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
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
12.87 zł net / pcs
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Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
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 details - 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 |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 modeling of the magnet - data
These values are the result of a engineering analysis. Results rely on algorithms for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide for designers.
Table 1: Static pull force (pull vs distance) - interaction chart
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 pounds
5090.0 g / 49.9 N
|
strong |
| 1 mm |
1103 Gs
110.3 mT
|
4.91 kg / 10.82 pounds
4910.1 g / 48.2 N
|
strong |
| 2 mm |
1075 Gs
107.5 mT
|
4.66 kg / 10.28 pounds
4663.0 g / 45.7 N
|
strong |
| 3 mm |
1040 Gs
104.0 mT
|
4.36 kg / 9.62 pounds
4364.2 g / 42.8 N
|
strong |
| 5 mm |
954 Gs
95.4 mT
|
3.67 kg / 8.10 pounds
3673.1 g / 36.0 N
|
strong |
| 10 mm |
703 Gs
70.3 mT
|
2.00 kg / 4.40 pounds
1997.1 g / 19.6 N
|
weak grip |
| 15 mm |
483 Gs
48.3 mT
|
0.94 kg / 2.08 pounds
943.2 g / 9.3 N
|
weak grip |
| 20 mm |
326 Gs
32.6 mT
|
0.43 kg / 0.95 pounds
429.7 g / 4.2 N
|
weak grip |
| 30 mm |
155 Gs
15.5 mT
|
0.10 kg / 0.21 pounds
97.1 g / 1.0 N
|
weak grip |
| 50 mm |
47 Gs
4.7 mT
|
0.01 kg / 0.02 pounds
8.9 g / 0.1 N
|
weak grip |
Table 2: Slippage load (vertical surface)
MW 38x3.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.02 kg / 2.24 pounds
1018.0 g / 10.0 N
|
| 1 mm | Stal (~0.2) |
0.98 kg / 2.16 pounds
982.0 g / 9.6 N
|
| 2 mm | Stal (~0.2) |
0.93 kg / 2.05 pounds
932.0 g / 9.1 N
|
| 3 mm | Stal (~0.2) |
0.87 kg / 1.92 pounds
872.0 g / 8.6 N
|
| 5 mm | Stal (~0.2) |
0.73 kg / 1.62 pounds
734.0 g / 7.2 N
|
| 10 mm | Stal (~0.2) |
0.40 kg / 0.88 pounds
400.0 g / 3.9 N
|
| 15 mm | Stal (~0.2) |
0.19 kg / 0.41 pounds
188.0 g / 1.8 N
|
| 20 mm | Stal (~0.2) |
0.09 kg / 0.19 pounds
86.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
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 pounds
1527.0 g / 15.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.02 kg / 2.24 pounds
1018.0 g / 10.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.51 kg / 1.12 pounds
509.0 g / 5.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.55 kg / 5.61 pounds
2545.0 g / 25.0 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 38x3.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.51 kg / 1.12 pounds
509.0 g / 5.0 N
|
| 1 mm |
|
1.27 kg / 2.81 pounds
1272.5 g / 12.5 N
|
| 2 mm |
|
2.55 kg / 5.61 pounds
2545.0 g / 25.0 N
|
| 3 mm |
|
3.82 kg / 8.42 pounds
3817.5 g / 37.4 N
|
| 5 mm |
|
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
|
| 10 mm |
|
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
|
| 11 mm |
|
5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
|
| 12 mm |
|
5.09 kg / 11.22 pounds
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 pounds
5090.0 g / 49.9 N
|
OK |
| 40 °C | -2.2% |
4.98 kg / 10.97 pounds
4978.0 g / 48.8 N
|
OK |
| 60 °C | -4.4% |
4.87 kg / 10.73 pounds
4866.0 g / 47.7 N
|
|
| 80 °C | -6.6% |
4.75 kg / 10.48 pounds
4754.1 g / 46.6 N
|
|
| 100 °C | -28.8% |
3.62 kg / 7.99 pounds
3624.1 g / 35.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 38x3.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
8.82 kg / 19.44 pounds
2 143 Gs
|
1.32 kg / 2.92 pounds
1323 g / 13.0 N
|
N/A |
| 1 mm |
8.68 kg / 19.13 pounds
2 228 Gs
|
1.30 kg / 2.87 pounds
1302 g / 12.8 N
|
7.81 kg / 17.22 pounds
~0 Gs
|
| 2 mm |
8.51 kg / 18.75 pounds
2 206 Gs
|
1.28 kg / 2.81 pounds
1276 g / 12.5 N
|
7.66 kg / 16.88 pounds
~0 Gs
|
| 3 mm |
8.31 kg / 18.31 pounds
2 180 Gs
|
1.25 kg / 2.75 pounds
1246 g / 12.2 N
|
7.47 kg / 16.48 pounds
~0 Gs
|
| 5 mm |
7.83 kg / 17.26 pounds
2 116 Gs
|
1.17 kg / 2.59 pounds
1174 g / 11.5 N
|
7.05 kg / 15.53 pounds
~0 Gs
|
| 10 mm |
6.36 kg / 14.03 pounds
1 908 Gs
|
0.95 kg / 2.10 pounds
955 g / 9.4 N
|
5.73 kg / 12.63 pounds
~0 Gs
|
| 20 mm |
3.46 kg / 7.63 pounds
1 407 Gs
|
0.52 kg / 1.14 pounds
519 g / 5.1 N
|
3.11 kg / 6.87 pounds
~0 Gs
|
| 50 mm |
0.35 kg / 0.76 pounds
445 Gs
|
0.05 kg / 0.11 pounds
52 g / 0.5 N
|
0.31 kg / 0.69 pounds
~0 Gs
|
| 60 mm |
0.17 kg / 0.37 pounds
310 Gs
|
0.03 kg / 0.06 pounds
25 g / 0.2 N
|
0.15 kg / 0.33 pounds
~0 Gs
|
| 70 mm |
0.09 kg / 0.19 pounds
222 Gs
|
0.01 kg / 0.03 pounds
13 g / 0.1 N
|
0.08 kg / 0.17 pounds
~0 Gs
|
| 80 mm |
0.05 kg / 0.10 pounds
163 Gs
|
0.01 kg / 0.02 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 90 mm |
0.03 kg / 0.06 pounds
122 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 100 mm |
0.02 kg / 0.03 pounds
94 Gs
|
0.00 kg / 0.01 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
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 |
| Car key | 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: Collisions (kinetic energy) - warning
MW 38x3.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.62 km/h
(4.90 m/s)
|
0.36 J | |
| 30 mm |
20.44 km/h
(5.68 m/s)
|
0.48 J | |
| 50 mm |
20.58 km/h
(5.72 m/s)
|
0.49 J | |
| 100 mm |
20.60 km/h
(5.72 m/s)
|
0.49 J |
Table 9: Anti-corrosion coating durability
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: Construction data (Flux)
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: Physics of underwater searching
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. Wall mount (shear)
*Warning: On a vertical surface, the magnet holds just a fraction of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Heat tolerance
*For N38 material, 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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also products
Advantages and disadvantages of Nd2Fe14B magnets.
Advantages
- Their strength is maintained, and after around ten years it drops only by ~1% (theoretically),
- They maintain their magnetic properties even under close interference source,
- In other words, due to the aesthetic surface of gold, the element becomes visually attractive,
- Neodymium magnets ensure maximum magnetic induction on a contact point, 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 shape) even at a temperature of 230°C or more...
- Thanks to versatility in designing and the ability to customize to complex applications,
- Key role in innovative solutions – they find application in mass storage devices, electromotive mechanisms, precision medical tools, also industrial machines.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- At very strong impacts they can break, therefore we recommend 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 durability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
- Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Magnetic strength at its maximum – what contributes to it?
- using a base made of mild steel, serving as a circuit closing element
- possessing a thickness of at least 10 mm to avoid saturation
- with a plane free of scratches
- with direct contact (without impurities)
- for force acting at a right angle (in the magnet axis)
- in neutral thermal conditions
Practical lifting capacity: influencing factors
- Distance (betwixt the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
- Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
- Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.
Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.
Safe handling of neodymium magnets
Safe distance
Do not bring magnets close to a purse, computer, or TV. The magnetism can destroy these devices and wipe information from cards.
Immense force
Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.
Skin irritation risks
Medical facts indicate that nickel (the usual finish) is a common allergen. If your skin reacts to metals, avoid direct skin contact and opt for encased magnets.
Dust explosion hazard
Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.
Precision electronics
A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.
Magnet fragility
Protect your eyes. Magnets can fracture upon violent connection, ejecting shards into the air. Wear goggles.
Medical interference
Patients with a ICD must maintain an large gap from magnets. The magnetism can stop the functioning of the life-saving device.
Bone fractures
Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Maximum temperature
Keep cool. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).
This is not a toy
Neodymium magnets are not toys. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which poses a direct threat to life and requires immediate surgery.
