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 parameters of the product - 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 |
Technical analysis of the magnet - report
Presented data are the direct effect of a mathematical simulation. Values are based on algorithms for the material Nd2Fe14B. Operational parameters may differ. Please consider these data as a reference point for designers.
Table 1: Static pull force (pull vs gap) - interaction chart
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 LBS
670.0 g / 6.6 N
|
safe |
| 1 mm |
3615 Gs
361.5 mT
|
0.26 kg / 0.57 LBS
259.0 g / 2.5 N
|
safe |
| 2 mm |
2101 Gs
210.1 mT
|
0.09 kg / 0.19 LBS
87.4 g / 0.9 N
|
safe |
| 3 mm |
1252 Gs
125.2 mT
|
0.03 kg / 0.07 LBS
31.1 g / 0.3 N
|
safe |
| 5 mm |
524 Gs
52.4 mT
|
0.01 kg / 0.01 LBS
5.4 g / 0.1 N
|
safe |
| 10 mm |
119 Gs
11.9 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
safe |
| 15 mm |
45 Gs
4.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 20 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 30 mm |
7 Gs
0.7 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 5x7 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.13 kg / 0.30 LBS
134.0 g / 1.3 N
|
| 1 mm | Stal (~0.2) |
0.05 kg / 0.11 LBS
52.0 g / 0.5 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
18.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.01 LBS
6.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 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: Wall mounting (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 LBS
201.0 g / 2.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.13 kg / 0.30 LBS
134.0 g / 1.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.15 LBS
67.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.34 kg / 0.74 LBS
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 LBS
67.0 g / 0.7 N
|
| 1 mm |
|
0.17 kg / 0.37 LBS
167.5 g / 1.6 N
|
| 2 mm |
|
0.34 kg / 0.74 LBS
335.0 g / 3.3 N
|
| 3 mm |
|
0.50 kg / 1.11 LBS
502.5 g / 4.9 N
|
| 5 mm |
|
0.67 kg / 1.48 LBS
670.0 g / 6.6 N
|
| 10 mm |
|
0.67 kg / 1.48 LBS
670.0 g / 6.6 N
|
| 11 mm |
|
0.67 kg / 1.48 LBS
670.0 g / 6.6 N
|
| 12 mm |
|
0.67 kg / 1.48 LBS
670.0 g / 6.6 N
|
Table 5: Thermal resistance (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 LBS
670.0 g / 6.6 N
|
OK |
| 40 °C | -2.2% |
0.66 kg / 1.44 LBS
655.3 g / 6.4 N
|
OK |
| 60 °C | -4.4% |
0.64 kg / 1.41 LBS
640.5 g / 6.3 N
|
OK |
| 80 °C | -6.6% |
0.63 kg / 1.38 LBS
625.8 g / 6.1 N
|
|
| 100 °C | -28.8% |
0.48 kg / 1.05 LBS
477.0 g / 4.7 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
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 LBS
6 079 Gs
|
0.61 kg / 1.35 LBS
614 g / 6.0 N
|
N/A |
| 1 mm |
2.64 kg / 5.81 LBS
9 332 Gs
|
0.40 kg / 0.87 LBS
395 g / 3.9 N
|
2.37 kg / 5.23 LBS
~0 Gs
|
| 2 mm |
1.58 kg / 3.49 LBS
7 230 Gs
|
0.24 kg / 0.52 LBS
237 g / 2.3 N
|
1.42 kg / 3.14 LBS
~0 Gs
|
| 3 mm |
0.92 kg / 2.03 LBS
5 516 Gs
|
0.14 kg / 0.30 LBS
138 g / 1.4 N
|
0.83 kg / 1.83 LBS
~0 Gs
|
| 5 mm |
0.31 kg / 0.69 LBS
3 224 Gs
|
0.05 kg / 0.10 LBS
47 g / 0.5 N
|
0.28 kg / 0.62 LBS
~0 Gs
|
| 10 mm |
0.03 kg / 0.07 LBS
1 048 Gs
|
0.00 kg / 0.01 LBS
5 g / 0.0 N
|
0.03 kg / 0.07 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
238 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
24 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
15 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
10 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
7 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
5 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: Protective zones (implants) - 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 |
| 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: Impact energy (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: Surface protection spec
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: Submerged application
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. Sliding resistance
*Caution: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) drastically reduces the holding force.
3. Heat tolerance
*For N38 material, 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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages as well as disadvantages of neodymium magnets.
Advantages
- They do not lose magnetism, even over around ten years – the reduction in power is only ~1% (theoretically),
- They are resistant to demagnetization induced by external field influence,
- Thanks to the elegant finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
- They show high magnetic induction at the operating surface, which increases their power,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
- Thanks to freedom in forming and the capacity to modify to complex applications,
- Fundamental importance in electronics industry – they are used in mass storage devices, brushless drives, precision medical tools, also other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems
Disadvantages
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complex forms.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these products can be problematic in diagnostics medical after entering the body.
- Due to neodymium price, their price exceeds standard values,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- on a plate made of mild steel, perfectly concentrating the magnetic flux
- with a thickness no less than 10 mm
- with an ideally smooth contact surface
- with direct contact (without impurities)
- during pulling in a direction perpendicular to the mounting surface
- at temperature approx. 20 degrees Celsius
Practical aspects of lifting capacity – factors
- Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Plate thickness – too thin plate does not close the flux, causing part of the power to be lost to the other side.
- Plate material – mild steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
- Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.
Safety rules for work with NdFeB magnets
Compass and GPS
Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.
Magnet fragility
Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
Respect the power
Handle with care. Neodymium magnets act from a long distance and snap with massive power, often quicker than you can react.
Sensitization to coating
Allergy Notice: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, cease working with magnets and use protective gear.
Thermal limits
Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.
Machining danger
Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
Hand protection
Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Product not for children
Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Store out of reach of children and animals.
Data carriers
Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
Warning for heart patients
People with a heart stimulator must maintain an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.
