MW 8x5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010105
GTIN/EAN: 5906301811046
- Diameter Ø
- 8 mm [±0,1 mm]
- Height
- 5 mm [±0,1 mm]
- Weight
- 1.88 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
0.680 zł net / pcs
0.836 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.
Call us now
+48 888 99 98 98
alternatively let us know using
contact form
the contact section.
Specifications and structure of a neodymium magnet can be estimated using our
power calculator.
Order by 14:00 and we’ll ship today!
Technical specification - MW 8x5 / N38 - cylindrical magnet
Specification / characteristics - MW 8x5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010105 |
| GTIN/EAN | 5906301811046 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 1.88 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.17 kg / 21.31 N |
| Magnetic Induction ~ ? | 483.41 mT / 4834 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
The following data represent the result of a physical simulation. Results rely on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Use these calculations as a supplementary guide for designers.
Table 1: Static pull force (force vs distance) - characteristics
MW 8x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4830 Gs
483.0 mT
|
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
|
strong |
| 1 mm |
3655 Gs
365.5 mT
|
1.24 kg / 2.74 lbs
1242.8 g / 12.2 N
|
weak grip |
| 2 mm |
2610 Gs
261.0 mT
|
0.63 kg / 1.40 lbs
633.9 g / 6.2 N
|
weak grip |
| 3 mm |
1825 Gs
182.5 mT
|
0.31 kg / 0.68 lbs
310.0 g / 3.0 N
|
weak grip |
| 5 mm |
915 Gs
91.5 mT
|
0.08 kg / 0.17 lbs
77.9 g / 0.8 N
|
weak grip |
| 10 mm |
234 Gs
23.4 mT
|
0.01 kg / 0.01 lbs
5.1 g / 0.1 N
|
weak grip |
| 15 mm |
89 Gs
8.9 mT
|
0.00 kg / 0.00 lbs
0.7 g / 0.0 N
|
weak grip |
| 20 mm |
43 Gs
4.3 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
weak grip |
| 30 mm |
14 Gs
1.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage capacity (vertical surface)
MW 8x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.43 kg / 0.96 lbs
434.0 g / 4.3 N
|
| 1 mm | Stal (~0.2) |
0.25 kg / 0.55 lbs
248.0 g / 2.4 N
|
| 2 mm | Stal (~0.2) |
0.13 kg / 0.28 lbs
126.0 g / 1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.14 lbs
62.0 g / 0.6 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
16.0 g / 0.2 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 (sliding) - behavior on slippery surfaces
MW 8x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.65 kg / 1.44 lbs
651.0 g / 6.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.43 kg / 0.96 lbs
434.0 g / 4.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.22 kg / 0.48 lbs
217.0 g / 2.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.09 kg / 2.39 lbs
1085.0 g / 10.6 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 8x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.22 kg / 0.48 lbs
217.0 g / 2.1 N
|
| 1 mm |
|
0.54 kg / 1.20 lbs
542.5 g / 5.3 N
|
| 2 mm |
|
1.09 kg / 2.39 lbs
1085.0 g / 10.6 N
|
| 3 mm |
|
1.63 kg / 3.59 lbs
1627.5 g / 16.0 N
|
| 5 mm |
|
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
|
| 10 mm |
|
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
|
| 11 mm |
|
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
|
| 12 mm |
|
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
|
Table 5: Thermal resistance (stability) - power drop
MW 8x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
|
OK |
| 40 °C | -2.2% |
2.12 kg / 4.68 lbs
2122.3 g / 20.8 N
|
OK |
| 60 °C | -4.4% |
2.07 kg / 4.57 lbs
2074.5 g / 20.4 N
|
OK |
| 80 °C | -6.6% |
2.03 kg / 4.47 lbs
2026.8 g / 19.9 N
|
|
| 100 °C | -28.8% |
1.55 kg / 3.41 lbs
1545.0 g / 15.2 N
|
Table 6: Two magnets (repulsion) - field range
MW 8x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
7.23 kg / 15.94 lbs
5 742 Gs
|
1.08 kg / 2.39 lbs
1084 g / 10.6 N
|
N/A |
| 1 mm |
5.58 kg / 12.31 lbs
8 490 Gs
|
0.84 kg / 1.85 lbs
838 g / 8.2 N
|
5.03 kg / 11.08 lbs
~0 Gs
|
| 2 mm |
4.14 kg / 9.13 lbs
7 310 Gs
|
0.62 kg / 1.37 lbs
621 g / 6.1 N
|
3.73 kg / 8.21 lbs
~0 Gs
|
| 3 mm |
2.98 kg / 6.58 lbs
6 207 Gs
|
0.45 kg / 0.99 lbs
448 g / 4.4 N
|
2.69 kg / 5.92 lbs
~0 Gs
|
| 5 mm |
1.48 kg / 3.26 lbs
4 369 Gs
|
0.22 kg / 0.49 lbs
222 g / 2.2 N
|
1.33 kg / 2.93 lbs
~0 Gs
|
| 10 mm |
0.26 kg / 0.57 lbs
1 830 Gs
|
0.04 kg / 0.09 lbs
39 g / 0.4 N
|
0.23 kg / 0.51 lbs
~0 Gs
|
| 20 mm |
0.02 kg / 0.04 lbs
468 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.03 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
47 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
29 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
19 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
13 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
9 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
7 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
MW 8x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (cracking risk) - warning
MW 8x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.78 km/h
(6.05 m/s)
|
0.03 J | |
| 30 mm |
21.82 km/h
(6.06 m/s)
|
0.03 J | |
| 50 mm |
21.82 km/h
(6.06 m/s)
|
0.03 J | |
| 100 mm |
21.83 km/h
(6.06 m/s)
|
0.03 J |
Table 9: Coating parameters (durability)
MW 8x5 / 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 8x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 450 Mx | 24.5 µWb |
| Pc Coefficient | 0.68 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 8x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.17 kg | Standard |
| Water (riverbed) |
2.48 kg
(+0.31 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet retains merely a fraction of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Power loss vs temp
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.68
This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Pros as well as cons of Nd2Fe14B magnets.
Advantages
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
- Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
- A magnet with a smooth gold surface is more attractive,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Thanks to modularity in forming and the ability to customize to client solutions,
- Key role in innovative solutions – they serve a role in hard drives, electromotive mechanisms, medical equipment, and multitasking production systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in creating nuts and complex forms in magnets, we propose using casing - magnetic mount.
- Health risk related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
- Due to neodymium price, their price exceeds standard values,
Pull force analysis
Magnetic strength at its maximum – what affects it?
- on a plate made of mild steel, perfectly concentrating the magnetic field
- possessing a thickness of at least 10 mm to ensure full flux closure
- with an ground touching surface
- with direct contact (no paint)
- for force applied at a right angle (in the magnet axis)
- at temperature room level
Impact of factors on magnetic holding capacity in practice
- Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Plate material – mild steel attracts best. Alloy steels reduce magnetic permeability and holding force.
- Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.
H&S for magnets
Handling rules
Exercise caution. Rare earth magnets act from a distance and connect with huge force, often faster than you can move away.
Safe distance
Avoid bringing magnets near a wallet, computer, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.
Magnetic interference
Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.
Keep away from children
NdFeB magnets are not toys. Eating a few magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.
Warning for allergy sufferers
Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease handling magnets and use protective gear.
ICD Warning
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Physical harm
Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Maximum temperature
Do not overheat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).
Dust is flammable
Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Risk of cracking
Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
