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 |
Engineering analysis of the assembly - data
The following values constitute the outcome of a mathematical analysis. Values rely on models for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Use these data as a supplementary guide for designers.
Table 1: Static force (pull vs distance) - power drop
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 pounds
1700.0 g / 16.7 N
|
low risk |
| 1 mm |
2880 Gs
288.0 mT
|
1.02 kg / 2.26 pounds
1023.3 g / 10.0 N
|
low risk |
| 2 mm |
2069 Gs
206.9 mT
|
0.53 kg / 1.16 pounds
527.9 g / 5.2 N
|
low risk |
| 3 mm |
1439 Gs
143.9 mT
|
0.26 kg / 0.56 pounds
255.3 g / 2.5 N
|
low risk |
| 5 mm |
704 Gs
70.4 mT
|
0.06 kg / 0.13 pounds
61.1 g / 0.6 N
|
low risk |
| 10 mm |
169 Gs
16.9 mT
|
0.00 kg / 0.01 pounds
3.5 g / 0.0 N
|
low risk |
| 15 mm |
62 Gs
6.2 mT
|
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
|
low risk |
| 20 mm |
29 Gs
2.9 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Slippage force (wall)
MW 8x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
| 1 mm | Stal (~0.2) |
0.20 kg / 0.45 pounds
204.0 g / 2.0 N
|
| 2 mm | Stal (~0.2) |
0.11 kg / 0.23 pounds
106.0 g / 1.0 N
|
| 3 mm | Stal (~0.2) |
0.05 kg / 0.11 pounds
52.0 g / 0.5 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
0.0 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: Vertical assembly (sliding) - behavior on slippery surfaces
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 pounds
510.0 g / 5.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.85 kg / 1.87 pounds
850.0 g / 8.3 N
|
Table 4: Steel thickness (saturation) - 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 pounds
170.0 g / 1.7 N
|
| 1 mm |
|
0.43 kg / 0.94 pounds
425.0 g / 4.2 N
|
| 2 mm |
|
0.85 kg / 1.87 pounds
850.0 g / 8.3 N
|
| 3 mm |
|
1.28 kg / 2.81 pounds
1275.0 g / 12.5 N
|
| 5 mm |
|
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
|
| 10 mm |
|
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
|
| 11 mm |
|
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
|
| 12 mm |
|
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
|
Table 5: Thermal stability (stability) - thermal limit
MW 8x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
|
OK |
| 40 °C | -2.2% |
1.66 kg / 3.67 pounds
1662.6 g / 16.3 N
|
OK |
| 60 °C | -4.4% |
1.63 kg / 3.58 pounds
1625.2 g / 15.9 N
|
|
| 80 °C | -6.6% |
1.59 kg / 3.50 pounds
1587.8 g / 15.6 N
|
|
| 100 °C | -28.8% |
1.21 kg / 2.67 pounds
1210.4 g / 11.9 N
|
Table 6: Two magnets (attraction) - field collision
MW 8x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.27 kg / 9.42 pounds
5 146 Gs
|
0.64 kg / 1.41 pounds
641 g / 6.3 N
|
N/A |
| 1 mm |
3.40 kg / 7.50 pounds
6 627 Gs
|
0.51 kg / 1.13 pounds
510 g / 5.0 N
|
3.06 kg / 6.75 pounds
~0 Gs
|
| 2 mm |
2.57 kg / 5.67 pounds
5 761 Gs
|
0.39 kg / 0.85 pounds
386 g / 3.8 N
|
2.31 kg / 5.10 pounds
~0 Gs
|
| 3 mm |
1.87 kg / 4.12 pounds
4 914 Gs
|
0.28 kg / 0.62 pounds
281 g / 2.8 N
|
1.68 kg / 3.71 pounds
~0 Gs
|
| 5 mm |
0.93 kg / 2.04 pounds
3 456 Gs
|
0.14 kg / 0.31 pounds
139 g / 1.4 N
|
0.83 kg / 1.84 pounds
~0 Gs
|
| 10 mm |
0.15 kg / 0.34 pounds
1 408 Gs
|
0.02 kg / 0.05 pounds
23 g / 0.2 N
|
0.14 kg / 0.30 pounds
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 pounds
339 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
31 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
19 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
12 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
8 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
6 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
4 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (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 |
| Mobile device | 40 Gs (4.0 mT) | 2.0 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 (kinetic energy) - collision effects
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 (Flux)
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. Shear force
*Warning: On a vertical wall, the magnet retains only ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*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
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages and disadvantages of neodymium magnets.
Benefits
- They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
- They do not lose their magnetic properties even under strong external field,
- Thanks to the shiny finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
- The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Considering the ability of free shaping and customization to unique needs, NdFeB magnets can be created in a wide range of geometric configurations, which increases their versatility,
- Key role in electronics industry – they are used in mass storage devices, drive modules, medical devices, also modern systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- 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.
- 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, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in producing nuts and complex forms in magnets, we propose using casing - magnetic holder.
- Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small components of these magnets are able to complicate diagnosis medical after entering the body.
- Due to complex production process, their price exceeds standard values,
Lifting parameters
Maximum lifting capacity of the magnet – what contributes to it?
- with the application of a sheet made of special test steel, ensuring full magnetic saturation
- with a thickness no less than 10 mm
- with an polished contact surface
- without the slightest clearance between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- at temperature room level
Practical aspects of lifting capacity – factors
- Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
- Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the load capacity.
Precautions when working with neodymium magnets
Implant safety
Medical warning: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.
Dust explosion hazard
Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Cards and drives
Very strong magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.
This is not a toy
Strictly store magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are very dangerous.
Eye protection
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.
Heat sensitivity
Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.
Warning for allergy sufferers
Certain individuals suffer from a sensitization to Ni, which is the typical protective layer for neodymium magnets. Frequent touching can result in a rash. We suggest wear protective gloves.
Finger safety
Large magnets can smash fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.
Phone sensors
Be aware: rare earth magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, tablet, and navigation systems.
Powerful field
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
