MW 4x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010075
GTIN: 5906301810742
Diameter Ø
4 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
0.94 g
Magnetization Direction
↑ axial
Load capacity
0.98 kg / 9.57 N
Magnetic Induction
606.05 mT
Coating
[NiCuNi] Nickel
0.800 ZŁ with VAT / pcs + price for transport
0.650 ZŁ net + 23% VAT / pcs
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MW 4x10 / N38 - cylindrical magnet
Specification / characteristics MW 4x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010075 |
| GTIN | 5906301810742 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 4 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 0.94 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.98 kg / 9.57 N |
| Magnetic Induction ~ ? | 606.05 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 analysis of the product - parameters
Presented information represent the outcome of a physical simulation. Results rely on algorithms for the NdFeB material. Real-world parameters may deviate from the simulation. Please consider these data as a guide during the design process.
MW 4x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
6049 Gs
604.9 mT
|
0.98 kg / 980.0 g
9.6 N
|
low risk |
| 1 mm |
3327 Gs
332.7 mT
|
0.30 kg / 296.5 g
2.9 N
|
low risk |
| 2 mm |
1732 Gs
173.2 mT
|
0.08 kg / 80.3 g
0.8 N
|
low risk |
| 5 mm |
389 Gs
38.9 mT
|
0.00 kg / 4.1 g
0.0 N
|
low risk |
| 10 mm |
90 Gs
9.0 mT
|
0.00 kg / 0.2 g
0.0 N
|
low risk |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.0 g
0.0 N
|
low risk |
| 20 mm |
17 Gs
1.7 mT
|
0.00 kg / 0.0 g
0.0 N
|
low risk |
| 30 mm |
6 Gs
0.6 mT
|
0.00 kg / 0.0 g
0.0 N
|
low risk |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.0 g
0.0 N
|
low risk |
MW 4x10 / N38
| Surface Type | Friction Coefficient / % Mocy | Max Load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.29 kg / 294.0 g
2.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.20 kg / 196.0 g
1.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.10 kg / 98.0 g
1.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.49 kg / 490.0 g
4.8 N
|
MW 4x10 / N38
| Steel Thickness (mm) | % Power | Real Pull (kg) |
|---|---|---|
| 0.5 mm |
|
0.10 kg / 98.0 g
1.0 N
|
| 1 mm |
|
0.25 kg / 245.0 g
2.4 N
|
| 2 mm |
|
0.49 kg / 490.0 g
4.8 N
|
| 5 mm |
|
0.98 kg / 980.0 g
9.6 N
|
| 10 mm |
|
0.98 kg / 980.0 g
9.6 N
|
MW 4x10 / N38
| Ambient Temp. (°C) | Power Loss | Remaining Pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.98 kg / 980.0 g
9.6 N
|
OK |
| 40 °C | -2.2% |
0.96 kg / 958.4 g
9.4 N
|
OK |
| 60 °C | -4.4% |
0.94 kg / 936.9 g
9.2 N
|
OK |
| 80 °C | -6.6% |
0.92 kg / 915.3 g
9.0 N
|
|
| 100 °C | -28.8% |
0.70 kg / 697.8 g
6.8 N
|
MW 4x10 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
1.47 kg / 1470.0 g
14.4 N
|
N/A |
| 2 mm |
0.12 kg / 120.0 g
1.2 N
|
0.11 kg / 112.0 g
1.1 N
|
| 5 mm |
0.00 kg / 0.0 g
0.0 N
|
0.00 kg / 0.0 g
0.0 N
|
| 10 mm |
0.00 kg / 0.0 g
0.0 N
|
0.00 kg / 0.0 g
0.0 N
|
| 20 mm |
0.00 kg / 0.0 g
0.0 N
|
0.00 kg / 0.0 g
0.0 N
|
| 50 mm |
0.00 kg / 0.0 g
0.0 N
|
0.00 kg / 0.0 g
0.0 N
|
MW 4x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid / Implant | 10 Gs (1.0 mT) | 2.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
MW 4x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
32.57 km/h
(9.05 m/s)
|
0.04 J | |
| 30 mm |
56.40 km/h
(15.67 m/s)
|
0.12 J | |
| 50 mm |
72.81 km/h
(20.23 m/s)
|
0.19 J | |
| 100 mm |
102.97 km/h
(28.60 m/s)
|
0.38 J |
MW 4x10 / 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 4x10 / N38
| Environment | Effective Steel Pull | Effect |
|---|---|---|
| Air (Land) | 0.98 kg | Standard |
| Water (Riverbed) |
1.12 kg
(+0.14 kg Buoyancy gain)
|
+14.5% |
Other deals
Pros as well as cons of NdFeB magnets.
Apart from their strong magnetism, neodymium magnets have these key benefits:
- They have unchanged lifting capacity, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
- Neodymium magnets prove to be remarkably resistant to demagnetization caused by external interference,
- In other words, due to the metallic layer of gold, the element becomes visually attractive,
- Neodymium magnets deliver maximum magnetic induction on a their surface, which allows for strong attraction,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
- Thanks to modularity in shaping and the capacity to customize to individual projects,
- Fundamental importance in electronics industry – they are commonly used in mass storage devices, electromotive mechanisms, medical devices, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions
Disadvantages of NdFeB magnets:
- To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
- Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities
Maximum lifting capacity of the magnet – what it depends on?
The specified lifting capacity concerns the maximum value, recorded under ideal test conditions, namely:
- on a block made of mild steel, optimally conducting the magnetic flux
- whose thickness is min. 10 mm
- with an ideally smooth touching surface
- with direct contact (no paint)
- under vertical force direction (90-degree angle)
- at temperature room level
Practical lifting capacity: influencing factors
During everyday use, the actual lifting capacity results from several key aspects, listed from most significant:
- Space between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped into the air.
- Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
- Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.
H&S for magnets
Warning for allergy sufferers
Studies show that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, avoid direct skin contact and select versions in plastic housing.
Safe operation
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.
Bone fractures
Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Demagnetization risk
Avoid heat. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, look for HT versions (H, SH, UH).
Flammability
Powder created during machining of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Shattering risk
Beware of splinters. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.
Impact on smartphones
Note: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, tablet, and GPS.
Pacemakers
Individuals with a ICD should maintain an large gap from magnets. The magnetism can interfere with the functioning of the implant.
Product not for children
Absolutely keep magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are fatal.
Threat to electronics
Avoid bringing magnets near a purse, computer, or TV. The magnetism can permanently damage these devices and wipe information from cards.
Important!
More info about hazards in the article: Safety of working with magnets.
