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
Load capacity
2.17 kg / 21.31 N
Magnetic Induction
483.41 mT / 4834 Gs
Coating
[NiCuNi] Nickel
0.836 ZŁ with VAT / pcs + price for transport
0.680 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Call us
+48 22 499 98 98
otherwise send us a note through
request form
the contact section.
Weight and appearance of magnets can be analyzed on our
magnetic calculator.
Orders submitted before 14:00 will be dispatched today!
Technical of the product - 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 |
|---|---|---|
| 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 product - report
These values are the result of a physical calculation. Values are based on models for the material Nd2Fe14B. Operational parameters may differ. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (force vs distance) - interaction chart
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
|
medium risk |
| 1 mm |
3655 Gs
365.5 mT
|
1.24 kg / 2.74 lbs
1242.8 g / 12.2 N
|
low risk |
| 2 mm |
2610 Gs
261.0 mT
|
0.63 kg / 1.40 lbs
633.9 g / 6.2 N
|
low risk |
| 3 mm |
1825 Gs
182.5 mT
|
0.31 kg / 0.68 lbs
310.0 g / 3.0 N
|
low risk |
| 5 mm |
915 Gs
91.5 mT
|
0.08 kg / 0.17 lbs
77.9 g / 0.8 N
|
low risk |
| 10 mm |
234 Gs
23.4 mT
|
0.01 kg / 0.01 lbs
5.1 g / 0.1 N
|
low risk |
| 15 mm |
89 Gs
8.9 mT
|
0.00 kg / 0.00 lbs
0.7 g / 0.0 N
|
low risk |
| 20 mm |
43 Gs
4.3 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
low risk |
| 30 mm |
14 Gs
1.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical 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 (shearing) - vertical pull
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: Steel thickness (saturation) - power losses
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: Working in heat (material behavior) - resistance threshold
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 (attraction) - field range
MW 8x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral 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) - warnings
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 |
| 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: Impact energy (kinetic energy) - collision effects
MW 8x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
34.31 km/h
(9.53 m/s)
|
0.09 J | |
| 30 mm |
59.35 km/h
(16.49 m/s)
|
0.26 J | |
| 50 mm |
76.62 km/h
(21.28 m/s)
|
0.43 J | |
| 100 mm |
108.35 km/h
(30.10 m/s)
|
0.85 J |
Table 9: Corrosion resistance
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: Submerged application
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. Vertical hold
*Note: On a vertical surface, the magnet retains merely a fraction of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely limits the holding force.
3. Power loss vs temp
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.68
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Advantages and disadvantages of rare earth magnets.
Pros
- Their power is durable, and after approximately ten years it decreases only by ~1% (theoretically),
- Magnets effectively defend themselves against demagnetization caused by external fields,
- A magnet with a metallic nickel surface looks better,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to freedom in forming and the capacity to adapt to specific needs,
- Significant place in high-tech industry – they are used in mass storage devices, electric drive systems, medical devices, also technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Disadvantages
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets is economically unviable,
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- on a base made of structural steel, effectively closing the magnetic flux
- with a cross-section minimum 10 mm
- with an polished touching surface
- under conditions of no distance (surface-to-surface)
- under axial application of breakaway force (90-degree angle)
- at conditions approx. 20°C
Determinants of lifting force in real conditions
- Gap (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Angle of force application – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
- Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.
Safety rules for work with neodymium magnets
Physical harm
Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Maximum temperature
Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.
Powerful field
Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.
Allergy Warning
Medical facts indicate that nickel (the usual finish) is a common allergen. If you have an allergy, refrain from direct skin contact and select coated magnets.
Danger to the youngest
Adult use only. Small elements can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.
Safe distance
Device Safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).
Flammability
Machining of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Eye protection
NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them cracking into small pieces.
Impact on smartphones
Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a separation from your phone, device, and GPS.
Warning for heart patients
People with a pacemaker must maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.
