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
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Technical details - 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 assembly - data
These information are the outcome of a engineering calculation. Values are based on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ. Please consider these data as a preliminary roadmap for designers.
Table 1: Static pull force (pull vs gap) - characteristics
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
|
dangerous! |
| 1 mm |
4982 Gs
498.2 mT
|
63.01 kg / 138.91 pounds
63010.2 g / 618.1 N
|
dangerous! |
| 2 mm |
4748 Gs
474.8 mT
|
57.23 kg / 126.18 pounds
57234.3 g / 561.5 N
|
dangerous! |
| 3 mm |
4516 Gs
451.6 mT
|
51.76 kg / 114.10 pounds
51756.9 g / 507.7 N
|
dangerous! |
| 5 mm |
4059 Gs
405.9 mT
|
41.82 kg / 92.19 pounds
41816.3 g / 410.2 N
|
dangerous! |
| 10 mm |
3027 Gs
302.7 mT
|
23.26 kg / 51.29 pounds
23264.1 g / 228.2 N
|
dangerous! |
| 15 mm |
2215 Gs
221.5 mT
|
12.45 kg / 27.45 pounds
12451.1 g / 122.1 N
|
dangerous! |
| 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
|
low risk |
Table 2: Slippage hold (wall)
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 (sliding) - vertical pull
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 (saturation) - sheet metal selection
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: Thermal stability (material behavior) - resistance threshold
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 (repulsion) - field range
MW 45x35 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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 |
| Phone / Smartphone | 40 Gs (4.0 mT) | 12.5 cm |
| Car key | 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: Collisions (kinetic energy) - warning
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: Underwater work (magnet fishing)
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. Wall mount (shear)
*Note: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.
3. Power loss vs temp
*For N38 material, the safety 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Check out also proposals
Advantages as well as disadvantages of rare earth magnets.
Pros
- Their magnetic field is durable, and after approximately ten years it drops only by ~1% (theoretically),
- Magnets effectively resist against demagnetization caused by ambient magnetic noise,
- Thanks to the reflective finish, the coating of nickel, gold, or silver gives an aesthetic appearance,
- Neodymium magnets generate maximum magnetic induction on a their surface, which increases force concentration,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
- Thanks to versatility in forming and the ability to adapt to unusual requirements,
- Versatile presence in electronics industry – they find application in mass storage devices, electric motors, medical equipment, also multitasking production systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
- Limited ability of creating threads in the magnet and complex forms - recommended is a housing - mounting mechanism.
- Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- Due to complex production process, their price exceeds standard values,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of at least 10 mm to avoid saturation
- characterized by lack of roughness
- with direct contact (no coatings)
- under axial force direction (90-degree angle)
- at standard ambient temperature
Key elements affecting lifting force
- Distance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be wasted to the other side.
- Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
- Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
- Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Precautions when working with NdFeB magnets
Fragile material
Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.
Thermal limits
Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.
Finger safety
Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.
Conscious usage
Exercise caution. Rare earth magnets attract from a distance and connect with huge force, often faster than you can move away.
Do not drill into magnets
Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.
Precision electronics
A powerful magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.
Adults only
Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.
Nickel coating and allergies
It is widely known that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands and opt for coated magnets.
Data carriers
Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of at least 10 cm.
Implant safety
For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.
