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 - 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 assembly - data
The following values are the outcome of a engineering calculation. Results rely on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these data as a preliminary roadmap for designers.
Table 1: Static pull force (pull vs distance) - characteristics
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: Vertical capacity (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 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: 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 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: Material efficiency (saturation) - power losses
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: Working in heat (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 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 (repulsion) - 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: 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 |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Phone / Smartphone | 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: Dynamics (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: 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: Construction 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. Wall mount (shear)
*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Thermal stability
*For N38 grade, the max working temp 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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Pros as well as cons of rare earth magnets.
Pros
- Their strength remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
- They show high resistance to demagnetization induced by external disturbances,
- In other words, due to the metallic finish of gold, the element becomes visually attractive,
- Magnets possess impressive magnetic induction on the active area,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of custom modeling and adjusting to precise requirements,
- Wide application in innovative solutions – they are utilized in data components, motor assemblies, medical equipment, and technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Weaknesses
- At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We suggest cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
- Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can be problematic in diagnostics medical when they are in the body.
- With budget limitations the cost of neodymium magnets is economically unviable,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what it depends on?
- on a plate made of structural steel, optimally conducting the magnetic flux
- with a cross-section of at least 10 mm
- characterized by even structure
- with direct contact (without coatings)
- under axial force direction (90-degree angle)
- at temperature approx. 20 degrees Celsius
Magnet lifting force in use – key factors
- Distance (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Steel thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be escaped to the other side.
- Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
- Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
- Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the holding force.
H&S for magnets
Caution required
Handle with care. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can react.
Compass and GPS
A strong magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets near a device to avoid breaking the sensors.
Machining danger
Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
ICD Warning
Individuals with a pacemaker must keep an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.
Operating temperature
Do not overheat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).
Swallowing risk
Absolutely keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.
Magnet fragility
NdFeB magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets leads to them shattering into shards.
Bone fractures
Large magnets can smash fingers instantly. Never place your hand betwixt two attracting surfaces.
Sensitization to coating
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and wear gloves.
Data carriers
Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.
