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
- Coating
- [NiCuNi] Nickel
0.836 zł with VAT / pcs + price for transport
0.680 zł net + 23% VAT / pcs
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Need more?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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Technical data - 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 |
Physical simulation of the product - data
Presented information are the outcome of a mathematical analysis. Results were calculated on models for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these data as a reference point when designing systems.
Table 1: Static pull force (force vs gap) - power drop
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: Slippage capacity (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: Vertical assembly (shearing) - behavior on slippery surfaces
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) - sheet metal selection
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: Working in heat (material behavior) - 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: Two magnets (attraction) - forces in the system
MW 8x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Safety (HSE) (electronics) - precautionary measures
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 |
| Mechanical watch | 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: Collisions (cracking risk) - collision effects
MW 8x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.78 km/h
(6.05 m/s)
|
0.03 J | |
| 30 mm |
21.82 km/h
(6.06 m/s)
|
0.03 J | |
| 50 mm |
21.82 km/h
(6.06 m/s)
|
0.03 J | |
| 100 mm |
21.83 km/h
(6.06 m/s)
|
0.03 J |
Table 9: Surface protection spec
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 (Pc)
MW 8x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 450 Mx | 24.5 µWb |
| Pc Coefficient | 0.68 | High (Stable) |
Table 11: Submerged application
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. Wall mount (shear)
*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Temperature resistance
*For N38 grade, the safety 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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View more proposals
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
- They possess excellent resistance to magnetic field loss as a result of external fields,
- By covering with a lustrous coating of nickel, the element presents an modern look,
- Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures reaching 230°C and above...
- Thanks to the ability of precise molding and customization to specialized solutions, magnetic components can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
- Universal use in electronics industry – they are used in HDD drives, electromotive mechanisms, diagnostic systems, also technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Limitations
- At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease their strength 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
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Limited possibility of creating nuts in the magnet and complex shapes - recommended is a housing - mounting mechanism.
- Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these products are able to be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum lifting force for a neodymium magnet – what affects it?
- using a plate made of mild steel, serving as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- with an ideally smooth contact surface
- with direct contact (without impurities)
- under axial force direction (90-degree angle)
- at standard ambient temperature
Determinants of practical lifting force of a magnet
- Distance (between the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
- Material type – the best choice is high-permeability steel. Stainless steels may attract less.
- Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
- Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.
Safety rules for work with neodymium magnets
Choking Hazard
Only for adults. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.
Physical harm
Mind your fingers. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!
Phone sensors
Note: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and GPS.
Thermal limits
Do not overheat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Do not drill into magnets
Powder created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Avoid contact if allergic
Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease working with magnets and wear gloves.
Cards and drives
Data protection: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, timepieces).
Conscious usage
Handle magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and respect their force.
Danger to pacemakers
People with a heart stimulator must maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.
Magnet fragility
Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.
