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
Load capacity
4.93 kg / 48.32 N
Magnetic Induction
495.50 mT / 4955 Gs
Coating
[NiCuNi] Nickel
2.47 ZŁ with VAT / pcs + price for transport
2.01 ZŁ net + 23% VAT / pcs
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Technical of the product - 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 |
|---|---|---|
| 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 |
Technical modeling of the product - technical parameters
Presented values represent the result of a mathematical analysis. Results were calculated on models for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Use these data as a preliminary roadmap when designing systems.
Table 1: Static pull 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 pounds
4930.0 g / 48.4 N
|
medium risk |
| 1 mm |
4139 Gs
413.9 mT
|
3.44 kg / 7.59 pounds
3445.0 g / 33.8 N
|
medium risk |
| 2 mm |
3356 Gs
335.6 mT
|
2.26 kg / 4.99 pounds
2264.2 g / 22.2 N
|
medium risk |
| 3 mm |
2670 Gs
267.0 mT
|
1.43 kg / 3.16 pounds
1433.5 g / 14.1 N
|
safe |
| 5 mm |
1660 Gs
166.0 mT
|
0.55 kg / 1.22 pounds
554.1 g / 5.4 N
|
safe |
| 10 mm |
565 Gs
56.5 mT
|
0.06 kg / 0.14 pounds
64.3 g / 0.6 N
|
safe |
| 15 mm |
243 Gs
24.3 mT
|
0.01 kg / 0.03 pounds
11.8 g / 0.1 N
|
safe |
| 20 mm |
124 Gs
12.4 mT
|
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
|
safe |
| 30 mm |
45 Gs
4.5 mT
|
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
|
safe |
| 50 mm |
11 Gs
1.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Shear hold (wall)
MW 12x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.99 kg / 2.17 pounds
986.0 g / 9.7 N
|
| 1 mm | Stal (~0.2) |
0.69 kg / 1.52 pounds
688.0 g / 6.7 N
|
| 2 mm | Stal (~0.2) |
0.45 kg / 1.00 pounds
452.0 g / 4.4 N
|
| 3 mm | Stal (~0.2) |
0.29 kg / 0.63 pounds
286.0 g / 2.8 N
|
| 5 mm | Stal (~0.2) |
0.11 kg / 0.24 pounds
110.0 g / 1.1 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
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 pounds
1479.0 g / 14.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.99 kg / 2.17 pounds
986.0 g / 9.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.49 kg / 1.09 pounds
493.0 g / 4.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.47 kg / 5.43 pounds
2465.0 g / 24.2 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 12x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.49 kg / 1.09 pounds
493.0 g / 4.8 N
|
| 1 mm |
|
1.23 kg / 2.72 pounds
1232.5 g / 12.1 N
|
| 2 mm |
|
2.47 kg / 5.43 pounds
2465.0 g / 24.2 N
|
| 3 mm |
|
3.70 kg / 8.15 pounds
3697.5 g / 36.3 N
|
| 5 mm |
|
4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
|
| 10 mm |
|
4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
|
| 11 mm |
|
4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
|
| 12 mm |
|
4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MW 12x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
|
OK |
| 40 °C | -2.2% |
4.82 kg / 10.63 pounds
4821.5 g / 47.3 N
|
OK |
| 60 °C | -4.4% |
4.71 kg / 10.39 pounds
4713.1 g / 46.2 N
|
OK |
| 80 °C | -6.6% |
4.60 kg / 10.15 pounds
4604.6 g / 45.2 N
|
|
| 100 °C | -28.8% |
3.51 kg / 7.74 pounds
3510.2 g / 34.4 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 12x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
17.10 kg / 37.69 pounds
5 795 Gs
|
2.56 kg / 5.65 pounds
2565 g / 25.2 N
|
N/A |
| 1 mm |
14.44 kg / 31.83 pounds
9 101 Gs
|
2.17 kg / 4.77 pounds
2166 g / 21.2 N
|
12.99 kg / 28.64 pounds
~0 Gs
|
| 2 mm |
11.95 kg / 26.34 pounds
8 279 Gs
|
1.79 kg / 3.95 pounds
1792 g / 17.6 N
|
10.75 kg / 23.71 pounds
~0 Gs
|
| 3 mm |
9.74 kg / 21.48 pounds
7 477 Gs
|
1.46 kg / 3.22 pounds
1462 g / 14.3 N
|
8.77 kg / 19.33 pounds
~0 Gs
|
| 5 mm |
6.27 kg / 13.82 pounds
5 997 Gs
|
0.94 kg / 2.07 pounds
940 g / 9.2 N
|
5.64 kg / 12.44 pounds
~0 Gs
|
| 10 mm |
1.92 kg / 4.24 pounds
3 320 Gs
|
0.29 kg / 0.64 pounds
288 g / 2.8 N
|
1.73 kg / 3.81 pounds
~0 Gs
|
| 20 mm |
0.22 kg / 0.49 pounds
1 131 Gs
|
0.03 kg / 0.07 pounds
33 g / 0.3 N
|
0.20 kg / 0.44 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 pounds
142 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
89 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
59 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
41 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
30 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
23 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (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 |
| Phone / Smartphone | 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: Impact energy (kinetic energy) - warning
MW 12x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
27.40 km/h
(7.61 m/s)
|
0.20 J | |
| 30 mm |
47.07 km/h
(13.08 m/s)
|
0.58 J | |
| 50 mm |
60.77 km/h
(16.88 m/s)
|
0.97 J | |
| 100 mm |
85.94 km/h
(23.87 m/s)
|
1.93 J |
Table 9: Anti-corrosion coating 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: Construction data (Flux)
MW 12x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 650 Mx | 56.5 µWb |
| Pc Coefficient | 0.71 | High (Stable) |
Table 11: Submerged application
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. Wall mount (shear)
*Warning: On a vertical surface, the magnet holds merely ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) severely reduces the holding force.
3. Heat tolerance
*For N38 grade, 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.
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 |
Other offers
Pros and cons of Nd2Fe14B magnets.
Benefits
- They retain attractive force for almost 10 years – the loss is just ~1% (according to analyses),
- They have excellent resistance to magnetic field loss due to external fields,
- In other words, due to the smooth surface of gold, the element looks attractive,
- Magnets have huge magnetic induction on the surface,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to the ability of accurate shaping and adaptation to unique needs, magnetic components can be modeled in a variety of shapes and sizes, which increases their versatility,
- Universal use in high-tech industry – they are utilized in HDD drives, drive modules, medical devices, as well as multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in compact constructions
Cons
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
- Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these devices can complicate diagnosis medical when they are in the body.
- Due to complex production process, their price is relatively high,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- on a base made of mild steel, optimally conducting the magnetic field
- with a cross-section minimum 10 mm
- characterized by even structure
- under conditions of gap-free contact (surface-to-surface)
- for force applied at a right angle (in the magnet axis)
- at temperature room level
What influences lifting capacity in practice
- Gap between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
- Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal reduce efficiency.
- Thermal environment – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.
Precautions when working with neodymium magnets
Safe operation
Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.
Compass and GPS
A powerful magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Do not bring magnets near a smartphone to avoid damaging the sensors.
This is not a toy
Only for adults. Tiny parts pose a choking risk, causing serious injuries. Store away from children and animals.
Thermal limits
Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.
Mechanical processing
Dust created during grinding of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.
Sensitization to coating
Studies show that the nickel plating (the usual finish) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or select encased magnets.
Implant safety
Patients with a ICD should keep an safe separation from magnets. The magnetic field can interfere with the functioning of the life-saving device.
Magnetic media
Device Safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, timepieces).
Magnet fragility
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.
Finger safety
Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.
