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
bulk discounts:
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Product card - 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 |
Engineering simulation of the product - data
Presented values are the outcome of a physical calculation. Results are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Use these data as a supplementary guide for designers.
Table 1: Static pull force (pull vs gap) - 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
|
weak grip |
| 1 mm |
3615 Gs
361.5 mT
|
0.26 kg / 0.57 pounds
259.0 g / 2.5 N
|
weak grip |
| 2 mm |
2101 Gs
210.1 mT
|
0.09 kg / 0.19 pounds
87.4 g / 0.9 N
|
weak grip |
| 3 mm |
1252 Gs
125.2 mT
|
0.03 kg / 0.07 pounds
31.1 g / 0.3 N
|
weak grip |
| 5 mm |
524 Gs
52.4 mT
|
0.01 kg / 0.01 pounds
5.4 g / 0.1 N
|
weak grip |
| 10 mm |
119 Gs
11.9 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
weak grip |
| 15 mm |
45 Gs
4.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage hold (wall)
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: Vertical assembly (shearing) - 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: Material efficiency (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: Working in heat (stability) - power drop
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 collision
MW 5x7 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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) (implants) - warnings
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 |
| Car key | 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: Collisions (cracking risk) - warning
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: Corrosion resistance
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 (Pc)
MW 5x7 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 219 Mx | 12.2 µWb |
| Pc Coefficient | 1.05 | High (Stable) |
Table 11: Physics of underwater searching
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. Shear force
*Warning: On a vertical surface, the magnet retains just ~20% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.
3. Temperature resistance
*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) = 1.05
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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Strengths and weaknesses of neodymium magnets.
Advantages
- They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
- They retain their magnetic properties even under close interference source,
- By using a shiny coating of silver, the element presents an professional look,
- Magnetic induction on the working layer of the magnet remains impressive,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Thanks to versatility in shaping and the capacity to adapt to specific needs,
- Key role in high-tech industry – they serve a role in magnetic memories, motor assemblies, advanced medical instruments, also modern systems.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Disadvantages
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- 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
- We recommend cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
- Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a block made of structural steel, optimally conducting the magnetic field
- possessing a massiveness of minimum 10 mm to avoid saturation
- characterized by even structure
- with direct contact (without paint)
- during detachment in a direction perpendicular to the mounting surface
- in stable room temperature
Lifting capacity in practice – influencing factors
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
- Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be escaped into the air.
- Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
- Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
- Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.
Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.
Safe handling of NdFeB magnets
Impact on smartphones
GPS units and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.
Material brittleness
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Do not drill into magnets
Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.
Threat to electronics
Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.
Pacemakers
Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Operating temperature
Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.
Do not give to children
Strictly store magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.
Respect the power
Handle with care. Rare earth magnets act from a long distance and connect with massive power, often quicker than you can react.
Crushing risk
Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.
Skin irritation risks
Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, refrain from direct skin contact or select coated magnets.
