MW 45x35 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010074
GTIN: 5906301810735
Diameter Ø
45 mm [±0,1 mm]
Height
35 mm [±0,1 mm]
Weight
417.49 g
Magnetization Direction
↑ axial
Load capacity
90.84 kg / 891.17 N
Magnetic Induction
521.39 mT
Coating
[NiCuNi] Nickel
180.10 ZŁ with VAT / pcs + price for transport
146.42 ZŁ net + 23% VAT / pcs
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MW 45x35 / N38 - cylindrical magnet
Specification / characteristics MW 45x35 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010074 |
| GTIN | 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 ~ ? | 90.84 kg / 891.17 N |
| Magnetic Induction ~ ? | 521.39 mT |
| 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 | T |
| 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 106 | °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 product - report
These data are the result of a engineering simulation. Values are based on models for the NdFeB material. Real-world conditions may differ. Please consider these calculations as a reference point for designers.
MW 45x35 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
5213 Gs
521.3 mT
|
90.84 kg / 90840.0 g
891.1 N
|
dangerous! |
| 1 mm |
4982 Gs
498.2 mT
|
82.98 kg / 82978.3 g
814.0 N
|
dangerous! |
| 2 mm |
4748 Gs
474.8 mT
|
75.37 kg / 75372.1 g
739.4 N
|
dangerous! |
| 5 mm |
4059 Gs
405.9 mT
|
55.07 kg / 55068.0 g
540.2 N
|
dangerous! |
| 10 mm |
3027 Gs
302.7 mT
|
30.64 kg / 30636.6 g
300.5 N
|
dangerous! |
| 15 mm |
2215 Gs
221.5 mT
|
16.40 kg / 16396.9 g
160.9 N
|
dangerous! |
| 20 mm |
1619 Gs
161.9 mT
|
8.77 kg / 8765.5 g
86.0 N
|
strong |
| 30 mm |
899 Gs
89.9 mT
|
2.70 kg / 2701.1 g
26.5 N
|
strong |
| 50 mm |
340 Gs
34.0 mT
|
0.39 kg / 385.6 g
3.8 N
|
low risk |
MW 45x35 / N38
| Surface Type | Friction Coefficient / % Mocy | Max Load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
27.25 kg / 27252.0 g
267.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
18.17 kg / 18168.0 g
178.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.08 kg / 9084.0 g
89.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
45.42 kg / 45420.0 g
445.6 N
|
MW 45x35 / N38
| Steel Thickness (mm) | % Power | Real Pull (kg) |
|---|---|---|
| 0.5 mm |
|
3.03 kg / 3028.0 g
29.7 N
|
| 1 mm |
|
7.57 kg / 7570.0 g
74.3 N
|
| 2 mm |
|
15.14 kg / 15140.0 g
148.5 N
|
| 5 mm |
|
37.85 kg / 37850.0 g
371.3 N
|
| 10 mm |
|
75.70 kg / 75700.0 g
742.6 N
|
MW 45x35 / N38
| Ambient Temp. (°C) | Power Loss | Remaining Pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
90.84 kg / 90840.0 g
891.1 N
|
OK |
| 40 °C | -2.2% |
88.84 kg / 88841.5 g
871.5 N
|
OK |
| 60 °C | -4.4% |
86.84 kg / 86843.0 g
851.9 N
|
OK |
| 80 °C | -6.6% |
84.84 kg / 84844.6 g
832.3 N
|
|
| 100 °C | -28.8% |
64.68 kg / 64678.1 g
634.5 N
|
MW 45x35 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
136.26 kg / 136260.0 g
1336.7 N
|
N/A |
| 2 mm |
113.06 kg / 113055.0 g
1109.1 N
|
105.52 kg / 105518.0 g
1035.1 N
|
| 5 mm |
82.61 kg / 82605.0 g
810.4 N
|
77.10 kg / 77098.0 g
756.3 N
|
| 10 mm |
45.96 kg / 45960.0 g
450.9 N
|
42.90 kg / 42896.0 g
420.8 N
|
| 20 mm |
13.16 kg / 13155.0 g
129.1 N
|
12.28 kg / 12278.0 g
120.4 N
|
| 50 mm |
0.59 kg / 585.0 g
5.7 N
|
0.55 kg / 546.0 g
5.4 N
|
MW 45x35 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 26.5 cm |
| Hearing aid / Implant | 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 |
MW 45x35 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.74 km/h
(4.93 m/s)
|
5.07 J | |
| 30 mm |
26.24 km/h
(7.29 m/s)
|
11.09 J | |
| 50 mm |
33.35 km/h
(9.26 m/s)
|
17.92 J | |
| 100 mm |
47.05 km/h
(13.07 m/s)
|
35.65 J |
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) |
MW 45x35 / N38
| Environment | Effective Steel Pull | Effect |
|---|---|---|
| Air (Land) | 90.84 kg | Standard |
| Water (Riverbed) |
104.01 kg
(+13.17 kg Buoyancy gain)
|
+14.5% |
Other products
Pros as well as cons of rare earth magnets.
Besides their tremendous strength, neodymium magnets offer the following advantages:
- They retain full power for around ten years – the drop is just ~1% (in theory),
- They are noted for resistance to demagnetization induced by external disturbances,
- In other words, due to the aesthetic surface of nickel, the element is aesthetically pleasing,
- Magnetic induction on the top side of the magnet turns out to be very high,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of custom creating as well as modifying to defined needs,
- Wide application in electronics industry – they serve a role in computer drives, motor assemblies, precision medical tools, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems
Disadvantages of neodymium magnets:
- At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's 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
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in producing nuts and complex forms in magnets, we propose using cover - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these devices can be problematic in diagnostics medical after entering the body.
- With large orders the cost of neodymium magnets is a challenge,
Maximum holding power of the magnet – what affects it?
Information about lifting capacity was defined for the most favorable conditions, including:
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a thickness of at least 10 mm to avoid saturation
- characterized by even structure
- under conditions of ideal adhesion (metal-to-metal)
- during pulling in a direction vertical to the mounting surface
- at temperature approx. 20 degrees Celsius
Magnet lifting force in use – key factors
During everyday use, the actual lifting capacity results from several key aspects, presented from crucial:
- Distance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Base massiveness – too thin steel causes magnetic saturation, causing part of the power to be lost to the other side.
- Metal type – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
- Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
- Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.
* Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.
Safety rules for work with neodymium magnets
Demagnetization risk
Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.
Threat to navigation
Remember: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.
Crushing risk
Pinching hazard: The attraction force is so great that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
Threat to electronics
Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Allergy Warning
Some people have a contact allergy to Ni, which is the common plating for neodymium magnets. Prolonged contact might lead to a rash. It is best to use protective gloves.
Fragile material
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Do not give to children
Strictly keep magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are life-threatening.
Fire risk
Powder created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Handling rules
Be careful. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can react.
ICD Warning
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.
Warning!
Need more info? Check our post: Are neodymium magnets dangerous?
