MW 7x1.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010393
GTIN/EAN: 5906301811091
Diameter Ø
7 mm [±0,1 mm]
Height
1.5 mm [±0,1 mm]
Weight
0.43 g
Magnetization Direction
↑ axial
Load capacity
0.69 kg / 6.75 N
Magnetic Induction
243.98 mT / 2440 Gs
Coating
[NiCuNi] Nickel
0.369 ZŁ with VAT / pcs + price for transport
0.300 ZŁ net + 23% VAT / pcs
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Technical parameters - MW 7x1.5 / N38 - cylindrical magnet
Specification / characteristics - MW 7x1.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010393 |
| GTIN/EAN | 5906301811091 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 7 mm [±0,1 mm] |
| Height | 1.5 mm [±0,1 mm] |
| Weight | 0.43 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.69 kg / 6.75 N |
| Magnetic Induction ~ ? | 243.98 mT / 2440 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
These values constitute the outcome of a physical simulation. Results rely on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these data as a reference point during assembly planning.
Table 1: Static force (force vs distance) - power drop
MW 7x1.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2438 Gs
243.8 mT
|
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
|
weak grip |
| 1 mm |
1900 Gs
190.0 mT
|
0.42 kg / 0.92 lbs
419.1 g / 4.1 N
|
weak grip |
| 2 mm |
1308 Gs
130.8 mT
|
0.20 kg / 0.44 lbs
198.6 g / 1.9 N
|
weak grip |
| 3 mm |
859 Gs
85.9 mT
|
0.09 kg / 0.19 lbs
85.7 g / 0.8 N
|
weak grip |
| 5 mm |
380 Gs
38.0 mT
|
0.02 kg / 0.04 lbs
16.7 g / 0.2 N
|
weak grip |
| 10 mm |
79 Gs
7.9 mT
|
0.00 kg / 0.00 lbs
0.7 g / 0.0 N
|
weak grip |
| 15 mm |
27 Gs
2.7 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
weak grip |
| 20 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Sliding capacity (wall)
MW 7x1.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.14 kg / 0.30 lbs
138.0 g / 1.4 N
|
| 1 mm | Stal (~0.2) |
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| 2 mm | Stal (~0.2) |
0.04 kg / 0.09 lbs
40.0 g / 0.4 N
|
| 3 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
18.0 g / 0.2 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 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: Vertical assembly (shearing) - behavior on slippery surfaces
MW 7x1.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.21 kg / 0.46 lbs
207.0 g / 2.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.14 kg / 0.30 lbs
138.0 g / 1.4 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.15 lbs
69.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.35 kg / 0.76 lbs
345.0 g / 3.4 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 7x1.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.15 lbs
69.0 g / 0.7 N
|
| 1 mm |
|
0.17 kg / 0.38 lbs
172.5 g / 1.7 N
|
| 2 mm |
|
0.35 kg / 0.76 lbs
345.0 g / 3.4 N
|
| 3 mm |
|
0.52 kg / 1.14 lbs
517.5 g / 5.1 N
|
| 5 mm |
|
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
|
| 10 mm |
|
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
|
| 11 mm |
|
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
|
| 12 mm |
|
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MW 7x1.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.69 kg / 1.52 lbs
690.0 g / 6.8 N
|
OK |
| 40 °C | -2.2% |
0.67 kg / 1.49 lbs
674.8 g / 6.6 N
|
OK |
| 60 °C | -4.4% |
0.66 kg / 1.45 lbs
659.6 g / 6.5 N
|
|
| 80 °C | -6.6% |
0.64 kg / 1.42 lbs
644.5 g / 6.3 N
|
|
| 100 °C | -28.8% |
0.49 kg / 1.08 lbs
491.3 g / 4.8 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 7x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.41 kg / 3.11 lbs
4 025 Gs
|
0.21 kg / 0.47 lbs
212 g / 2.1 N
|
N/A |
| 1 mm |
1.15 kg / 2.53 lbs
4 398 Gs
|
0.17 kg / 0.38 lbs
172 g / 1.7 N
|
1.03 kg / 2.28 lbs
~0 Gs
|
| 2 mm |
0.86 kg / 1.89 lbs
3 801 Gs
|
0.13 kg / 0.28 lbs
129 g / 1.3 N
|
0.77 kg / 1.70 lbs
~0 Gs
|
| 3 mm |
0.60 kg / 1.33 lbs
3 185 Gs
|
0.09 kg / 0.20 lbs
90 g / 0.9 N
|
0.54 kg / 1.19 lbs
~0 Gs
|
| 5 mm |
0.27 kg / 0.59 lbs
2 125 Gs
|
0.04 kg / 0.09 lbs
40 g / 0.4 N
|
0.24 kg / 0.53 lbs
~0 Gs
|
| 10 mm |
0.03 kg / 0.08 lbs
759 Gs
|
0.01 kg / 0.01 lbs
5 g / 0.1 N
|
0.03 kg / 0.07 lbs
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 lbs
159 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
13 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
8 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
5 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
3 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
2 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
2 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) - warnings
MW 7x1.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 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) - warning
MW 7x1.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
40.43 km/h
(11.23 m/s)
|
0.03 J | |
| 30 mm |
69.97 km/h
(19.44 m/s)
|
0.08 J | |
| 50 mm |
90.34 km/h
(25.09 m/s)
|
0.14 J | |
| 100 mm |
127.75 km/h
(35.49 m/s)
|
0.27 J |
Table 9: Coating parameters (durability)
MW 7x1.5 / 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 7x1.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 075 Mx | 10.8 µWb |
| Pc Coefficient | 0.31 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 7x1.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.69 kg | Standard |
| Water (riverbed) |
0.79 kg
(+0.10 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. computer case) significantly weakens 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) = 0.31
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 deals
Advantages as well as disadvantages of neodymium magnets.
Advantages
- Their strength is durable, and after approximately ten years it drops only by ~1% (theoretically),
- Neodymium magnets remain remarkably resistant to loss of magnetic properties caused by external field sources,
- In other words, due to the reflective layer of nickel, the element becomes visually attractive,
- The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
- 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 modularity in designing and the ability to adapt to client solutions,
- Key role in modern industrial fields – they serve a role in computer drives, electric drive systems, medical devices, as well as industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in miniature devices
Disadvantages
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
- With budget limitations the cost of neodymium magnets is a challenge,
Pull force analysis
Maximum magnetic pulling force – what it depends on?
- on a plate made of structural steel, effectively closing the magnetic field
- possessing a massiveness of at least 10 mm to avoid saturation
- characterized by lack of roughness
- without any air gap between the magnet and steel
- under axial application of breakaway force (90-degree angle)
- at ambient temperature room level
Determinants of practical lifting force of a magnet
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
- Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
- Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.
Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.
Safety rules for work with NdFeB magnets
Precision electronics
GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Crushing risk
Danger of trauma: The attraction force is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.
Implant safety
People with a heart stimulator should keep an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.
Nickel coating and allergies
Certain individuals have a sensitization to Ni, which is the common plating for NdFeB magnets. Prolonged contact may cause skin redness. We recommend use protective gloves.
Powerful field
Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.
Demagnetization risk
Do not overheat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
Eye protection
Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.
Data carriers
Equipment safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).
Flammability
Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
Product not for children
Absolutely store magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are very dangerous.
