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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Physical properties - 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 simulation of the product - data
These values constitute the result of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance may differ. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs gap) - 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 LBS
1700.0 g / 16.7 N
|
safe |
| 1 mm |
2880 Gs
288.0 mT
|
1.02 kg / 2.26 LBS
1023.3 g / 10.0 N
|
safe |
| 2 mm |
2069 Gs
206.9 mT
|
0.53 kg / 1.16 LBS
527.9 g / 5.2 N
|
safe |
| 3 mm |
1439 Gs
143.9 mT
|
0.26 kg / 0.56 LBS
255.3 g / 2.5 N
|
safe |
| 5 mm |
704 Gs
70.4 mT
|
0.06 kg / 0.13 LBS
61.1 g / 0.6 N
|
safe |
| 10 mm |
169 Gs
16.9 mT
|
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
|
safe |
| 15 mm |
62 Gs
6.2 mT
|
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
|
safe |
| 20 mm |
29 Gs
2.9 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
safe |
| 30 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Slippage hold (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 (sliding) - 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 (saturation) - power losses
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) - power drop
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) | Shear Strength (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: Safety (HSE) (implants) - 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 |
| Mechanical watch | 20 Gs (2.0 mT) | 2.5 cm |
| Phone / Smartphone | 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: Collisions (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: Surface protection spec
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. Vertical hold
*Note: On a vertical wall, the magnet holds merely ~20% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Heat tolerance
*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) = 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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Advantages and disadvantages of Nd2Fe14B magnets.
Advantages
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- They have excellent resistance to magnetism drop when exposed to external magnetic sources,
- Thanks to the glossy finish, the coating of nickel, gold, or silver gives an elegant appearance,
- The surface of neodymium magnets generates a concentrated 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 detailed forming and optimizing to concrete conditions,
- Significant place in future technologies – they find application in HDD drives, electric motors, medical equipment, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems
Limitations
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex forms.
- Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Magnetic strength at its maximum – what it depends on?
- on a base made of structural steel, effectively closing the magnetic field
- possessing a thickness of minimum 10 mm to avoid saturation
- with a plane free of scratches
- without the slightest insulating layer between the magnet and steel
- under perpendicular application of breakaway force (90-degree angle)
- at ambient temperature approx. 20 degrees Celsius
What influences lifting capacity in practice
- Gap (betwixt the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
- Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
- Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.
Safe handling of NdFeB magnets
Keep away from computers
Very strong magnetic fields can destroy records on payment cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.
Skin irritation risks
Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands and choose versions in plastic housing.
Protective goggles
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
Fire risk
Dust generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
This is not a toy
These products are not toys. Eating multiple magnets may result in them pinching intestinal walls, which poses a direct threat to life and requires urgent medical intervention.
Do not underestimate power
Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Pinching danger
Large magnets can smash fingers instantly. Do not place your hand betwixt two attracting surfaces.
Implant safety
Patients with a ICD must maintain an safe separation from magnets. The magnetic field can stop the operation of the implant.
Operating temperature
Do not overheat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).
Threat to navigation
A powerful magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.
