MW 8x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010103
GTIN/EAN: 5906301811022
Diameter Ø
8 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.13 g
Magnetization Direction
↑ axial
Load capacity
1.70 kg / 16.67 N
Magnetic Induction
371.53 mT / 3715 Gs
Coating
[NiCuNi] Nickel
0.701 ZŁ with VAT / pcs + price for transport
0.570 ZŁ net + 23% VAT / pcs
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Technical - MW 8x3 / N38 - cylindrical magnet
Specification / characteristics - MW 8x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010103 |
| GTIN/EAN | 5906301811022 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 1.13 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.70 kg / 16.67 N |
| Magnetic Induction ~ ? | 371.53 mT / 3715 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 simulation of the magnet - report
These information are the result of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Actual performance may differ. Use these data as a reference point for designers.
Table 1: Static force (pull vs gap) - interaction chart
MW 8x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3712 Gs
371.2 mT
|
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
|
weak grip |
| 1 mm |
2880 Gs
288.0 mT
|
1.02 kg / 2.26 LBS
1023.3 g / 10.0 N
|
weak grip |
| 2 mm |
2069 Gs
206.9 mT
|
0.53 kg / 1.16 LBS
527.9 g / 5.2 N
|
weak grip |
| 3 mm |
1439 Gs
143.9 mT
|
0.26 kg / 0.56 LBS
255.3 g / 2.5 N
|
weak grip |
| 5 mm |
704 Gs
70.4 mT
|
0.06 kg / 0.13 LBS
61.1 g / 0.6 N
|
weak grip |
| 10 mm |
169 Gs
16.9 mT
|
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
|
weak grip |
| 15 mm |
62 Gs
6.2 mT
|
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
|
weak grip |
| 20 mm |
29 Gs
2.9 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
weak grip |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage load (wall)
MW 8x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
| 1 mm | Stal (~0.2) |
0.20 kg / 0.45 LBS
204.0 g / 2.0 N
|
| 2 mm | Stal (~0.2) |
0.11 kg / 0.23 LBS
106.0 g / 1.0 N
|
| 3 mm | Stal (~0.2) |
0.05 kg / 0.11 LBS
52.0 g / 0.5 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
0.0 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: Vertical assembly (shearing) - vertical pull
MW 8x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.51 kg / 1.12 LBS
510.0 g / 5.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.85 kg / 1.87 LBS
850.0 g / 8.3 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
|
| 1 mm |
|
0.43 kg / 0.94 LBS
425.0 g / 4.2 N
|
| 2 mm |
|
0.85 kg / 1.87 LBS
850.0 g / 8.3 N
|
| 3 mm |
|
1.28 kg / 2.81 LBS
1275.0 g / 12.5 N
|
| 5 mm |
|
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
|
| 10 mm |
|
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
|
| 11 mm |
|
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
|
| 12 mm |
|
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MW 8x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
|
OK |
| 40 °C | -2.2% |
1.66 kg / 3.67 LBS
1662.6 g / 16.3 N
|
OK |
| 60 °C | -4.4% |
1.63 kg / 3.58 LBS
1625.2 g / 15.9 N
|
|
| 80 °C | -6.6% |
1.59 kg / 3.50 LBS
1587.8 g / 15.6 N
|
|
| 100 °C | -28.8% |
1.21 kg / 2.67 LBS
1210.4 g / 11.9 N
|
Table 6: Two magnets (attraction) - field range
MW 8x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.27 kg / 9.42 LBS
5 146 Gs
|
0.64 kg / 1.41 LBS
641 g / 6.3 N
|
N/A |
| 1 mm |
3.40 kg / 7.50 LBS
6 627 Gs
|
0.51 kg / 1.13 LBS
510 g / 5.0 N
|
3.06 kg / 6.75 LBS
~0 Gs
|
| 2 mm |
2.57 kg / 5.67 LBS
5 761 Gs
|
0.39 kg / 0.85 LBS
386 g / 3.8 N
|
2.31 kg / 5.10 LBS
~0 Gs
|
| 3 mm |
1.87 kg / 4.12 LBS
4 914 Gs
|
0.28 kg / 0.62 LBS
281 g / 2.8 N
|
1.68 kg / 3.71 LBS
~0 Gs
|
| 5 mm |
0.93 kg / 2.04 LBS
3 456 Gs
|
0.14 kg / 0.31 LBS
139 g / 1.4 N
|
0.83 kg / 1.84 LBS
~0 Gs
|
| 10 mm |
0.15 kg / 0.34 LBS
1 408 Gs
|
0.02 kg / 0.05 LBS
23 g / 0.2 N
|
0.14 kg / 0.30 LBS
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 LBS
339 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
31 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
19 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
12 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
8 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
6 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
4 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MW 8x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.0 cm |
| Remote | 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: Dynamics (kinetic energy) - warning
MW 8x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
39.17 km/h
(10.88 m/s)
|
0.07 J | |
| 30 mm |
67.75 km/h
(18.82 m/s)
|
0.20 J | |
| 50 mm |
87.47 km/h
(24.30 m/s)
|
0.33 J | |
| 100 mm |
123.70 km/h
(34.36 m/s)
|
0.67 J |
Table 9: Coating parameters (durability)
MW 8x3 / 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 8x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 946 Mx | 19.5 µWb |
| Pc Coefficient | 0.48 | Low (Flat) |
Table 11: Submerged application
MW 8x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.70 kg | Standard |
| Water (riverbed) |
1.95 kg
(+0.25 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.
3. Thermal stability
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Strengths as well as weaknesses of Nd2Fe14B magnets.
Strengths
- Their strength is maintained, and after around 10 years it decreases only by ~1% (theoretically),
- They possess excellent resistance to weakening of magnetic properties as a result of opposing magnetic fields,
- By using a lustrous layer of gold, the element presents an professional look,
- Magnets have impressive magnetic induction on the outer side,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of exact creating as well as optimizing to atypical requirements,
- Key role in modern technologies – they are commonly used in data components, drive modules, diagnostic systems, also modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Cons
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as 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 start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated shapes.
- Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products are able to disrupt the diagnostic process medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Highest magnetic holding force – what contributes to it?
- using a base made of low-carbon steel, acting as a magnetic yoke
- possessing a thickness of min. 10 mm to ensure full flux closure
- characterized by smoothness
- under conditions of ideal adhesion (metal-to-metal)
- during detachment in a direction perpendicular to the plane
- in stable room temperature
Key elements affecting lifting force
- Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Base massiveness – too thin steel does not close the flux, causing part of the flux to be lost to the other side.
- Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
- Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Safe handling of NdFeB magnets
Electronic hazard
Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Powerful field
Handle magnets with awareness. Their huge power can shock even professionals. Plan your moves and respect their power.
Shattering risk
Neodymium magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets leads to them breaking into shards.
Heat sensitivity
Avoid heat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).
Allergic reactions
Certain individuals have a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Prolonged contact can result in a rash. We suggest use safety gloves.
Magnetic interference
Navigation devices and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.
Do not drill into magnets
Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Do not give to children
Absolutely store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.
Pinching danger
Danger of trauma: The pulling power is so great that it can cause hematomas, crushing, and broken bones. Use thick gloves.
Danger to pacemakers
Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.
