MW 38x12 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010060
GTIN/EAN: 5906301810599
Diameter Ø
38 mm [±0,1 mm]
Height
12 mm [±0,1 mm]
Weight
102.07 g
Magnetization Direction
↑ axial
Load capacity
32.79 kg / 321.71 N
Magnetic Induction
331.00 mT / 3310 Gs
Coating
[NiCuNi] Nickel
32.10 ZŁ with VAT / pcs + price for transport
26.10 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical of the product - MW 38x12 / N38 - cylindrical magnet
Specification / characteristics - MW 38x12 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010060 |
| GTIN/EAN | 5906301810599 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 38 mm [±0,1 mm] |
| Height | 12 mm [±0,1 mm] |
| Weight | 102.07 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 32.79 kg / 321.71 N |
| Magnetic Induction ~ ? | 331.00 mT / 3310 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 simulation of the product - technical parameters
Presented data are the result of a engineering calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Use these data as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - power drop
MW 38x12 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3309 Gs
330.9 mT
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
crushing |
| 1 mm |
3175 Gs
317.5 mT
|
30.18 kg / 66.54 lbs
30182.9 g / 296.1 N
|
crushing |
| 2 mm |
3029 Gs
302.9 mT
|
27.46 kg / 60.55 lbs
27464.0 g / 269.4 N
|
crushing |
| 3 mm |
2875 Gs
287.5 mT
|
24.74 kg / 54.55 lbs
24742.8 g / 242.7 N
|
crushing |
| 5 mm |
2556 Gs
255.6 mT
|
19.56 kg / 43.13 lbs
19563.2 g / 191.9 N
|
crushing |
| 10 mm |
1805 Gs
180.5 mT
|
9.75 kg / 21.50 lbs
9750.4 g / 95.7 N
|
medium risk |
| 15 mm |
1229 Gs
122.9 mT
|
4.52 kg / 9.96 lbs
4519.1 g / 44.3 N
|
medium risk |
| 20 mm |
836 Gs
83.6 mT
|
2.09 kg / 4.61 lbs
2092.9 g / 20.5 N
|
medium risk |
| 30 mm |
411 Gs
41.1 mT
|
0.51 kg / 1.11 lbs
505.7 g / 5.0 N
|
weak grip |
| 50 mm |
132 Gs
13.2 mT
|
0.05 kg / 0.12 lbs
52.4 g / 0.5 N
|
weak grip |
Table 2: Sliding load (wall)
MW 38x12 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
6.56 kg / 14.46 lbs
6558.0 g / 64.3 N
|
| 1 mm | Stal (~0.2) |
6.04 kg / 13.31 lbs
6036.0 g / 59.2 N
|
| 2 mm | Stal (~0.2) |
5.49 kg / 12.11 lbs
5492.0 g / 53.9 N
|
| 3 mm | Stal (~0.2) |
4.95 kg / 10.91 lbs
4948.0 g / 48.5 N
|
| 5 mm | Stal (~0.2) |
3.91 kg / 8.62 lbs
3912.0 g / 38.4 N
|
| 10 mm | Stal (~0.2) |
1.95 kg / 4.30 lbs
1950.0 g / 19.1 N
|
| 15 mm | Stal (~0.2) |
0.90 kg / 1.99 lbs
904.0 g / 8.9 N
|
| 20 mm | Stal (~0.2) |
0.42 kg / 0.92 lbs
418.0 g / 4.1 N
|
| 30 mm | Stal (~0.2) |
0.10 kg / 0.22 lbs
102.0 g / 1.0 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 g / 0.1 N
|
Table 3: Wall mounting (sliding) - vertical pull
MW 38x12 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
9.84 kg / 21.69 lbs
9837.0 g / 96.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
6.56 kg / 14.46 lbs
6558.0 g / 64.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.28 kg / 7.23 lbs
3279.0 g / 32.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
16.40 kg / 36.14 lbs
16395.0 g / 160.8 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 38x12 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.64 kg / 3.61 lbs
1639.5 g / 16.1 N
|
| 1 mm |
|
4.10 kg / 9.04 lbs
4098.8 g / 40.2 N
|
| 2 mm |
|
8.20 kg / 18.07 lbs
8197.5 g / 80.4 N
|
| 3 mm |
|
12.30 kg / 27.11 lbs
12296.3 g / 120.6 N
|
| 5 mm |
|
20.49 kg / 45.18 lbs
20493.8 g / 201.0 N
|
| 10 mm |
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
| 11 mm |
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
| 12 mm |
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
Table 5: Thermal resistance (stability) - thermal limit
MW 38x12 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
OK |
| 40 °C | -2.2% |
32.07 kg / 70.70 lbs
32068.6 g / 314.6 N
|
OK |
| 60 °C | -4.4% |
31.35 kg / 69.11 lbs
31347.2 g / 307.5 N
|
|
| 80 °C | -6.6% |
30.63 kg / 67.52 lbs
30625.9 g / 300.4 N
|
|
| 100 °C | -28.8% |
23.35 kg / 51.47 lbs
23346.5 g / 229.0 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 38x12 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
76.58 kg / 168.83 lbs
4 859 Gs
|
11.49 kg / 25.32 lbs
11487 g / 112.7 N
|
N/A |
| 1 mm |
73.60 kg / 162.27 lbs
6 489 Gs
|
11.04 kg / 24.34 lbs
11040 g / 108.3 N
|
66.24 kg / 146.04 lbs
~0 Gs
|
| 2 mm |
70.49 kg / 155.40 lbs
6 350 Gs
|
10.57 kg / 23.31 lbs
10573 g / 103.7 N
|
63.44 kg / 139.86 lbs
~0 Gs
|
| 3 mm |
67.33 kg / 148.43 lbs
6 206 Gs
|
10.10 kg / 22.26 lbs
10099 g / 99.1 N
|
60.59 kg / 133.59 lbs
~0 Gs
|
| 5 mm |
60.95 kg / 134.38 lbs
5 905 Gs
|
9.14 kg / 20.16 lbs
9143 g / 89.7 N
|
54.86 kg / 120.94 lbs
~0 Gs
|
| 10 mm |
45.69 kg / 100.73 lbs
5 113 Gs
|
6.85 kg / 15.11 lbs
6853 g / 67.2 N
|
41.12 kg / 90.65 lbs
~0 Gs
|
| 20 mm |
22.77 kg / 50.20 lbs
3 609 Gs
|
3.42 kg / 7.53 lbs
3416 g / 33.5 N
|
20.49 kg / 45.18 lbs
~0 Gs
|
| 50 mm |
2.34 kg / 5.17 lbs
1 158 Gs
|
0.35 kg / 0.78 lbs
352 g / 3.5 N
|
2.11 kg / 4.65 lbs
~0 Gs
|
| 60 mm |
1.18 kg / 2.60 lbs
822 Gs
|
0.18 kg / 0.39 lbs
177 g / 1.7 N
|
1.06 kg / 2.34 lbs
~0 Gs
|
| 70 mm |
0.63 kg / 1.38 lbs
598 Gs
|
0.09 kg / 0.21 lbs
94 g / 0.9 N
|
0.56 kg / 1.24 lbs
~0 Gs
|
| 80 mm |
0.35 kg / 0.77 lbs
446 Gs
|
0.05 kg / 0.12 lbs
52 g / 0.5 N
|
0.31 kg / 0.69 lbs
~0 Gs
|
| 90 mm |
0.20 kg / 0.45 lbs
340 Gs
|
0.03 kg / 0.07 lbs
30 g / 0.3 N
|
0.18 kg / 0.40 lbs
~0 Gs
|
| 100 mm |
0.12 kg / 0.27 lbs
264 Gs
|
0.02 kg / 0.04 lbs
18 g / 0.2 N
|
0.11 kg / 0.24 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MW 38x12 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 17.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 13.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 10.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 8.0 cm |
| Car key | 50 Gs (5.0 mT) | 7.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Collisions (cracking risk) - collision effects
MW 38x12 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.17 km/h
(5.88 m/s)
|
1.76 J | |
| 30 mm |
31.61 km/h
(8.78 m/s)
|
3.93 J | |
| 50 mm |
40.46 km/h
(11.24 m/s)
|
6.45 J | |
| 100 mm |
57.16 km/h
(15.88 m/s)
|
12.87 J |
Table 9: Anti-corrosion coating durability
MW 38x12 / 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 38x12 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 40 045 Mx | 400.5 µWb |
| Pc Coefficient | 0.42 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 38x12 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 32.79 kg | Standard |
| Water (riverbed) |
37.54 kg
(+4.75 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Power loss vs temp
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42
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.
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 |
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Pros and cons of rare earth magnets.
Benefits
- They retain attractive force for almost ten years – the drop is just ~1% (based on simulations),
- They are extremely resistant to demagnetization induced by presence of other magnetic fields,
- By using a decorative layer of nickel, the element acquires an nice look,
- They are known for high magnetic induction at the operating surface, which increases their power,
- 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 freedom in shaping and the ability to customize to complex applications,
- Wide application in modern industrial fields – they serve a role in HDD drives, electromotive mechanisms, precision medical tools, also multitasking production systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- At very strong impacts they can break, therefore we recommend placing them in steel cases. 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 strength. 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- Due to limitations in realizing threads and complicated forms in magnets, we propose using casing - magnetic holder.
- Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these magnets can complicate diagnosis medical in case of swallowing.
- With budget limitations the cost of neodymium magnets can be a barrier,
Pull force analysis
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
- whose thickness reaches at least 10 mm
- characterized by lack of roughness
- with direct contact (without coatings)
- under vertical application of breakaway force (90-degree angle)
- at temperature approx. 20 degrees Celsius
Practical aspects of lifting capacity – factors
- Clearance – existence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Angle of force application – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Metal type – different alloys reacts the same. Alloy additives weaken the attraction effect.
- Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
- Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.
Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.
Precautions when working with neodymium magnets
Conscious usage
Exercise caution. Rare earth magnets attract from a distance and snap with huge force, often faster than you can move away.
ICD Warning
Patients with a pacemaker should keep an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.
Keep away from computers
Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.
Eye protection
Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.
Precision electronics
Remember: neodymium magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and navigation systems.
Avoid contact if allergic
Some people experience a sensitization to Ni, which is the common plating for NdFeB magnets. Prolonged contact may cause dermatitis. We strongly advise wear safety gloves.
Demagnetization risk
Do not overheat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).
No play value
Absolutely keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are very dangerous.
Pinching danger
Danger of trauma: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Mechanical processing
Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.
