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
Load capacity
20.74 kg / 203.46 N
Magnetic Induction
352.70 mT / 3527 Gs
Coating
[NiCuNi] Nickel
23.99 ZŁ with VAT / pcs + price for transport
19.50 ZŁ net + 23% VAT / pcs
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Technical parameters - 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 |
Physical analysis of the magnet - data
These values represent the result of a physical calculation. Values rely on models for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force 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
|
crushing |
| 1 mm |
3327 Gs
332.7 mT
|
18.47 kg / 40.71 lbs
18466.2 g / 181.2 N
|
crushing |
| 2 mm |
3111 Gs
311.1 mT
|
16.14 kg / 35.59 lbs
16142.6 g / 158.4 N
|
crushing |
| 3 mm |
2886 Gs
288.6 mT
|
13.90 kg / 30.63 lbs
13895.8 g / 136.3 N
|
crushing |
| 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
|
safe |
| 20 mm |
560 Gs
56.0 mT
|
0.52 kg / 1.15 lbs
523.5 g / 5.1 N
|
safe |
| 30 mm |
245 Gs
24.5 mT
|
0.10 kg / 0.22 lbs
100.4 g / 1.0 N
|
safe |
| 50 mm |
71 Gs
7.1 mT
|
0.01 kg / 0.02 lbs
8.5 g / 0.1 N
|
safe |
Table 2: Shear capacity (wall)
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) - power losses
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: Working in heat (stability) - resistance threshold
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) - precautionary measures
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 |
| 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) - collision effects
MW 28.9x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.92 km/h
(6.37 m/s)
|
1.00 J | |
| 30 mm |
35.97 km/h
(9.99 m/s)
|
2.46 J | |
| 50 mm |
46.31 km/h
(12.86 m/s)
|
4.07 J | |
| 100 mm |
65.48 km/h
(18.19 m/s)
|
8.14 J |
Table 9: Surface protection spec
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 (Pc)
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: Hydrostatics and buoyancy
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
*Warning: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.
3. Temperature resistance
*For N38 material, the critical 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.
Material specification
| 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 |
Other proposals
Advantages as well as disadvantages of neodymium magnets.
Strengths
- They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
- They show high resistance to demagnetization induced by external field influence,
- A magnet with a shiny nickel surface looks better,
- The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to freedom in shaping and the capacity to adapt to unusual requirements,
- Versatile presence in future technologies – they serve a role in computer drives, electric motors, advanced medical instruments, also multitasking production systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Weaknesses
- At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease 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 stability even at temperatures up to 230°C
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Limited ability of producing nuts in the magnet and complicated shapes - recommended is casing - magnetic holder.
- Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
- Due to neodymium price, their price exceeds standard values,
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- using a sheet made of high-permeability steel, functioning as a magnetic yoke
- possessing a massiveness of min. 10 mm to ensure full flux closure
- with an ideally smooth touching surface
- with direct contact (without impurities)
- during detachment in a direction perpendicular to the mounting surface
- at ambient temperature room level
Key elements affecting lifting force
- Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick plate does not close the flux, causing part of the power to be escaped into the air.
- Steel type – mild steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.
H&S for magnets
Powerful field
Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Warning for heart patients
Individuals with a ICD have to keep an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.
Impact on smartphones
Note: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, device, and GPS.
Maximum temperature
Control the heat. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.
Pinching danger
Large magnets can smash fingers instantly. Do not place your hand betwixt two strong magnets.
Keep away from computers
Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).
Dust explosion hazard
Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Metal Allergy
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation appears, cease handling magnets and wear gloves.
Beware of splinters
Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.
Choking Hazard
Neodymium magnets are not intended for children. Eating several magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and requires immediate surgery.
