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
Load capacity
1.47 kg / 14.45 N
Magnetic Induction
598.12 mT / 5981 Gs
Coating
[NiCuNi] Nickel
3.44 ZŁ with VAT / pcs + price for transport
2.80 ZŁ net + 23% VAT / pcs
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Product card - 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 |
|---|---|---|
| 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 assembly - report
These values represent the direct effect of a physical simulation. Values rely on algorithms for the material Nd2Fe14B. Real-world parameters might slightly differ. Please consider these calculations as a reference point during assembly planning.
Table 1: Static force (force vs gap) - interaction chart
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 pounds
1470.0 g / 14.4 N
|
safe |
| 1 mm |
4511 Gs
451.1 mT
|
0.84 kg / 1.85 pounds
837.8 g / 8.2 N
|
safe |
| 2 mm |
3262 Gs
326.2 mT
|
0.44 kg / 0.97 pounds
438.2 g / 4.3 N
|
safe |
| 3 mm |
2332 Gs
233.2 mT
|
0.22 kg / 0.49 pounds
224.0 g / 2.2 N
|
safe |
| 5 mm |
1238 Gs
123.8 mT
|
0.06 kg / 0.14 pounds
63.1 g / 0.6 N
|
safe |
| 10 mm |
366 Gs
36.6 mT
|
0.01 kg / 0.01 pounds
5.5 g / 0.1 N
|
safe |
| 15 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
|
safe |
| 20 mm |
80 Gs
8.0 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
safe |
| 30 mm |
30 Gs
3.0 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
8 Gs
0.8 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Shear force (wall)
MW 8x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.29 kg / 0.65 pounds
294.0 g / 2.9 N
|
| 1 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
168.0 g / 1.6 N
|
| 2 mm | Stal (~0.2) |
0.09 kg / 0.19 pounds
88.0 g / 0.9 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.10 pounds
44.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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: Wall mounting (shearing) - vertical pull
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 pounds
441.0 g / 4.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.29 kg / 0.65 pounds
294.0 g / 2.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.15 kg / 0.32 pounds
147.0 g / 1.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.74 kg / 1.62 pounds
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 pounds
147.0 g / 1.4 N
|
| 1 mm |
|
0.37 kg / 0.81 pounds
367.5 g / 3.6 N
|
| 2 mm |
|
0.74 kg / 1.62 pounds
735.0 g / 7.2 N
|
| 3 mm |
|
1.10 kg / 2.43 pounds
1102.5 g / 10.8 N
|
| 5 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
| 10 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
| 11 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
| 12 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
Table 5: Working in heat (material behavior) - power drop
MW 8x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
OK |
| 40 °C | -2.2% |
1.44 kg / 3.17 pounds
1437.7 g / 14.1 N
|
OK |
| 60 °C | -4.4% |
1.41 kg / 3.10 pounds
1405.3 g / 13.8 N
|
OK |
| 80 °C | -6.6% |
1.37 kg / 3.03 pounds
1373.0 g / 13.5 N
|
|
| 100 °C | -28.8% |
1.05 kg / 2.31 pounds
1046.6 g / 10.3 N
|
Table 6: Two magnets (attraction) - 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 pounds
6 130 Gs
|
1.66 kg / 3.66 pounds
1660 g / 16.3 N
|
N/A |
| 1 mm |
8.49 kg / 18.72 pounds
10 469 Gs
|
1.27 kg / 2.81 pounds
1274 g / 12.5 N
|
7.64 kg / 16.85 pounds
~0 Gs
|
| 2 mm |
6.31 kg / 13.90 pounds
9 022 Gs
|
0.95 kg / 2.09 pounds
946 g / 9.3 N
|
5.68 kg / 12.51 pounds
~0 Gs
|
| 3 mm |
4.59 kg / 10.12 pounds
7 697 Gs
|
0.69 kg / 1.52 pounds
688 g / 6.8 N
|
4.13 kg / 9.11 pounds
~0 Gs
|
| 5 mm |
2.36 kg / 5.20 pounds
5 516 Gs
|
0.35 kg / 0.78 pounds
354 g / 3.5 N
|
2.12 kg / 4.68 pounds
~0 Gs
|
| 10 mm |
0.48 kg / 1.05 pounds
2 476 Gs
|
0.07 kg / 0.16 pounds
71 g / 0.7 N
|
0.43 kg / 0.94 pounds
~0 Gs
|
| 20 mm |
0.04 kg / 0.09 pounds
731 Gs
|
0.01 kg / 0.01 pounds
6 g / 0.1 N
|
0.04 kg / 0.08 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
94 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
60 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
41 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
29 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
21 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
16 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (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 |
| Timepiece | 20 Gs (2.0 mT) | 4.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.0 cm |
| Remote | 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: Dynamics (cracking risk) - collision effects
MW 8x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.31 km/h
(4.53 m/s)
|
0.06 J | |
| 30 mm |
28.18 km/h
(7.83 m/s)
|
0.17 J | |
| 50 mm |
36.37 km/h
(10.10 m/s)
|
0.29 J | |
| 100 mm |
51.44 km/h
(14.29 m/s)
|
0.58 J |
Table 9: Coating parameters (durability)
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 (Pc)
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. Sliding resistance
*Caution: On a vertical wall, the magnet holds just ~20% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens 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) = 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
Advantages as well as disadvantages of neodymium magnets.
Advantages
- Their power is durable, and after around ten years it decreases only by ~1% (theoretically),
- They retain their magnetic properties even under close interference source,
- In other words, due to the metallic layer of gold, the element gains a professional look,
- They feature high magnetic induction at the operating surface, which increases their power,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of detailed creating as well as adapting to complex requirements,
- Wide application in innovative solutions – they are commonly used in HDD drives, drive modules, advanced medical instruments, as well as industrial machines.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Cons
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- Limited possibility of making nuts in the magnet and complicated forms - preferred is casing - mounting mechanism.
- Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Holding force characteristics
Magnetic strength at its maximum – what affects it?
- with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
- with a cross-section minimum 10 mm
- with an ground contact surface
- without any clearance between the magnet and steel
- under axial force direction (90-degree angle)
- at room temperature
Lifting capacity in practice – influencing factors
- Clearance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Steel type – mild steel gives the best results. Alloy steels reduce magnetic properties and holding force.
- Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate reduces the holding force.
Precautions when working with neodymium magnets
Mechanical processing
Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.
Magnetic interference
Be aware: neodymium magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.
Operating temperature
Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.
Electronic devices
Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, timepieces).
Sensitization to coating
Some people suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause a rash. We strongly advise wear safety gloves.
Powerful field
Handle with care. Neodymium magnets act from a long distance and snap with huge force, often faster than you can move away.
Hand protection
Protect your hands. Two large magnets will join immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!
Life threat
Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.
Fragile material
Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them breaking into shards.
Danger to the youngest
Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store away from kids and pets.
