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 data of the product - 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 |
Engineering simulation of the magnet - technical parameters
The following information are the outcome of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a preliminary roadmap for designers.
Table 1: Static pull force (pull 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
|
strong |
| 1 mm |
1103 Gs
110.3 mT
|
4.91 kg / 10.82 lbs
4910.1 g / 48.2 N
|
strong |
| 2 mm |
1075 Gs
107.5 mT
|
4.66 kg / 10.28 lbs
4663.0 g / 45.7 N
|
strong |
| 3 mm |
1040 Gs
104.0 mT
|
4.36 kg / 9.62 lbs
4364.2 g / 42.8 N
|
strong |
| 5 mm |
954 Gs
95.4 mT
|
3.67 kg / 8.10 lbs
3673.1 g / 36.0 N
|
strong |
| 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 capacity (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: Vertical assembly (sliding) - 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: Steel thickness (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: Thermal resistance (material behavior) - 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 range
MW 38x3.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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 (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 |
| Mobile device | 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: Collisions (cracking risk) - 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: Coating parameters (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 (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. Shear force
*Note: On a vertical wall, the magnet holds just a fraction of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically reduces the holding force.
3. Heat tolerance
*For N38 material, the critical 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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also proposals
Strengths and weaknesses of Nd2Fe14B magnets.
Benefits
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
- They maintain their magnetic properties even under strong external field,
- By applying a lustrous coating of nickel, the element gains an aesthetic look,
- Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
- Neodymium magnets are characterized by extremely 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 detailed creating as well as modifying to individual needs,
- Universal use in innovative solutions – they are commonly used in data components, brushless drives, medical devices, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems
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 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
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We recommend cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
- Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical after entering the body.
- Due to expensive raw materials, their price is higher than average,
Pull force analysis
Detachment force of the magnet in optimal conditions – what affects it?
- using a base made of low-carbon steel, functioning as a ideal flux conductor
- whose thickness reaches at least 10 mm
- characterized by even structure
- with direct contact (no paint)
- during pulling in a direction vertical to the plane
- at room temperature
Practical aspects of lifting capacity – factors
- Clearance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
- Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Do not underestimate power
Use magnets consciously. Their huge power can surprise even professionals. Be vigilant and respect their power.
Thermal limits
Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.
Fire warning
Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.
Allergic reactions
Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or choose versions in plastic housing.
Life threat
Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.
Magnets are brittle
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Cards and drives
Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).
Adults only
Absolutely store magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are fatal.
Phone sensors
Navigation devices and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.
Bone fractures
Risk of injury: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
