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 |
Physical modeling of the magnet - data
The following information are the direct effect of a mathematical calculation. Values rely on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these data as a reference point during assembly planning.
Table 1: Static pull force (pull vs distance) - characteristics
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 lbs
20820.0 g / 204.2 N
|
crushing |
| 1 mm |
3321 Gs
332.1 mT
|
18.55 kg / 40.89 lbs
18548.8 g / 182.0 N
|
crushing |
| 2 mm |
3106 Gs
310.6 mT
|
16.23 kg / 35.77 lbs
16226.1 g / 159.2 N
|
crushing |
| 3 mm |
2883 Gs
288.3 mT
|
13.98 kg / 30.82 lbs
13978.2 g / 137.1 N
|
crushing |
| 5 mm |
2437 Gs
243.7 mT
|
9.99 kg / 22.02 lbs
9987.1 g / 98.0 N
|
medium risk |
| 10 mm |
1500 Gs
150.0 mT
|
3.78 kg / 8.34 lbs
3783.1 g / 37.1 N
|
medium risk |
| 15 mm |
905 Gs
90.5 mT
|
1.38 kg / 3.04 lbs
1379.2 g / 13.5 N
|
low risk |
| 20 mm |
563 Gs
56.3 mT
|
0.53 kg / 1.17 lbs
532.4 g / 5.2 N
|
low risk |
| 30 mm |
247 Gs
24.7 mT
|
0.10 kg / 0.23 lbs
102.4 g / 1.0 N
|
low risk |
| 50 mm |
72 Gs
7.2 mT
|
0.01 kg / 0.02 lbs
8.7 g / 0.1 N
|
low risk |
Table 2: Sliding capacity (wall)
MW 29x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.16 kg / 9.18 lbs
4164.0 g / 40.8 N
|
| 1 mm | Stal (~0.2) |
3.71 kg / 8.18 lbs
3710.0 g / 36.4 N
|
| 2 mm | Stal (~0.2) |
3.25 kg / 7.16 lbs
3246.0 g / 31.8 N
|
| 3 mm | Stal (~0.2) |
2.80 kg / 6.16 lbs
2796.0 g / 27.4 N
|
| 5 mm | Stal (~0.2) |
2.00 kg / 4.40 lbs
1998.0 g / 19.6 N
|
| 10 mm | Stal (~0.2) |
0.76 kg / 1.67 lbs
756.0 g / 7.4 N
|
| 15 mm | Stal (~0.2) |
0.28 kg / 0.61 lbs
276.0 g / 2.7 N
|
| 20 mm | Stal (~0.2) |
0.11 kg / 0.23 lbs
106.0 g / 1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
20.0 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) - 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 lbs
6246.0 g / 61.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.16 kg / 9.18 lbs
4164.0 g / 40.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.08 kg / 4.59 lbs
2082.0 g / 20.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.41 kg / 22.95 lbs
10410.0 g / 102.1 N
|
Table 4: Steel thickness (substrate influence) - 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 lbs
1041.0 g / 10.2 N
|
| 1 mm |
|
2.60 kg / 5.74 lbs
2602.5 g / 25.5 N
|
| 2 mm |
|
5.21 kg / 11.48 lbs
5205.0 g / 51.1 N
|
| 3 mm |
|
7.81 kg / 17.21 lbs
7807.5 g / 76.6 N
|
| 5 mm |
|
13.01 kg / 28.69 lbs
13012.5 g / 127.7 N
|
| 10 mm |
|
20.82 kg / 45.90 lbs
20820.0 g / 204.2 N
|
| 11 mm |
|
20.82 kg / 45.90 lbs
20820.0 g / 204.2 N
|
| 12 mm |
|
20.82 kg / 45.90 lbs
20820.0 g / 204.2 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MW 29x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
20.82 kg / 45.90 lbs
20820.0 g / 204.2 N
|
OK |
| 40 °C | -2.2% |
20.36 kg / 44.89 lbs
20362.0 g / 199.8 N
|
OK |
| 60 °C | -4.4% |
19.90 kg / 43.88 lbs
19903.9 g / 195.3 N
|
|
| 80 °C | -6.6% |
19.45 kg / 42.87 lbs
19445.9 g / 190.8 N
|
|
| 100 °C | -28.8% |
14.82 kg / 32.68 lbs
14823.8 g / 145.4 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
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 lbs
5 016 Gs
|
7.56 kg / 16.67 lbs
7560 g / 74.2 N
|
N/A |
| 1 mm |
47.70 kg / 105.17 lbs
6 845 Gs
|
7.16 kg / 15.78 lbs
7156 g / 70.2 N
|
42.93 kg / 94.65 lbs
~0 Gs
|
| 2 mm |
44.90 kg / 98.99 lbs
6 641 Gs
|
6.74 kg / 14.85 lbs
6735 g / 66.1 N
|
40.41 kg / 89.09 lbs
~0 Gs
|
| 3 mm |
42.08 kg / 92.77 lbs
6 429 Gs
|
6.31 kg / 13.92 lbs
6312 g / 61.9 N
|
37.87 kg / 83.50 lbs
~0 Gs
|
| 5 mm |
36.52 kg / 80.52 lbs
5 990 Gs
|
5.48 kg / 12.08 lbs
5478 g / 53.7 N
|
32.87 kg / 72.47 lbs
~0 Gs
|
| 10 mm |
24.18 kg / 53.30 lbs
4 873 Gs
|
3.63 kg / 7.99 lbs
3626 g / 35.6 N
|
21.76 kg / 47.97 lbs
~0 Gs
|
| 20 mm |
9.16 kg / 20.19 lbs
2 999 Gs
|
1.37 kg / 3.03 lbs
1374 g / 13.5 N
|
8.24 kg / 18.17 lbs
~0 Gs
|
| 50 mm |
0.54 kg / 1.19 lbs
729 Gs
|
0.08 kg / 0.18 lbs
81 g / 0.8 N
|
0.49 kg / 1.07 lbs
~0 Gs
|
| 60 mm |
0.25 kg / 0.55 lbs
493 Gs
|
0.04 kg / 0.08 lbs
37 g / 0.4 N
|
0.22 kg / 0.49 lbs
~0 Gs
|
| 70 mm |
0.12 kg / 0.27 lbs
347 Gs
|
0.02 kg / 0.04 lbs
18 g / 0.2 N
|
0.11 kg / 0.24 lbs
~0 Gs
|
| 80 mm |
0.06 kg / 0.14 lbs
252 Gs
|
0.01 kg / 0.02 lbs
10 g / 0.1 N
|
0.06 kg / 0.13 lbs
~0 Gs
|
| 90 mm |
0.04 kg / 0.08 lbs
188 Gs
|
0.01 kg / 0.01 lbs
5 g / 0.1 N
|
0.03 kg / 0.07 lbs
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 lbs
144 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.04 lbs
~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 |
| Remote | 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 (cracking risk) - 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 (Flux)
MW 29x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 24 471 Mx | 244.7 µWb |
| Pc Coefficient | 0.45 | Low (Flat) |
Table 11: Submerged application
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. Sliding resistance
*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Temperature resistance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.45
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages and disadvantages of rare earth magnets.
Advantages
- They do not lose magnetism, even during nearly ten years – the drop in lifting capacity is only ~1% (according to tests),
- Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by external magnetic fields,
- In other words, due to the reflective finish of nickel, the element gains a professional look,
- Magnets exhibit extremely high magnetic induction on the outer side,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of custom creating as well as modifying to individual applications,
- Wide application in modern technologies – they are commonly used in hard drives, electromotive mechanisms, advanced medical instruments, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in small systems
Weaknesses
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited ability of creating nuts in the magnet and complex forms - recommended is a housing - magnetic holder.
- Health risk related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these products are able to disrupt the diagnostic process medical after entering the body.
- Due to complex production process, their price exceeds standard values,
Lifting parameters
Maximum holding power of the magnet – what contributes to it?
- with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
- possessing a massiveness of minimum 10 mm to avoid saturation
- with a plane perfectly flat
- with zero gap (no coatings)
- for force applied at a right angle (in the magnet axis)
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
- Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
H&S for magnets
Cards and drives
Avoid bringing magnets close to a purse, computer, or screen. The magnetism can destroy these devices and wipe information from cards.
Warning for heart patients
For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.
Maximum temperature
Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Hand protection
Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Protective goggles
Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Metal Allergy
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease handling magnets and use protective gear.
Product not for children
Neodymium magnets are not toys. Eating multiple magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.
Flammability
Powder produced during machining of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Handling rules
Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
GPS and phone interference
Note: rare earth magnets generate a field that disrupts precision electronics. Keep a separation from your mobile, device, and navigation systems.
