MW 45x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010070
GTIN/EAN: 5906301810698
Diameter Ø
45 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
178.92 g
Magnetization Direction
↑ axial
Load capacity
48.55 kg / 476.32 N
Magnetic Induction
343.84 mT / 3438 Gs
Coating
[NiCuNi] Nickel
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Technical - MW 45x15 / N38 - cylindrical magnet
Specification / characteristics - MW 45x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010070 |
| GTIN/EAN | 5906301810698 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 45 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 178.92 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 48.55 kg / 476.32 N |
| Magnetic Induction ~ ? | 343.84 mT / 3438 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 simulation of the product - report
These data constitute the direct effect of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these calculations as a reference point during assembly planning.
Table 1: Static force (force vs gap) - characteristics
MW 45x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3438 Gs
343.8 mT
|
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
|
dangerous! |
| 1 mm |
3318 Gs
331.8 mT
|
45.21 kg / 99.68 pounds
45214.3 g / 443.6 N
|
dangerous! |
| 2 mm |
3189 Gs
318.9 mT
|
41.76 kg / 92.07 pounds
41762.8 g / 409.7 N
|
dangerous! |
| 3 mm |
3054 Gs
305.4 mT
|
38.30 kg / 84.44 pounds
38303.2 g / 375.8 N
|
dangerous! |
| 5 mm |
2774 Gs
277.4 mT
|
31.61 kg / 69.69 pounds
31610.0 g / 310.1 N
|
dangerous! |
| 10 mm |
2090 Gs
209.0 mT
|
17.95 kg / 39.57 pounds
17948.5 g / 176.1 N
|
dangerous! |
| 15 mm |
1521 Gs
152.1 mT
|
9.50 kg / 20.95 pounds
9500.8 g / 93.2 N
|
warning |
| 20 mm |
1096 Gs
109.6 mT
|
4.94 kg / 10.88 pounds
4936.3 g / 48.4 N
|
warning |
| 30 mm |
585 Gs
58.5 mT
|
1.41 kg / 3.10 pounds
1407.9 g / 13.8 N
|
weak grip |
| 50 mm |
205 Gs
20.5 mT
|
0.17 kg / 0.38 pounds
172.6 g / 1.7 N
|
weak grip |
Table 2: Slippage load (wall)
MW 45x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
9.71 kg / 21.41 pounds
9710.0 g / 95.3 N
|
| 1 mm | Stal (~0.2) |
9.04 kg / 19.93 pounds
9042.0 g / 88.7 N
|
| 2 mm | Stal (~0.2) |
8.35 kg / 18.41 pounds
8352.0 g / 81.9 N
|
| 3 mm | Stal (~0.2) |
7.66 kg / 16.89 pounds
7660.0 g / 75.1 N
|
| 5 mm | Stal (~0.2) |
6.32 kg / 13.94 pounds
6322.0 g / 62.0 N
|
| 10 mm | Stal (~0.2) |
3.59 kg / 7.91 pounds
3590.0 g / 35.2 N
|
| 15 mm | Stal (~0.2) |
1.90 kg / 4.19 pounds
1900.0 g / 18.6 N
|
| 20 mm | Stal (~0.2) |
0.99 kg / 2.18 pounds
988.0 g / 9.7 N
|
| 30 mm | Stal (~0.2) |
0.28 kg / 0.62 pounds
282.0 g / 2.8 N
|
| 50 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
34.0 g / 0.3 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 45x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
14.56 kg / 32.11 pounds
14565.0 g / 142.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
9.71 kg / 21.41 pounds
9710.0 g / 95.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.86 kg / 10.70 pounds
4855.0 g / 47.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
24.28 kg / 53.52 pounds
24275.0 g / 238.1 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 45x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.43 kg / 5.35 pounds
2427.5 g / 23.8 N
|
| 1 mm |
|
6.07 kg / 13.38 pounds
6068.8 g / 59.5 N
|
| 2 mm |
|
12.14 kg / 26.76 pounds
12137.5 g / 119.1 N
|
| 3 mm |
|
18.21 kg / 40.14 pounds
18206.2 g / 178.6 N
|
| 5 mm |
|
30.34 kg / 66.90 pounds
30343.8 g / 297.7 N
|
| 10 mm |
|
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
|
| 11 mm |
|
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
|
| 12 mm |
|
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MW 45x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
|
OK |
| 40 °C | -2.2% |
47.48 kg / 104.68 pounds
47481.9 g / 465.8 N
|
OK |
| 60 °C | -4.4% |
46.41 kg / 102.32 pounds
46413.8 g / 455.3 N
|
|
| 80 °C | -6.6% |
45.35 kg / 99.97 pounds
45345.7 g / 444.8 N
|
|
| 100 °C | -28.8% |
34.57 kg / 76.21 pounds
34567.6 g / 339.1 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 45x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
115.89 kg / 255.50 pounds
4 958 Gs
|
17.38 kg / 38.32 pounds
17384 g / 170.5 N
|
N/A |
| 1 mm |
111.99 kg / 246.89 pounds
6 759 Gs
|
16.80 kg / 37.03 pounds
16798 g / 164.8 N
|
100.79 kg / 222.20 pounds
~0 Gs
|
| 2 mm |
107.93 kg / 237.94 pounds
6 636 Gs
|
16.19 kg / 35.69 pounds
16189 g / 158.8 N
|
97.14 kg / 214.15 pounds
~0 Gs
|
| 3 mm |
103.82 kg / 228.89 pounds
6 508 Gs
|
15.57 kg / 34.33 pounds
15573 g / 152.8 N
|
93.44 kg / 206.00 pounds
~0 Gs
|
| 5 mm |
95.55 kg / 210.66 pounds
6 244 Gs
|
14.33 kg / 31.60 pounds
14333 g / 140.6 N
|
86.00 kg / 189.59 pounds
~0 Gs
|
| 10 mm |
75.46 kg / 166.35 pounds
5 548 Gs
|
11.32 kg / 24.95 pounds
11318 g / 111.0 N
|
67.91 kg / 149.72 pounds
~0 Gs
|
| 20 mm |
42.84 kg / 94.46 pounds
4 181 Gs
|
6.43 kg / 14.17 pounds
6427 g / 63.0 N
|
38.56 kg / 85.01 pounds
~0 Gs
|
| 50 mm |
6.20 kg / 13.67 pounds
1 591 Gs
|
0.93 kg / 2.05 pounds
930 g / 9.1 N
|
5.58 kg / 12.31 pounds
~0 Gs
|
| 60 mm |
3.36 kg / 7.41 pounds
1 171 Gs
|
0.50 kg / 1.11 pounds
504 g / 4.9 N
|
3.02 kg / 6.67 pounds
~0 Gs
|
| 70 mm |
1.89 kg / 4.16 pounds
877 Gs
|
0.28 kg / 0.62 pounds
283 g / 2.8 N
|
1.70 kg / 3.74 pounds
~0 Gs
|
| 80 mm |
1.10 kg / 2.42 pounds
669 Gs
|
0.16 kg / 0.36 pounds
165 g / 1.6 N
|
0.99 kg / 2.18 pounds
~0 Gs
|
| 90 mm |
0.66 kg / 1.46 pounds
520 Gs
|
0.10 kg / 0.22 pounds
99 g / 1.0 N
|
0.60 kg / 1.31 pounds
~0 Gs
|
| 100 mm |
0.41 kg / 0.91 pounds
410 Gs
|
0.06 kg / 0.14 pounds
62 g / 0.6 N
|
0.37 kg / 0.82 pounds
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MW 45x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 20.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 16.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 12.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 10.0 cm |
| Remote | 50 Gs (5.0 mT) | 9.0 cm |
| Payment card | 400 Gs (40.0 mT) | 4.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Collisions (cracking risk) - collision effects
MW 45x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.09 km/h
(5.58 m/s)
|
2.79 J | |
| 30 mm |
29.29 km/h
(8.14 m/s)
|
5.92 J | |
| 50 mm |
37.23 km/h
(10.34 m/s)
|
9.57 J | |
| 100 mm |
52.54 km/h
(14.59 m/s)
|
19.05 J |
Table 9: Corrosion resistance
MW 45x15 / 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 45x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 57 854 Mx | 578.5 µWb |
| Pc Coefficient | 0.44 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 45x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 48.55 kg | Standard |
| Water (riverbed) |
55.59 kg
(+7.04 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Caution: On a vertical wall, the magnet retains merely a fraction of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Power loss vs temp
*For N38 grade, the critical limit 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.
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% |
Ecology and recycling (GPSR)
| 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 neodymium magnets.
Strengths
- Their magnetic field is maintained, and after approximately ten years it drops only by ~1% (theoretically),
- Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by external magnetic fields,
- A magnet with a metallic nickel surface looks better,
- The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to versatility in designing and the capacity to customize to individual projects,
- Significant place in innovative solutions – they are utilized in mass storage devices, drive modules, advanced medical instruments, and complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions
Limitations
- 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 power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices can complicate diagnosis medical after entering the body.
- With mass production the cost of neodymium magnets is economically unviable,
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
- whose transverse dimension reaches at least 10 mm
- with a surface cleaned and smooth
- without the slightest clearance between the magnet and steel
- under perpendicular application of breakaway force (90-degree angle)
- at ambient temperature room level
Lifting capacity in practice – influencing factors
- Distance (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
- Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
- Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity was assessed with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Safety rules for work with neodymium magnets
Dust explosion hazard
Dust created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Demagnetization risk
Keep cool. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).
Powerful field
Handle magnets consciously. Their huge power can surprise even professionals. Plan your moves and respect their power.
Impact on smartphones
GPS units and smartphones are extremely susceptible to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.
Serious injuries
Big blocks can break fingers instantly. Never put your hand between two attracting surfaces.
Protective goggles
Beware of splinters. Magnets can explode upon uncontrolled impact, launching shards into the air. We recommend safety glasses.
Avoid contact if allergic
Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, cease handling magnets and wear gloves.
Safe distance
Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Warning for heart patients
For implant holders: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.
Choking Hazard
Adult use only. Small elements pose a choking risk, causing serious injuries. Store out of reach of kids and pets.
