MW 29.9x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010052
GTIN/EAN: 5906301810513
Diameter Ø
29.9 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
52.66 g
Magnetization Direction
→ diametrical
Load capacity
21.50 kg / 210.90 N
Magnetic Induction
344.60 mT / 3446 Gs
Coating
[NiCuNi] Nickel
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Physical properties - MW 29.9x10 / N38 - cylindrical magnet
Specification / characteristics - MW 29.9x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010052 |
| GTIN/EAN | 5906301810513 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 29.9 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 52.66 g |
| Magnetization Direction | → diametrical |
| Load capacity ~ ? | 21.50 kg / 210.90 N |
| Magnetic Induction ~ ? | 344.60 mT / 3446 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 |
Physical analysis of the magnet - data
Presented values represent the result of a physical simulation. Values are based on models for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs gap) - interaction chart
MW 29.9x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3445 Gs
344.5 mT
|
21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
|
critical level |
| 1 mm |
3261 Gs
326.1 mT
|
19.26 kg / 42.45 pounds
19256.6 g / 188.9 N
|
critical level |
| 2 mm |
3059 Gs
305.9 mT
|
16.95 kg / 37.36 pounds
16947.4 g / 166.3 N
|
critical level |
| 3 mm |
2848 Gs
284.8 mT
|
14.70 kg / 32.40 pounds
14696.2 g / 144.2 N
|
critical level |
| 5 mm |
2425 Gs
242.5 mT
|
10.65 kg / 23.48 pounds
10650.1 g / 104.5 N
|
critical level |
| 10 mm |
1519 Gs
151.9 mT
|
4.18 kg / 9.21 pounds
4178.4 g / 41.0 N
|
warning |
| 15 mm |
930 Gs
93.0 mT
|
1.57 kg / 3.45 pounds
1565.8 g / 15.4 N
|
low risk |
| 20 mm |
583 Gs
58.3 mT
|
0.62 kg / 1.36 pounds
616.0 g / 6.0 N
|
low risk |
| 30 mm |
258 Gs
25.8 mT
|
0.12 kg / 0.27 pounds
121.0 g / 1.2 N
|
low risk |
| 50 mm |
76 Gs
7.6 mT
|
0.01 kg / 0.02 pounds
10.4 g / 0.1 N
|
low risk |
Table 2: Shear load (vertical surface)
MW 29.9x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.30 kg / 9.48 pounds
4300.0 g / 42.2 N
|
| 1 mm | Stal (~0.2) |
3.85 kg / 8.49 pounds
3852.0 g / 37.8 N
|
| 2 mm | Stal (~0.2) |
3.39 kg / 7.47 pounds
3390.0 g / 33.3 N
|
| 3 mm | Stal (~0.2) |
2.94 kg / 6.48 pounds
2940.0 g / 28.8 N
|
| 5 mm | Stal (~0.2) |
2.13 kg / 4.70 pounds
2130.0 g / 20.9 N
|
| 10 mm | Stal (~0.2) |
0.84 kg / 1.84 pounds
836.0 g / 8.2 N
|
| 15 mm | Stal (~0.2) |
0.31 kg / 0.69 pounds
314.0 g / 3.1 N
|
| 20 mm | Stal (~0.2) |
0.12 kg / 0.27 pounds
124.0 g / 1.2 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
24.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 29.9x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
6.45 kg / 14.22 pounds
6450.0 g / 63.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.30 kg / 9.48 pounds
4300.0 g / 42.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.15 kg / 4.74 pounds
2150.0 g / 21.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.75 kg / 23.70 pounds
10750.0 g / 105.5 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 29.9x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.08 kg / 2.37 pounds
1075.0 g / 10.5 N
|
| 1 mm |
|
2.69 kg / 5.92 pounds
2687.5 g / 26.4 N
|
| 2 mm |
|
5.38 kg / 11.85 pounds
5375.0 g / 52.7 N
|
| 3 mm |
|
8.06 kg / 17.77 pounds
8062.5 g / 79.1 N
|
| 5 mm |
|
13.44 kg / 29.62 pounds
13437.5 g / 131.8 N
|
| 10 mm |
|
21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
|
| 11 mm |
|
21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
|
| 12 mm |
|
21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MW 29.9x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
|
OK |
| 40 °C | -2.2% |
21.03 kg / 46.36 pounds
21027.0 g / 206.3 N
|
OK |
| 60 °C | -4.4% |
20.55 kg / 45.31 pounds
20554.0 g / 201.6 N
|
|
| 80 °C | -6.6% |
20.08 kg / 44.27 pounds
20081.0 g / 197.0 N
|
|
| 100 °C | -28.8% |
15.31 kg / 33.75 pounds
15308.0 g / 150.2 N
|
Table 6: Two magnets (attraction) - forces in the system
MW 29.9x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
51.38 kg / 113.28 pounds
4 963 Gs
|
7.71 kg / 16.99 pounds
7708 g / 75.6 N
|
N/A |
| 1 mm |
48.76 kg / 107.50 pounds
6 712 Gs
|
7.31 kg / 16.12 pounds
7314 g / 71.7 N
|
43.88 kg / 96.75 pounds
~0 Gs
|
| 2 mm |
46.02 kg / 101.46 pounds
6 521 Gs
|
6.90 kg / 15.22 pounds
6903 g / 67.7 N
|
41.42 kg / 91.32 pounds
~0 Gs
|
| 3 mm |
43.26 kg / 95.37 pounds
6 322 Gs
|
6.49 kg / 14.31 pounds
6489 g / 63.7 N
|
38.93 kg / 85.83 pounds
~0 Gs
|
| 5 mm |
37.78 kg / 83.30 pounds
5 909 Gs
|
5.67 kg / 12.49 pounds
5667 g / 55.6 N
|
34.00 kg / 74.97 pounds
~0 Gs
|
| 10 mm |
25.45 kg / 56.11 pounds
4 850 Gs
|
3.82 kg / 8.42 pounds
3818 g / 37.5 N
|
22.91 kg / 50.50 pounds
~0 Gs
|
| 20 mm |
9.99 kg / 22.02 pounds
3 038 Gs
|
1.50 kg / 3.30 pounds
1498 g / 14.7 N
|
8.99 kg / 19.81 pounds
~0 Gs
|
| 50 mm |
0.63 kg / 1.38 pounds
761 Gs
|
0.09 kg / 0.21 pounds
94 g / 0.9 N
|
0.56 kg / 1.24 pounds
~0 Gs
|
| 60 mm |
0.29 kg / 0.64 pounds
517 Gs
|
0.04 kg / 0.10 pounds
43 g / 0.4 N
|
0.26 kg / 0.57 pounds
~0 Gs
|
| 70 mm |
0.14 kg / 0.32 pounds
364 Gs
|
0.02 kg / 0.05 pounds
22 g / 0.2 N
|
0.13 kg / 0.28 pounds
~0 Gs
|
| 80 mm |
0.08 kg / 0.17 pounds
265 Gs
|
0.01 kg / 0.03 pounds
11 g / 0.1 N
|
0.07 kg / 0.15 pounds
~0 Gs
|
| 90 mm |
0.04 kg / 0.09 pounds
198 Gs
|
0.01 kg / 0.01 pounds
6 g / 0.1 N
|
0.04 kg / 0.08 pounds
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 pounds
152 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MW 29.9x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 11.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Impact energy (kinetic energy) - warning
MW 29.9x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.72 km/h
(6.31 m/s)
|
1.05 J | |
| 30 mm |
35.42 km/h
(9.84 m/s)
|
2.55 J | |
| 50 mm |
45.58 km/h
(12.66 m/s)
|
4.22 J | |
| 100 mm |
64.44 km/h
(17.90 m/s)
|
8.44 J |
Table 9: Surface protection spec
MW 29.9x10 / 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: Electrical data (Flux)
MW 29.9x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 25 588 Mx | 255.9 µWb |
| Pc Coefficient | 0.44 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 29.9x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 21.50 kg | Standard |
| Water (riverbed) |
24.62 kg
(+3.12 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet retains only approx. 20-30% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Thermal stability
*For N38 grade, 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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Pros and cons of neodymium magnets.
Strengths
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
- They possess excellent resistance to magnetism drop as a result of opposing magnetic fields,
- A magnet with a smooth gold surface has an effective appearance,
- Neodymium magnets create maximum magnetic induction on a their surface, which increases force concentration,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Due to the ability of precise forming and adaptation to individualized requirements, NdFeB magnets can be modeled in a wide range of shapes and sizes, which amplifies use scope,
- Universal use in high-tech industry – they are commonly used in magnetic memories, drive modules, precision medical tools, also modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
- Neodymium magnets decrease their strength 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
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- We suggest casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
- Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products are able to be problematic in diagnostics medical when they are in the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what it depends on?
- with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
- with a cross-section no less than 10 mm
- characterized by lack of roughness
- with total lack of distance (no paint)
- for force acting at a right angle (pull-off, not shear)
- at standard ambient temperature
Key elements affecting lifting force
- Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
- Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.
Safe handling of neodymium magnets
Combustion hazard
Powder produced during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Safe distance
Do not bring magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.
Caution required
Handle magnets with awareness. Their huge power can surprise even professionals. Stay alert and respect their power.
Allergy Warning
Certain individuals suffer from a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Prolonged contact may cause dermatitis. We strongly advise wear protective gloves.
Medical interference
Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Choking Hazard
Absolutely store magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are tragic.
Permanent damage
Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. Damage is permanent.
Fragile material
Protect your eyes. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.
Impact on smartphones
GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.
Pinching danger
Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.
