MW 12x1.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010442
GTIN/EAN: 5906301811114
- Diameter Ø
- 12 mm [±0,1 mm]
- Height
- 1.5 mm [±0,1 mm]
- Weight
- 1.27 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
0.350 zł net / pcs
0.431 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical specification - MW 12x1.5 / N38 - cylindrical magnet
Specification / characteristics - MW 12x1.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010442 |
| GTIN/EAN | 5906301811114 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 1.5 mm [±0,1 mm] |
| Weight | 1.27 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.87 kg / 8.51 N |
| Magnetic Induction ~ ? | 150.32 mT / 1503 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 modeling of the assembly - technical parameters
These information are the outcome of a engineering simulation. Values are based on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these data as a reference point for designers.
Table 1: Static pull force (force vs distance) - interaction chart
MW 12x1.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1503 Gs
150.3 mT
|
0.87 kg / 1.92 LBS
870.0 g / 8.5 N
|
safe |
| 1 mm |
1365 Gs
136.5 mT
|
0.72 kg / 1.58 LBS
718.1 g / 7.0 N
|
safe |
| 2 mm |
1163 Gs
116.3 mT
|
0.52 kg / 1.15 LBS
521.4 g / 5.1 N
|
safe |
| 3 mm |
947 Gs
94.7 mT
|
0.35 kg / 0.76 LBS
345.7 g / 3.4 N
|
safe |
| 5 mm |
587 Gs
58.7 mT
|
0.13 kg / 0.29 LBS
132.6 g / 1.3 N
|
safe |
| 10 mm |
180 Gs
18.0 mT
|
0.01 kg / 0.03 LBS
12.5 g / 0.1 N
|
safe |
| 15 mm |
70 Gs
7.0 mT
|
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
|
safe |
| 20 mm |
33 Gs
3.3 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
safe |
| 30 mm |
11 Gs
1.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Slippage hold (vertical surface)
MW 12x1.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.17 kg / 0.38 LBS
174.0 g / 1.7 N
|
| 1 mm | Stal (~0.2) |
0.14 kg / 0.32 LBS
144.0 g / 1.4 N
|
| 2 mm | Stal (~0.2) |
0.10 kg / 0.23 LBS
104.0 g / 1.0 N
|
| 3 mm | Stal (~0.2) |
0.07 kg / 0.15 LBS
70.0 g / 0.7 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.06 LBS
26.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 12x1.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.26 kg / 0.58 LBS
261.0 g / 2.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.17 kg / 0.38 LBS
174.0 g / 1.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.09 kg / 0.19 LBS
87.0 g / 0.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.44 kg / 0.96 LBS
435.0 g / 4.3 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 12x1.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.09 kg / 0.19 LBS
87.0 g / 0.9 N
|
| 1 mm |
|
0.22 kg / 0.48 LBS
217.5 g / 2.1 N
|
| 2 mm |
|
0.44 kg / 0.96 LBS
435.0 g / 4.3 N
|
| 3 mm |
|
0.65 kg / 1.44 LBS
652.5 g / 6.4 N
|
| 5 mm |
|
0.87 kg / 1.92 LBS
870.0 g / 8.5 N
|
| 10 mm |
|
0.87 kg / 1.92 LBS
870.0 g / 8.5 N
|
| 11 mm |
|
0.87 kg / 1.92 LBS
870.0 g / 8.5 N
|
| 12 mm |
|
0.87 kg / 1.92 LBS
870.0 g / 8.5 N
|
Table 5: Working in heat (material behavior) - power drop
MW 12x1.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.87 kg / 1.92 LBS
870.0 g / 8.5 N
|
OK |
| 40 °C | -2.2% |
0.85 kg / 1.88 LBS
850.9 g / 8.3 N
|
OK |
| 60 °C | -4.4% |
0.83 kg / 1.83 LBS
831.7 g / 8.2 N
|
|
| 80 °C | -6.6% |
0.81 kg / 1.79 LBS
812.6 g / 8.0 N
|
|
| 100 °C | -28.8% |
0.62 kg / 1.37 LBS
619.4 g / 6.1 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 12x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.57 kg / 3.47 LBS
2 770 Gs
|
0.24 kg / 0.52 LBS
236 g / 2.3 N
|
N/A |
| 1 mm |
1.46 kg / 3.21 LBS
2 891 Gs
|
0.22 kg / 0.48 LBS
219 g / 2.1 N
|
1.31 kg / 2.89 LBS
~0 Gs
|
| 2 mm |
1.30 kg / 2.87 LBS
2 731 Gs
|
0.19 kg / 0.43 LBS
195 g / 1.9 N
|
1.17 kg / 2.58 LBS
~0 Gs
|
| 3 mm |
1.12 kg / 2.48 LBS
2 538 Gs
|
0.17 kg / 0.37 LBS
168 g / 1.7 N
|
1.01 kg / 2.23 LBS
~0 Gs
|
| 5 mm |
0.78 kg / 1.71 LBS
2 109 Gs
|
0.12 kg / 0.26 LBS
116 g / 1.1 N
|
0.70 kg / 1.54 LBS
~0 Gs
|
| 10 mm |
0.24 kg / 0.53 LBS
1 173 Gs
|
0.04 kg / 0.08 LBS
36 g / 0.4 N
|
0.22 kg / 0.48 LBS
~0 Gs
|
| 20 mm |
0.02 kg / 0.05 LBS
361 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
36 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
22 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 LBS
14 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 LBS
10 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 LBS
7 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 LBS
5 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MW 12x1.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 12x1.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.59 km/h
(6.27 m/s)
|
0.02 J | |
| 30 mm |
22.74 km/h
(6.32 m/s)
|
0.03 J | |
| 50 mm |
22.74 km/h
(6.32 m/s)
|
0.03 J | |
| 100 mm |
22.74 km/h
(6.32 m/s)
|
0.03 J |
Table 9: Coating parameters (durability)
MW 12x1.5 / 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 (Pc)
MW 12x1.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 159 Mx | 21.6 µWb |
| Pc Coefficient | 0.19 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 12x1.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.87 kg | Standard |
| Water (riverbed) |
1.00 kg
(+0.13 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet retains just a fraction of its max power.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Power loss vs temp
*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) = 0.19
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.
Material specification
| 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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Strengths as well as weaknesses of neodymium magnets.
Pros
- They do not lose strength, even over nearly ten years – the reduction in lifting capacity is only ~1% (theoretically),
- Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
- Thanks to the reflective finish, the layer of Ni-Cu-Ni, gold, or silver gives an aesthetic appearance,
- Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Considering the potential of flexible shaping and adaptation to specialized projects, NdFeB magnets can be modeled in a broad palette of forms and dimensions, which increases their versatility,
- Significant place in electronics industry – they are utilized in mass storage devices, drive modules, advanced medical instruments, as well as industrial machines.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Cons
- At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and 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, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- We recommend a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is economically unviable,
Holding force characteristics
Detachment force of the magnet in optimal conditions – what it depends on?
- with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- whose transverse dimension reaches at least 10 mm
- with an ideally smooth contact surface
- without the slightest insulating layer between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- in temp. approx. 20°C
Key elements affecting lifting force
- Distance – existence of any layer (rust, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material composition – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
- Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Safety rules for work with NdFeB magnets
Phone sensors
GPS units and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.
Protect data
Device Safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).
Conscious usage
Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.
Implant safety
Patients with a ICD should keep an absolute distance from magnets. The magnetism can stop the functioning of the life-saving device.
Do not drill into magnets
Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.
Thermal limits
Keep cool. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Physical harm
Risk of injury: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Product not for children
Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.
Warning for allergy sufferers
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.
Material brittleness
Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.
