MW 12x1 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010015
GTIN/EAN: 5906301810148
Diameter Ø
12 mm [±0,1 mm]
Height
1 mm [±0,1 mm]
Weight
0.85 g
Magnetization Direction
↑ axial
Load capacity
0.42 kg / 4.15 N
Magnetic Induction
101.90 mT / 1019 Gs
Coating
[NiCuNi] Nickel
0.578 ZŁ with VAT / pcs + price for transport
0.470 ZŁ net + 23% VAT / pcs
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Technical of the product - MW 12x1 / N38 - cylindrical magnet
Specification / characteristics - MW 12x1 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010015 |
| GTIN/EAN | 5906301810148 |
| 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 mm [±0,1 mm] |
| Weight | 0.85 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.42 kg / 4.15 N |
| Magnetic Induction ~ ? | 101.90 mT / 1019 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 |
Physical modeling of the magnet - data
The following data constitute the result of a engineering calculation. Values rely on models for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (force vs gap) - power drop
MW 12x1 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1019 Gs
101.9 mT
|
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
low risk |
| 1 mm |
941 Gs
94.1 mT
|
0.36 kg / 0.79 lbs
358.5 g / 3.5 N
|
low risk |
| 2 mm |
812 Gs
81.2 mT
|
0.27 kg / 0.59 lbs
266.8 g / 2.6 N
|
low risk |
| 3 mm |
666 Gs
66.6 mT
|
0.18 kg / 0.40 lbs
179.7 g / 1.8 N
|
low risk |
| 5 mm |
415 Gs
41.5 mT
|
0.07 kg / 0.15 lbs
69.7 g / 0.7 N
|
low risk |
| 10 mm |
126 Gs
12.6 mT
|
0.01 kg / 0.01 lbs
6.5 g / 0.1 N
|
low risk |
| 15 mm |
49 Gs
4.9 mT
|
0.00 kg / 0.00 lbs
1.0 g / 0.0 N
|
low risk |
| 20 mm |
23 Gs
2.3 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
low risk |
| 30 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
Table 2: Slippage hold (vertical surface)
MW 12x1 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| 1 mm | Stal (~0.2) |
0.07 kg / 0.16 lbs
72.0 g / 0.7 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.12 lbs
54.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.08 lbs
36.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
14.0 g / 0.1 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: Vertical assembly (sliding) - vertical pull
MW 12x1 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.13 kg / 0.28 lbs
126.0 g / 1.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.04 kg / 0.09 lbs
42.0 g / 0.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.21 kg / 0.46 lbs
210.0 g / 2.1 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 12x1 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.04 kg / 0.09 lbs
42.0 g / 0.4 N
|
| 1 mm |
|
0.11 kg / 0.23 lbs
105.0 g / 1.0 N
|
| 2 mm |
|
0.21 kg / 0.46 lbs
210.0 g / 2.1 N
|
| 3 mm |
|
0.32 kg / 0.69 lbs
315.0 g / 3.1 N
|
| 5 mm |
|
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
| 10 mm |
|
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
| 11 mm |
|
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
| 12 mm |
|
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MW 12x1 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
OK |
| 40 °C | -2.2% |
0.41 kg / 0.91 lbs
410.8 g / 4.0 N
|
OK |
| 60 °C | -4.4% |
0.40 kg / 0.89 lbs
401.5 g / 3.9 N
|
|
| 80 °C | -6.6% |
0.39 kg / 0.86 lbs
392.3 g / 3.8 N
|
|
| 100 °C | -28.8% |
0.30 kg / 0.66 lbs
299.0 g / 2.9 N
|
Table 6: Two magnets (attraction) - field collision
MW 12x1 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
0.72 kg / 1.60 lbs
1 959 Gs
|
0.11 kg / 0.24 lbs
109 g / 1.1 N
|
N/A |
| 1 mm |
0.68 kg / 1.50 lbs
1 978 Gs
|
0.10 kg / 0.23 lbs
102 g / 1.0 N
|
0.61 kg / 1.35 lbs
~0 Gs
|
| 2 mm |
0.62 kg / 1.36 lbs
1 883 Gs
|
0.09 kg / 0.20 lbs
93 g / 0.9 N
|
0.56 kg / 1.23 lbs
~0 Gs
|
| 3 mm |
0.54 kg / 1.19 lbs
1 762 Gs
|
0.08 kg / 0.18 lbs
81 g / 0.8 N
|
0.49 kg / 1.07 lbs
~0 Gs
|
| 5 mm |
0.38 kg / 0.84 lbs
1 479 Gs
|
0.06 kg / 0.13 lbs
57 g / 0.6 N
|
0.34 kg / 0.76 lbs
~0 Gs
|
| 10 mm |
0.12 kg / 0.26 lbs
830 Gs
|
0.02 kg / 0.04 lbs
18 g / 0.2 N
|
0.11 kg / 0.24 lbs
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 lbs
253 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.02 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
25 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
15 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
10 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
7 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
5 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
3 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) - precautionary measures
MW 12x1 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (cracking risk) - warning
MW 12x1 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.63 km/h
(6.29 m/s)
|
0.02 J | |
| 30 mm |
38.83 km/h
(10.79 m/s)
|
0.05 J | |
| 50 mm |
50.13 km/h
(13.92 m/s)
|
0.08 J | |
| 100 mm |
70.89 km/h
(19.69 m/s)
|
0.16 J |
Table 9: Coating parameters (durability)
MW 12x1 / 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 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 564 Mx | 15.6 µWb |
| Pc Coefficient | 0.13 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 12x1 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.42 kg | Standard |
| Water (riverbed) |
0.48 kg
(+0.06 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical surface, the magnet holds only ~20% of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Power loss vs temp
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths as well as weaknesses of neodymium magnets.
Strengths
- Their power is maintained, and after around ten years it decreases only by ~1% (theoretically),
- They are resistant to demagnetization induced by external magnetic fields,
- A magnet with a shiny silver surface has better aesthetics,
- Magnetic induction on the surface of the magnet turns out to be impressive,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of accurate creating and adapting to individual applications,
- Huge importance in electronics industry – they are commonly used in computer drives, electric motors, precision medical tools, and complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Limitations
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
- Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
- Due to limitations in realizing nuts and complex shapes in magnets, we propose using a housing - magnetic mount.
- Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
- With budget limitations the cost of neodymium magnets is a challenge,
Pull force analysis
Highest magnetic holding force – what it depends on?
- using a plate made of low-carbon steel, serving as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- with an polished touching surface
- under conditions of gap-free contact (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Load vector – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
- Plate texture – ground elements ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
- Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the holding force.
Safety rules for work with neodymium magnets
Beware of splinters
Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.
Protect data
Data protection: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).
Bodily injuries
Danger of trauma: The pulling power is so great that it can cause blood blisters, crushing, and broken bones. Protective gloves are recommended.
Life threat
Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can disrupt the functioning of the life-saving device.
Operating temperature
Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
GPS and phone interference
Be aware: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.
Dust is flammable
Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
Adults only
Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.
Powerful field
Use magnets consciously. Their immense force can surprise even experienced users. Be vigilant and respect their force.
Skin irritation risks
A percentage of the population experience a sensitization to Ni, which is the standard coating for NdFeB magnets. Extended handling might lead to an allergic reaction. We recommend use safety gloves.
