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 - 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 |
Technical simulation of the assembly - data
Presented values are the outcome of a physical simulation. Values rely on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Please consider these data as a reference point when designing systems.
Table 1: Static pull force (force vs distance) - power drop
MW 29x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
3518 Gs
351.8 mT
|
20.82 kg / 20820.0 g
204.2 N
|
dangerous! |
| 1 mm |
3321 Gs
332.1 mT
|
18.55 kg / 18548.8 g
182.0 N
|
dangerous! |
| 2 mm |
3106 Gs
310.6 mT
|
16.23 kg / 16226.1 g
159.2 N
|
dangerous! |
| 3 mm |
2883 Gs
288.3 mT
|
13.98 kg / 13978.2 g
137.1 N
|
dangerous! |
| 5 mm |
2437 Gs
243.7 mT
|
9.99 kg / 9987.1 g
98.0 N
|
strong |
| 10 mm |
1500 Gs
150.0 mT
|
3.78 kg / 3783.1 g
37.1 N
|
strong |
| 15 mm |
905 Gs
90.5 mT
|
1.38 kg / 1379.2 g
13.5 N
|
low risk |
| 20 mm |
563 Gs
56.3 mT
|
0.53 kg / 532.4 g
5.2 N
|
low risk |
| 30 mm |
247 Gs
24.7 mT
|
0.10 kg / 102.4 g
1.0 N
|
low risk |
| 50 mm |
72 Gs
7.2 mT
|
0.01 kg / 8.7 g
0.1 N
|
low risk |
Table 2: Shear force (wall)
MW 29x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.16 kg / 4164.0 g
40.8 N
|
| 1 mm | Stal (~0.2) |
3.71 kg / 3710.0 g
36.4 N
|
| 2 mm | Stal (~0.2) |
3.25 kg / 3246.0 g
31.8 N
|
| 3 mm | Stal (~0.2) |
2.80 kg / 2796.0 g
27.4 N
|
| 5 mm | Stal (~0.2) |
2.00 kg / 1998.0 g
19.6 N
|
| 10 mm | Stal (~0.2) |
0.76 kg / 756.0 g
7.4 N
|
| 15 mm | Stal (~0.2) |
0.28 kg / 276.0 g
2.7 N
|
| 20 mm | Stal (~0.2) |
0.11 kg / 106.0 g
1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 20.0 g
0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
Table 3: Vertical assembly (sliding) - vertical pull
MW 29x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
6.25 kg / 6246.0 g
61.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.16 kg / 4164.0 g
40.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.08 kg / 2082.0 g
20.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.41 kg / 10410.0 g
102.1 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 29x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
1.04 kg / 1041.0 g
10.2 N
|
| 1 mm |
|
2.60 kg / 2602.5 g
25.5 N
|
| 2 mm |
|
5.21 kg / 5205.0 g
51.1 N
|
| 5 mm |
|
13.01 kg / 13012.5 g
127.7 N
|
| 10 mm |
|
20.82 kg / 20820.0 g
204.2 N
|
Table 5: Thermal stability (stability) - resistance threshold
MW 29x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
20.82 kg / 20820.0 g
204.2 N
|
OK |
| 40 °C | -2.2% |
20.36 kg / 20362.0 g
199.8 N
|
OK |
| 60 °C | -4.4% |
19.90 kg / 19903.9 g
195.3 N
|
|
| 80 °C | -6.6% |
19.45 kg / 19445.9 g
190.8 N
|
|
| 100 °C | -28.8% |
14.82 kg / 14823.8 g
145.4 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 29x10 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
50.40 kg / 50399 g
494.4 N
5 016 Gs
|
N/A |
| 1 mm |
47.70 kg / 47704 g
468.0 N
6 845 Gs
|
42.93 kg / 42934 g
421.2 N
~0 Gs
|
| 2 mm |
44.90 kg / 44901 g
440.5 N
6 641 Gs
|
40.41 kg / 40411 g
396.4 N
~0 Gs
|
| 3 mm |
42.08 kg / 42082 g
412.8 N
6 429 Gs
|
37.87 kg / 37874 g
371.5 N
~0 Gs
|
| 5 mm |
36.52 kg / 36522 g
358.3 N
5 990 Gs
|
32.87 kg / 32870 g
322.5 N
~0 Gs
|
| 10 mm |
24.18 kg / 24176 g
237.2 N
4 873 Gs
|
21.76 kg / 21758 g
213.4 N
~0 Gs
|
| 20 mm |
9.16 kg / 9158 g
89.8 N
2 999 Gs
|
8.24 kg / 8242 g
80.9 N
~0 Gs
|
| 50 mm |
0.54 kg / 542 g
5.3 N
729 Gs
|
0.49 kg / 487 g
4.8 N
~0 Gs
|
Table 7: Hazards (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: Dynamics (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: Surface protection spec
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. Shear force
*Note: On a vertical wall, the magnet retains merely a fraction of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Thermal stability
*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) = 0.45
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% |
Ecology and recycling (GPSR)
| 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 rare earth magnets.
Pros
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
- They retain their magnetic properties even under close interference source,
- In other words, due to the smooth surface of gold, the element gains a professional look,
- The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to versatility in shaping and the ability to adapt to client solutions,
- Universal use in innovative solutions – they are utilized in data components, drive modules, advanced medical instruments, as well as complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Limitations
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
- Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices can disrupt the diagnostic process 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
Maximum lifting force for a neodymium magnet – what it depends on?
- with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
- whose transverse dimension equals approx. 10 mm
- characterized by lack of roughness
- under conditions of no distance (metal-to-metal)
- during pulling in a direction vertical to the mounting surface
- at conditions approx. 20°C
Lifting capacity in practice – influencing factors
- Distance – existence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
- Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate lowers the lifting capacity.
H&S for magnets
Serious injuries
Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!
Keep away from children
Strictly store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are life-threatening.
Heat warning
Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. Damage is permanent.
Do not underestimate power
Exercise caution. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can react.
Impact on smartphones
Note: neodymium magnets generate a field that interferes with sensitive sensors. Maintain a safe distance from your phone, device, and GPS.
Risk of cracking
Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.
Fire risk
Mechanical processing of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Magnetic media
Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.
Allergy Warning
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease handling magnets and wear gloves.
Medical implants
Patients with a pacemaker must keep an safe separation from magnets. The magnetism can stop the operation of the implant.
