MW 12x8 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010022
GTIN/EAN: 5906301810216
- Diameter Ø
- 12 mm [±0,1 mm]
- Height
- 8 mm [±0,1 mm]
- Weight
- 6.79 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
2.01 zł net / pcs
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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 details - MW 12x8 / N38 - cylindrical magnet
Specification / characteristics - MW 12x8 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010022 |
| GTIN/EAN | 5906301810216 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 8 mm [±0,1 mm] |
| Weight | 6.79 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.93 kg / 48.32 N |
| Magnetic Induction ~ ? | 495.50 mT / 4955 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 |
Physical analysis of the product - data
These information represent the outcome of a mathematical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static force (pull vs distance) - interaction chart
MW 12x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4952 Gs
495.2 mT
|
4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
|
strong |
| 1 mm |
4139 Gs
413.9 mT
|
3.44 kg / 7.59 LBS
3445.0 g / 33.8 N
|
strong |
| 2 mm |
3356 Gs
335.6 mT
|
2.26 kg / 4.99 LBS
2264.2 g / 22.2 N
|
strong |
| 3 mm |
2670 Gs
267.0 mT
|
1.43 kg / 3.16 LBS
1433.5 g / 14.1 N
|
weak grip |
| 5 mm |
1660 Gs
166.0 mT
|
0.55 kg / 1.22 LBS
554.1 g / 5.4 N
|
weak grip |
| 10 mm |
565 Gs
56.5 mT
|
0.06 kg / 0.14 LBS
64.3 g / 0.6 N
|
weak grip |
| 15 mm |
243 Gs
24.3 mT
|
0.01 kg / 0.03 LBS
11.8 g / 0.1 N
|
weak grip |
| 20 mm |
124 Gs
12.4 mT
|
0.00 kg / 0.01 LBS
3.1 g / 0.0 N
|
weak grip |
| 30 mm |
45 Gs
4.5 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
weak grip |
| 50 mm |
11 Gs
1.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Sliding load (wall)
MW 12x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.99 kg / 2.17 LBS
986.0 g / 9.7 N
|
| 1 mm | Stal (~0.2) |
0.69 kg / 1.52 LBS
688.0 g / 6.7 N
|
| 2 mm | Stal (~0.2) |
0.45 kg / 1.00 LBS
452.0 g / 4.4 N
|
| 3 mm | Stal (~0.2) |
0.29 kg / 0.63 LBS
286.0 g / 2.8 N
|
| 5 mm | Stal (~0.2) |
0.11 kg / 0.24 LBS
110.0 g / 1.1 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
12.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 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: Vertical assembly (sliding) - behavior on slippery surfaces
MW 12x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.48 kg / 3.26 LBS
1479.0 g / 14.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.99 kg / 2.17 LBS
986.0 g / 9.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.49 kg / 1.09 LBS
493.0 g / 4.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.47 kg / 5.43 LBS
2465.0 g / 24.2 N
|
Table 4: Material efficiency (saturation) - power losses
MW 12x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.49 kg / 1.09 LBS
493.0 g / 4.8 N
|
| 1 mm |
|
1.23 kg / 2.72 LBS
1232.5 g / 12.1 N
|
| 2 mm |
|
2.47 kg / 5.43 LBS
2465.0 g / 24.2 N
|
| 3 mm |
|
3.70 kg / 8.15 LBS
3697.5 g / 36.3 N
|
| 5 mm |
|
4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
|
| 10 mm |
|
4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
|
| 11 mm |
|
4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
|
| 12 mm |
|
4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
|
Table 5: Thermal resistance (material behavior) - power drop
MW 12x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
|
OK |
| 40 °C | -2.2% |
4.82 kg / 10.63 LBS
4821.5 g / 47.3 N
|
OK |
| 60 °C | -4.4% |
4.71 kg / 10.39 LBS
4713.1 g / 46.2 N
|
OK |
| 80 °C | -6.6% |
4.60 kg / 10.15 LBS
4604.6 g / 45.2 N
|
|
| 100 °C | -28.8% |
3.51 kg / 7.74 LBS
3510.2 g / 34.4 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 12x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
17.10 kg / 37.69 LBS
5 795 Gs
|
2.56 kg / 5.65 LBS
2565 g / 25.2 N
|
N/A |
| 1 mm |
14.44 kg / 31.83 LBS
9 101 Gs
|
2.17 kg / 4.77 LBS
2166 g / 21.2 N
|
12.99 kg / 28.64 LBS
~0 Gs
|
| 2 mm |
11.95 kg / 26.34 LBS
8 279 Gs
|
1.79 kg / 3.95 LBS
1792 g / 17.6 N
|
10.75 kg / 23.71 LBS
~0 Gs
|
| 3 mm |
9.74 kg / 21.48 LBS
7 477 Gs
|
1.46 kg / 3.22 LBS
1462 g / 14.3 N
|
8.77 kg / 19.33 LBS
~0 Gs
|
| 5 mm |
6.27 kg / 13.82 LBS
5 997 Gs
|
0.94 kg / 2.07 LBS
940 g / 9.2 N
|
5.64 kg / 12.44 LBS
~0 Gs
|
| 10 mm |
1.92 kg / 4.24 LBS
3 320 Gs
|
0.29 kg / 0.64 LBS
288 g / 2.8 N
|
1.73 kg / 3.81 LBS
~0 Gs
|
| 20 mm |
0.22 kg / 0.49 LBS
1 131 Gs
|
0.03 kg / 0.07 LBS
33 g / 0.3 N
|
0.20 kg / 0.44 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 LBS
142 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
89 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
59 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
41 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
30 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
23 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 12x8 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 7.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 4.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.5 cm |
| Remote | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (cracking risk) - collision effects
MW 12x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.99 km/h
(5.83 m/s)
|
0.12 J | |
| 30 mm |
21.17 km/h
(5.88 m/s)
|
0.12 J | |
| 50 mm |
21.17 km/h
(5.88 m/s)
|
0.12 J | |
| 100 mm |
21.17 km/h
(5.88 m/s)
|
0.12 J |
Table 9: Coating parameters (durability)
MW 12x8 / 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: Electrical data (Pc)
MW 12x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 650 Mx | 56.5 µWb |
| Pc Coefficient | 0.71 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 12x8 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.93 kg | Standard |
| Water (riverbed) |
5.64 kg
(+0.71 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.
3. Temperature resistance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71
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.
Elemental analysis
| 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 |
View also proposals
Pros and cons of Nd2Fe14B magnets.
Benefits
- They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
- They possess excellent resistance to magnetic field loss due to external fields,
- By using a decorative layer of nickel, the element acquires an elegant look,
- Magnetic induction on the surface of the magnet remains very high,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to modularity in forming and the capacity to customize to complex applications,
- Huge importance in advanced technology sectors – they are utilized in magnetic memories, electromotive mechanisms, medical equipment, also modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions
Limitations
- At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
- Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these products can be problematic in diagnostics medical after entering the body.
- Due to complex production process, their price is higher than average,
Pull force analysis
Highest magnetic holding force – what affects it?
- with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- characterized by smoothness
- under conditions of ideal adhesion (metal-to-metal)
- during pulling in a direction vertical to the plane
- at ambient temperature room level
Determinants of lifting force in real conditions
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Plate material – mild steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
- Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate reduces the holding force.
Warnings
Safe distance
Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).
Shattering risk
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Bone fractures
Risk of injury: The attraction force is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Powerful field
Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.
Sensitization to coating
A percentage of the population experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause skin redness. It is best to use safety gloves.
Precision electronics
GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.
Combustion hazard
Powder produced during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Choking Hazard
NdFeB magnets are not intended for children. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.
Demagnetization risk
Keep cool. Neodymium magnets are susceptible to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).
Implant safety
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
