MW 8x20 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010475
GTIN/EAN: 5906301811138
Diameter Ø
8 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
7.54 g
Magnetization Direction
→ diametrical
Load capacity
1.30 kg / 12.71 N
Magnetic Induction
607.01 mT / 6070 Gs
Coating
[NiCuNi] Nickel
4.60 ZŁ with VAT / pcs + price for transport
3.74 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Call us now
+48 22 499 98 98
if you prefer contact us using
form
the contact section.
Weight along with structure of a neodymium magnet can be calculated with our
modular calculator.
Orders placed before 14:00 will be shipped the same business day.
Detailed specification - MW 8x20 / N38 - cylindrical magnet
Specification / characteristics - MW 8x20 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010475 |
| GTIN/EAN | 5906301811138 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 7.54 g |
| Magnetization Direction | → diametrical |
| Load capacity ~ ? | 1.30 kg / 12.71 N |
| Magnetic Induction ~ ? | 607.01 mT / 6070 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 analysis of the product - report
Presented data are the result of a engineering calculation. Results are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these data as a supplementary guide when designing systems.
Table 1: Static pull force (force vs gap) - interaction chart
MW 8x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
6064 Gs
606.4 mT
|
1.30 kg / 1300.0 g
12.8 N
|
low risk |
| 1 mm |
4587 Gs
458.7 mT
|
0.74 kg / 743.7 g
7.3 N
|
low risk |
| 2 mm |
3327 Gs
332.7 mT
|
0.39 kg / 391.4 g
3.8 N
|
low risk |
| 3 mm |
2388 Gs
238.8 mT
|
0.20 kg / 201.6 g
2.0 N
|
low risk |
| 5 mm |
1281 Gs
128.1 mT
|
0.06 kg / 58.0 g
0.6 N
|
low risk |
| 10 mm |
389 Gs
38.9 mT
|
0.01 kg / 5.4 g
0.1 N
|
low risk |
| 15 mm |
169 Gs
16.9 mT
|
0.00 kg / 1.0 g
0.0 N
|
low risk |
| 20 mm |
90 Gs
9.0 mT
|
0.00 kg / 0.3 g
0.0 N
|
low risk |
| 30 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.0 g
0.0 N
|
low risk |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.0 g
0.0 N
|
low risk |
Table 2: Shear force (wall)
MW 8x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.26 kg / 260.0 g
2.6 N
|
| 1 mm | Stal (~0.2) |
0.15 kg / 148.0 g
1.5 N
|
| 2 mm | Stal (~0.2) |
0.08 kg / 78.0 g
0.8 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 40.0 g
0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 12.0 g
0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 8x20 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.39 kg / 390.0 g
3.8 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.26 kg / 260.0 g
2.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.13 kg / 130.0 g
1.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.65 kg / 650.0 g
6.4 N
|
Table 4: Steel thickness (saturation) - power losses
MW 8x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.13 kg / 130.0 g
1.3 N
|
| 1 mm |
|
0.33 kg / 325.0 g
3.2 N
|
| 2 mm |
|
0.65 kg / 650.0 g
6.4 N
|
| 5 mm |
|
1.30 kg / 1300.0 g
12.8 N
|
| 10 mm |
|
1.30 kg / 1300.0 g
12.8 N
|
Table 5: Working in heat (material behavior) - power drop
MW 8x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.30 kg / 1300.0 g
12.8 N
|
OK |
| 40 °C | -2.2% |
1.27 kg / 1271.4 g
12.5 N
|
OK |
| 60 °C | -4.4% |
1.24 kg / 1242.8 g
12.2 N
|
OK |
| 80 °C | -6.6% |
1.21 kg / 1214.2 g
11.9 N
|
|
| 100 °C | -28.8% |
0.93 kg / 925.6 g
9.1 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 8x20 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
11.40 kg / 11396 g
111.8 N
6 154 Gs
|
N/A |
| 1 mm |
8.76 kg / 8758 g
85.9 N
10 632 Gs
|
7.88 kg / 7882 g
77.3 N
~0 Gs
|
| 2 mm |
6.52 kg / 6520 g
64.0 N
9 174 Gs
|
5.87 kg / 5868 g
57.6 N
~0 Gs
|
| 3 mm |
4.76 kg / 4758 g
46.7 N
7 837 Gs
|
4.28 kg / 4282 g
42.0 N
~0 Gs
|
| 5 mm |
2.46 kg / 2461 g
24.1 N
5 637 Gs
|
2.22 kg / 2215 g
21.7 N
~0 Gs
|
| 10 mm |
0.51 kg / 508 g
5.0 N
2 561 Gs
|
0.46 kg / 457 g
4.5 N
~0 Gs
|
| 20 mm |
0.05 kg / 47 g
0.5 N
778 Gs
|
0.04 kg / 42 g
0.4 N
~0 Gs
|
| 50 mm |
0.00 kg / 1 g
0.0 N
107 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
MW 8x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 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 |
| Car key | 50 Gs (5.0 mT) | 3.0 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 (kinetic energy) - collision effects
MW 8x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
13.28 km/h
(3.69 m/s)
|
0.05 J | |
| 30 mm |
22.94 km/h
(6.37 m/s)
|
0.15 J | |
| 50 mm |
29.61 km/h
(8.23 m/s)
|
0.26 J | |
| 100 mm |
41.88 km/h
(11.63 m/s)
|
0.51 J |
Table 9: Corrosion resistance
MW 8x20 / 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: Electrical data (Flux)
MW 8x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 457 Mx | 34.6 µWb |
| Pc Coefficient | 1.31 | High (Stable) |
Table 11: Submerged application
MW 8x20 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.30 kg | Standard |
| Water (riverbed) |
1.49 kg
(+0.19 kg Buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical surface, the magnet holds just ~20% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.
3. Temperature resistance
*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) = 1.31
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.
Material specification
| 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 |
Check out also offers
Pros as well as cons of Nd2Fe14B magnets.
Pros
- Their strength is durable, and after around ten years it drops only by ~1% (according to research),
- They feature excellent resistance to magnetic field loss when exposed to external fields,
- By using a decorative coating of gold, the element presents an elegant look,
- The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of individual creating as well as optimizing to complex needs,
- Wide application in future technologies – they find application in computer drives, motor assemblies, medical equipment, also modern systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems
Cons
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
- Neodymium magnets lose their power 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 durability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- We suggest a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
- Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these products are able to be problematic in diagnostics medical when they are in the body.
- With mass production the cost of neodymium magnets can be a barrier,
Pull force analysis
Maximum magnetic pulling force – what affects it?
- on a base made of mild steel, perfectly concentrating the magnetic flux
- with a thickness minimum 10 mm
- with a surface cleaned and smooth
- under conditions of no distance (metal-to-metal)
- during pulling in a direction perpendicular to the mounting surface
- in neutral thermal conditions
Impact of factors on magnetic holding capacity in practice
- Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
- Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Temperature influence – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
H&S for magnets
ICD Warning
For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.
Dust is flammable
Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.
Power loss in heat
Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.
Powerful field
Handle with care. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can move away.
Magnets are brittle
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Allergy Warning
Studies show that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands or opt for encased magnets.
Crushing risk
Big blocks can crush fingers in a fraction of a second. Under no circumstances put your hand betwixt two strong magnets.
Data carriers
Powerful magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.
No play value
Strictly keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are life-threatening.
GPS and phone interference
An intense magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Keep magnets near a smartphone to avoid damaging the sensors.
Tabela kosztu i czasu dostawy
Płatność przed wysyłką:
GLS kurier
Przesyłka będzie u Ciebie za 2-3 dni
14.99 ZŁ
InPost Paczkomaty 24/7
Przesyłka będzie u Ciebie za 1-2 dni
12.30 ZŁ
Płatność przy odbiorze (pobranie):
GLS kurier
Przesyłka będzie u Ciebie za 1-2 dni
23.00 ZŁ
Rate the product
Your rating