MW 15x5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010031
GTIN/EAN: 5906301810308
- Diameter Ø
- 15 mm [±0,1 mm]
- Height
- 5 mm [±0,1 mm]
- Weight
- 6.63 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
2.60 zł net / pcs
3.20 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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Product card - MW 15x5 / N38 - cylindrical magnet
Specification / characteristics - MW 15x5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010031 |
| GTIN/EAN | 5906301810308 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 15 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 6.63 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 5.39 kg / 52.83 N |
| Magnetic Induction ~ ? | 343.70 mT / 3437 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 | 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 |
Engineering analysis of the assembly - report
These information are the outcome of a mathematical analysis. Values rely on algorithms for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these calculations as a reference point when designing systems.
Table 1: Static force (pull vs distance) - power drop
MW 15x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3436 Gs
343.6 mT
|
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
|
warning |
| 1 mm |
3054 Gs
305.4 mT
|
4.26 kg / 9.39 pounds
4258.2 g / 41.8 N
|
warning |
| 2 mm |
2633 Gs
263.3 mT
|
3.17 kg / 6.98 pounds
3165.4 g / 31.1 N
|
warning |
| 3 mm |
2221 Gs
222.1 mT
|
2.25 kg / 4.96 pounds
2251.5 g / 22.1 N
|
warning |
| 5 mm |
1521 Gs
152.1 mT
|
1.06 kg / 2.33 pounds
1056.2 g / 10.4 N
|
low risk |
| 10 mm |
585 Gs
58.5 mT
|
0.16 kg / 0.35 pounds
156.5 g / 1.5 N
|
low risk |
| 15 mm |
260 Gs
26.0 mT
|
0.03 kg / 0.07 pounds
30.8 g / 0.3 N
|
low risk |
| 20 mm |
133 Gs
13.3 mT
|
0.01 kg / 0.02 pounds
8.1 g / 0.1 N
|
low risk |
| 30 mm |
47 Gs
4.7 mT
|
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
|
low risk |
| 50 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
Table 2: Vertical hold (vertical surface)
MW 15x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.08 kg / 2.38 pounds
1078.0 g / 10.6 N
|
| 1 mm | Stal (~0.2) |
0.85 kg / 1.88 pounds
852.0 g / 8.4 N
|
| 2 mm | Stal (~0.2) |
0.63 kg / 1.40 pounds
634.0 g / 6.2 N
|
| 3 mm | Stal (~0.2) |
0.45 kg / 0.99 pounds
450.0 g / 4.4 N
|
| 5 mm | Stal (~0.2) |
0.21 kg / 0.47 pounds
212.0 g / 2.1 N
|
| 10 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
32.0 g / 0.3 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 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 (shearing) - behavior on slippery surfaces
MW 15x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.62 kg / 3.56 pounds
1617.0 g / 15.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.08 kg / 2.38 pounds
1078.0 g / 10.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.54 kg / 1.19 pounds
539.0 g / 5.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.70 kg / 5.94 pounds
2695.0 g / 26.4 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 15x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.54 kg / 1.19 pounds
539.0 g / 5.3 N
|
| 1 mm |
|
1.35 kg / 2.97 pounds
1347.5 g / 13.2 N
|
| 2 mm |
|
2.70 kg / 5.94 pounds
2695.0 g / 26.4 N
|
| 3 mm |
|
4.04 kg / 8.91 pounds
4042.5 g / 39.7 N
|
| 5 mm |
|
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
|
| 10 mm |
|
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
|
| 11 mm |
|
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
|
| 12 mm |
|
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
|
Table 5: Thermal stability (stability) - thermal limit
MW 15x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
|
OK |
| 40 °C | -2.2% |
5.27 kg / 11.62 pounds
5271.4 g / 51.7 N
|
OK |
| 60 °C | -4.4% |
5.15 kg / 11.36 pounds
5152.8 g / 50.5 N
|
|
| 80 °C | -6.6% |
5.03 kg / 11.10 pounds
5034.3 g / 49.4 N
|
|
| 100 °C | -28.8% |
3.84 kg / 8.46 pounds
3837.7 g / 37.6 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 15x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
12.86 kg / 28.35 pounds
4 954 Gs
|
1.93 kg / 4.25 pounds
1929 g / 18.9 N
|
N/A |
| 1 mm |
11.54 kg / 25.43 pounds
6 508 Gs
|
1.73 kg / 3.81 pounds
1730 g / 17.0 N
|
10.38 kg / 22.89 pounds
~0 Gs
|
| 2 mm |
10.16 kg / 22.40 pounds
6 107 Gs
|
1.52 kg / 3.36 pounds
1524 g / 14.9 N
|
9.14 kg / 20.16 pounds
~0 Gs
|
| 3 mm |
8.82 kg / 19.44 pounds
5 689 Gs
|
1.32 kg / 2.92 pounds
1322 g / 13.0 N
|
7.93 kg / 17.49 pounds
~0 Gs
|
| 5 mm |
6.40 kg / 14.11 pounds
4 847 Gs
|
0.96 kg / 2.12 pounds
960 g / 9.4 N
|
5.76 kg / 12.70 pounds
~0 Gs
|
| 10 mm |
2.52 kg / 5.56 pounds
3 042 Gs
|
0.38 kg / 0.83 pounds
378 g / 3.7 N
|
2.27 kg / 5.00 pounds
~0 Gs
|
| 20 mm |
0.37 kg / 0.82 pounds
1 171 Gs
|
0.06 kg / 0.12 pounds
56 g / 0.5 N
|
0.34 kg / 0.74 pounds
~0 Gs
|
| 50 mm |
0.01 kg / 0.01 pounds
153 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 / 0.01 pounds
95 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
63 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
44 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
32 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 (implants) - warnings
MW 15x5 / 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 |
| Car key | 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 (kinetic energy) - warning
MW 15x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
25.33 km/h
(7.04 m/s)
|
0.16 J | |
| 30 mm |
25.70 km/h
(7.14 m/s)
|
0.17 J | |
| 50 mm |
25.70 km/h
(7.14 m/s)
|
0.17 J | |
| 100 mm |
25.70 km/h
(7.14 m/s)
|
0.17 J |
Table 9: Corrosion resistance
MW 15x5 / 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 15x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 428 Mx | 64.3 µWb |
| Pc Coefficient | 0.44 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 15x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 5.39 kg | Standard |
| Water (riverbed) |
6.17 kg
(+0.78 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet retains just a fraction of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Power loss vs temp
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.44
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also deals
Strengths as well as weaknesses of rare earth magnets.
Pros
- They retain attractive force for nearly ten years – the drop is just ~1% (according to analyses),
- They show high resistance to demagnetization induced by external disturbances,
- The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to look better,
- Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of precise shaping as well as adapting to concrete applications,
- Fundamental importance in electronics industry – they serve a role in mass storage devices, electric drive systems, advanced medical instruments, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems
Limitations
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
- Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
- Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small components of these magnets can be problematic in diagnostics medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the use of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a thickness of min. 10 mm to ensure full flux closure
- with an polished touching surface
- under conditions of gap-free contact (metal-to-metal)
- under perpendicular application of breakaway force (90-degree angle)
- at temperature approx. 20 degrees Celsius
Practical lifting capacity: influencing factors
- Air gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
- Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Material type – the best choice is high-permeability steel. Stainless steels may attract less.
- Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the load capacity.
Precautions when working with NdFeB magnets
Swallowing risk
Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are tragic.
Protect data
Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can destroy these devices and erase data from cards.
Thermal limits
Watch the temperature. Heating the magnet to high heat will ruin its properties and pulling force.
GPS and phone interference
A strong magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Keep magnets near a smartphone to prevent damaging the sensors.
Handling rules
Be careful. Rare earth magnets act from a distance and connect with massive power, often faster than you can react.
Allergic reactions
Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact or choose coated magnets.
Fire warning
Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
ICD Warning
Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
Bone fractures
Watch your fingers. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!
Eye protection
Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.
