MW 9x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010108
GTIN/EAN: 5906301811077
Diameter Ø
9 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.43 g
Magnetization Direction
↑ axial
Load capacity
1.94 kg / 18.99 N
Magnetic Induction
343.55 mT / 3436 Gs
Coating
[NiCuNi] Nickel
1.132 ZŁ with VAT / pcs + price for transport
0.920 ZŁ net + 23% VAT / pcs
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Physical properties - MW 9x3 / N38 - cylindrical magnet
Specification / characteristics - MW 9x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010108 |
| GTIN/EAN | 5906301811077 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 9 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 1.43 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.94 kg / 18.99 N |
| Magnetic Induction ~ ? | 343.55 mT / 3436 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 - technical parameters
Presented values represent the direct effect of a engineering analysis. Values rely on algorithms for the material Nd2Fe14B. Actual conditions may differ. Please consider these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (pull vs gap) - interaction chart
MW 9x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3433 Gs
343.3 mT
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
low risk |
| 1 mm |
2774 Gs
277.4 mT
|
1.27 kg / 2.79 pounds
1266.5 g / 12.4 N
|
low risk |
| 2 mm |
2090 Gs
209.0 mT
|
0.72 kg / 1.59 pounds
719.2 g / 7.1 N
|
low risk |
| 3 mm |
1521 Gs
152.1 mT
|
0.38 kg / 0.84 pounds
380.7 g / 3.7 N
|
low risk |
| 5 mm |
795 Gs
79.5 mT
|
0.10 kg / 0.23 pounds
104.1 g / 1.0 N
|
low risk |
| 10 mm |
205 Gs
20.5 mT
|
0.01 kg / 0.02 pounds
6.9 g / 0.1 N
|
low risk |
| 15 mm |
76 Gs
7.6 mT
|
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
|
low risk |
| 20 mm |
36 Gs
3.6 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
low risk |
| 30 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Shear hold (wall)
MW 9x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.39 kg / 0.86 pounds
388.0 g / 3.8 N
|
| 1 mm | Stal (~0.2) |
0.25 kg / 0.56 pounds
254.0 g / 2.5 N
|
| 2 mm | Stal (~0.2) |
0.14 kg / 0.32 pounds
144.0 g / 1.4 N
|
| 3 mm | Stal (~0.2) |
0.08 kg / 0.17 pounds
76.0 g / 0.7 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 g / 0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 9x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.58 kg / 1.28 pounds
582.0 g / 5.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.39 kg / 0.86 pounds
388.0 g / 3.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.19 kg / 0.43 pounds
194.0 g / 1.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.97 kg / 2.14 pounds
970.0 g / 9.5 N
|
Table 4: Steel thickness (saturation) - power losses
MW 9x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.19 kg / 0.43 pounds
194.0 g / 1.9 N
|
| 1 mm |
|
0.49 kg / 1.07 pounds
485.0 g / 4.8 N
|
| 2 mm |
|
0.97 kg / 2.14 pounds
970.0 g / 9.5 N
|
| 3 mm |
|
1.46 kg / 3.21 pounds
1455.0 g / 14.3 N
|
| 5 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
| 10 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
| 11 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
| 12 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
Table 5: Working in heat (stability) - resistance threshold
MW 9x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
OK |
| 40 °C | -2.2% |
1.90 kg / 4.18 pounds
1897.3 g / 18.6 N
|
OK |
| 60 °C | -4.4% |
1.85 kg / 4.09 pounds
1854.6 g / 18.2 N
|
|
| 80 °C | -6.6% |
1.81 kg / 3.99 pounds
1812.0 g / 17.8 N
|
|
| 100 °C | -28.8% |
1.38 kg / 3.05 pounds
1381.3 g / 13.6 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 9x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.62 kg / 10.19 pounds
4 949 Gs
|
0.69 kg / 1.53 pounds
693 g / 6.8 N
|
N/A |
| 1 mm |
3.82 kg / 8.43 pounds
6 244 Gs
|
0.57 kg / 1.26 pounds
573 g / 5.6 N
|
3.44 kg / 7.58 pounds
~0 Gs
|
| 2 mm |
3.02 kg / 6.65 pounds
5 548 Gs
|
0.45 kg / 1.00 pounds
453 g / 4.4 N
|
2.72 kg / 5.99 pounds
~0 Gs
|
| 3 mm |
2.30 kg / 5.08 pounds
4 847 Gs
|
0.35 kg / 0.76 pounds
346 g / 3.4 N
|
2.07 kg / 4.57 pounds
~0 Gs
|
| 5 mm |
1.25 kg / 2.76 pounds
3 575 Gs
|
0.19 kg / 0.41 pounds
188 g / 1.8 N
|
1.13 kg / 2.49 pounds
~0 Gs
|
| 10 mm |
0.25 kg / 0.55 pounds
1 591 Gs
|
0.04 kg / 0.08 pounds
37 g / 0.4 N
|
0.22 kg / 0.49 pounds
~0 Gs
|
| 20 mm |
0.02 kg / 0.04 pounds
410 Gs
|
0.00 kg / 0.01 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
39 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
23 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
15 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
7 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
5 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MW 9x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Remote | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (kinetic energy) - warning
MW 9x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
37.23 km/h
(10.34 m/s)
|
0.08 J | |
| 30 mm |
64.34 km/h
(17.87 m/s)
|
0.23 J | |
| 50 mm |
83.06 km/h
(23.07 m/s)
|
0.38 J | |
| 100 mm |
117.47 km/h
(32.63 m/s)
|
0.76 J |
Table 9: Anti-corrosion coating durability
MW 9x3 / 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 9x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 314 Mx | 23.1 µWb |
| Pc Coefficient | 0.44 | Low (Flat) |
Table 11: Submerged application
MW 9x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.94 kg | Standard |
| Water (riverbed) |
2.22 kg
(+0.28 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.
3. Temperature resistance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.44
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 |
View also proposals
Strengths and weaknesses of neodymium magnets.
Advantages
- They retain full power for nearly ten years – the drop is just ~1% (based on simulations),
- They are resistant to demagnetization induced by external disturbances,
- A magnet with a shiny gold surface has better aesthetics,
- Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of custom forming and optimizing to individual conditions,
- Significant place in electronics industry – they serve a role in data components, electric motors, medical equipment, as well as modern systems.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Cons
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mount.
- Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Highest magnetic holding force – what affects it?
- on a base made of structural steel, effectively closing the magnetic field
- whose transverse dimension reaches at least 10 mm
- with an polished touching surface
- under conditions of ideal adhesion (surface-to-surface)
- during detachment in a direction perpendicular to the plane
- at temperature approx. 20 degrees Celsius
Lifting capacity in practice – influencing factors
- Distance (between the magnet and the metal), since even a very small distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
- Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
- Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
- Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.
Warnings
Health Danger
Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.
Combustion hazard
Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Demagnetization risk
Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Phone sensors
A powerful magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a device to prevent breaking the sensors.
Electronic hazard
Do not bring magnets near a wallet, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Skin irritation risks
Certain individuals suffer from a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in dermatitis. We strongly advise use safety gloves.
Adults only
Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.
Fragile material
Neodymium magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them breaking into small pieces.
Crushing risk
Pinching hazard: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Safe operation
Use magnets consciously. Their huge power can shock even experienced users. Plan your moves and respect their force.
