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
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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 |
Technical simulation of the magnet - data
Presented information are the direct effect of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ. Please consider these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - 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 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
|
weak grip |
Table 2: Shear load (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 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: 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 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 resistance (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 collision
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 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: Hazards (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: Impact energy (cracking risk) - 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 (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: 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. Shear force
*Note: On a vertical wall, the magnet holds just approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) significantly limits 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) = 0.78
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 products
Pros as well as cons of Nd2Fe14B magnets.
Strengths
- Their strength remains stable, and after around 10 years it drops only by ~1% (theoretically),
- They maintain their magnetic properties even under close interference source,
- A magnet with a metallic silver surface has better aesthetics,
- Neodymium magnets ensure maximum magnetic induction on a small area, which ensures high operational effectiveness,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Considering the potential of flexible molding and customization to specialized needs, neodymium magnets can be modeled in a wide range of geometric configurations, which amplifies use scope,
- Universal use in modern technologies – they find application in magnetic memories, drive modules, advanced medical instruments, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices
Cons
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited possibility of creating threads in the magnet and complicated shapes - recommended is cover - magnetic holder.
- Health risk related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis 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 holding power of the magnet – what contributes to it?
- using a plate made of mild steel, functioning as a magnetic yoke
- with a thickness of at least 10 mm
- characterized by lack of roughness
- without the slightest insulating layer between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at temperature room level
Magnet lifting force in use – key factors
- Clearance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
- Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
- Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.
Warnings
Allergic reactions
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.
Crushing force
Large magnets can break fingers instantly. Do not put your hand between two strong magnets.
Warning for heart patients
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Maximum temperature
Keep cool. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).
Caution required
Handle with care. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.
Fire warning
Combustion risk: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.
Phone sensors
Be aware: neodymium magnets generate a field that interferes with precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.
Electronic devices
Avoid bringing magnets near a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.
This is not a toy
Absolutely store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are very dangerous.
Magnets are brittle
Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them shattering into small pieces.
