MW 3x2 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010064
GTIN/EAN: 5906301810636
Diameter Ø
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.11 g
Magnetization Direction
↑ axial
Load capacity
0.30 kg / 2.99 N
Magnetic Induction
493.99 mT / 4940 Gs
Coating
[NiCuNi] Nickel
0.1476 ZŁ with VAT / pcs + price for transport
0.1200 ZŁ net + 23% VAT / pcs
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Product card - MW 3x2 / N38 - cylindrical magnet
Specification / characteristics - MW 3x2 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010064 |
| GTIN/EAN | 5906301810636 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 3 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 0.11 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.30 kg / 2.99 N |
| Magnetic Induction ~ ? | 493.99 mT / 4940 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 analysis of the assembly - report
Presented values constitute the direct effect of a mathematical calculation. Results are based on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static force (pull vs gap) - power drop
MW 3x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4928 Gs
492.8 mT
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
low risk |
| 1 mm |
2106 Gs
210.6 mT
|
0.05 kg / 0.12 LBS
54.8 g / 0.5 N
|
low risk |
| 2 mm |
845 Gs
84.5 mT
|
0.01 kg / 0.02 LBS
8.8 g / 0.1 N
|
low risk |
| 3 mm |
393 Gs
39.3 mT
|
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
|
low risk |
| 5 mm |
124 Gs
12.4 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
low risk |
| 10 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 15 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 20 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Shear capacity (vertical surface)
MW 3x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.06 kg / 0.13 LBS
60.0 g / 0.6 N
|
| 1 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
10.0 g / 0.1 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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: Wall mounting (shearing) - behavior on slippery surfaces
MW 3x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.06 kg / 0.13 LBS
60.0 g / 0.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 3x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
|
| 1 mm |
|
0.08 kg / 0.17 LBS
75.0 g / 0.7 N
|
| 2 mm |
|
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
|
| 3 mm |
|
0.22 kg / 0.50 LBS
225.0 g / 2.2 N
|
| 5 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
| 10 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
| 11 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
| 12 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
Table 5: Thermal stability (stability) - resistance threshold
MW 3x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
OK |
| 40 °C | -2.2% |
0.29 kg / 0.65 LBS
293.4 g / 2.9 N
|
OK |
| 60 °C | -4.4% |
0.29 kg / 0.63 LBS
286.8 g / 2.8 N
|
OK |
| 80 °C | -6.6% |
0.28 kg / 0.62 LBS
280.2 g / 2.7 N
|
|
| 100 °C | -28.8% |
0.21 kg / 0.47 LBS
213.6 g / 2.1 N
|
Table 6: Two magnets (repulsion) - field range
MW 3x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.06 kg / 2.33 LBS
5 766 Gs
|
0.16 kg / 0.35 LBS
159 g / 1.6 N
|
N/A |
| 1 mm |
0.49 kg / 1.08 LBS
6 712 Gs
|
0.07 kg / 0.16 LBS
74 g / 0.7 N
|
0.44 kg / 0.97 LBS
~0 Gs
|
| 2 mm |
0.19 kg / 0.43 LBS
4 213 Gs
|
0.03 kg / 0.06 LBS
29 g / 0.3 N
|
0.17 kg / 0.38 LBS
~0 Gs
|
| 3 mm |
0.08 kg / 0.17 LBS
2 629 Gs
|
0.01 kg / 0.02 LBS
11 g / 0.1 N
|
0.07 kg / 0.15 LBS
~0 Gs
|
| 5 mm |
0.01 kg / 0.03 LBS
1 131 Gs
|
0.00 kg / 0.00 LBS
2 g / 0.0 N
|
0.01 kg / 0.03 LBS
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 LBS
248 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
41 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
3 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
2 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
1 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
1 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
1 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
0 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MW 3x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 2.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 1.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 1.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.0 cm |
| Remote | 50 Gs (5.0 mT) | 1.0 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Collisions (kinetic energy) - warning
MW 3x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
52.67 km/h
(14.63 m/s)
|
0.01 J | |
| 30 mm |
91.22 km/h
(25.34 m/s)
|
0.04 J | |
| 50 mm |
117.77 km/h
(32.71 m/s)
|
0.06 J | |
| 100 mm |
166.55 km/h
(46.26 m/s)
|
0.12 J |
Table 9: Corrosion resistance
MW 3x2 / 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 3x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 353 Mx | 3.5 µWb |
| Pc Coefficient | 0.71 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 3x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.30 kg | Standard |
| Water (riverbed) |
0.34 kg
(+0.04 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet retains just a fraction of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Heat tolerance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages and disadvantages of neodymium magnets.
Benefits
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
- They retain their magnetic properties even under external field action,
- Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an professional appearance,
- Magnetic induction on the surface of the magnet is exceptional,
- 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 precise machining as well as adjusting to concrete requirements,
- Significant place in innovative solutions – they are used in magnetic memories, drive modules, advanced medical instruments, as well as modern systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease 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 durability even at temperatures up to 230°C
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Maximum lifting capacity of the magnet – what contributes to it?
- with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of min. 10 mm to ensure full flux closure
- characterized by even structure
- without the slightest clearance between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- in stable room temperature
Lifting capacity in real conditions – factors
- Distance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
- Pull-off angle – note 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 – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Plate material – low-carbon steel gives the best results. Alloy steels reduce magnetic properties and lifting capacity.
- Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
- Thermal environment – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the load capacity.
H&S for magnets
GPS Danger
Navigation devices and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.
Metal Allergy
Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, cease handling magnets and wear gloves.
Pacemakers
Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.
Operating temperature
Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.
Dust explosion hazard
Mechanical processing of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Handling guide
Be careful. Neodymium magnets act from a distance and snap with huge force, often quicker than you can move away.
Cards and drives
Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.
Choking Hazard
Adult use only. Small elements pose a choking risk, causing serious injuries. Store out of reach of children and animals.
Crushing risk
Protect your hands. Two large magnets will snap together immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!
Magnets are brittle
NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets leads to them breaking into shards.
