MW 7x2 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010099
GTIN/EAN: 5906301810988
Diameter Ø
7 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.58 g
Magnetization Direction
↑ axial
Load capacity
0.99 kg / 9.76 N
Magnetic Induction
307.23 mT / 3072 Gs
Coating
[NiCuNi] Nickel
0.381 ZŁ with VAT / pcs + price for transport
0.310 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical of the product - MW 7x2 / N38 - cylindrical magnet
Specification / characteristics - MW 7x2 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010099 |
| GTIN/EAN | 5906301810988 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 7 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 0.58 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.99 kg / 9.76 N |
| Magnetic Induction ~ ? | 307.23 mT / 3072 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 modeling of the product - report
Presented data are the direct effect of a physical simulation. Results rely on models for the class Nd2Fe14B. Actual performance might slightly differ. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static pull force (force vs gap) - interaction chart
MW 7x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3070 Gs
307.0 mT
|
0.99 kg / 2.18 LBS
990.0 g / 9.7 N
|
safe |
| 1 mm |
2332 Gs
233.2 mT
|
0.57 kg / 1.26 LBS
571.1 g / 5.6 N
|
safe |
| 2 mm |
1590 Gs
159.0 mT
|
0.27 kg / 0.59 LBS
265.5 g / 2.6 N
|
safe |
| 3 mm |
1044 Gs
104.4 mT
|
0.11 kg / 0.25 LBS
114.6 g / 1.1 N
|
safe |
| 5 mm |
466 Gs
46.6 mT
|
0.02 kg / 0.05 LBS
22.8 g / 0.2 N
|
safe |
| 10 mm |
100 Gs
10.0 mT
|
0.00 kg / 0.00 LBS
1.1 g / 0.0 N
|
safe |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
safe |
| 20 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Vertical load (wall)
MW 7x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.20 kg / 0.44 LBS
198.0 g / 1.9 N
|
| 1 mm | Stal (~0.2) |
0.11 kg / 0.25 LBS
114.0 g / 1.1 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.12 LBS
54.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.02 kg / 0.05 LBS
22.0 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 7x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.30 kg / 0.65 LBS
297.0 g / 2.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.20 kg / 0.44 LBS
198.0 g / 1.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.10 kg / 0.22 LBS
99.0 g / 1.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.50 kg / 1.09 LBS
495.0 g / 4.9 N
|
Table 4: Steel thickness (saturation) - power losses
MW 7x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.10 kg / 0.22 LBS
99.0 g / 1.0 N
|
| 1 mm |
|
0.25 kg / 0.55 LBS
247.5 g / 2.4 N
|
| 2 mm |
|
0.50 kg / 1.09 LBS
495.0 g / 4.9 N
|
| 3 mm |
|
0.74 kg / 1.64 LBS
742.5 g / 7.3 N
|
| 5 mm |
|
0.99 kg / 2.18 LBS
990.0 g / 9.7 N
|
| 10 mm |
|
0.99 kg / 2.18 LBS
990.0 g / 9.7 N
|
| 11 mm |
|
0.99 kg / 2.18 LBS
990.0 g / 9.7 N
|
| 12 mm |
|
0.99 kg / 2.18 LBS
990.0 g / 9.7 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MW 7x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.99 kg / 2.18 LBS
990.0 g / 9.7 N
|
OK |
| 40 °C | -2.2% |
0.97 kg / 2.13 LBS
968.2 g / 9.5 N
|
OK |
| 60 °C | -4.4% |
0.95 kg / 2.09 LBS
946.4 g / 9.3 N
|
|
| 80 °C | -6.6% |
0.92 kg / 2.04 LBS
924.7 g / 9.1 N
|
|
| 100 °C | -28.8% |
0.70 kg / 1.55 LBS
704.9 g / 6.9 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 7x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.24 kg / 4.93 LBS
4 653 Gs
|
0.34 kg / 0.74 LBS
335 g / 3.3 N
|
N/A |
| 1 mm |
1.76 kg / 3.89 LBS
5 454 Gs
|
0.26 kg / 0.58 LBS
265 g / 2.6 N
|
1.59 kg / 3.50 LBS
~0 Gs
|
| 2 mm |
1.29 kg / 2.84 LBS
4 663 Gs
|
0.19 kg / 0.43 LBS
193 g / 1.9 N
|
1.16 kg / 2.56 LBS
~0 Gs
|
| 3 mm |
0.89 kg / 1.97 LBS
3 884 Gs
|
0.13 kg / 0.30 LBS
134 g / 1.3 N
|
0.81 kg / 1.77 LBS
~0 Gs
|
| 5 mm |
0.40 kg / 0.87 LBS
2 581 Gs
|
0.06 kg / 0.13 LBS
59 g / 0.6 N
|
0.36 kg / 0.78 LBS
~0 Gs
|
| 10 mm |
0.05 kg / 0.11 LBS
932 Gs
|
0.01 kg / 0.02 LBS
8 g / 0.1 N
|
0.05 kg / 0.10 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 LBS
200 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
17 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
10 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
6 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
4 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
3 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 7x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Mobile device | 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) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Dynamics (cracking risk) - warning
MW 7x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
41.69 km/h
(11.58 m/s)
|
0.04 J | |
| 30 mm |
72.17 km/h
(20.05 m/s)
|
0.12 J | |
| 50 mm |
93.17 km/h
(25.88 m/s)
|
0.19 J | |
| 100 mm |
131.76 km/h
(36.60 m/s)
|
0.39 J |
Table 9: Coating parameters (durability)
MW 7x2 / 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 7x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 284 Mx | 12.8 µWb |
| Pc Coefficient | 0.39 | Low (Flat) |
Table 11: Submerged application
MW 7x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.99 kg | Standard |
| Water (riverbed) |
1.13 kg
(+0.14 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet retains only ~20% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Heat tolerance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.39
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% |
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 and disadvantages of neodymium magnets.
Benefits
- Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (according to research),
- Neodymium magnets are characterized by exceptionally resistant to loss of magnetic properties caused by external interference,
- Thanks to the reflective finish, the coating of nickel, gold, or silver gives an professional appearance,
- They show high magnetic induction at the operating surface, which improves attraction properties,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Due to the possibility of precise forming and adaptation to unique needs, magnetic components can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
- Key role in future technologies – they are used in mass storage devices, motor assemblies, medical devices, also industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in small systems
Weaknesses
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets suffer 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 usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- Due to limitations in producing threads and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
- Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
- Due to expensive raw materials, their price exceeds standard values,
Lifting parameters
Maximum lifting capacity of the magnet – what affects it?
- using a plate made of high-permeability steel, serving as a circuit closing element
- whose transverse dimension reaches at least 10 mm
- with an ground contact surface
- without any air gap between the magnet and steel
- under vertical force direction (90-degree angle)
- in stable room temperature
Practical aspects of lifting capacity – factors
- Gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
- Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the holding force.
Safe handling of neodymium magnets
Crushing risk
Risk of injury: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Heat warning
Keep cool. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).
Impact on smartphones
An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets close to a smartphone to prevent breaking the sensors.
Combustion hazard
Machining of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Eye protection
Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.
Implant safety
Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Keep away from children
Only for adults. Small elements can be swallowed, leading to serious injuries. Keep away from children and animals.
Do not underestimate power
Use magnets consciously. Their huge power can surprise even professionals. Plan your moves and respect their force.
Keep away from computers
Equipment safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).
Allergy Warning
Some people suffer from a contact allergy to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to a rash. We suggest use safety gloves.
