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
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Technical details - 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 |
Technical modeling of the product - report
Presented values are the outcome of a physical calculation. Results are based on models for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these calculations as a supplementary guide 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
|
weak grip |
| 1 mm |
2332 Gs
233.2 mT
|
0.57 kg / 1.26 lbs
571.1 g / 5.6 N
|
weak grip |
| 2 mm |
1590 Gs
159.0 mT
|
0.27 kg / 0.59 lbs
265.5 g / 2.6 N
|
weak grip |
| 3 mm |
1044 Gs
104.4 mT
|
0.11 kg / 0.25 lbs
114.6 g / 1.1 N
|
weak grip |
| 5 mm |
466 Gs
46.6 mT
|
0.02 kg / 0.05 lbs
22.8 g / 0.2 N
|
weak grip |
| 10 mm |
100 Gs
10.0 mT
|
0.00 kg / 0.00 lbs
1.1 g / 0.0 N
|
weak grip |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
weak grip |
| 20 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
5 Gs
0.5 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: Slippage capacity (vertical surface)
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 (shearing) - vertical pull
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: Material efficiency (substrate influence) - 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: Working in heat (material behavior) - power drop
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: Two magnets (repulsion) - field range
MW 7x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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) (implants) - 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 |
| 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) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (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: Surface protection spec
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: Hydrostatics and buoyancy
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
*Caution: On a vertical wall, the magnet retains merely ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) severely limits 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) = 0.39
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Pros and cons of Nd2Fe14B magnets.
Advantages
- They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
- Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external field sources,
- By using a reflective layer of silver, the element has an modern look,
- The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
- Thanks to flexibility in shaping and the capacity to adapt to unusual requirements,
- Fundamental importance in electronics industry – they serve a role in data components, electric motors, advanced medical instruments, as well as modern systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems
Cons
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We suggest a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated forms.
- Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these magnets can disrupt the diagnostic process medical when they are in the body.
- Due to neodymium price, their price exceeds standard values,
Holding force characteristics
Detachment force of the magnet in optimal conditions – what affects it?
- using a base made of low-carbon steel, functioning as a magnetic yoke
- whose thickness reaches at least 10 mm
- with a surface perfectly flat
- under conditions of gap-free contact (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- at temperature room level
Lifting capacity in real conditions – factors
- Gap (betwixt the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Heat sensitivity
Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.
Immense force
Be careful. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can move away.
Allergic reactions
Studies show that nickel (the usual finish) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands and select encased magnets.
Pinching danger
Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.
Cards and drives
Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of min. 10 cm.
Shattering risk
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Danger to the youngest
Only for adults. Tiny parts can be swallowed, causing intestinal necrosis. Keep out of reach of kids and pets.
Phone sensors
A powerful magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Maintain magnets near a smartphone to avoid damaging the sensors.
Life threat
Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Machining danger
Machining of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
