MW 5x25 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010086
GTIN/EAN: 5906301810858
Diameter Ø
5 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
3.68 g
Magnetization Direction
↑ axial
Load capacity
0.45 kg / 4.41 N
Magnetic Induction
615.39 mT / 6154 Gs
Coating
[NiCuNi] Nickel
2.31 ZŁ with VAT / pcs + price for transport
1.880 ZŁ net + 23% VAT / pcs
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Technical data - MW 5x25 / N38 - cylindrical magnet
Specification / characteristics - MW 5x25 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010086 |
| GTIN/EAN | 5906301810858 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 5 mm [±0,1 mm] |
| Height | 25 mm [±0,1 mm] |
| Weight | 3.68 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.45 kg / 4.41 N |
| Magnetic Induction ~ ? | 615.39 mT / 6154 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 product - data
The following information constitute the outcome of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Use these data as a preliminary roadmap for designers.
Table 1: Static pull force (force vs gap) - power drop
MW 5x25 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6144 Gs
614.4 mT
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
weak grip |
| 1 mm |
3869 Gs
386.9 mT
|
0.18 kg / 0.39 LBS
178.4 g / 1.8 N
|
weak grip |
| 2 mm |
2300 Gs
230.0 mT
|
0.06 kg / 0.14 LBS
63.1 g / 0.6 N
|
weak grip |
| 3 mm |
1412 Gs
141.2 mT
|
0.02 kg / 0.05 LBS
23.8 g / 0.2 N
|
weak grip |
| 5 mm |
633 Gs
63.3 mT
|
0.00 kg / 0.01 LBS
4.8 g / 0.0 N
|
weak grip |
| 10 mm |
169 Gs
16.9 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
weak grip |
| 15 mm |
72 Gs
7.2 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
weak grip |
| 20 mm |
38 Gs
3.8 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical force (wall)
MW 5x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| 1 mm | Stal (~0.2) |
0.04 kg / 0.08 LBS
36.0 g / 0.4 N
|
| 2 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
12.0 g / 0.1 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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 (sliding) - behavior on slippery surfaces
MW 5x25 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.14 kg / 0.30 LBS
135.0 g / 1.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.23 kg / 0.50 LBS
225.0 g / 2.2 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 5x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
|
| 1 mm |
|
0.11 kg / 0.25 LBS
112.5 g / 1.1 N
|
| 2 mm |
|
0.23 kg / 0.50 LBS
225.0 g / 2.2 N
|
| 3 mm |
|
0.34 kg / 0.74 LBS
337.5 g / 3.3 N
|
| 5 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
| 10 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
| 11 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
| 12 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
Table 5: Thermal stability (stability) - power drop
MW 5x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
OK |
| 40 °C | -2.2% |
0.44 kg / 0.97 LBS
440.1 g / 4.3 N
|
OK |
| 60 °C | -4.4% |
0.43 kg / 0.95 LBS
430.2 g / 4.2 N
|
OK |
| 80 °C | -6.6% |
0.42 kg / 0.93 LBS
420.3 g / 4.1 N
|
|
| 100 °C | -28.8% |
0.32 kg / 0.71 LBS
320.4 g / 3.1 N
|
Table 6: Two magnets (attraction) - field range
MW 5x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.57 kg / 10.08 LBS
6 167 Gs
|
0.69 kg / 1.51 LBS
686 g / 6.7 N
|
N/A |
| 1 mm |
2.97 kg / 6.55 LBS
9 909 Gs
|
0.45 kg / 0.98 LBS
446 g / 4.4 N
|
2.67 kg / 5.90 LBS
~0 Gs
|
| 2 mm |
1.81 kg / 3.99 LBS
7 738 Gs
|
0.27 kg / 0.60 LBS
272 g / 2.7 N
|
1.63 kg / 3.60 LBS
~0 Gs
|
| 3 mm |
1.08 kg / 2.37 LBS
5 965 Gs
|
0.16 kg / 0.36 LBS
162 g / 1.6 N
|
0.97 kg / 2.14 LBS
~0 Gs
|
| 5 mm |
0.39 kg / 0.86 LBS
3 581 Gs
|
0.06 kg / 0.13 LBS
58 g / 0.6 N
|
0.35 kg / 0.77 LBS
~0 Gs
|
| 10 mm |
0.05 kg / 0.11 LBS
1 266 Gs
|
0.01 kg / 0.02 LBS
7 g / 0.1 N
|
0.04 kg / 0.10 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 LBS
339 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
46 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
30 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
21 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
15 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
11 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
9 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (implants) - warnings
MW 5x25 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (cracking risk) - warning
MW 5x25 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
11.16 km/h
(3.10 m/s)
|
0.02 J | |
| 30 mm |
19.32 km/h
(5.37 m/s)
|
0.05 J | |
| 50 mm |
24.94 km/h
(6.93 m/s)
|
0.09 J | |
| 100 mm |
35.27 km/h
(9.80 m/s)
|
0.18 J |
Table 9: Surface protection spec
MW 5x25 / 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 (Flux)
MW 5x25 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 450 Mx | 14.5 µWb |
| Pc Coefficient | 1.55 | High (Stable) |
Table 11: Submerged application
MW 5x25 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.45 kg | Standard |
| Water (riverbed) |
0.52 kg
(+0.07 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical surface, the magnet holds only a fraction of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) drastically limits the holding force.
3. Temperature resistance
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.55
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also deals
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- They have excellent resistance to weakening of magnetic properties when exposed to external fields,
- By covering with a shiny layer of gold, the element presents an elegant look,
- Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Possibility of custom shaping as well as modifying to defined needs,
- Key role in high-tech industry – they are commonly used in magnetic memories, electric motors, medical equipment, as well as industrial machines.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Weaknesses
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength 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
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- using a base made of high-permeability steel, acting as a ideal flux conductor
- whose thickness equals approx. 10 mm
- characterized by lack of roughness
- with total lack of distance (without impurities)
- for force applied at a right angle (in the magnet axis)
- in neutral thermal conditions
Lifting capacity in real conditions – factors
- Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Material type – the best choice is high-permeability steel. Cast iron may attract less.
- Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
- Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Danger to the youngest
Neodymium magnets are not toys. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.
Threat to navigation
Note: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, device, and navigation systems.
ICD Warning
People with a pacemaker have to keep an large gap from magnets. The magnetic field can stop the operation of the implant.
Dust is flammable
Combustion risk: Rare earth powder is explosive. Avoid machining magnets in home conditions as this risks ignition.
Bone fractures
Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying anything in their path. Be careful!
Permanent damage
Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.
Eye protection
Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Keep away from computers
Powerful magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.
Warning for allergy sufferers
It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for encased magnets.
Handling rules
Be careful. Neodymium magnets act from a long distance and snap with massive power, often faster than you can move away.
