MW 28.9x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010051
GTIN/EAN: 5906301810506
- Diameter Ø
- 28.9 mm [±0,1 mm]
- Height
- 10 mm [±0,1 mm]
- Weight
- 49.2 g
- Magnetization Direction
- → diametrical
- Coating
- [NiCuNi] Nickel
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Technical of the product - MW 28.9x10 / N38 - cylindrical magnet
Specification / characteristics - MW 28.9x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010051 |
| GTIN/EAN | 5906301810506 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 28.9 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 49.2 g |
| Magnetization Direction | → diametrical |
| Load capacity ~ ? | 20.74 kg / 203.46 N |
| Magnetic Induction ~ ? | 352.70 mT / 3527 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 - data
Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.
Table 1: Static force (pull vs distance) - characteristics
MW 28.9x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3526 Gs
352.6 mT
|
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
|
critical level |
| 1 mm |
3327 Gs
332.7 mT
|
18.47 kg / 40.71 LBS
18466.2 g / 181.2 N
|
critical level |
| 2 mm |
3111 Gs
311.1 mT
|
16.14 kg / 35.59 LBS
16142.6 g / 158.4 N
|
critical level |
| 3 mm |
2886 Gs
288.6 mT
|
13.90 kg / 30.63 LBS
13895.8 g / 136.3 N
|
critical level |
| 5 mm |
2438 Gs
243.8 mT
|
9.91 kg / 21.85 LBS
9912.0 g / 97.2 N
|
strong |
| 10 mm |
1497 Gs
149.7 mT
|
3.74 kg / 8.24 LBS
3739.6 g / 36.7 N
|
strong |
| 15 mm |
903 Gs
90.3 mT
|
1.36 kg / 3.00 LBS
1359.1 g / 13.3 N
|
weak grip |
| 20 mm |
560 Gs
56.0 mT
|
0.52 kg / 1.15 LBS
523.5 g / 5.1 N
|
weak grip |
| 30 mm |
245 Gs
24.5 mT
|
0.10 kg / 0.22 LBS
100.4 g / 1.0 N
|
weak grip |
| 50 mm |
71 Gs
7.1 mT
|
0.01 kg / 0.02 LBS
8.5 g / 0.1 N
|
weak grip |
Table 2: Sliding hold (vertical surface)
MW 28.9x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.15 kg / 9.14 LBS
4148.0 g / 40.7 N
|
| 1 mm | Stal (~0.2) |
3.69 kg / 8.14 LBS
3694.0 g / 36.2 N
|
| 2 mm | Stal (~0.2) |
3.23 kg / 7.12 LBS
3228.0 g / 31.7 N
|
| 3 mm | Stal (~0.2) |
2.78 kg / 6.13 LBS
2780.0 g / 27.3 N
|
| 5 mm | Stal (~0.2) |
1.98 kg / 4.37 LBS
1982.0 g / 19.4 N
|
| 10 mm | Stal (~0.2) |
0.75 kg / 1.65 LBS
748.0 g / 7.3 N
|
| 15 mm | Stal (~0.2) |
0.27 kg / 0.60 LBS
272.0 g / 2.7 N
|
| 20 mm | Stal (~0.2) |
0.10 kg / 0.23 LBS
104.0 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) - vertical pull
MW 28.9x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
6.22 kg / 13.72 LBS
6222.0 g / 61.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.15 kg / 9.14 LBS
4148.0 g / 40.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.07 kg / 4.57 LBS
2074.0 g / 20.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.37 kg / 22.86 LBS
10370.0 g / 101.7 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 28.9x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.04 kg / 2.29 LBS
1037.0 g / 10.2 N
|
| 1 mm |
|
2.59 kg / 5.72 LBS
2592.5 g / 25.4 N
|
| 2 mm |
|
5.19 kg / 11.43 LBS
5185.0 g / 50.9 N
|
| 3 mm |
|
7.78 kg / 17.15 LBS
7777.5 g / 76.3 N
|
| 5 mm |
|
12.96 kg / 28.58 LBS
12962.5 g / 127.2 N
|
| 10 mm |
|
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
|
| 11 mm |
|
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
|
| 12 mm |
|
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
|
Table 5: Thermal stability (stability) - power drop
MW 28.9x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
|
OK |
| 40 °C | -2.2% |
20.28 kg / 44.72 LBS
20283.7 g / 199.0 N
|
OK |
| 60 °C | -4.4% |
19.83 kg / 43.71 LBS
19827.4 g / 194.5 N
|
|
| 80 °C | -6.6% |
19.37 kg / 42.71 LBS
19371.2 g / 190.0 N
|
|
| 100 °C | -28.8% |
14.77 kg / 32.56 LBS
14766.9 g / 144.9 N
|
Table 6: Two magnets (repulsion) - field collision
MW 28.9x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
50.29 kg / 110.86 LBS
5 022 Gs
|
7.54 kg / 16.63 LBS
7543 g / 74.0 N
|
N/A |
| 1 mm |
47.58 kg / 104.90 LBS
6 860 Gs
|
7.14 kg / 15.74 LBS
7138 g / 70.0 N
|
42.83 kg / 94.41 LBS
~0 Gs
|
| 2 mm |
44.77 kg / 98.71 LBS
6 655 Gs
|
6.72 kg / 14.81 LBS
6716 g / 65.9 N
|
40.30 kg / 88.84 LBS
~0 Gs
|
| 3 mm |
41.95 kg / 92.48 LBS
6 441 Gs
|
6.29 kg / 13.87 LBS
6292 g / 61.7 N
|
37.75 kg / 83.23 LBS
~0 Gs
|
| 5 mm |
36.38 kg / 80.20 LBS
5 999 Gs
|
5.46 kg / 12.03 LBS
5457 g / 53.5 N
|
32.74 kg / 72.18 LBS
~0 Gs
|
| 10 mm |
24.03 kg / 52.98 LBS
4 876 Gs
|
3.60 kg / 7.95 LBS
3605 g / 35.4 N
|
21.63 kg / 47.69 LBS
~0 Gs
|
| 20 mm |
9.07 kg / 19.99 LBS
2 995 Gs
|
1.36 kg / 3.00 LBS
1360 g / 13.3 N
|
8.16 kg / 17.99 LBS
~0 Gs
|
| 50 mm |
0.53 kg / 1.17 LBS
726 Gs
|
0.08 kg / 0.18 LBS
80 g / 0.8 N
|
0.48 kg / 1.06 LBS
~0 Gs
|
| 60 mm |
0.24 kg / 0.54 LBS
491 Gs
|
0.04 kg / 0.08 LBS
37 g / 0.4 N
|
0.22 kg / 0.48 LBS
~0 Gs
|
| 70 mm |
0.12 kg / 0.26 LBS
345 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
250 Gs
|
0.01 kg / 0.02 LBS
9 g / 0.1 N
|
0.06 kg / 0.13 LBS
~0 Gs
|
| 90 mm |
0.04 kg / 0.08 LBS
187 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
143 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.04 LBS
~0 Gs
|
Table 7: Hazards (implants) - warnings
MW 28.9x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Mobile device | 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 (kinetic energy) - warning
MW 28.9x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
23.58 km/h
(6.55 m/s)
|
1.06 J | |
| 30 mm |
25.54 km/h
(7.09 m/s)
|
1.24 J | |
| 50 mm |
25.61 km/h
(7.11 m/s)
|
1.24 J | |
| 100 mm |
25.62 km/h
(7.12 m/s)
|
1.25 J |
Table 9: Anti-corrosion coating durability
MW 28.9x10 / 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: Construction data (Flux)
MW 28.9x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 24 347 Mx | 243.5 µWb |
| Pc Coefficient | 0.45 | Low (Flat) |
Table 11: Physics of underwater searching
MW 28.9x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 20.74 kg | Standard |
| Water (riverbed) |
23.75 kg
(+3.01 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Heat tolerance
*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
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.
Elemental analysis
| 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 offers
Advantages as well as disadvantages of Nd2Fe14B magnets.
Advantages
- Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
- They maintain their magnetic properties even under external field action,
- In other words, due to the shiny finish of nickel, the element gains visual value,
- Magnets are characterized by maximum magnetic induction on the outer side,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to flexibility in constructing and the ability to customize to specific needs,
- Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions
Weaknesses
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- Neodymium magnets decrease their power 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 stability even at temperatures up to 230°C
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
- Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
- Due to neodymium price, their price is higher than average,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- on a block made of structural steel, effectively closing the magnetic field
- whose transverse dimension reaches at least 10 mm
- with a surface cleaned and smooth
- without the slightest clearance between the magnet and steel
- under axial force direction (90-degree angle)
- at standard ambient temperature
Lifting capacity in real conditions – factors
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
- Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
- Temperature – temperature increase results in weakening of induction. 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 the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.
Precautions when working with neodymium magnets
Safe distance
Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.
Compass and GPS
A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.
Product not for children
These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.
Handling guide
Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.
Shattering risk
Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.
Health Danger
Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Dust is flammable
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.
Maximum temperature
Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).
Pinching danger
Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Warning for allergy sufferers
Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.
