MW 45x35 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010074
GTIN/EAN: 5906301810735
Diameter Ø
45 mm [±0,1 mm]
Height
35 mm [±0,1 mm]
Weight
417.49 g
Magnetization Direction
↑ axial
Load capacity
68.98 kg / 676.73 N
Magnetic Induction
521.39 mT / 5214 Gs
Coating
[NiCuNi] Nickel
180.10 ZŁ with VAT / pcs + price for transport
146.42 ZŁ net + 23% VAT / pcs
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Product card - MW 45x35 / N38 - cylindrical magnet
Specification / characteristics - MW 45x35 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010074 |
| GTIN/EAN | 5906301810735 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 45 mm [±0,1 mm] |
| Height | 35 mm [±0,1 mm] |
| Weight | 417.49 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 68.98 kg / 676.73 N |
| Magnetic Induction ~ ? | 521.39 mT / 5214 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 modeling of the magnet - data
The following information represent the result of a mathematical calculation. Results are based on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these data as a reference point for designers.
Table 1: Static pull force (force vs gap) - power drop
MW 45x35 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5213 Gs
521.3 mT
|
68.98 kg / 152.07 pounds
68980.0 g / 676.7 N
|
critical level |
| 1 mm |
4982 Gs
498.2 mT
|
63.01 kg / 138.91 pounds
63010.2 g / 618.1 N
|
critical level |
| 2 mm |
4748 Gs
474.8 mT
|
57.23 kg / 126.18 pounds
57234.3 g / 561.5 N
|
critical level |
| 3 mm |
4516 Gs
451.6 mT
|
51.76 kg / 114.10 pounds
51756.9 g / 507.7 N
|
critical level |
| 5 mm |
4059 Gs
405.9 mT
|
41.82 kg / 92.19 pounds
41816.3 g / 410.2 N
|
critical level |
| 10 mm |
3027 Gs
302.7 mT
|
23.26 kg / 51.29 pounds
23264.1 g / 228.2 N
|
critical level |
| 15 mm |
2215 Gs
221.5 mT
|
12.45 kg / 27.45 pounds
12451.1 g / 122.1 N
|
critical level |
| 20 mm |
1619 Gs
161.9 mT
|
6.66 kg / 14.67 pounds
6656.2 g / 65.3 N
|
warning |
| 30 mm |
899 Gs
89.9 mT
|
2.05 kg / 4.52 pounds
2051.1 g / 20.1 N
|
warning |
| 50 mm |
340 Gs
34.0 mT
|
0.29 kg / 0.65 pounds
292.8 g / 2.9 N
|
weak grip |
Table 2: Sliding hold (vertical surface)
MW 45x35 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
13.80 kg / 30.41 pounds
13796.0 g / 135.3 N
|
| 1 mm | Stal (~0.2) |
12.60 kg / 27.78 pounds
12602.0 g / 123.6 N
|
| 2 mm | Stal (~0.2) |
11.45 kg / 25.23 pounds
11446.0 g / 112.3 N
|
| 3 mm | Stal (~0.2) |
10.35 kg / 22.82 pounds
10352.0 g / 101.6 N
|
| 5 mm | Stal (~0.2) |
8.36 kg / 18.44 pounds
8364.0 g / 82.1 N
|
| 10 mm | Stal (~0.2) |
4.65 kg / 10.26 pounds
4652.0 g / 45.6 N
|
| 15 mm | Stal (~0.2) |
2.49 kg / 5.49 pounds
2490.0 g / 24.4 N
|
| 20 mm | Stal (~0.2) |
1.33 kg / 2.94 pounds
1332.0 g / 13.1 N
|
| 30 mm | Stal (~0.2) |
0.41 kg / 0.90 pounds
410.0 g / 4.0 N
|
| 50 mm | Stal (~0.2) |
0.06 kg / 0.13 pounds
58.0 g / 0.6 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 45x35 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
20.69 kg / 45.62 pounds
20694.0 g / 203.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
13.80 kg / 30.41 pounds
13796.0 g / 135.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
6.90 kg / 15.21 pounds
6898.0 g / 67.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
34.49 kg / 76.04 pounds
34490.0 g / 338.3 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 45x35 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.30 kg / 5.07 pounds
2299.3 g / 22.6 N
|
| 1 mm |
|
5.75 kg / 12.67 pounds
5748.3 g / 56.4 N
|
| 2 mm |
|
11.50 kg / 25.35 pounds
11496.7 g / 112.8 N
|
| 3 mm |
|
17.25 kg / 38.02 pounds
17245.0 g / 169.2 N
|
| 5 mm |
|
28.74 kg / 63.36 pounds
28741.7 g / 282.0 N
|
| 10 mm |
|
57.48 kg / 126.73 pounds
57483.3 g / 563.9 N
|
| 11 mm |
|
63.23 kg / 139.40 pounds
63231.7 g / 620.3 N
|
| 12 mm |
|
68.98 kg / 152.07 pounds
68980.0 g / 676.7 N
|
Table 5: Working in heat (stability) - thermal limit
MW 45x35 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
68.98 kg / 152.07 pounds
68980.0 g / 676.7 N
|
OK |
| 40 °C | -2.2% |
67.46 kg / 148.73 pounds
67462.4 g / 661.8 N
|
OK |
| 60 °C | -4.4% |
65.94 kg / 145.38 pounds
65944.9 g / 646.9 N
|
OK |
| 80 °C | -6.6% |
64.43 kg / 142.04 pounds
64427.3 g / 632.0 N
|
|
| 100 °C | -28.8% |
49.11 kg / 108.28 pounds
49113.8 g / 481.8 N
|
Table 6: Two magnets (attraction) - field collision
MW 45x35 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
266.45 kg / 587.43 pounds
5 900 Gs
|
39.97 kg / 88.11 pounds
39968 g / 392.1 N
|
N/A |
| 1 mm |
254.93 kg / 562.03 pounds
10 198 Gs
|
38.24 kg / 84.30 pounds
38240 g / 375.1 N
|
229.44 kg / 505.82 pounds
~0 Gs
|
| 2 mm |
243.39 kg / 536.59 pounds
9 965 Gs
|
36.51 kg / 80.49 pounds
36509 g / 358.2 N
|
219.05 kg / 482.93 pounds
~0 Gs
|
| 3 mm |
232.10 kg / 511.70 pounds
9 731 Gs
|
34.82 kg / 76.76 pounds
34816 g / 341.5 N
|
208.89 kg / 460.53 pounds
~0 Gs
|
| 5 mm |
210.35 kg / 463.75 pounds
9 264 Gs
|
31.55 kg / 69.56 pounds
31553 g / 309.5 N
|
189.32 kg / 417.37 pounds
~0 Gs
|
| 10 mm |
161.53 kg / 356.11 pounds
8 118 Gs
|
24.23 kg / 53.42 pounds
24229 g / 237.7 N
|
145.37 kg / 320.49 pounds
~0 Gs
|
| 20 mm |
89.86 kg / 198.12 pounds
6 055 Gs
|
13.48 kg / 29.72 pounds
13480 g / 132.2 N
|
80.88 kg / 178.30 pounds
~0 Gs
|
| 50 mm |
14.04 kg / 30.96 pounds
2 394 Gs
|
2.11 kg / 4.64 pounds
2107 g / 20.7 N
|
12.64 kg / 27.87 pounds
~0 Gs
|
| 60 mm |
7.92 kg / 17.47 pounds
1 798 Gs
|
1.19 kg / 2.62 pounds
1188 g / 11.7 N
|
7.13 kg / 15.72 pounds
~0 Gs
|
| 70 mm |
4.63 kg / 10.21 pounds
1 375 Gs
|
0.69 kg / 1.53 pounds
695 g / 6.8 N
|
4.17 kg / 9.19 pounds
~0 Gs
|
| 80 mm |
2.80 kg / 6.18 pounds
1 070 Gs
|
0.42 kg / 0.93 pounds
421 g / 4.1 N
|
2.52 kg / 5.56 pounds
~0 Gs
|
| 90 mm |
1.75 kg / 3.87 pounds
846 Gs
|
0.26 kg / 0.58 pounds
263 g / 2.6 N
|
1.58 kg / 3.48 pounds
~0 Gs
|
| 100 mm |
1.13 kg / 2.49 pounds
679 Gs
|
0.17 kg / 0.37 pounds
170 g / 1.7 N
|
1.02 kg / 2.24 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MW 45x35 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 26.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 20.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 16.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 12.5 cm |
| Remote | 50 Gs (5.0 mT) | 11.5 cm |
| Payment card | 400 Gs (40.0 mT) | 5.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 4.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 45x35 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
15.46 km/h
(4.29 m/s)
|
3.85 J | |
| 30 mm |
22.87 km/h
(6.35 m/s)
|
8.42 J | |
| 50 mm |
29.06 km/h
(8.07 m/s)
|
13.61 J | |
| 100 mm |
41.00 km/h
(11.39 m/s)
|
27.07 J |
Table 9: Anti-corrosion coating durability
MW 45x35 / 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 (Pc)
MW 45x35 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 83 921 Mx | 839.2 µWb |
| Pc Coefficient | 0.78 | High (Stable) |
Table 11: Submerged application
MW 45x35 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 68.98 kg | Standard |
| Water (riverbed) |
78.98 kg
(+10.00 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.
3. Heat tolerance
*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) = 0.78
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% |
Environmental data
| 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.
Pros
- They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They are resistant to demagnetization induced by external magnetic fields,
- In other words, due to the smooth surface of gold, the element looks attractive,
- The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
- Possibility of accurate machining and adapting to specific applications,
- Wide application in electronics industry – they are commonly used in computer drives, brushless drives, medical devices, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in miniature devices
Disadvantages
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex forms.
- Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Maximum lifting force for a neodymium magnet – what affects it?
- with the use of a sheet made of special test steel, guaranteeing maximum field concentration
- whose transverse dimension equals approx. 10 mm
- with an ideally smooth touching surface
- with total lack of distance (no coatings)
- during pulling in a direction perpendicular to the plane
- at temperature room level
Determinants of lifting force in real conditions
- Clearance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
- Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.
H&S for magnets
Magnetic media
Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Heat warning
Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.
Handling guide
Handle with care. Rare earth magnets act from a long distance and connect with huge force, often quicker than you can move away.
Fragile material
Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.
Dust is flammable
Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.
Warning for heart patients
Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to handle the magnets.
Choking Hazard
Always store magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.
Threat to navigation
A powerful magnetic field negatively affects the operation of compasses in phones and GPS navigation. Maintain magnets near a smartphone to avoid breaking the sensors.
Skin irritation risks
Certain individuals suffer from a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching might lead to skin redness. We strongly advise wear safety gloves.
Physical harm
Risk of injury: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
