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 magnet - data
Presented information are the direct effect of a mathematical calculation. Results rely on models for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static pull force (force 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 LBS
1940.0 g / 19.0 N
|
low risk |
| 1 mm |
2774 Gs
277.4 mT
|
1.27 kg / 2.79 LBS
1266.5 g / 12.4 N
|
low risk |
| 2 mm |
2090 Gs
209.0 mT
|
0.72 kg / 1.59 LBS
719.2 g / 7.1 N
|
low risk |
| 3 mm |
1521 Gs
152.1 mT
|
0.38 kg / 0.84 LBS
380.7 g / 3.7 N
|
low risk |
| 5 mm |
795 Gs
79.5 mT
|
0.10 kg / 0.23 LBS
104.1 g / 1.0 N
|
low risk |
| 10 mm |
205 Gs
20.5 mT
|
0.01 kg / 0.02 LBS
6.9 g / 0.1 N
|
low risk |
| 15 mm |
76 Gs
7.6 mT
|
0.00 kg / 0.00 LBS
1.0 g / 0.0 N
|
low risk |
| 20 mm |
36 Gs
3.6 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
low risk |
| 30 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Sliding hold (vertical surface)
MW 9x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.39 kg / 0.86 LBS
388.0 g / 3.8 N
|
| 1 mm | Stal (~0.2) |
0.25 kg / 0.56 LBS
254.0 g / 2.5 N
|
| 2 mm | Stal (~0.2) |
0.14 kg / 0.32 LBS
144.0 g / 1.4 N
|
| 3 mm | Stal (~0.2) |
0.08 kg / 0.17 LBS
76.0 g / 0.7 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
20.0 g / 0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 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 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 LBS
582.0 g / 5.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.39 kg / 0.86 LBS
388.0 g / 3.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.19 kg / 0.43 LBS
194.0 g / 1.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.97 kg / 2.14 LBS
970.0 g / 9.5 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 9x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.19 kg / 0.43 LBS
194.0 g / 1.9 N
|
| 1 mm |
|
0.49 kg / 1.07 LBS
485.0 g / 4.8 N
|
| 2 mm |
|
0.97 kg / 2.14 LBS
970.0 g / 9.5 N
|
| 3 mm |
|
1.46 kg / 3.21 LBS
1455.0 g / 14.3 N
|
| 5 mm |
|
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
|
| 10 mm |
|
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
|
| 11 mm |
|
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
|
| 12 mm |
|
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
|
Table 5: Thermal stability (material behavior) - power drop
MW 9x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
|
OK |
| 40 °C | -2.2% |
1.90 kg / 4.18 LBS
1897.3 g / 18.6 N
|
OK |
| 60 °C | -4.4% |
1.85 kg / 4.09 LBS
1854.6 g / 18.2 N
|
|
| 80 °C | -6.6% |
1.81 kg / 3.99 LBS
1812.0 g / 17.8 N
|
|
| 100 °C | -28.8% |
1.38 kg / 3.05 LBS
1381.3 g / 13.6 N
|
Table 6: Two magnets (repulsion) - 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 LBS
4 949 Gs
|
0.69 kg / 1.53 LBS
693 g / 6.8 N
|
N/A |
| 1 mm |
3.82 kg / 8.43 LBS
6 244 Gs
|
0.57 kg / 1.26 LBS
573 g / 5.6 N
|
3.44 kg / 7.58 LBS
~0 Gs
|
| 2 mm |
3.02 kg / 6.65 LBS
5 548 Gs
|
0.45 kg / 1.00 LBS
453 g / 4.4 N
|
2.72 kg / 5.99 LBS
~0 Gs
|
| 3 mm |
2.30 kg / 5.08 LBS
4 847 Gs
|
0.35 kg / 0.76 LBS
346 g / 3.4 N
|
2.07 kg / 4.57 LBS
~0 Gs
|
| 5 mm |
1.25 kg / 2.76 LBS
3 575 Gs
|
0.19 kg / 0.41 LBS
188 g / 1.8 N
|
1.13 kg / 2.49 LBS
~0 Gs
|
| 10 mm |
0.25 kg / 0.55 LBS
1 591 Gs
|
0.04 kg / 0.08 LBS
37 g / 0.4 N
|
0.22 kg / 0.49 LBS
~0 Gs
|
| 20 mm |
0.02 kg / 0.04 LBS
410 Gs
|
0.00 kg / 0.01 LBS
2 g / 0.0 N
|
0.01 kg / 0.03 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
39 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
23 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
15 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
10 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
7 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
5 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 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 |
| Mechanical watch | 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 (cracking risk) - collision effects
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: Surface protection spec
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: Underwater work (magnet fishing)
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. Sliding resistance
*Note: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) significantly reduces 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) = 0.44
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros and cons of neodymium magnets.
Strengths
- They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (in testing),
- Magnets very well protect themselves against loss of magnetization caused by ambient magnetic noise,
- By using a shiny coating of gold, the element presents an proper look,
- Magnets are characterized by very high magnetic induction on the working surface,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of individual creating and adapting to complex needs,
- Fundamental importance in advanced technology sectors – they serve a role in hard drives, electric drive systems, diagnostic systems, and technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Cons
- To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can lose their strength 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 rust. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
- We suggest cover - magnetic mount, due to difficulties in creating threads inside the magnet and complicated forms.
- Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small elements of these products can complicate diagnosis medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what affects it?
- with the application of a sheet made of special test steel, guaranteeing maximum field concentration
- whose transverse dimension reaches at least 10 mm
- with an ideally smooth contact surface
- without the slightest insulating layer between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- at standard ambient temperature
Practical aspects of lifting capacity – factors
- Distance (betwixt the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to varnish, rust or dirt).
- Load vector – highest force is reached only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
- Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
H&S for magnets
Keep away from electronics
Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a safe distance from your phone, device, and GPS.
Cards and drives
Do not bring magnets close to a wallet, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.
Allergy Warning
Studies show that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands and opt for encased magnets.
Fire warning
Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.
Respect the power
Use magnets with awareness. Their powerful strength can surprise even professionals. Stay alert and respect their force.
This is not a toy
These products are not toys. Eating multiple magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates urgent medical intervention.
Operating temperature
Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Magnet fragility
Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.
Crushing force
Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Warning for heart patients
Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
