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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Detailed 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 modeling of the magnet - report
These information are the result of a mathematical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (pull vs distance) - interaction chart
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
|
medium risk |
| 30 mm |
899 Gs
89.9 mT
|
2.05 kg / 4.52 pounds
2051.1 g / 20.1 N
|
medium risk |
| 50 mm |
340 Gs
34.0 mT
|
0.29 kg / 0.65 pounds
292.8 g / 2.9 N
|
safe |
Table 2: Slippage capacity (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: Vertical assembly (sliding) - 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: Steel thickness (substrate influence) - 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 resistance (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: Magnet-Magnet interaction (repulsion) - field collision
MW 45x35 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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: Protective zones (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 |
| Timepiece | 20 Gs (2.0 mT) | 16.0 cm |
| Mobile device | 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: Dynamics (cracking risk) - 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: Corrosion resistance
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 (Flux)
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. Vertical hold
*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Temperature resistance
*For N38 material, the max working temp 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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of rare earth magnets.
Advantages
- They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
- They feature excellent resistance to weakening of magnetic properties due to external magnetic sources,
- By using a decorative layer of silver, the element presents an professional look,
- The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
- 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...
- Possibility of detailed machining and adjusting to concrete conditions,
- Huge importance in advanced technology sectors – they are commonly used in HDD drives, motor assemblies, precision medical tools, also technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Cons
- At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complex forms in magnets, we recommend using a housing - magnetic mechanism.
- Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- on a block made of structural steel, perfectly concentrating the magnetic flux
- with a thickness minimum 10 mm
- with a surface free of scratches
- without the slightest air gap between the magnet and steel
- under perpendicular force vector (90-degree angle)
- in stable room temperature
Magnet lifting force in use – key factors
- Air gap (betwixt the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Plate thickness – insufficiently thick steel does not close the flux, causing part of the flux to be lost into the air.
- Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
- Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
- Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.
Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.
Warnings
Fire warning
Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.
Crushing risk
Big blocks can smash fingers instantly. Never put your hand betwixt two strong magnets.
Respect the power
Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
Protective goggles
Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them cracking into shards.
Nickel allergy
Certain individuals suffer from a contact allergy to nickel, which is the common plating for neodymium magnets. Frequent touching can result in a rash. We strongly advise use safety gloves.
Electronic hazard
Do not bring magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Maximum temperature
Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.
Compass and GPS
GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Product not for children
NdFeB magnets are not toys. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.
Implant safety
Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.
