs
|
| 20 mm |
0.03 kg / 0.06 lbs
592 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.02 kg / 0.05 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
66 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
41 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
27 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
19 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
14 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
10 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MW 8x8 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Car key | 50 Gs (5.0 mT) | 2.5 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) - warning
MW 8x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
26.19 km/h
(7.28 m/s)
|
0.08 J | |
| 30 mm |
45.29 km/h
(12.58 m/s)
|
0.24 J | |
| 50 mm |
58.47 km/h
(16.24 m/s)
|
0.40 J | |
| 100 mm |
82.68 km/h
(22.97 m/s)
|
0.80 J |
Table 9: Anti-corrosion coating durability
MW 8x8 / 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: Electrical data (Flux)
MW 8x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 868 Mx | 28.7 µWb |
| Pc Coefficient | 0.89 | High (Stable) |
Table 11: Submerged application
MW 8x8 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.03 kg | Standard |
| Water (riverbed) |
2.32 kg
(+0.29 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical surface, the magnet retains only ~20% of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.89
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Strengths and weaknesses of Nd2Fe14B magnets.
Pros
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
- They feature excellent resistance to weakening of magnetic properties as a result of external fields,
- In other words, due to the shiny surface of gold, the element gains a professional look,
- Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to versatility in designing and the ability to adapt to client solutions,
- Universal use in future technologies – they find application in mass storage devices, electric motors, medical devices, and complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- Due to limitations in producing threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities
Holding force characteristics
Highest magnetic holding force – what affects it?
- using a sheet made of low-carbon steel, serving as a magnetic yoke
- possessing a thickness of minimum 10 mm to avoid saturation
- with an ideally smooth contact surface
- under conditions of no distance (surface-to-surface)
- under axial force vector (90-degree angle)
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
- Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Direction of force – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Plate material – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
- Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the holding force.
Precautions when working with NdFeB magnets
Electronic devices
Avoid bringing magnets near a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.
Bodily injuries
Large magnets can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.
Impact on smartphones
Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.
Allergy Warning
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.
Thermal limits
Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.
Mechanical processing
Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.
Danger to pacemakers
Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Danger to the youngest
Only for adults. Tiny parts pose a choking risk, causing serious injuries. Store away from kids and pets.
Caution required
Exercise caution. Neodymium magnets act from a distance and snap with huge force, often faster than you can move away.
Protective goggles
Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.
