MW 8x5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010105
GTIN/EAN: 5906301811046
Diameter Ø
8 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
1.88 g
Magnetization Direction
↑ axial
Load capacity
2.17 kg / 21.31 N
Magnetic Induction
483.41 mT / 4834 Gs
Coating
[NiCuNi] Nickel
0.836 ZŁ with VAT / pcs + price for transport
0.680 ZŁ net + 23% VAT / pcs
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Physical properties - MW 8x5 / N38 - cylindrical magnet
Specification / characteristics - MW 8x5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010105 |
| GTIN/EAN | 5906301811046 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 1.88 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.17 kg / 21.31 N |
| Magnetic Induction ~ ? | 483.41 mT / 4834 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 simulation of the product - data
The following values constitute the outcome of a engineering calculation. Results were calculated on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Please consider these calculations as a preliminary roadmap for designers.
Table 1: Static pull force (force vs gap) - characteristics
MW 8x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4830 Gs
483.0 mT
|
2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
|
medium risk |
| 1 mm |
3655 Gs
365.5 mT
|
1.24 kg / 2.74 LBS
1242.8 g / 12.2 N
|
weak grip |
| 2 mm |
2610 Gs
261.0 mT
|
0.63 kg / 1.40 LBS
633.9 g / 6.2 N
|
weak grip |
| 3 mm |
1825 Gs
182.5 mT
|
0.31 kg / 0.68 LBS
310.0 g / 3.0 N
|
weak grip |
| 5 mm |
915 Gs
91.5 mT
|
0.08 kg / 0.17 LBS
77.9 g / 0.8 N
|
weak grip |
| 10 mm |
234 Gs
23.4 mT
|
0.01 kg / 0.01 LBS
5.1 g / 0.1 N
|
weak grip |
| 15 mm |
89 Gs
8.9 mT
|
0.00 kg / 0.00 LBS
0.7 g / 0.0 N
|
weak grip |
| 20 mm |
43 Gs
4.3 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
weak grip |
| 30 mm |
14 Gs
1.4 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Sliding force (wall)
MW 8x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.43 kg / 0.96 LBS
434.0 g / 4.3 N
|
| 1 mm | Stal (~0.2) |
0.25 kg / 0.55 LBS
248.0 g / 2.4 N
|
| 2 mm | Stal (~0.2) |
0.13 kg / 0.28 LBS
126.0 g / 1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.14 LBS
62.0 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 (shearing) - vertical pull
MW 8x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.65 kg / 1.44 LBS
651.0 g / 6.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.43 kg / 0.96 LBS
434.0 g / 4.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.22 kg / 0.48 LBS
217.0 g / 2.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.09 kg / 2.39 LBS
1085.0 g / 10.6 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 8x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.22 kg / 0.48 LBS
217.0 g / 2.1 N
|
| 1 mm |
|
0.54 kg / 1.20 LBS
542.5 g / 5.3 N
|
| 2 mm |
|
1.09 kg / 2.39 LBS
1085.0 g / 10.6 N
|
| 3 mm |
|
1.63 kg / 3.59 LBS
1627.5 g / 16.0 N
|
| 5 mm |
|
2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
|
| 10 mm |
|
2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
|
| 11 mm |
|
2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
|
| 12 mm |
|
2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MW 8x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
|
OK |
| 40 °C | -2.2% |
2.12 kg / 4.68 LBS
2122.3 g / 20.8 N
|
OK |
| 60 °C | -4.4% |
2.07 kg / 4.57 LBS
2074.5 g / 20.4 N
|
OK |
| 80 °C | -6.6% |
2.03 kg / 4.47 LBS
2026.8 g / 19.9 N
|
|
| 100 °C | -28.8% |
1.55 kg / 3.41 LBS
1545.0 g / 15.2 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 8x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
7.23 kg / 15.94 LBS
5 742 Gs
|
1.08 kg / 2.39 LBS
1084 g / 10.6 N
|
N/A |
| 1 mm |
5.58 kg / 12.31 LBS
8 490 Gs
|
0.84 kg / 1.85 LBS
838 g / 8.2 N
|
5.03 kg / 11.08 LBS
~0 Gs
|
| 2 mm |
4.14 kg / 9.13 LBS
7 310 Gs
|
0.62 kg / 1.37 LBS
621 g / 6.1 N
|
3.73 kg / 8.21 LBS
~0 Gs
|
| 3 mm |
2.98 kg / 6.58 LBS
6 207 Gs
|
0.45 kg / 0.99 LBS
448 g / 4.4 N
|
2.69 kg / 5.92 LBS
~0 Gs
|
| 5 mm |
1.48 kg / 3.26 LBS
4 369 Gs
|
0.22 kg / 0.49 LBS
222 g / 2.2 N
|
1.33 kg / 2.93 LBS
~0 Gs
|
| 10 mm |
0.26 kg / 0.57 LBS
1 830 Gs
|
0.04 kg / 0.09 LBS
39 g / 0.4 N
|
0.23 kg / 0.51 LBS
~0 Gs
|
| 20 mm |
0.02 kg / 0.04 LBS
468 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.03 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
47 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
29 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
19 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
13 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
9 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
7 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MW 8x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 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 (cracking risk) - warning
MW 8x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
34.31 km/h
(9.53 m/s)
|
0.09 J | |
| 30 mm |
59.35 km/h
(16.49 m/s)
|
0.26 J | |
| 50 mm |
76.62 km/h
(21.28 m/s)
|
0.43 J | |
| 100 mm |
108.35 km/h
(30.10 m/s)
|
0.85 J |
Table 9: Corrosion resistance
MW 8x5 / 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 8x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 450 Mx | 24.5 µWb |
| Pc Coefficient | 0.68 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 8x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.17 kg | Standard |
| Water (riverbed) |
2.48 kg
(+0.31 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical wall, the magnet retains just ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Thermal stability
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.68
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 |
Other deals
Strengths and weaknesses of neodymium magnets.
Pros
- They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
- They have excellent resistance to magnetism drop due to external magnetic sources,
- Thanks to the shiny finish, the coating of nickel, gold, or silver-plated gives an elegant appearance,
- Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Possibility of individual creating as well as optimizing to specific conditions,
- Universal use in modern technologies – they serve a role in data components, electric motors, diagnostic systems, and modern systems.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Disadvantages
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets lose 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 durability even at temperatures up to 230°C
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
- Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
- Due to neodymium price, their price exceeds standard values,
Pull force analysis
Maximum lifting capacity of the magnet – what affects it?
- using a sheet made of low-carbon steel, acting as a magnetic yoke
- possessing a thickness of minimum 10 mm to ensure full flux closure
- characterized by even structure
- under conditions of no distance (metal-to-metal)
- for force applied at a right angle (in the magnet axis)
- in stable room temperature
Lifting capacity in real conditions – factors
- Distance (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or dirt).
- Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Steel type – mild steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
- Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
- Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Phone sensors
Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Electronic devices
Data protection: Strong magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, timepieces).
Choking Hazard
Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.
Avoid contact if allergic
Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop working with magnets and wear gloves.
Protective goggles
Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.
Implant safety
Patients with a heart stimulator must maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.
Operating temperature
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.
Flammability
Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.
Conscious usage
Handle with care. Rare earth magnets act from a long distance and connect with massive power, often quicker than you can react.
Crushing risk
Large magnets can break fingers in a fraction of a second. Do not place your hand between two attracting surfaces.
