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
24.60 ZŁ with VAT / pcs + price for transport
20.00 ZŁ net + 23% VAT / pcs
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Product card - 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 |
Engineering modeling of the assembly - report
These values constitute the outcome of a mathematical calculation. Values were calculated on models for the material Nd2Fe14B. Real-world conditions may differ. Use these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs gap) - power drop
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 lbs
21500.0 g / 210.9 N
|
crushing |
| 1 mm |
3261 Gs
326.1 mT
|
19.26 kg / 42.45 lbs
19256.6 g / 188.9 N
|
crushing |
| 2 mm |
3059 Gs
305.9 mT
|
16.95 kg / 37.36 lbs
16947.4 g / 166.3 N
|
crushing |
| 3 mm |
2848 Gs
284.8 mT
|
14.70 kg / 32.40 lbs
14696.2 g / 144.2 N
|
crushing |
| 5 mm |
2425 Gs
242.5 mT
|
10.65 kg / 23.48 lbs
10650.1 g / 104.5 N
|
crushing |
| 10 mm |
1519 Gs
151.9 mT
|
4.18 kg / 9.21 lbs
4178.4 g / 41.0 N
|
strong |
| 15 mm |
930 Gs
93.0 mT
|
1.57 kg / 3.45 lbs
1565.8 g / 15.4 N
|
weak grip |
| 20 mm |
583 Gs
58.3 mT
|
0.62 kg / 1.36 lbs
616.0 g / 6.0 N
|
weak grip |
| 30 mm |
258 Gs
25.8 mT
|
0.12 kg / 0.27 lbs
121.0 g / 1.2 N
|
weak grip |
| 50 mm |
76 Gs
7.6 mT
|
0.01 kg / 0.02 lbs
10.4 g / 0.1 N
|
weak grip |
Table 2: Vertical force (wall)
MW 29.9x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.30 kg / 9.48 lbs
4300.0 g / 42.2 N
|
| 1 mm | Stal (~0.2) |
3.85 kg / 8.49 lbs
3852.0 g / 37.8 N
|
| 2 mm | Stal (~0.2) |
3.39 kg / 7.47 lbs
3390.0 g / 33.3 N
|
| 3 mm | Stal (~0.2) |
2.94 kg / 6.48 lbs
2940.0 g / 28.8 N
|
| 5 mm | Stal (~0.2) |
2.13 kg / 4.70 lbs
2130.0 g / 20.9 N
|
| 10 mm | Stal (~0.2) |
0.84 kg / 1.84 lbs
836.0 g / 8.2 N
|
| 15 mm | Stal (~0.2) |
0.31 kg / 0.69 lbs
314.0 g / 3.1 N
|
| 20 mm | Stal (~0.2) |
0.12 kg / 0.27 lbs
124.0 g / 1.2 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
24.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
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 lbs
6450.0 g / 63.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.30 kg / 9.48 lbs
4300.0 g / 42.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.15 kg / 4.74 lbs
2150.0 g / 21.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.75 kg / 23.70 lbs
10750.0 g / 105.5 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 29.9x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.08 kg / 2.37 lbs
1075.0 g / 10.5 N
|
| 1 mm |
|
2.69 kg / 5.92 lbs
2687.5 g / 26.4 N
|
| 2 mm |
|
5.38 kg / 11.85 lbs
5375.0 g / 52.7 N
|
| 3 mm |
|
8.06 kg / 17.77 lbs
8062.5 g / 79.1 N
|
| 5 mm |
|
13.44 kg / 29.62 lbs
13437.5 g / 131.8 N
|
| 10 mm |
|
21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
|
| 11 mm |
|
21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
|
| 12 mm |
|
21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
|
Table 5: Thermal stability (material behavior) - thermal limit
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 lbs
21500.0 g / 210.9 N
|
OK |
| 40 °C | -2.2% |
21.03 kg / 46.36 lbs
21027.0 g / 206.3 N
|
OK |
| 60 °C | -4.4% |
20.55 kg / 45.31 lbs
20554.0 g / 201.6 N
|
|
| 80 °C | -6.6% |
20.08 kg / 44.27 lbs
20081.0 g / 197.0 N
|
|
| 100 °C | -28.8% |
15.31 kg / 33.75 lbs
15308.0 g / 150.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 29.9x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
51.38 kg / 113.28 lbs
4 963 Gs
|
7.71 kg / 16.99 lbs
7708 g / 75.6 N
|
N/A |
| 1 mm |
48.76 kg / 107.50 lbs
6 712 Gs
|
7.31 kg / 16.12 lbs
7314 g / 71.7 N
|
43.88 kg / 96.75 lbs
~0 Gs
|
| 2 mm |
46.02 kg / 101.46 lbs
6 521 Gs
|
6.90 kg / 15.22 lbs
6903 g / 67.7 N
|
41.42 kg / 91.32 lbs
~0 Gs
|
| 3 mm |
43.26 kg / 95.37 lbs
6 322 Gs
|
6.49 kg / 14.31 lbs
6489 g / 63.7 N
|
38.93 kg / 85.83 lbs
~0 Gs
|
| 5 mm |
37.78 kg / 83.30 lbs
5 909 Gs
|
5.67 kg / 12.49 lbs
5667 g / 55.6 N
|
34.00 kg / 74.97 lbs
~0 Gs
|
| 10 mm |
25.45 kg / 56.11 lbs
4 850 Gs
|
3.82 kg / 8.42 lbs
3818 g / 37.5 N
|
22.91 kg / 50.50 lbs
~0 Gs
|
| 20 mm |
9.99 kg / 22.02 lbs
3 038 Gs
|
1.50 kg / 3.30 lbs
1498 g / 14.7 N
|
8.99 kg / 19.81 lbs
~0 Gs
|
| 50 mm |
0.63 kg / 1.38 lbs
761 Gs
|
0.09 kg / 0.21 lbs
94 g / 0.9 N
|
0.56 kg / 1.24 lbs
~0 Gs
|
| 60 mm |
0.29 kg / 0.64 lbs
517 Gs
|
0.04 kg / 0.10 lbs
43 g / 0.4 N
|
0.26 kg / 0.57 lbs
~0 Gs
|
| 70 mm |
0.14 kg / 0.32 lbs
364 Gs
|
0.02 kg / 0.05 lbs
22 g / 0.2 N
|
0.13 kg / 0.28 lbs
~0 Gs
|
| 80 mm |
0.08 kg / 0.17 lbs
265 Gs
|
0.01 kg / 0.03 lbs
11 g / 0.1 N
|
0.07 kg / 0.15 lbs
~0 Gs
|
| 90 mm |
0.04 kg / 0.09 lbs
198 Gs
|
0.01 kg / 0.01 lbs
6 g / 0.1 N
|
0.04 kg / 0.08 lbs
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 lbs
152 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.02 kg / 0.05 lbs
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
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 |
| 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: Dynamics (cracking risk) - collision effects
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: Corrosion resistance
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 (Pc)
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: Submerged application
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. Shear force
*Warning: On a vertical wall, the magnet retains just a fraction of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) significantly 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
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Advantages and disadvantages of Nd2Fe14B magnets.
Pros
- Their magnetic field is maintained, and after around ten years it decreases only by ~1% (theoretically),
- They possess excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
- The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Neodymium magnets deliver maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures reaching 230°C and above...
- Thanks to the possibility of accurate molding and customization to custom solutions, neodymium magnets can be produced in a variety of shapes and sizes, which increases their versatility,
- Significant place in advanced technology sectors – they serve a role in hard drives, motor assemblies, advanced medical instruments, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating threads and complicated forms in magnets, we propose using cover - magnetic mechanism.
- Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to be problematic in diagnostics 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
Maximum magnetic pulling force – what it depends on?
- with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
- possessing a thickness of min. 10 mm to ensure full flux closure
- characterized by even structure
- without the slightest air gap between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- in temp. approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Distance – existence of any layer (rust, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
- Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
- Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).
Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the holding force.
Warnings
This is not a toy
NdFeB magnets are not toys. Accidental ingestion of multiple magnets can lead to them attracting across intestines, which constitutes a direct threat to life and requires urgent medical intervention.
Bodily injuries
Big blocks can crush fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.
Powerful field
Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often faster than you can move away.
Material brittleness
Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.
Medical implants
Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Threat to electronics
Data protection: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, timepieces).
GPS Danger
An intense magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.
Power loss in heat
Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.
Metal Allergy
It is widely known that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, avoid direct skin contact and choose encased magnets.
Fire warning
Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
