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
bulk discounts:
Need more?
Give us a call
+48 888 99 98 98
or contact us via
inquiry form
our website.
Lifting power and form of neodymium magnets can be checked with our
online calculation tool.
Same-day processing for orders placed before 14:00.
Technical specification - 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 |
Engineering analysis of the assembly - report
The following data constitute the outcome of a engineering analysis. Results rely on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these calculations as a reference point during assembly planning.
Table 1: Static force (pull vs distance) - 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 LBS
68980.0 g / 676.7 N
|
critical level |
| 1 mm |
4982 Gs
498.2 mT
|
63.01 kg / 138.91 LBS
63010.2 g / 618.1 N
|
critical level |
| 2 mm |
4748 Gs
474.8 mT
|
57.23 kg / 126.18 LBS
57234.3 g / 561.5 N
|
critical level |
| 3 mm |
4516 Gs
451.6 mT
|
51.76 kg / 114.10 LBS
51756.9 g / 507.7 N
|
critical level |
| 5 mm |
4059 Gs
405.9 mT
|
41.82 kg / 92.19 LBS
41816.3 g / 410.2 N
|
critical level |
| 10 mm |
3027 Gs
302.7 mT
|
23.26 kg / 51.29 LBS
23264.1 g / 228.2 N
|
critical level |
| 15 mm |
2215 Gs
221.5 mT
|
12.45 kg / 27.45 LBS
12451.1 g / 122.1 N
|
critical level |
| 20 mm |
1619 Gs
161.9 mT
|
6.66 kg / 14.67 LBS
6656.2 g / 65.3 N
|
medium risk |
| 30 mm |
899 Gs
89.9 mT
|
2.05 kg / 4.52 LBS
2051.1 g / 20.1 N
|
medium risk |
| 50 mm |
340 Gs
34.0 mT
|
0.29 kg / 0.65 LBS
292.8 g / 2.9 N
|
low risk |
Table 2: Vertical load (wall)
MW 45x35 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
13.80 kg / 30.41 LBS
13796.0 g / 135.3 N
|
| 1 mm | Stal (~0.2) |
12.60 kg / 27.78 LBS
12602.0 g / 123.6 N
|
| 2 mm | Stal (~0.2) |
11.45 kg / 25.23 LBS
11446.0 g / 112.3 N
|
| 3 mm | Stal (~0.2) |
10.35 kg / 22.82 LBS
10352.0 g / 101.6 N
|
| 5 mm | Stal (~0.2) |
8.36 kg / 18.44 LBS
8364.0 g / 82.1 N
|
| 10 mm | Stal (~0.2) |
4.65 kg / 10.26 LBS
4652.0 g / 45.6 N
|
| 15 mm | Stal (~0.2) |
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
|
| 20 mm | Stal (~0.2) |
1.33 kg / 2.94 LBS
1332.0 g / 13.1 N
|
| 30 mm | Stal (~0.2) |
0.41 kg / 0.90 LBS
410.0 g / 4.0 N
|
| 50 mm | Stal (~0.2) |
0.06 kg / 0.13 LBS
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 LBS
20694.0 g / 203.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
13.80 kg / 30.41 LBS
13796.0 g / 135.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
6.90 kg / 15.21 LBS
6898.0 g / 67.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
34.49 kg / 76.04 LBS
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 LBS
2299.3 g / 22.6 N
|
| 1 mm |
|
5.75 kg / 12.67 LBS
5748.3 g / 56.4 N
|
| 2 mm |
|
11.50 kg / 25.35 LBS
11496.7 g / 112.8 N
|
| 3 mm |
|
17.25 kg / 38.02 LBS
17245.0 g / 169.2 N
|
| 5 mm |
|
28.74 kg / 63.36 LBS
28741.7 g / 282.0 N
|
| 10 mm |
|
57.48 kg / 126.73 LBS
57483.3 g / 563.9 N
|
| 11 mm |
|
63.23 kg / 139.40 LBS
63231.7 g / 620.3 N
|
| 12 mm |
|
68.98 kg / 152.07 LBS
68980.0 g / 676.7 N
|
Table 5: Thermal stability (material behavior) - 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 LBS
68980.0 g / 676.7 N
|
OK |
| 40 °C | -2.2% |
67.46 kg / 148.73 LBS
67462.4 g / 661.8 N
|
OK |
| 60 °C | -4.4% |
65.94 kg / 145.38 LBS
65944.9 g / 646.9 N
|
OK |
| 80 °C | -6.6% |
64.43 kg / 142.04 LBS
64427.3 g / 632.0 N
|
|
| 100 °C | -28.8% |
49.11 kg / 108.28 LBS
49113.8 g / 481.8 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MW 45x35 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
266.45 kg / 587.43 LBS
5 900 Gs
|
39.97 kg / 88.11 LBS
39968 g / 392.1 N
|
N/A |
| 1 mm |
254.93 kg / 562.03 LBS
10 198 Gs
|
38.24 kg / 84.30 LBS
38240 g / 375.1 N
|
229.44 kg / 505.82 LBS
~0 Gs
|
| 2 mm |
243.39 kg / 536.59 LBS
9 965 Gs
|
36.51 kg / 80.49 LBS
36509 g / 358.2 N
|
219.05 kg / 482.93 LBS
~0 Gs
|
| 3 mm |
232.10 kg / 511.70 LBS
9 731 Gs
|
34.82 kg / 76.76 LBS
34816 g / 341.5 N
|
208.89 kg / 460.53 LBS
~0 Gs
|
| 5 mm |
210.35 kg / 463.75 LBS
9 264 Gs
|
31.55 kg / 69.56 LBS
31553 g / 309.5 N
|
189.32 kg / 417.37 LBS
~0 Gs
|
| 10 mm |
161.53 kg / 356.11 LBS
8 118 Gs
|
24.23 kg / 53.42 LBS
24229 g / 237.7 N
|
145.37 kg / 320.49 LBS
~0 Gs
|
| 20 mm |
89.86 kg / 198.12 LBS
6 055 Gs
|
13.48 kg / 29.72 LBS
13480 g / 132.2 N
|
80.88 kg / 178.30 LBS
~0 Gs
|
| 50 mm |
14.04 kg / 30.96 LBS
2 394 Gs
|
2.11 kg / 4.64 LBS
2107 g / 20.7 N
|
12.64 kg / 27.87 LBS
~0 Gs
|
| 60 mm |
7.92 kg / 17.47 LBS
1 798 Gs
|
1.19 kg / 2.62 LBS
1188 g / 11.7 N
|
7.13 kg / 15.72 LBS
~0 Gs
|
| 70 mm |
4.63 kg / 10.21 LBS
1 375 Gs
|
0.69 kg / 1.53 LBS
695 g / 6.8 N
|
4.17 kg / 9.19 LBS
~0 Gs
|
| 80 mm |
2.80 kg / 6.18 LBS
1 070 Gs
|
0.42 kg / 0.93 LBS
421 g / 4.1 N
|
2.52 kg / 5.56 LBS
~0 Gs
|
| 90 mm |
1.75 kg / 3.87 LBS
846 Gs
|
0.26 kg / 0.58 LBS
263 g / 2.6 N
|
1.58 kg / 3.48 LBS
~0 Gs
|
| 100 mm |
1.13 kg / 2.49 LBS
679 Gs
|
0.17 kg / 0.37 LBS
170 g / 1.7 N
|
1.02 kg / 2.24 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
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) - 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: Surface protection spec
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: Construction 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: Physics of underwater searching
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
*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Temperature resistance
*For standard magnets, 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
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.
Material specification
| 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 proposals
Advantages and disadvantages of neodymium magnets.
Advantages
- They have unchanged lifting capacity, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
- Magnets perfectly resist against demagnetization caused by foreign field sources,
- A magnet with a smooth nickel surface looks better,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to versatility in constructing and the capacity to modify to unusual requirements,
- Universal use in modern technologies – they are used in HDD drives, electromotive mechanisms, medical devices, also other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems
Limitations
- At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's 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.
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
- Limited ability of creating nuts in the magnet and complicated shapes - preferred is cover - magnetic holder.
- Health risk related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets 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 can limit application in large quantities
Holding force characteristics
Maximum magnetic pulling force – what it depends on?
- using a plate made of high-permeability steel, acting as a ideal flux conductor
- whose transverse dimension reaches at least 10 mm
- with a plane free of scratches
- without any clearance between the magnet and steel
- during detachment in a direction vertical to the plane
- at ambient temperature room level
Lifting capacity in practice – influencing factors
- Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- Angle of force application – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
- Metal 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.
- Plate material – low-carbon steel gives the best results. Alloy steels reduce magnetic properties and lifting capacity.
- Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate reduces the holding force.
Precautions when working with NdFeB magnets
Conscious usage
Handle magnets with awareness. Their huge power can shock even experienced users. Plan your moves and respect their power.
Crushing force
Large magnets can break fingers instantly. Under no circumstances place your hand between two strong magnets.
Protective goggles
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.
GPS Danger
An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets near a device to avoid damaging the sensors.
Avoid contact if allergic
Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for encased magnets.
Warning for heart patients
People with a heart stimulator should keep an large gap from magnets. The magnetic field can disrupt the functioning of the implant.
Electronic devices
Very strong magnetic fields can erase data on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.
Dust is flammable
Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
No play value
Strictly store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.
Operating temperature
Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.
