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
- Coating
- [NiCuNi] Nickel
50.28 zł net / pcs
61.84 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
Call us now
+48 888 99 98 98
alternatively let us know using
contact form
the contact section.
Specifications and structure of a neodymium magnet can be estimated using our
power calculator.
Order by 14:00 and we’ll ship today!
Technical details - 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 |
Technical simulation of the assembly - data
The following data are the result of a physical calculation. Values rely on models for the material Nd2Fe14B. Actual conditions may differ. Please consider these data as a reference point during assembly planning.
Table 1: Static force (force vs gap) - power drop
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
|
strong |
| 20 mm |
1096 Gs
109.6 mT
|
4.94 kg / 10.88 pounds
4936.3 g / 48.4 N
|
strong |
| 30 mm |
585 Gs
58.5 mT
|
1.41 kg / 3.10 pounds
1407.9 g / 13.8 N
|
safe |
| 50 mm |
205 Gs
20.5 mT
|
0.17 kg / 0.38 pounds
172.6 g / 1.7 N
|
safe |
Table 2: Vertical 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: Material efficiency (substrate influence) - 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: Working in heat (stability) - power drop
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 (attraction) - field collision
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: Safety (HSE) (implants) - warnings
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 12.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 10.0 cm |
| Car key | 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: Dynamics (kinetic energy) - warning
MW 45x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.39 km/h
(5.94 m/s)
|
3.16 J | |
| 30 mm |
25.33 km/h
(7.04 m/s)
|
4.43 J | |
| 50 mm |
25.64 km/h
(7.12 m/s)
|
4.54 J | |
| 100 mm |
25.70 km/h
(7.14 m/s)
|
4.56 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: Electrical 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: Hydrostatics and buoyancy
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. Wall mount (shear)
*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) significantly weakens the holding force.
3. Thermal stability
*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) = 0.44
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View more offers
Advantages and disadvantages of neodymium magnets.
Advantages
- Their power remains stable, and after around 10 years it drops only by ~1% (according to research),
- Magnets perfectly defend themselves against loss of magnetization caused by foreign field sources,
- By covering with a lustrous layer of silver, the element has an proper look,
- Magnets have extremely high magnetic induction on the outer layer,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
- In view of the ability of flexible forming and customization to custom solutions, magnetic components can be produced in a broad palette of shapes and sizes, which expands the range of possible applications,
- Wide application in advanced technology sectors – they are utilized in data components, drive modules, advanced medical instruments, and complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Disadvantages
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
- Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Magnetic strength at its maximum – what affects it?
- on a plate made of structural steel, perfectly concentrating the magnetic field
- possessing a thickness of min. 10 mm to ensure full flux closure
- with an ground contact surface
- with total lack of distance (no impurities)
- for force acting at a right angle (in the magnet axis)
- at temperature room level
Key elements affecting lifting force
- Distance – the presence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
- Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate lowers the holding force.
Warnings
Machining danger
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.
Do not give to children
Neodymium magnets are not toys. Swallowing several magnets may result in them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.
Allergy Warning
Medical facts indicate that nickel (the usual finish) is a strong allergen. For allergy sufferers, avoid direct skin contact or opt for coated magnets.
Pinching danger
Protect your hands. Two large magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Protect data
Avoid bringing magnets close to a wallet, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.
Thermal limits
Do not overheat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).
Handling rules
Be careful. Neodymium magnets act from a distance and snap with huge force, often faster than you can react.
Keep away from electronics
Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.
Protective goggles
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Pacemakers
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
