MW 3x1 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010063
GTIN/EAN: 5906301810629
Diameter Ø
3 mm [±0,1 mm]
Height
1 mm [±0,1 mm]
Weight
0.05 g
Magnetization Direction
↑ axial
Load capacity
0.21 kg / 2.10 N
Magnetic Induction
342.82 mT / 3428 Gs
Coating
[NiCuNi] Nickel
0.1353 ZŁ with VAT / pcs + price for transport
0.1100 ZŁ net + 23% VAT / pcs
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Product card - MW 3x1 / N38 - cylindrical magnet
Specification / characteristics - MW 3x1 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010063 |
| GTIN/EAN | 5906301810629 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 3 mm [±0,1 mm] |
| Height | 1 mm [±0,1 mm] |
| Weight | 0.05 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.21 kg / 2.10 N |
| Magnetic Induction ~ ? | 342.82 mT / 3428 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 modeling of the assembly - technical parameters
These values represent the result of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static force (pull vs gap) - interaction chart
MW 3x1 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3422 Gs
342.2 mT
|
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
|
low risk |
| 1 mm |
1521 Gs
152.1 mT
|
0.04 kg / 0.09 LBS
41.5 g / 0.4 N
|
low risk |
| 2 mm |
585 Gs
58.5 mT
|
0.01 kg / 0.01 LBS
6.1 g / 0.1 N
|
low risk |
| 3 mm |
260 Gs
26.0 mT
|
0.00 kg / 0.00 LBS
1.2 g / 0.0 N
|
low risk |
| 5 mm |
76 Gs
7.6 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
low risk |
| 10 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 15 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 20 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Sliding capacity (wall)
MW 3x1 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.04 kg / 0.09 LBS
42.0 g / 0.4 N
|
| 1 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
8.0 g / 0.1 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 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: Wall mounting (shearing) - vertical pull
MW 3x1 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.06 kg / 0.14 LBS
63.0 g / 0.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.04 kg / 0.09 LBS
42.0 g / 0.4 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.02 kg / 0.05 LBS
21.0 g / 0.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.11 kg / 0.23 LBS
105.0 g / 1.0 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 3x1 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.02 kg / 0.05 LBS
21.0 g / 0.2 N
|
| 1 mm |
|
0.05 kg / 0.12 LBS
52.5 g / 0.5 N
|
| 2 mm |
|
0.11 kg / 0.23 LBS
105.0 g / 1.0 N
|
| 3 mm |
|
0.16 kg / 0.35 LBS
157.5 g / 1.5 N
|
| 5 mm |
|
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
|
| 10 mm |
|
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
|
| 11 mm |
|
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
|
| 12 mm |
|
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
|
Table 5: Thermal stability (stability) - power drop
MW 3x1 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
|
OK |
| 40 °C | -2.2% |
0.21 kg / 0.45 LBS
205.4 g / 2.0 N
|
OK |
| 60 °C | -4.4% |
0.20 kg / 0.44 LBS
200.8 g / 2.0 N
|
|
| 80 °C | -6.6% |
0.20 kg / 0.43 LBS
196.1 g / 1.9 N
|
|
| 100 °C | -28.8% |
0.15 kg / 0.33 LBS
149.5 g / 1.5 N
|
Table 6: Two magnets (repulsion) - field collision
MW 3x1 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
0.51 kg / 1.12 LBS
4 928 Gs
|
0.08 kg / 0.17 LBS
77 g / 0.8 N
|
N/A |
| 1 mm |
0.26 kg / 0.56 LBS
4 847 Gs
|
0.04 kg / 0.08 LBS
38 g / 0.4 N
|
0.23 kg / 0.51 LBS
~0 Gs
|
| 2 mm |
0.10 kg / 0.22 LBS
3 042 Gs
|
0.02 kg / 0.03 LBS
15 g / 0.1 N
|
0.09 kg / 0.20 LBS
~0 Gs
|
| 3 mm |
0.04 kg / 0.08 LBS
1 865 Gs
|
0.01 kg / 0.01 LBS
6 g / 0.1 N
|
0.03 kg / 0.08 LBS
~0 Gs
|
| 5 mm |
0.01 kg / 0.01 LBS
764 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 LBS
153 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
23 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
2 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
1 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
1 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
0 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
0 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
0 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MW 3x1 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 1.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 1.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 1.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.0 cm |
| Car key | 50 Gs (5.0 mT) | 1.0 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Collisions (kinetic energy) - collision effects
MW 3x1 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
65.36 km/h
(18.16 m/s)
|
0.01 J | |
| 30 mm |
113.21 km/h
(31.45 m/s)
|
0.02 J | |
| 50 mm |
146.15 km/h
(40.60 m/s)
|
0.04 J | |
| 100 mm |
206.68 km/h
(57.41 m/s)
|
0.08 J |
Table 9: Coating parameters (durability)
MW 3x1 / 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 (Flux)
MW 3x1 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 257 Mx | 2.6 µWb |
| Pc Coefficient | 0.44 | Low (Flat) |
Table 11: Submerged application
MW 3x1 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.21 kg | Standard |
| Water (riverbed) |
0.24 kg
(+0.03 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet retains only a fraction of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Power loss vs temp
*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) = 0.44
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths as well as weaknesses of rare earth magnets.
Strengths
- They do not lose magnetism, even over around ten years – the reduction in strength is only ~1% (according to tests),
- They feature excellent resistance to magnetism drop when exposed to external fields,
- A magnet with a metallic silver surface has an effective appearance,
- They are known for high magnetic induction at the operating surface, which increases their power,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
- Thanks to versatility in shaping and the capacity to customize to complex applications,
- Significant place in future technologies – they are commonly used in hard drives, motor assemblies, medical devices, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems
Disadvantages
- At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Due to limitations in producing threads and complicated forms in magnets, we propose using cover - magnetic mechanism.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a base made of mild steel, optimally conducting the magnetic flux
- with a cross-section minimum 10 mm
- with an ideally smooth touching surface
- under conditions of gap-free contact (metal-to-metal)
- during detachment in a direction perpendicular to the mounting surface
- at ambient temperature approx. 20 degrees Celsius
Key elements affecting lifting force
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Metal type – not every steel reacts the same. High carbon content worsen the attraction effect.
- Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.
Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.
Safety rules for work with NdFeB magnets
Avoid contact if allergic
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, cease working with magnets and use protective gear.
Dust is flammable
Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Warning for heart patients
Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Danger to the youngest
NdFeB magnets are not toys. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which poses a critical condition and requires immediate surgery.
Magnetic interference
A powerful magnetic field interferes with the operation of magnetometers in smartphones and navigation systems. Keep magnets near a smartphone to avoid breaking the sensors.
Demagnetization risk
Avoid heat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).
Magnetic media
Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).
Bodily injuries
Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!
Immense force
Be careful. Neodymium magnets act from a long distance and connect with huge force, often faster than you can react.
Beware of splinters
Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.
