MW 20x1.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010039
GTIN/EAN: 5906301810384
Diameter Ø
20 mm [±0,1 mm]
Height
1.5 mm [±0,1 mm]
Weight
3.53 g
Magnetization Direction
↑ axial
Load capacity
0.97 kg / 9.50 N
Magnetic Induction
91.96 mT / 920 Gs
Coating
[NiCuNi] Nickel
1.574 ZŁ with VAT / pcs + price for transport
1.280 ZŁ net + 23% VAT / pcs
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Physical properties - MW 20x1.5 / N38 - cylindrical magnet
Specification / characteristics - MW 20x1.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010039 |
| GTIN/EAN | 5906301810384 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±0,1 mm] |
| Height | 1.5 mm [±0,1 mm] |
| Weight | 3.53 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.97 kg / 9.50 N |
| Magnetic Induction ~ ? | 91.96 mT / 920 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 magnet - data
These data constitute the outcome of a physical simulation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.
Table 1: Static force (pull vs gap) - characteristics
MW 20x1.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
920 Gs
92.0 mT
|
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
|
low risk |
| 1 mm |
887 Gs
88.7 mT
|
0.90 kg / 1.99 lbs
902.2 g / 8.9 N
|
low risk |
| 2 mm |
832 Gs
83.2 mT
|
0.79 kg / 1.75 lbs
794.6 g / 7.8 N
|
low risk |
| 3 mm |
763 Gs
76.3 mT
|
0.67 kg / 1.47 lbs
667.4 g / 6.5 N
|
low risk |
| 5 mm |
606 Gs
60.6 mT
|
0.42 kg / 0.93 lbs
421.6 g / 4.1 N
|
low risk |
| 10 mm |
294 Gs
29.4 mT
|
0.10 kg / 0.22 lbs
99.5 g / 1.0 N
|
low risk |
| 15 mm |
144 Gs
14.4 mT
|
0.02 kg / 0.05 lbs
23.6 g / 0.2 N
|
low risk |
| 20 mm |
76 Gs
7.6 mT
|
0.01 kg / 0.01 lbs
6.7 g / 0.1 N
|
low risk |
| 30 mm |
28 Gs
2.8 mT
|
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
|
low risk |
| 50 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
low risk |
Table 2: Slippage hold (wall)
MW 20x1.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.19 kg / 0.43 lbs
194.0 g / 1.9 N
|
| 1 mm | Stal (~0.2) |
0.18 kg / 0.40 lbs
180.0 g / 1.8 N
|
| 2 mm | Stal (~0.2) |
0.16 kg / 0.35 lbs
158.0 g / 1.5 N
|
| 3 mm | Stal (~0.2) |
0.13 kg / 0.30 lbs
134.0 g / 1.3 N
|
| 5 mm | Stal (~0.2) |
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| 10 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
20.0 g / 0.2 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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 20x1.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.29 kg / 0.64 lbs
291.0 g / 2.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.19 kg / 0.43 lbs
194.0 g / 1.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.10 kg / 0.21 lbs
97.0 g / 1.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.49 kg / 1.07 lbs
485.0 g / 4.8 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 20x1.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.10 kg / 0.21 lbs
97.0 g / 1.0 N
|
| 1 mm |
|
0.24 kg / 0.53 lbs
242.5 g / 2.4 N
|
| 2 mm |
|
0.49 kg / 1.07 lbs
485.0 g / 4.8 N
|
| 3 mm |
|
0.73 kg / 1.60 lbs
727.5 g / 7.1 N
|
| 5 mm |
|
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
|
| 10 mm |
|
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
|
| 11 mm |
|
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
|
| 12 mm |
|
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
|
Table 5: Working in heat (material behavior) - power drop
MW 20x1.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
|
OK |
| 40 °C | -2.2% |
0.95 kg / 2.09 lbs
948.7 g / 9.3 N
|
OK |
| 60 °C | -4.4% |
0.93 kg / 2.04 lbs
927.3 g / 9.1 N
|
|
| 80 °C | -6.6% |
0.91 kg / 2.00 lbs
906.0 g / 8.9 N
|
|
| 100 °C | -28.8% |
0.69 kg / 1.52 lbs
690.6 g / 6.8 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 20x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.64 kg / 3.61 lbs
1 781 Gs
|
0.25 kg / 0.54 lbs
246 g / 2.4 N
|
N/A |
| 1 mm |
1.59 kg / 3.51 lbs
1 813 Gs
|
0.24 kg / 0.53 lbs
239 g / 2.3 N
|
1.43 kg / 3.16 lbs
~0 Gs
|
| 2 mm |
1.52 kg / 3.36 lbs
1 774 Gs
|
0.23 kg / 0.50 lbs
228 g / 2.2 N
|
1.37 kg / 3.02 lbs
~0 Gs
|
| 3 mm |
1.44 kg / 3.17 lbs
1 724 Gs
|
0.22 kg / 0.48 lbs
216 g / 2.1 N
|
1.29 kg / 2.85 lbs
~0 Gs
|
| 5 mm |
1.24 kg / 2.73 lbs
1 598 Gs
|
0.19 kg / 0.41 lbs
185 g / 1.8 N
|
1.11 kg / 2.45 lbs
~0 Gs
|
| 10 mm |
0.71 kg / 1.57 lbs
1 212 Gs
|
0.11 kg / 0.24 lbs
107 g / 1.0 N
|
0.64 kg / 1.41 lbs
~0 Gs
|
| 20 mm |
0.17 kg / 0.37 lbs
589 Gs
|
0.03 kg / 0.06 lbs
25 g / 0.2 N
|
0.15 kg / 0.33 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 lbs
88 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
55 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
36 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
25 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
18 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
13 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 20x1.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 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 (cracking risk) - warning
MW 20x1.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.76 km/h
(4.93 m/s)
|
0.04 J | |
| 30 mm |
28.97 km/h
(8.05 m/s)
|
0.11 J | |
| 50 mm |
37.38 km/h
(10.38 m/s)
|
0.19 J | |
| 100 mm |
52.87 km/h
(14.69 m/s)
|
0.38 J |
Table 9: Anti-corrosion coating durability
MW 20x1.5 / 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: Construction data (Pc)
MW 20x1.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 979 Mx | 39.8 µWb |
| Pc Coefficient | 0.12 | Low (Flat) |
Table 11: Physics of underwater searching
MW 20x1.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.97 kg | Standard |
| Water (riverbed) |
1.11 kg
(+0.14 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet holds merely ~20% of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.12
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Strengths and weaknesses of rare earth magnets.
Pros
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (in laboratory conditions),
- They do not lose their magnetic properties even under external field action,
- Thanks to the smooth finish, the surface of nickel, gold, or silver gives an professional appearance,
- Magnetic induction on the surface of the magnet is exceptional,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
- Thanks to versatility in shaping and the capacity to modify to client solutions,
- Significant place in innovative solutions – they are utilized in HDD drives, motor assemblies, precision medical tools, also complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices
Weaknesses
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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 very resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- Due to limitations in creating threads and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Magnetic strength at its maximum – what it depends on?
- with the use of a sheet made of special test steel, ensuring maximum field concentration
- with a thickness no less than 10 mm
- with an ground contact surface
- with total lack of distance (no coatings)
- for force acting at a right angle (pull-off, not shear)
- at ambient temperature room level
Magnet lifting force in use – key factors
- Distance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
- Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
- Operating temperature – NdFeB sinters 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 was determined by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Safety rules for work with neodymium magnets
Material brittleness
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Do not give to children
Product intended for adults. Small elements pose a choking risk, leading to intestinal necrosis. Keep out of reach of children and animals.
Health Danger
People with a heart stimulator have to maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.
Safe distance
Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.
Skin irritation risks
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.
Dust is flammable
Powder produced during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Powerful field
Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.
Pinching danger
Large magnets can smash fingers in a fraction of a second. Do not put your hand between two strong magnets.
Impact on smartphones
GPS units and mobile phones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the internal compass in your phone.
Operating temperature
Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.
