MW 8x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010102
GTIN/EAN: 5906301811015
- Diameter Ø
- 8 mm [±0,1 mm]
- Height
- 15 mm [±0,1 mm]
- Weight
- 5.65 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
2.80 zł net / pcs
3.44 zł with VAT (23% VAT) / 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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Physical properties - MW 8x15 / N38 - cylindrical magnet
Specification / characteristics - MW 8x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010102 |
| GTIN/EAN | 5906301811015 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 5.65 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.47 kg / 14.45 N |
| Magnetic Induction ~ ? | 598.12 mT / 5981 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 - report
Presented values constitute the outcome of a mathematical simulation. Results were calculated on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Use these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs gap) - characteristics
MW 8x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5975 Gs
597.5 mT
|
1.47 kg / 3.24 lbs
1470.0 g / 14.4 N
|
weak grip |
| 1 mm |
4511 Gs
451.1 mT
|
0.84 kg / 1.85 lbs
837.8 g / 8.2 N
|
weak grip |
| 2 mm |
3262 Gs
326.2 mT
|
0.44 kg / 0.97 lbs
438.2 g / 4.3 N
|
weak grip |
| 3 mm |
2332 Gs
233.2 mT
|
0.22 kg / 0.49 lbs
224.0 g / 2.2 N
|
weak grip |
| 5 mm |
1238 Gs
123.8 mT
|
0.06 kg / 0.14 lbs
63.1 g / 0.6 N
|
weak grip |
| 10 mm |
366 Gs
36.6 mT
|
0.01 kg / 0.01 lbs
5.5 g / 0.1 N
|
weak grip |
| 15 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 lbs
1.0 g / 0.0 N
|
weak grip |
| 20 mm |
80 Gs
8.0 mT
|
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
|
weak grip |
| 30 mm |
30 Gs
3.0 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
8 Gs
0.8 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage capacity (vertical surface)
MW 8x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.29 kg / 0.65 lbs
294.0 g / 2.9 N
|
| 1 mm | Stal (~0.2) |
0.17 kg / 0.37 lbs
168.0 g / 1.6 N
|
| 2 mm | Stal (~0.2) |
0.09 kg / 0.19 lbs
88.0 g / 0.9 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.10 lbs
44.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 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: Wall mounting (shearing) - behavior on slippery surfaces
MW 8x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.44 kg / 0.97 lbs
441.0 g / 4.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.29 kg / 0.65 lbs
294.0 g / 2.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.15 kg / 0.32 lbs
147.0 g / 1.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.74 kg / 1.62 lbs
735.0 g / 7.2 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.15 kg / 0.32 lbs
147.0 g / 1.4 N
|
| 1 mm |
|
0.37 kg / 0.81 lbs
367.5 g / 3.6 N
|
| 2 mm |
|
0.74 kg / 1.62 lbs
735.0 g / 7.2 N
|
| 3 mm |
|
1.10 kg / 2.43 lbs
1102.5 g / 10.8 N
|
| 5 mm |
|
1.47 kg / 3.24 lbs
1470.0 g / 14.4 N
|
| 10 mm |
|
1.47 kg / 3.24 lbs
1470.0 g / 14.4 N
|
| 11 mm |
|
1.47 kg / 3.24 lbs
1470.0 g / 14.4 N
|
| 12 mm |
|
1.47 kg / 3.24 lbs
1470.0 g / 14.4 N
|
Table 5: Thermal stability (stability) - resistance threshold
MW 8x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.47 kg / 3.24 lbs
1470.0 g / 14.4 N
|
OK |
| 40 °C | -2.2% |
1.44 kg / 3.17 lbs
1437.7 g / 14.1 N
|
OK |
| 60 °C | -4.4% |
1.41 kg / 3.10 lbs
1405.3 g / 13.8 N
|
OK |
| 80 °C | -6.6% |
1.37 kg / 3.03 lbs
1373.0 g / 13.5 N
|
|
| 100 °C | -28.8% |
1.05 kg / 2.31 lbs
1046.6 g / 10.3 N
|
Table 6: Two magnets (repulsion) - field collision
MW 8x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
11.06 kg / 24.39 lbs
6 130 Gs
|
1.66 kg / 3.66 lbs
1660 g / 16.3 N
|
N/A |
| 1 mm |
8.49 kg / 18.72 lbs
10 469 Gs
|
1.27 kg / 2.81 lbs
1274 g / 12.5 N
|
7.64 kg / 16.85 lbs
~0 Gs
|
| 2 mm |
6.31 kg / 13.90 lbs
9 022 Gs
|
0.95 kg / 2.09 lbs
946 g / 9.3 N
|
5.68 kg / 12.51 lbs
~0 Gs
|
| 3 mm |
4.59 kg / 10.12 lbs
7 697 Gs
|
0.69 kg / 1.52 lbs
688 g / 6.8 N
|
4.13 kg / 9.11 lbs
~0 Gs
|
| 5 mm |
2.36 kg / 5.20 lbs
5 516 Gs
|
0.35 kg / 0.78 lbs
354 g / 3.5 N
|
2.12 kg / 4.68 lbs
~0 Gs
|
| 10 mm |
0.48 kg / 1.05 lbs
2 476 Gs
|
0.07 kg / 0.16 lbs
71 g / 0.7 N
|
0.43 kg / 0.94 lbs
~0 Gs
|
| 20 mm |
0.04 kg / 0.09 lbs
731 Gs
|
0.01 kg / 0.01 lbs
6 g / 0.1 N
|
0.04 kg / 0.08 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
94 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
60 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
41 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
29 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
21 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
16 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MW 8x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 8x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
10.47 km/h
(2.91 m/s)
|
0.02 J | |
| 30 mm |
10.51 km/h
(2.92 m/s)
|
0.02 J | |
| 50 mm |
10.51 km/h
(2.92 m/s)
|
0.02 J | |
| 100 mm |
10.51 km/h
(2.92 m/s)
|
0.02 J |
Table 9: Corrosion resistance
MW 8x15 / 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 8x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 306 Mx | 33.1 µWb |
| Pc Coefficient | 1.19 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MW 8x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.47 kg | Standard |
| Water (riverbed) |
1.68 kg
(+0.21 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical surface, the magnet holds merely a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Thermal stability
*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) = 1.19
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.
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% |
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.
Strengths
- They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
- They retain their magnetic properties even under close interference source,
- A magnet with a smooth gold surface has better aesthetics,
- Magnets are distinguished by maximum magnetic induction on the outer layer,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Possibility of accurate shaping as well as optimizing to defined needs,
- Versatile presence in advanced technology sectors – they are used in magnetic memories, electric motors, advanced medical instruments, also modern systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in realizing threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- using a sheet made of mild steel, serving as a circuit closing element
- whose thickness is min. 10 mm
- with a plane free of scratches
- under conditions of no distance (surface-to-surface)
- during detachment in a direction perpendicular to the mounting surface
- at ambient temperature approx. 20 degrees Celsius
Practical aspects of lifting capacity – factors
- Clearance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
- Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
H&S for magnets
Do not underestimate power
Use magnets with awareness. Their huge power can shock even experienced users. Stay alert and do not underestimate their power.
Material brittleness
Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.
Implant safety
Patients with a ICD must maintain an safe separation from magnets. The magnetic field can disrupt the operation of the implant.
Adults only
These products are not toys. Swallowing multiple magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.
Allergy Warning
Certain individuals experience a contact allergy to Ni, which is the common plating for NdFeB magnets. Prolonged contact can result in an allergic reaction. We recommend use protective gloves.
Crushing risk
Pinching hazard: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Thermal limits
Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.
Threat to electronics
Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.
Flammability
Powder generated during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Keep away from electronics
Note: neodymium magnets produce a field that interferes with precision electronics. Keep a safe distance from your phone, device, and GPS.
