MW 10x20 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010007
GTIN/EAN: 5906301810063
Diameter Ø
10 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
11.78 g
Magnetization Direction
↑ axial
Load capacity
2.23 kg / 21.88 N
Magnetic Induction
600.73 mT / 6007 Gs
Coating
[NiCuNi] Nickel
4.92 ZŁ with VAT / pcs + price for transport
4.00 ZŁ net + 23% VAT / pcs
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Technical data - MW 10x20 / N38 - cylindrical magnet
Specification / characteristics - MW 10x20 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010007 |
| GTIN/EAN | 5906301810063 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 10 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 11.78 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.23 kg / 21.88 N |
| Magnetic Induction ~ ? | 600.73 mT / 6007 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 magnet - data
Presented information represent the direct effect of a engineering calculation. Values rely on algorithms for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs gap) - characteristics
MW 10x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6003 Gs
600.3 mT
|
2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
|
warning |
| 1 mm |
4815 Gs
481.5 mT
|
1.44 kg / 3.16 LBS
1435.1 g / 14.1 N
|
low risk |
| 2 mm |
3743 Gs
374.3 mT
|
0.87 kg / 1.91 LBS
867.2 g / 8.5 N
|
low risk |
| 3 mm |
2869 Gs
286.9 mT
|
0.51 kg / 1.12 LBS
509.3 g / 5.0 N
|
low risk |
| 5 mm |
1696 Gs
169.6 mT
|
0.18 kg / 0.39 LBS
177.9 g / 1.7 N
|
low risk |
| 10 mm |
570 Gs
57.0 mT
|
0.02 kg / 0.04 LBS
20.1 g / 0.2 N
|
low risk |
| 15 mm |
256 Gs
25.6 mT
|
0.00 kg / 0.01 LBS
4.1 g / 0.0 N
|
low risk |
| 20 mm |
137 Gs
13.7 mT
|
0.00 kg / 0.00 LBS
1.2 g / 0.0 N
|
low risk |
| 30 mm |
54 Gs
5.4 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
low risk |
| 50 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical capacity (wall)
MW 10x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.45 kg / 0.98 LBS
446.0 g / 4.4 N
|
| 1 mm | Stal (~0.2) |
0.29 kg / 0.63 LBS
288.0 g / 2.8 N
|
| 2 mm | Stal (~0.2) |
0.17 kg / 0.38 LBS
174.0 g / 1.7 N
|
| 3 mm | Stal (~0.2) |
0.10 kg / 0.22 LBS
102.0 g / 1.0 N
|
| 5 mm | Stal (~0.2) |
0.04 kg / 0.08 LBS
36.0 g / 0.4 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 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 (sliding) - behavior on slippery surfaces
MW 10x20 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.67 kg / 1.47 LBS
669.0 g / 6.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.45 kg / 0.98 LBS
446.0 g / 4.4 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.22 kg / 0.49 LBS
223.0 g / 2.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.12 kg / 2.46 LBS
1115.0 g / 10.9 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 10x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.22 kg / 0.49 LBS
223.0 g / 2.2 N
|
| 1 mm |
|
0.56 kg / 1.23 LBS
557.5 g / 5.5 N
|
| 2 mm |
|
1.12 kg / 2.46 LBS
1115.0 g / 10.9 N
|
| 3 mm |
|
1.67 kg / 3.69 LBS
1672.5 g / 16.4 N
|
| 5 mm |
|
2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
|
| 10 mm |
|
2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
|
| 11 mm |
|
2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
|
| 12 mm |
|
2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
|
Table 5: Thermal resistance (material behavior) - power drop
MW 10x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
|
OK |
| 40 °C | -2.2% |
2.18 kg / 4.81 LBS
2180.9 g / 21.4 N
|
OK |
| 60 °C | -4.4% |
2.13 kg / 4.70 LBS
2131.9 g / 20.9 N
|
OK |
| 80 °C | -6.6% |
2.08 kg / 4.59 LBS
2082.8 g / 20.4 N
|
|
| 100 °C | -28.8% |
1.59 kg / 3.50 LBS
1587.8 g / 15.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 10x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
17.45 kg / 38.46 LBS
6 140 Gs
|
2.62 kg / 5.77 LBS
2617 g / 25.7 N
|
N/A |
| 1 mm |
14.15 kg / 31.20 LBS
10 813 Gs
|
2.12 kg / 4.68 LBS
2123 g / 20.8 N
|
12.74 kg / 28.08 LBS
~0 Gs
|
| 2 mm |
11.23 kg / 24.75 LBS
9 631 Gs
|
1.68 kg / 3.71 LBS
1684 g / 16.5 N
|
10.11 kg / 22.28 LBS
~0 Gs
|
| 3 mm |
8.78 kg / 19.35 LBS
8 515 Gs
|
1.32 kg / 2.90 LBS
1316 g / 12.9 N
|
7.90 kg / 17.41 LBS
~0 Gs
|
| 5 mm |
5.21 kg / 11.48 LBS
6 559 Gs
|
0.78 kg / 1.72 LBS
781 g / 7.7 N
|
4.69 kg / 10.33 LBS
~0 Gs
|
| 10 mm |
1.39 kg / 3.07 LBS
3 391 Gs
|
0.21 kg / 0.46 LBS
209 g / 2.0 N
|
1.25 kg / 2.76 LBS
~0 Gs
|
| 20 mm |
0.16 kg / 0.35 LBS
1 140 Gs
|
0.02 kg / 0.05 LBS
24 g / 0.2 N
|
0.14 kg / 0.31 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 LBS
165 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
107 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
74 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
53 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
39 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
30 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 10x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.5 cm |
| Car key | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (cracking risk) - collision effects
MW 10x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
13.95 km/h
(3.88 m/s)
|
0.09 J | |
| 30 mm |
24.03 km/h
(6.68 m/s)
|
0.26 J | |
| 50 mm |
31.03 km/h
(8.62 m/s)
|
0.44 J | |
| 100 mm |
43.88 km/h
(12.19 m/s)
|
0.88 J |
Table 9: Anti-corrosion coating durability
MW 10x20 / 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 10x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 223 Mx | 52.2 µWb |
| Pc Coefficient | 1.21 | High (Stable) |
Table 11: Physics of underwater searching
MW 10x20 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.23 kg | Standard |
| Water (riverbed) |
2.55 kg
(+0.32 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC 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) = 1.21
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.
Chemical composition
| 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 |
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Advantages and disadvantages of neodymium magnets.
Pros
- Their strength remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
- They are extremely resistant to demagnetization induced by presence of other magnetic fields,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Magnets have extremely high magnetic induction on the surface,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
- Possibility of accurate creating as well as adapting to concrete needs,
- Key role in advanced technology sectors – they find application in hard drives, drive modules, medical devices, also complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices
Disadvantages
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- Due to limitations in realizing threads and complex forms in magnets, we propose using a housing - magnetic mount.
- Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum holding power of the magnet – what it depends on?
- using a sheet made of high-permeability steel, acting as a circuit closing element
- with a cross-section minimum 10 mm
- with a plane perfectly flat
- with direct contact (without impurities)
- for force acting at a right angle (pull-off, not shear)
- in neutral thermal conditions
Practical aspects of lifting capacity – factors
- Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
- Base massiveness – too thin plate causes magnetic saturation, causing part of the flux to be escaped into the air.
- Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
- Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
- Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
Safety rules for work with neodymium magnets
Conscious usage
Handle magnets with awareness. Their huge power can surprise even experienced users. Stay alert and respect their power.
Danger to pacemakers
Individuals with a heart stimulator should maintain an safe separation from magnets. The magnetism can interfere with the operation of the implant.
Phone sensors
Remember: rare earth magnets generate a field that confuses sensitive sensors. Keep a separation from your phone, tablet, and navigation systems.
Choking Hazard
Absolutely store magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are very dangerous.
Machining danger
Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.
Heat warning
Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.
Beware of splinters
Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
Bodily injuries
Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.
Electronic devices
Powerful magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.
Allergic reactions
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness happens, cease working with magnets and use protective gear.
