MW 5x7 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010090
GTIN/EAN: 5906301810896
Diameter Ø
5 mm [±0,1 mm]
Height
7 mm [±0,1 mm]
Weight
1.03 g
Magnetization Direction
↑ axial
Load capacity
0.67 kg / 6.60 N
Magnetic Induction
582.40 mT / 5824 Gs
Coating
[NiCuNi] Nickel
0.726 ZŁ with VAT / pcs + price for transport
0.590 ZŁ net + 23% VAT / pcs
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Technical specification - MW 5x7 / N38 - cylindrical magnet
Specification / characteristics - MW 5x7 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010090 |
| GTIN/EAN | 5906301810896 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 5 mm [±0,1 mm] |
| Height | 7 mm [±0,1 mm] |
| Weight | 1.03 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.67 kg / 6.60 N |
| Magnetic Induction ~ ? | 582.40 mT / 5824 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 |
Physical simulation of the magnet - report
The following information are the direct effect of a engineering analysis. Results are based on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ. Please consider these data as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - power drop
MW 5x7 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5815 Gs
581.5 mT
|
0.67 kg / 1.48 pounds
670.0 g / 6.6 N
|
low risk |
| 1 mm |
3615 Gs
361.5 mT
|
0.26 kg / 0.57 pounds
259.0 g / 2.5 N
|
low risk |
| 2 mm |
2101 Gs
210.1 mT
|
0.09 kg / 0.19 pounds
87.4 g / 0.9 N
|
low risk |
| 3 mm |
1252 Gs
125.2 mT
|
0.03 kg / 0.07 pounds
31.1 g / 0.3 N
|
low risk |
| 5 mm |
524 Gs
52.4 mT
|
0.01 kg / 0.01 pounds
5.4 g / 0.1 N
|
low risk |
| 10 mm |
119 Gs
11.9 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
low risk |
| 15 mm |
45 Gs
4.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 20 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 30 mm |
7 Gs
0.7 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 load (vertical surface)
MW 5x7 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.13 kg / 0.30 pounds
134.0 g / 1.3 N
|
| 1 mm | Stal (~0.2) |
0.05 kg / 0.11 pounds
52.0 g / 0.5 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
18.0 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: Wall mounting (sliding) - behavior on slippery surfaces
MW 5x7 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.20 kg / 0.44 pounds
201.0 g / 2.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.13 kg / 0.30 pounds
134.0 g / 1.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.15 pounds
67.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.34 kg / 0.74 pounds
335.0 g / 3.3 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 5x7 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.15 pounds
67.0 g / 0.7 N
|
| 1 mm |
|
0.17 kg / 0.37 pounds
167.5 g / 1.6 N
|
| 2 mm |
|
0.34 kg / 0.74 pounds
335.0 g / 3.3 N
|
| 3 mm |
|
0.50 kg / 1.11 pounds
502.5 g / 4.9 N
|
| 5 mm |
|
0.67 kg / 1.48 pounds
670.0 g / 6.6 N
|
| 10 mm |
|
0.67 kg / 1.48 pounds
670.0 g / 6.6 N
|
| 11 mm |
|
0.67 kg / 1.48 pounds
670.0 g / 6.6 N
|
| 12 mm |
|
0.67 kg / 1.48 pounds
670.0 g / 6.6 N
|
Table 5: Thermal stability (stability) - thermal limit
MW 5x7 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.67 kg / 1.48 pounds
670.0 g / 6.6 N
|
OK |
| 40 °C | -2.2% |
0.66 kg / 1.44 pounds
655.3 g / 6.4 N
|
OK |
| 60 °C | -4.4% |
0.64 kg / 1.41 pounds
640.5 g / 6.3 N
|
OK |
| 80 °C | -6.6% |
0.63 kg / 1.38 pounds
625.8 g / 6.1 N
|
|
| 100 °C | -28.8% |
0.48 kg / 1.05 pounds
477.0 g / 4.7 N
|
Table 6: Two magnets (attraction) - field range
MW 5x7 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.09 kg / 9.02 pounds
6 079 Gs
|
0.61 kg / 1.35 pounds
614 g / 6.0 N
|
N/A |
| 1 mm |
2.64 kg / 5.81 pounds
9 332 Gs
|
0.40 kg / 0.87 pounds
395 g / 3.9 N
|
2.37 kg / 5.23 pounds
~0 Gs
|
| 2 mm |
1.58 kg / 3.49 pounds
7 230 Gs
|
0.24 kg / 0.52 pounds
237 g / 2.3 N
|
1.42 kg / 3.14 pounds
~0 Gs
|
| 3 mm |
0.92 kg / 2.03 pounds
5 516 Gs
|
0.14 kg / 0.30 pounds
138 g / 1.4 N
|
0.83 kg / 1.83 pounds
~0 Gs
|
| 5 mm |
0.31 kg / 0.69 pounds
3 224 Gs
|
0.05 kg / 0.10 pounds
47 g / 0.5 N
|
0.28 kg / 0.62 pounds
~0 Gs
|
| 10 mm |
0.03 kg / 0.07 pounds
1 048 Gs
|
0.00 kg / 0.01 pounds
5 g / 0.0 N
|
0.03 kg / 0.07 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
238 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
24 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
15 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
10 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
7 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
5 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: Safety (HSE) (electronics) - precautionary measures
MW 5x7 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Remote | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 5x7 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
25.73 km/h
(7.15 m/s)
|
0.03 J | |
| 30 mm |
44.55 km/h
(12.38 m/s)
|
0.08 J | |
| 50 mm |
57.52 km/h
(15.98 m/s)
|
0.13 J | |
| 100 mm |
81.34 km/h
(22.59 m/s)
|
0.26 J |
Table 9: Coating parameters (durability)
MW 5x7 / 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 5x7 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 219 Mx | 12.2 µWb |
| Pc Coefficient | 1.05 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 5x7 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.67 kg | Standard |
| Water (riverbed) |
0.77 kg
(+0.10 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet retains just approx. 20-30% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Heat tolerance
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.05
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.
Chemical composition
| 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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths and weaknesses of neodymium magnets.
Strengths
- Their power remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
- Magnets very well protect themselves against loss of magnetization caused by ambient magnetic noise,
- A magnet with a shiny silver surface has better aesthetics,
- Magnets exhibit extremely high magnetic induction on the working surface,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to versatility in shaping and the ability to customize to unusual requirements,
- Huge importance in modern industrial fields – they are used in magnetic memories, electric drive systems, precision medical tools, as well as modern systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
- Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic holder.
- Health risk to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these magnets can be problematic in diagnostics medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum lifting force for a neodymium magnet – what it depends on?
- with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
- possessing a massiveness of min. 10 mm to avoid saturation
- with a plane cleaned and smooth
- without the slightest air gap between the magnet and steel
- under axial application of breakaway force (90-degree angle)
- at ambient temperature room level
Lifting capacity in practice – influencing factors
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Metal type – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
- Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
H&S for magnets
Fire warning
Powder created during machining of magnets is flammable. Do not drill into magnets unless you are an expert.
Heat warning
Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.
Do not underestimate power
Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.
Keep away from computers
Do not bring magnets near a purse, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.
Magnetic interference
A powerful magnetic field negatively affects the functioning of magnetometers in smartphones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.
Medical interference
Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Product not for children
Product intended for adults. Small elements can be swallowed, causing serious injuries. Store away from kids and pets.
Bone fractures
Big blocks can smash fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.
Nickel allergy
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop working with magnets and wear gloves.
Eye protection
Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them cracking into small pieces.
