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
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Technical of the product - 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 |
Physical analysis of the assembly - technical parameters
These data represent the result of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.
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
|
safe |
| 1 mm |
2880 Gs
288.0 mT
|
1.02 kg / 2.26 LBS
1023.3 g / 10.0 N
|
safe |
| 2 mm |
2069 Gs
206.9 mT
|
0.53 kg / 1.16 LBS
527.9 g / 5.2 N
|
safe |
| 3 mm |
1439 Gs
143.9 mT
|
0.26 kg / 0.56 LBS
255.3 g / 2.5 N
|
safe |
| 5 mm |
704 Gs
70.4 mT
|
0.06 kg / 0.13 LBS
61.1 g / 0.6 N
|
safe |
| 10 mm |
169 Gs
16.9 mT
|
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
|
safe |
| 15 mm |
62 Gs
6.2 mT
|
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
|
safe |
| 20 mm |
29 Gs
2.9 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
safe |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Slippage force (vertical surface)
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 (substrate influence) - 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) - power drop
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: Two magnets (attraction) - forces in the system
MW 8x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral 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: Hazards (implants) - precautionary measures
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 |
| Timepiece | 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: Impact energy (cracking risk) - warning
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: Electrical 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: Submerged application
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. Wall mount (shear)
*Warning: On a vertical wall, the magnet retains only a fraction of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) significantly reduces the holding force.
3. Heat tolerance
*For N38 material, 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
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of rare earth magnets.
Advantages
- Their magnetic field is maintained, and after around ten years it decreases only by ~1% (according to research),
- Neodymium magnets prove to be extremely resistant to magnetic field loss caused by external interference,
- By applying a smooth layer of nickel, the element acquires an professional look,
- They feature high magnetic induction at the operating surface, making them more effective,
- 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 possibility of precise molding and adaptation to unique requirements, neodymium magnets can be modeled in a wide range of forms and dimensions, which expands the range of possible applications,
- Universal use in modern technologies – they are used in magnetic memories, motor assemblies, medical equipment, and complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 nuts and complex shapes in magnets, we propose using a housing - magnetic holder.
- Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these products can complicate diagnosis medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Holding force characteristics
Detachment force of the magnet in optimal conditions – what affects it?
- on a plate made of structural steel, perfectly concentrating the magnetic flux
- whose transverse dimension is min. 10 mm
- characterized by smoothness
- under conditions of ideal adhesion (surface-to-surface)
- under vertical application of breakaway force (90-degree angle)
- in stable room temperature
What influences lifting capacity in practice
- Distance (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be wasted into the air.
- Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
- Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.
Precautions when working with neodymium magnets
Protective goggles
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them breaking into small pieces.
Bone fractures
Large magnets can break fingers in a fraction of a second. Do not place your hand between two attracting surfaces.
Respect the power
Handle with care. Rare earth magnets attract from a distance and snap with massive power, often faster than you can react.
Maximum temperature
Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and pulling force.
Medical implants
Individuals with a ICD have to keep an large gap from magnets. The magnetism can disrupt the operation of the implant.
Danger to the youngest
Always store magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are fatal.
GPS Danger
An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets near a device to avoid breaking the sensors.
Allergic reactions
A percentage of the population experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause dermatitis. We strongly advise use protective gloves.
Data carriers
Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).
Fire warning
Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
