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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Detailed specification - 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 - data
These data represent the result of a engineering simulation. Results rely on models for the material Nd2Fe14B. Actual parameters might slightly differ. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
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
|
warning |
| 15 mm |
930 Gs
93.0 mT
|
1.57 kg / 3.45 lbs
1565.8 g / 15.4 N
|
low risk |
| 20 mm |
583 Gs
58.3 mT
|
0.62 kg / 1.36 lbs
616.0 g / 6.0 N
|
low risk |
| 30 mm |
258 Gs
25.8 mT
|
0.12 kg / 0.27 lbs
121.0 g / 1.2 N
|
low risk |
| 50 mm |
76 Gs
7.6 mT
|
0.01 kg / 0.02 lbs
10.4 g / 0.1 N
|
low risk |
Table 2: Vertical force (vertical surface)
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 (sliding) - behavior on slippery surfaces
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: Steel thickness (saturation) - power losses
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 (attraction) - field range
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 |
| Timepiece | 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: Collisions (kinetic energy) - warning
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: Anti-corrosion coating durability
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: Construction 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: Hydrostatics and buoyancy
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. Sliding resistance
*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Power loss vs temp
*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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also deals
Advantages as well as disadvantages of rare earth magnets.
Benefits
- Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
- Magnets effectively defend themselves against demagnetization caused by foreign field sources,
- By applying a lustrous layer of silver, the element presents an nice look,
- Neodymium magnets achieve maximum magnetic induction on a contact point, which increases force concentration,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Thanks to freedom in shaping and the capacity to customize to individual projects,
- Significant place in modern industrial fields – they are used in computer drives, brushless drives, precision medical tools, and modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited possibility of making nuts in the magnet and complicated shapes - preferred is cover - magnet mounting.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices are able to complicate diagnosis medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Highest magnetic holding force – what contributes to it?
- using a plate made of high-permeability steel, serving as a magnetic yoke
- whose thickness equals approx. 10 mm
- with an polished touching surface
- with total lack of distance (without coatings)
- for force applied at a right angle (pull-off, not shear)
- at conditions approx. 20°C
Determinants of lifting force in real conditions
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Angle of force application – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Steel type – mild steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
- Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.
H&S for magnets
Powerful field
Handle with care. Neodymium magnets act from a long distance and connect with massive power, often faster than you can react.
GPS Danger
Remember: neodymium magnets produce a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.
Data carriers
Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.
Physical harm
Big blocks can smash fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.
Thermal limits
Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.
Skin irritation risks
It is widely known that nickel (the usual finish) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands or select coated magnets.
Dust explosion hazard
Powder produced during machining of magnets is combustible. Do not drill into magnets unless you are an expert.
Keep away from children
Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are very dangerous.
Medical implants
Patients with a heart stimulator have to keep an large gap from magnets. The magnetism can stop the operation of the implant.
Protective goggles
Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
