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
bulk discounts:
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Technical specification - 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 |
Physical simulation of the magnet - data
These values constitute the direct effect of a physical analysis. Results are based on algorithms for the material Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull 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
|
low risk |
| 1 mm |
1900 Gs
190.0 mT
|
0.42 kg / 0.92 LBS
419.1 g / 4.1 N
|
low risk |
| 2 mm |
1308 Gs
130.8 mT
|
0.20 kg / 0.44 LBS
198.6 g / 1.9 N
|
low risk |
| 3 mm |
859 Gs
85.9 mT
|
0.09 kg / 0.19 LBS
85.7 g / 0.8 N
|
low risk |
| 5 mm |
380 Gs
38.0 mT
|
0.02 kg / 0.04 LBS
16.7 g / 0.2 N
|
low risk |
| 10 mm |
79 Gs
7.9 mT
|
0.00 kg / 0.00 LBS
0.7 g / 0.0 N
|
low risk |
| 15 mm |
27 Gs
2.7 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
low risk |
| 20 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Slippage 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 (sliding) - 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 (saturation) - power losses
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 stability (stability) - thermal limit
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) - field collision
MW 7x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (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) - precautionary measures
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Remote | 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: Impact energy (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: Corrosion resistance
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: Electrical 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: Hydrostatics and buoyancy
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. Sliding resistance
*Note: On a vertical surface, the magnet retains only a fraction of its max power.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Thermal stability
*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) = 0.31
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Pros and cons of neodymium magnets.
Pros
- Their power is maintained, and after around ten years it decreases only by ~1% (theoretically),
- They are extremely resistant to demagnetization induced by external field influence,
- A magnet with a metallic nickel surface has better aesthetics,
- The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of precise modeling as well as modifying to individual applications,
- Universal use in high-tech industry – they serve a role in data components, motor assemblies, medical devices, also multitasking production systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
- With budget limitations the cost of neodymium magnets is a challenge,
Lifting parameters
Maximum lifting capacity of the magnet – what affects it?
- using a base made of mild steel, acting as a magnetic yoke
- with a thickness of at least 10 mm
- with an polished contact surface
- without any insulating layer between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- in stable room temperature
Impact of factors on magnetic holding capacity in practice
- Gap (betwixt the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.
Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the holding force.
H&S for magnets
Safe operation
Handle magnets with awareness. Their immense force can shock even professionals. Stay alert and do not underestimate their power.
Medical interference
For implant holders: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Operating temperature
Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).
Mechanical processing
Machining of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
Electronic devices
Do not bring magnets close to a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.
Keep away from electronics
Navigation devices and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.
Allergic reactions
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop handling magnets and use protective gear.
This is not a toy
Neodymium magnets are not intended for children. Accidental ingestion of a few magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.
Material brittleness
Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. Eye protection is mandatory.
Bodily injuries
Large magnets can smash fingers instantly. Never place your hand betwixt two strong magnets.
