MW 29x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010053
GTIN/EAN: 5906301810520
Diameter Ø
29 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
49.54 g
Magnetization Direction
↑ axial
Load capacity
20.82 kg / 204.22 N
Magnetic Induction
351.88 mT / 3519 Gs
Coating
[NiCuNi] Nickel
17.34 ZŁ with VAT / pcs + price for transport
14.10 ZŁ net + 23% VAT / pcs
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Technical parameters - MW 29x10 / N38 - cylindrical magnet
Specification / characteristics - MW 29x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010053 |
| GTIN/EAN | 5906301810520 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 29 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 49.54 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 20.82 kg / 204.22 N |
| Magnetic Induction ~ ? | 351.88 mT / 3519 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 analysis of the magnet - technical parameters
Presented data are the outcome of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Actual parameters might slightly differ. Use these data as a supplementary guide for designers.
Table 1: Static force (force vs gap) - power drop
MW 29x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3518 Gs
351.8 mT
|
20.82 kg / 45.90 pounds
20820.0 g / 204.2 N
|
critical level |
| 1 mm |
3321 Gs
332.1 mT
|
18.55 kg / 40.89 pounds
18548.8 g / 182.0 N
|
critical level |
| 2 mm |
3106 Gs
310.6 mT
|
16.23 kg / 35.77 pounds
16226.1 g / 159.2 N
|
critical level |
| 3 mm |
2883 Gs
288.3 mT
|
13.98 kg / 30.82 pounds
13978.2 g / 137.1 N
|
critical level |
| 5 mm |
2437 Gs
243.7 mT
|
9.99 kg / 22.02 pounds
9987.1 g / 98.0 N
|
strong |
| 10 mm |
1500 Gs
150.0 mT
|
3.78 kg / 8.34 pounds
3783.1 g / 37.1 N
|
strong |
| 15 mm |
905 Gs
90.5 mT
|
1.38 kg / 3.04 pounds
1379.2 g / 13.5 N
|
low risk |
| 20 mm |
563 Gs
56.3 mT
|
0.53 kg / 1.17 pounds
532.4 g / 5.2 N
|
low risk |
| 30 mm |
247 Gs
24.7 mT
|
0.10 kg / 0.23 pounds
102.4 g / 1.0 N
|
low risk |
| 50 mm |
72 Gs
7.2 mT
|
0.01 kg / 0.02 pounds
8.7 g / 0.1 N
|
low risk |
Table 2: Sliding force (wall)
MW 29x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.16 kg / 9.18 pounds
4164.0 g / 40.8 N
|
| 1 mm | Stal (~0.2) |
3.71 kg / 8.18 pounds
3710.0 g / 36.4 N
|
| 2 mm | Stal (~0.2) |
3.25 kg / 7.16 pounds
3246.0 g / 31.8 N
|
| 3 mm | Stal (~0.2) |
2.80 kg / 6.16 pounds
2796.0 g / 27.4 N
|
| 5 mm | Stal (~0.2) |
2.00 kg / 4.40 pounds
1998.0 g / 19.6 N
|
| 10 mm | Stal (~0.2) |
0.76 kg / 1.67 pounds
756.0 g / 7.4 N
|
| 15 mm | Stal (~0.2) |
0.28 kg / 0.61 pounds
276.0 g / 2.7 N
|
| 20 mm | Stal (~0.2) |
0.11 kg / 0.23 pounds
106.0 g / 1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 29x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
6.25 kg / 13.77 pounds
6246.0 g / 61.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.16 kg / 9.18 pounds
4164.0 g / 40.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.08 kg / 4.59 pounds
2082.0 g / 20.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.41 kg / 22.95 pounds
10410.0 g / 102.1 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 29x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.04 kg / 2.30 pounds
1041.0 g / 10.2 N
|
| 1 mm |
|
2.60 kg / 5.74 pounds
2602.5 g / 25.5 N
|
| 2 mm |
|
5.21 kg / 11.48 pounds
5205.0 g / 51.1 N
|
| 3 mm |
|
7.81 kg / 17.21 pounds
7807.5 g / 76.6 N
|
| 5 mm |
|
13.01 kg / 28.69 pounds
13012.5 g / 127.7 N
|
| 10 mm |
|
20.82 kg / 45.90 pounds
20820.0 g / 204.2 N
|
| 11 mm |
|
20.82 kg / 45.90 pounds
20820.0 g / 204.2 N
|
| 12 mm |
|
20.82 kg / 45.90 pounds
20820.0 g / 204.2 N
|
Table 5: Thermal resistance (stability) - power drop
MW 29x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
20.82 kg / 45.90 pounds
20820.0 g / 204.2 N
|
OK |
| 40 °C | -2.2% |
20.36 kg / 44.89 pounds
20362.0 g / 199.8 N
|
OK |
| 60 °C | -4.4% |
19.90 kg / 43.88 pounds
19903.9 g / 195.3 N
|
|
| 80 °C | -6.6% |
19.45 kg / 42.87 pounds
19445.9 g / 190.8 N
|
|
| 100 °C | -28.8% |
14.82 kg / 32.68 pounds
14823.8 g / 145.4 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 29x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
50.40 kg / 111.11 pounds
5 016 Gs
|
7.56 kg / 16.67 pounds
7560 g / 74.2 N
|
N/A |
| 1 mm |
47.70 kg / 105.17 pounds
6 845 Gs
|
7.16 kg / 15.78 pounds
7156 g / 70.2 N
|
42.93 kg / 94.65 pounds
~0 Gs
|
| 2 mm |
44.90 kg / 98.99 pounds
6 641 Gs
|
6.74 kg / 14.85 pounds
6735 g / 66.1 N
|
40.41 kg / 89.09 pounds
~0 Gs
|
| 3 mm |
42.08 kg / 92.77 pounds
6 429 Gs
|
6.31 kg / 13.92 pounds
6312 g / 61.9 N
|
37.87 kg / 83.50 pounds
~0 Gs
|
| 5 mm |
36.52 kg / 80.52 pounds
5 990 Gs
|
5.48 kg / 12.08 pounds
5478 g / 53.7 N
|
32.87 kg / 72.47 pounds
~0 Gs
|
| 10 mm |
24.18 kg / 53.30 pounds
4 873 Gs
|
3.63 kg / 7.99 pounds
3626 g / 35.6 N
|
21.76 kg / 47.97 pounds
~0 Gs
|
| 20 mm |
9.16 kg / 20.19 pounds
2 999 Gs
|
1.37 kg / 3.03 pounds
1374 g / 13.5 N
|
8.24 kg / 18.17 pounds
~0 Gs
|
| 50 mm |
0.54 kg / 1.19 pounds
729 Gs
|
0.08 kg / 0.18 pounds
81 g / 0.8 N
|
0.49 kg / 1.07 pounds
~0 Gs
|
| 60 mm |
0.25 kg / 0.55 pounds
493 Gs
|
0.04 kg / 0.08 pounds
37 g / 0.4 N
|
0.22 kg / 0.49 pounds
~0 Gs
|
| 70 mm |
0.12 kg / 0.27 pounds
347 Gs
|
0.02 kg / 0.04 pounds
18 g / 0.2 N
|
0.11 kg / 0.24 pounds
~0 Gs
|
| 80 mm |
0.06 kg / 0.14 pounds
252 Gs
|
0.01 kg / 0.02 pounds
10 g / 0.1 N
|
0.06 kg / 0.13 pounds
~0 Gs
|
| 90 mm |
0.04 kg / 0.08 pounds
188 Gs
|
0.01 kg / 0.01 pounds
5 g / 0.1 N
|
0.03 kg / 0.07 pounds
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 pounds
144 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.04 pounds
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MW 29x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Phone / Smartphone | 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: Collisions (kinetic energy) - warning
MW 29x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.90 km/h
(6.36 m/s)
|
1.00 J | |
| 30 mm |
35.92 km/h
(9.98 m/s)
|
2.47 J | |
| 50 mm |
46.24 km/h
(12.85 m/s)
|
4.09 J | |
| 100 mm |
65.38 km/h
(18.16 m/s)
|
8.17 J |
Table 9: Coating parameters (durability)
MW 29x10 / 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 (Pc)
MW 29x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 24 471 Mx | 244.7 µWb |
| Pc Coefficient | 0.45 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 29x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 20.82 kg | Standard |
| Water (riverbed) |
23.84 kg
(+3.02 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical surface, the magnet retains only a fraction of its nominal pull.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Heat tolerance
*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) = 0.45
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 |
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Pros and cons of Nd2Fe14B magnets.
Benefits
- They retain magnetic properties for nearly 10 years – the drop is just ~1% (based on simulations),
- Neodymium magnets prove to be remarkably resistant to loss of magnetic properties caused by external interference,
- A magnet with a metallic gold surface looks better,
- Neodymium magnets deliver maximum magnetic induction on a their surface, which allows for strong attraction,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
- Thanks to the potential of free shaping and customization to specialized requirements, NdFeB magnets can be modeled in a wide range of forms and dimensions, which makes them more universal,
- Universal use in electronics industry – they serve a role in hard drives, drive modules, precision medical tools, and industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices
Weaknesses
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. 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 magnets in rubber or plastics, which prevent oxidation and corrosion.
- We recommend casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
- Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these devices can complicate diagnosis medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
- whose transverse dimension reaches at least 10 mm
- with a surface cleaned and smooth
- without any clearance between the magnet and steel
- during detachment in a direction vertical to the plane
- at conditions approx. 20°C
Lifting capacity in practice – influencing factors
- Space between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
- Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.
Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Phone sensors
Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.
ICD Warning
People with a heart stimulator must keep an large gap from magnets. The magnetic field can interfere with the functioning of the life-saving device.
Fire risk
Powder generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Hand protection
Big blocks can smash fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.
Adults only
Absolutely store magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are very dangerous.
Power loss in heat
Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and strength.
Material brittleness
Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.
Electronic devices
Data protection: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).
Allergy Warning
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness appears, immediately stop handling magnets and use protective gear.
Caution required
Use magnets with awareness. Their huge power can surprise even experienced users. Stay alert and do not underestimate their power.
