MW 38x3.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010062
GTIN/EAN: 5906301810612
Diameter Ø
38 mm [±0,1 mm]
Height
3.5 mm [±0,1 mm]
Weight
29.77 g
Magnetization Direction
↑ axial
Load capacity
5.09 kg / 49.91 N
Magnetic Induction
112.31 mT / 1123 Gs
Coating
[NiCuNi] Nickel
15.83 ZŁ with VAT / pcs + price for transport
12.87 ZŁ net + 23% VAT / pcs
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Technical - MW 38x3.5 / N38 - cylindrical magnet
Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010062 |
| GTIN/EAN | 5906301810612 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 38 mm [±0,1 mm] |
| Height | 3.5 mm [±0,1 mm] |
| Weight | 29.77 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 5.09 kg / 49.91 N |
| Magnetic Induction ~ ? | 112.31 mT / 1123 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 |
Technical simulation of the assembly - data
Presented values represent the result of a physical simulation. Results were calculated on models for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Treat these data as a reference point for designers.
Table 1: Static force (force vs distance) - power drop
MW 38x3.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1123 Gs
112.3 mT
|
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
|
medium risk |
| 1 mm |
1103 Gs
110.3 mT
|
4.91 kg / 10.82 lbs
4910.1 g / 48.2 N
|
medium risk |
| 2 mm |
1075 Gs
107.5 mT
|
4.66 kg / 10.28 lbs
4663.0 g / 45.7 N
|
medium risk |
| 3 mm |
1040 Gs
104.0 mT
|
4.36 kg / 9.62 lbs
4364.2 g / 42.8 N
|
medium risk |
| 5 mm |
954 Gs
95.4 mT
|
3.67 kg / 8.10 lbs
3673.1 g / 36.0 N
|
medium risk |
| 10 mm |
703 Gs
70.3 mT
|
2.00 kg / 4.40 lbs
1997.1 g / 19.6 N
|
low risk |
| 15 mm |
483 Gs
48.3 mT
|
0.94 kg / 2.08 lbs
943.2 g / 9.3 N
|
low risk |
| 20 mm |
326 Gs
32.6 mT
|
0.43 kg / 0.95 lbs
429.7 g / 4.2 N
|
low risk |
| 30 mm |
155 Gs
15.5 mT
|
0.10 kg / 0.21 lbs
97.1 g / 1.0 N
|
low risk |
| 50 mm |
47 Gs
4.7 mT
|
0.01 kg / 0.02 lbs
8.9 g / 0.1 N
|
low risk |
Table 2: Slippage force (wall)
MW 38x3.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
|
| 1 mm | Stal (~0.2) |
0.98 kg / 2.16 lbs
982.0 g / 9.6 N
|
| 2 mm | Stal (~0.2) |
0.93 kg / 2.05 lbs
932.0 g / 9.1 N
|
| 3 mm | Stal (~0.2) |
0.87 kg / 1.92 lbs
872.0 g / 8.6 N
|
| 5 mm | Stal (~0.2) |
0.73 kg / 1.62 lbs
734.0 g / 7.2 N
|
| 10 mm | Stal (~0.2) |
0.40 kg / 0.88 lbs
400.0 g / 3.9 N
|
| 15 mm | Stal (~0.2) |
0.19 kg / 0.41 lbs
188.0 g / 1.8 N
|
| 20 mm | Stal (~0.2) |
0.09 kg / 0.19 lbs
86.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
20.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - vertical pull
MW 38x3.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.53 kg / 3.37 lbs
1527.0 g / 15.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.51 kg / 1.12 lbs
509.0 g / 5.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.55 kg / 5.61 lbs
2545.0 g / 25.0 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 38x3.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.51 kg / 1.12 lbs
509.0 g / 5.0 N
|
| 1 mm |
|
1.27 kg / 2.81 lbs
1272.5 g / 12.5 N
|
| 2 mm |
|
2.55 kg / 5.61 lbs
2545.0 g / 25.0 N
|
| 3 mm |
|
3.82 kg / 8.42 lbs
3817.5 g / 37.4 N
|
| 5 mm |
|
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
|
| 10 mm |
|
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
|
| 11 mm |
|
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
|
| 12 mm |
|
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
|
Table 5: Working in heat (stability) - thermal limit
MW 38x3.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
|
OK |
| 40 °C | -2.2% |
4.98 kg / 10.97 lbs
4978.0 g / 48.8 N
|
OK |
| 60 °C | -4.4% |
4.87 kg / 10.73 lbs
4866.0 g / 47.7 N
|
|
| 80 °C | -6.6% |
4.75 kg / 10.48 lbs
4754.1 g / 46.6 N
|
|
| 100 °C | -28.8% |
3.62 kg / 7.99 lbs
3624.1 g / 35.6 N
|
Table 6: Two magnets (attraction) - field collision
MW 38x3.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
8.82 kg / 19.44 lbs
2 143 Gs
|
1.32 kg / 2.92 lbs
1323 g / 13.0 N
|
N/A |
| 1 mm |
8.68 kg / 19.13 lbs
2 228 Gs
|
1.30 kg / 2.87 lbs
1302 g / 12.8 N
|
7.81 kg / 17.22 lbs
~0 Gs
|
| 2 mm |
8.51 kg / 18.75 lbs
2 206 Gs
|
1.28 kg / 2.81 lbs
1276 g / 12.5 N
|
7.66 kg / 16.88 lbs
~0 Gs
|
| 3 mm |
8.31 kg / 18.31 lbs
2 180 Gs
|
1.25 kg / 2.75 lbs
1246 g / 12.2 N
|
7.47 kg / 16.48 lbs
~0 Gs
|
| 5 mm |
7.83 kg / 17.26 lbs
2 116 Gs
|
1.17 kg / 2.59 lbs
1174 g / 11.5 N
|
7.05 kg / 15.53 lbs
~0 Gs
|
| 10 mm |
6.36 kg / 14.03 lbs
1 908 Gs
|
0.95 kg / 2.10 lbs
955 g / 9.4 N
|
5.73 kg / 12.63 lbs
~0 Gs
|
| 20 mm |
3.46 kg / 7.63 lbs
1 407 Gs
|
0.52 kg / 1.14 lbs
519 g / 5.1 N
|
3.11 kg / 6.87 lbs
~0 Gs
|
| 50 mm |
0.35 kg / 0.76 lbs
445 Gs
|
0.05 kg / 0.11 lbs
52 g / 0.5 N
|
0.31 kg / 0.69 lbs
~0 Gs
|
| 60 mm |
0.17 kg / 0.37 lbs
310 Gs
|
0.03 kg / 0.06 lbs
25 g / 0.2 N
|
0.15 kg / 0.33 lbs
~0 Gs
|
| 70 mm |
0.09 kg / 0.19 lbs
222 Gs
|
0.01 kg / 0.03 lbs
13 g / 0.1 N
|
0.08 kg / 0.17 lbs
~0 Gs
|
| 80 mm |
0.05 kg / 0.10 lbs
163 Gs
|
0.01 kg / 0.02 lbs
7 g / 0.1 N
|
0.04 kg / 0.09 lbs
~0 Gs
|
| 90 mm |
0.03 kg / 0.06 lbs
122 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.02 kg / 0.05 lbs
~0 Gs
|
| 100 mm |
0.02 kg / 0.03 lbs
94 Gs
|
0.00 kg / 0.01 lbs
2 g / 0.0 N
|
0.01 kg / 0.03 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MW 38x3.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 7.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 5.5 cm |
| Remote | 50 Gs (5.0 mT) | 5.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 38x3.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.10 km/h
(4.47 m/s)
|
0.30 J | |
| 30 mm |
23.11 km/h
(6.42 m/s)
|
0.61 J | |
| 50 mm |
29.52 km/h
(8.20 m/s)
|
1.00 J | |
| 100 mm |
41.70 km/h
(11.58 m/s)
|
2.00 J |
Table 9: Corrosion resistance
MW 38x3.5 / 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: Electrical data (Pc)
MW 38x3.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 17 022 Mx | 170.2 µWb |
| Pc Coefficient | 0.14 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 38x3.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 5.09 kg | Standard |
| Water (riverbed) |
5.83 kg
(+0.74 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet holds just a fraction of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.
3. Thermal stability
*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) = 0.14
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages and disadvantages of neodymium magnets.
Advantages
- They do not lose power, even after around ten years – the drop in lifting capacity is only ~1% (based on measurements),
- They have excellent resistance to magnetism drop as a result of external fields,
- Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold, or silver gives an professional appearance,
- Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Possibility of individual machining as well as modifying to atypical applications,
- Universal use in innovative solutions – they are utilized in mass storage devices, motor assemblies, advanced medical instruments, and modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their 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 suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Limited possibility of making nuts in the magnet and complicated shapes - preferred is cover - magnet mounting.
- Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these products can disrupt the diagnostic process medical after entering the body.
- Due to complex production process, their price is relatively high,
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what affects it?
- on a block made of structural steel, effectively closing the magnetic flux
- with a thickness minimum 10 mm
- with a plane free of scratches
- under conditions of gap-free contact (surface-to-surface)
- under vertical force direction (90-degree angle)
- at conditions approx. 20°C
Magnet lifting force in use – key factors
- Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
- Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – insufficiently thick sheet does not close the flux, causing part of the power to be escaped into the air.
- Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate decreases the holding force.
Safety rules for work with neodymium magnets
Dust explosion hazard
Powder produced during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Do not underestimate power
Be careful. Rare earth magnets attract from a long distance and snap with massive power, often quicker than you can move away.
Protect data
Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.
Swallowing risk
Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.
Finger safety
Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Thermal limits
Keep cool. NdFeB magnets are susceptible to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).
Implant safety
For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to handle the magnets.
Magnetic interference
Navigation devices and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Eye protection
Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them breaking into shards.
Metal Allergy
Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop handling magnets and use protective gear.
