MW 40x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010066
GTIN/EAN: 5906301810650
Diameter Ø
40 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
94.25 g
Magnetization Direction
↑ axial
Load capacity
27.73 kg / 271.99 N
Magnetic Induction
277.22 mT / 2772 Gs
Coating
[NiCuNi] Nickel
36.57 ZŁ with VAT / pcs + price for transport
29.73 ZŁ net + 23% VAT / pcs
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Technical details - MW 40x10 / N38 - cylindrical magnet
Specification / characteristics - MW 40x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010066 |
| GTIN/EAN | 5906301810650 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 40 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 94.25 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 27.73 kg / 271.99 N |
| Magnetic Induction ~ ? | 277.22 mT / 2772 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 analysis of the magnet - technical parameters
The following values are the result of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Operational parameters may differ. Use these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs gap) - power drop
MW 40x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2772 Gs
277.2 mT
|
27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
|
crushing |
| 1 mm |
2678 Gs
267.8 mT
|
25.89 kg / 57.08 lbs
25889.6 g / 254.0 N
|
crushing |
| 2 mm |
2573 Gs
257.3 mT
|
23.89 kg / 52.68 lbs
23893.3 g / 234.4 N
|
crushing |
| 3 mm |
2459 Gs
245.9 mT
|
21.83 kg / 48.12 lbs
21827.6 g / 214.1 N
|
crushing |
| 5 mm |
2216 Gs
221.6 mT
|
17.73 kg / 39.08 lbs
17728.1 g / 173.9 N
|
crushing |
| 10 mm |
1611 Gs
161.1 mT
|
9.37 kg / 20.66 lbs
9371.0 g / 91.9 N
|
medium risk |
| 15 mm |
1121 Gs
112.1 mT
|
4.54 kg / 10.01 lbs
4538.6 g / 44.5 N
|
medium risk |
| 20 mm |
775 Gs
77.5 mT
|
2.17 kg / 4.77 lbs
2165.8 g / 21.2 N
|
medium risk |
| 30 mm |
387 Gs
38.7 mT
|
0.54 kg / 1.19 lbs
539.8 g / 5.3 N
|
weak grip |
| 50 mm |
125 Gs
12.5 mT
|
0.06 kg / 0.12 lbs
56.6 g / 0.6 N
|
weak grip |
Table 2: Vertical load (wall)
MW 40x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
5.55 kg / 12.23 lbs
5546.0 g / 54.4 N
|
| 1 mm | Stal (~0.2) |
5.18 kg / 11.42 lbs
5178.0 g / 50.8 N
|
| 2 mm | Stal (~0.2) |
4.78 kg / 10.53 lbs
4778.0 g / 46.9 N
|
| 3 mm | Stal (~0.2) |
4.37 kg / 9.63 lbs
4366.0 g / 42.8 N
|
| 5 mm | Stal (~0.2) |
3.55 kg / 7.82 lbs
3546.0 g / 34.8 N
|
| 10 mm | Stal (~0.2) |
1.87 kg / 4.13 lbs
1874.0 g / 18.4 N
|
| 15 mm | Stal (~0.2) |
0.91 kg / 2.00 lbs
908.0 g / 8.9 N
|
| 20 mm | Stal (~0.2) |
0.43 kg / 0.96 lbs
434.0 g / 4.3 N
|
| 30 mm | Stal (~0.2) |
0.11 kg / 0.24 lbs
108.0 g / 1.1 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 40x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
8.32 kg / 18.34 lbs
8319.0 g / 81.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
5.55 kg / 12.23 lbs
5546.0 g / 54.4 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.77 kg / 6.11 lbs
2773.0 g / 27.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
13.87 kg / 30.57 lbs
13865.0 g / 136.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 40x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.39 kg / 3.06 lbs
1386.5 g / 13.6 N
|
| 1 mm |
|
3.47 kg / 7.64 lbs
3466.3 g / 34.0 N
|
| 2 mm |
|
6.93 kg / 15.28 lbs
6932.5 g / 68.0 N
|
| 3 mm |
|
10.40 kg / 22.93 lbs
10398.8 g / 102.0 N
|
| 5 mm |
|
17.33 kg / 38.21 lbs
17331.3 g / 170.0 N
|
| 10 mm |
|
27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
|
| 11 mm |
|
27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
|
| 12 mm |
|
27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
|
Table 5: Thermal stability (stability) - thermal limit
MW 40x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
|
OK |
| 40 °C | -2.2% |
27.12 kg / 59.79 lbs
27119.9 g / 266.0 N
|
OK |
| 60 °C | -4.4% |
26.51 kg / 58.44 lbs
26509.9 g / 260.1 N
|
|
| 80 °C | -6.6% |
25.90 kg / 57.10 lbs
25899.8 g / 254.1 N
|
|
| 100 °C | -28.8% |
19.74 kg / 43.53 lbs
19743.8 g / 193.7 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 40x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
59.52 kg / 131.22 lbs
4 382 Gs
|
8.93 kg / 19.68 lbs
8928 g / 87.6 N
|
N/A |
| 1 mm |
57.61 kg / 127.01 lbs
5 454 Gs
|
8.64 kg / 19.05 lbs
8642 g / 84.8 N
|
51.85 kg / 114.31 lbs
~0 Gs
|
| 2 mm |
55.57 kg / 122.52 lbs
5 357 Gs
|
8.34 kg / 18.38 lbs
8336 g / 81.8 N
|
50.01 kg / 110.26 lbs
~0 Gs
|
| 3 mm |
53.46 kg / 117.85 lbs
5 254 Gs
|
8.02 kg / 17.68 lbs
8019 g / 78.7 N
|
48.11 kg / 106.07 lbs
~0 Gs
|
| 5 mm |
49.08 kg / 108.20 lbs
5 034 Gs
|
7.36 kg / 16.23 lbs
7362 g / 72.2 N
|
44.17 kg / 97.38 lbs
~0 Gs
|
| 10 mm |
38.05 kg / 83.89 lbs
4 433 Gs
|
5.71 kg / 12.58 lbs
5708 g / 56.0 N
|
34.25 kg / 75.50 lbs
~0 Gs
|
| 20 mm |
20.11 kg / 44.35 lbs
3 223 Gs
|
3.02 kg / 6.65 lbs
3017 g / 29.6 N
|
18.10 kg / 39.91 lbs
~0 Gs
|
| 50 mm |
2.27 kg / 5.01 lbs
1 083 Gs
|
0.34 kg / 0.75 lbs
341 g / 3.3 N
|
2.05 kg / 4.51 lbs
~0 Gs
|
| 60 mm |
1.16 kg / 2.55 lbs
773 Gs
|
0.17 kg / 0.38 lbs
174 g / 1.7 N
|
1.04 kg / 2.30 lbs
~0 Gs
|
| 70 mm |
0.62 kg / 1.36 lbs
565 Gs
|
0.09 kg / 0.20 lbs
93 g / 0.9 N
|
0.56 kg / 1.23 lbs
~0 Gs
|
| 80 mm |
0.35 kg / 0.76 lbs
422 Gs
|
0.05 kg / 0.11 lbs
52 g / 0.5 N
|
0.31 kg / 0.69 lbs
~0 Gs
|
| 90 mm |
0.20 kg / 0.44 lbs
322 Gs
|
0.03 kg / 0.07 lbs
30 g / 0.3 N
|
0.18 kg / 0.40 lbs
~0 Gs
|
| 100 mm |
0.12 kg / 0.27 lbs
251 Gs
|
0.02 kg / 0.04 lbs
18 g / 0.2 N
|
0.11 kg / 0.24 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
MW 40x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 16.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 13.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 10.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 8.0 cm |
| Car key | 50 Gs (5.0 mT) | 7.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Collisions (cracking risk) - warning
MW 40x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.63 km/h
(5.73 m/s)
|
1.55 J | |
| 30 mm |
30.32 km/h
(8.42 m/s)
|
3.34 J | |
| 50 mm |
38.73 km/h
(10.76 m/s)
|
5.45 J | |
| 100 mm |
54.71 km/h
(15.20 m/s)
|
10.88 J |
Table 9: Corrosion resistance
MW 40x10 / 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 40x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 38 700 Mx | 387.0 µWb |
| Pc Coefficient | 0.35 | Low (Flat) |
Table 11: Submerged application
MW 40x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 27.73 kg | Standard |
| Water (riverbed) |
31.75 kg
(+4.02 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically 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) = 0.35
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.
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 |
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Pros and cons of neodymium magnets.
Advantages
- They do not lose power, even over nearly 10 years – the drop in strength is only ~1% (theoretically),
- Neodymium magnets are distinguished by remarkably resistant to magnetic field loss caused by external magnetic fields,
- The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to look better,
- They feature high magnetic induction at the operating surface, which affects their effectiveness,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of detailed shaping as well as adjusting to complex requirements,
- Key role in advanced technology sectors – they serve a role in hard drives, electromotive mechanisms, precision medical tools, and modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in creating threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
- Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these magnets can be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Best holding force of the magnet in ideal parameters – what affects it?
- on a base made of structural steel, effectively closing the magnetic field
- whose transverse dimension reaches at least 10 mm
- characterized by smoothness
- with total lack of distance (no coatings)
- for force acting at a right angle (in the magnet axis)
- at conditions approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Plate material – mild steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
- Plate texture – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
- Temperature – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.
Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.
Precautions when working with NdFeB magnets
Magnetic media
Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).
Bodily injuries
Pinching hazard: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Magnetic interference
GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Allergic reactions
Medical facts indicate that nickel (the usual finish) is a potent allergen. For allergy sufferers, avoid direct skin contact or select versions in plastic housing.
Powerful field
Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.
Choking Hazard
Always keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.
Operating temperature
Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).
Protective goggles
Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Danger to pacemakers
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Machining danger
Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.
