MW 5x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010087
GTIN/EAN: 5906301810865
Diameter Ø
5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.44 g
Magnetization Direction
↑ axial
Load capacity
0.84 kg / 8.25 N
Magnetic Induction
475.16 mT / 4752 Gs
Coating
[NiCuNi] Nickel
0.283 ZŁ with VAT / pcs + price for transport
0.230 ZŁ net + 23% VAT / pcs
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Technical specification of the product - MW 5x3 / N38 - cylindrical magnet
Specification / characteristics - MW 5x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010087 |
| GTIN/EAN | 5906301810865 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 5 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 0.44 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.84 kg / 8.25 N |
| Magnetic Induction ~ ? | 475.16 mT / 4752 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 modeling of the assembly - report
Presented information are the direct effect of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Real-world parameters might slightly differ. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs distance) - power drop
MW 5x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4745 Gs
474.5 mT
|
0.84 kg / 1.85 pounds
840.0 g / 8.2 N
|
low risk |
| 1 mm |
2955 Gs
295.5 mT
|
0.33 kg / 0.72 pounds
325.8 g / 3.2 N
|
low risk |
| 2 mm |
1672 Gs
167.2 mT
|
0.10 kg / 0.23 pounds
104.4 g / 1.0 N
|
low risk |
| 3 mm |
960 Gs
96.0 mT
|
0.03 kg / 0.08 pounds
34.4 g / 0.3 N
|
low risk |
| 5 mm |
372 Gs
37.2 mT
|
0.01 kg / 0.01 pounds
5.2 g / 0.1 N
|
low risk |
| 10 mm |
74 Gs
7.4 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
low risk |
| 15 mm |
25 Gs
2.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 20 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 30 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Slippage load (wall)
MW 5x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
168.0 g / 1.6 N
|
| 1 mm | Stal (~0.2) |
0.07 kg / 0.15 pounds
66.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 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 (shearing) - behavior on slippery surfaces
MW 5x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.25 kg / 0.56 pounds
252.0 g / 2.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.17 kg / 0.37 pounds
168.0 g / 1.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.19 pounds
84.0 g / 0.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.42 kg / 0.93 pounds
420.0 g / 4.1 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 5x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.08 kg / 0.19 pounds
84.0 g / 0.8 N
|
| 1 mm |
|
0.21 kg / 0.46 pounds
210.0 g / 2.1 N
|
| 2 mm |
|
0.42 kg / 0.93 pounds
420.0 g / 4.1 N
|
| 3 mm |
|
0.63 kg / 1.39 pounds
630.0 g / 6.2 N
|
| 5 mm |
|
0.84 kg / 1.85 pounds
840.0 g / 8.2 N
|
| 10 mm |
|
0.84 kg / 1.85 pounds
840.0 g / 8.2 N
|
| 11 mm |
|
0.84 kg / 1.85 pounds
840.0 g / 8.2 N
|
| 12 mm |
|
0.84 kg / 1.85 pounds
840.0 g / 8.2 N
|
Table 5: Working in heat (material behavior) - thermal limit
MW 5x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.84 kg / 1.85 pounds
840.0 g / 8.2 N
|
OK |
| 40 °C | -2.2% |
0.82 kg / 1.81 pounds
821.5 g / 8.1 N
|
OK |
| 60 °C | -4.4% |
0.80 kg / 1.77 pounds
803.0 g / 7.9 N
|
OK |
| 80 °C | -6.6% |
0.78 kg / 1.73 pounds
784.6 g / 7.7 N
|
|
| 100 °C | -28.8% |
0.60 kg / 1.32 pounds
598.1 g / 5.9 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 5x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.73 kg / 6.01 pounds
5 700 Gs
|
0.41 kg / 0.90 pounds
409 g / 4.0 N
|
N/A |
| 1 mm |
1.77 kg / 3.91 pounds
7 658 Gs
|
0.27 kg / 0.59 pounds
266 g / 2.6 N
|
1.60 kg / 3.52 pounds
~0 Gs
|
| 2 mm |
1.06 kg / 2.33 pounds
5 910 Gs
|
0.16 kg / 0.35 pounds
159 g / 1.6 N
|
0.95 kg / 2.10 pounds
~0 Gs
|
| 3 mm |
0.60 kg / 1.33 pounds
4 460 Gs
|
0.09 kg / 0.20 pounds
90 g / 0.9 N
|
0.54 kg / 1.19 pounds
~0 Gs
|
| 5 mm |
0.19 kg / 0.42 pounds
2 520 Gs
|
0.03 kg / 0.06 pounds
29 g / 0.3 N
|
0.17 kg / 0.38 pounds
~0 Gs
|
| 10 mm |
0.02 kg / 0.04 pounds
745 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.03 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
147 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 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
|
| 60 mm |
0.00 kg / 0.00 pounds
7 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
5 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
3 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
2 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
2 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MW 5x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Remote | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 5x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
44.07 km/h
(12.24 m/s)
|
0.03 J | |
| 30 mm |
76.32 km/h
(21.20 m/s)
|
0.10 J | |
| 50 mm |
98.53 km/h
(27.37 m/s)
|
0.16 J | |
| 100 mm |
139.35 km/h
(38.71 m/s)
|
0.33 J |
Table 9: Anti-corrosion coating durability
MW 5x3 / 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: Electrical data (Flux)
MW 5x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 942 Mx | 9.4 µWb |
| Pc Coefficient | 0.66 | High (Stable) |
Table 11: Submerged application
MW 5x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.84 kg | Standard |
| Water (riverbed) |
0.96 kg
(+0.12 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical surface, the magnet retains merely a fraction of its nominal pull.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits 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) = 0.66
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.
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 |
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Pros and cons of rare earth magnets.
Advantages
- They do not lose magnetism, even during approximately 10 years – the decrease in strength is only ~1% (theoretically),
- Neodymium magnets are highly resistant to demagnetization caused by external field sources,
- Thanks to the smooth finish, the plating of nickel, gold-plated, or silver-plated gives an professional appearance,
- Magnets are characterized by exceptionally strong magnetic induction on the surface,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- In view of the option of flexible forming and customization to custom requirements, magnetic components can be created in a broad palette of shapes and sizes, which increases their versatility,
- Wide application in high-tech industry – they serve a role in HDD drives, electric motors, medical equipment, as well as complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
- When exposed to high temperature, neodymium magnets experience a drop in force. 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
- They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating nuts and complex shapes in magnets, we propose using casing - magnetic mount.
- Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what affects it?
- with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
- possessing a thickness of min. 10 mm to ensure full flux closure
- characterized by smoothness
- with total lack of distance (without paint)
- for force applied at a right angle (pull-off, not shear)
- at ambient temperature room level
Impact of factors on magnetic holding capacity in practice
- Gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Load vector – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Chemical composition of the base – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and holding force.
- Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
- Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.
H&S for magnets
Danger to pacemakers
People with a pacemaker should maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.
Protect data
Device Safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).
Shattering risk
Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them cracking into small pieces.
Handling guide
Handle magnets with awareness. Their huge power can shock even experienced users. Plan your moves and do not underestimate their power.
Compass and GPS
Remember: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, tablet, and GPS.
Nickel allergy
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation happens, immediately stop handling magnets and use protective gear.
Serious injuries
Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying everything in their path. Be careful!
Product not for children
Absolutely store magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are fatal.
Heat sensitivity
Avoid heat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).
Fire warning
Powder produced during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
