MW 40x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010067
GTIN/EAN: 5906301810667
Diameter Ø
40 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
141.37 g
Magnetization Direction
↑ axial
Load capacity
42.64 kg / 418.33 N
Magnetic Induction
371.91 mT / 3719 Gs
Coating
[NiCuNi] Nickel
65.93 ZŁ with VAT / pcs + price for transport
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Technical specification - MW 40x15 / N38 - cylindrical magnet
Specification / characteristics - MW 40x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010067 |
| GTIN/EAN | 5906301810667 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 40 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 141.37 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 42.64 kg / 418.33 N |
| Magnetic Induction ~ ? | 371.91 mT / 3719 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 modeling of the product - technical parameters
These information represent the direct effect of a physical calculation. Values are based on models for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Treat these data as a reference point for designers.
Table 1: Static force (force vs distance) - power drop
MW 40x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3718 Gs
371.8 mT
|
42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
|
crushing |
| 1 mm |
3563 Gs
356.3 mT
|
39.16 kg / 86.33 LBS
39159.5 g / 384.2 N
|
crushing |
| 2 mm |
3398 Gs
339.8 mT
|
35.62 kg / 78.52 LBS
35617.1 g / 349.4 N
|
crushing |
| 3 mm |
3228 Gs
322.8 mT
|
32.13 kg / 70.84 LBS
32130.5 g / 315.2 N
|
crushing |
| 5 mm |
2880 Gs
288.0 mT
|
25.58 kg / 56.40 LBS
25584.2 g / 251.0 N
|
crushing |
| 10 mm |
2069 Gs
206.9 mT
|
13.20 kg / 29.09 LBS
13196.7 g / 129.5 N
|
crushing |
| 15 mm |
1439 Gs
143.9 mT
|
6.38 kg / 14.07 LBS
6383.1 g / 62.6 N
|
medium risk |
| 20 mm |
999 Gs
99.9 mT
|
3.08 kg / 6.79 LBS
3077.9 g / 30.2 N
|
medium risk |
| 30 mm |
507 Gs
50.7 mT
|
0.79 kg / 1.75 LBS
792.4 g / 7.8 N
|
weak grip |
| 50 mm |
169 Gs
16.9 mT
|
0.09 kg / 0.19 LBS
88.4 g / 0.9 N
|
weak grip |
Table 2: Slippage load (wall)
MW 40x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.53 kg / 18.80 LBS
8528.0 g / 83.7 N
|
| 1 mm | Stal (~0.2) |
7.83 kg / 17.27 LBS
7832.0 g / 76.8 N
|
| 2 mm | Stal (~0.2) |
7.12 kg / 15.71 LBS
7124.0 g / 69.9 N
|
| 3 mm | Stal (~0.2) |
6.43 kg / 14.17 LBS
6426.0 g / 63.0 N
|
| 5 mm | Stal (~0.2) |
5.12 kg / 11.28 LBS
5116.0 g / 50.2 N
|
| 10 mm | Stal (~0.2) |
2.64 kg / 5.82 LBS
2640.0 g / 25.9 N
|
| 15 mm | Stal (~0.2) |
1.28 kg / 2.81 LBS
1276.0 g / 12.5 N
|
| 20 mm | Stal (~0.2) |
0.62 kg / 1.36 LBS
616.0 g / 6.0 N
|
| 30 mm | Stal (~0.2) |
0.16 kg / 0.35 LBS
158.0 g / 1.5 N
|
| 50 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
18.0 g / 0.2 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 40x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
12.79 kg / 28.20 LBS
12792.0 g / 125.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.53 kg / 18.80 LBS
8528.0 g / 83.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.26 kg / 9.40 LBS
4264.0 g / 41.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
21.32 kg / 47.00 LBS
21320.0 g / 209.1 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 40x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.13 kg / 4.70 LBS
2132.0 g / 20.9 N
|
| 1 mm |
|
5.33 kg / 11.75 LBS
5330.0 g / 52.3 N
|
| 2 mm |
|
10.66 kg / 23.50 LBS
10660.0 g / 104.6 N
|
| 3 mm |
|
15.99 kg / 35.25 LBS
15990.0 g / 156.9 N
|
| 5 mm |
|
26.65 kg / 58.75 LBS
26650.0 g / 261.4 N
|
| 10 mm |
|
42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
|
| 11 mm |
|
42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
|
| 12 mm |
|
42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MW 40x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
|
OK |
| 40 °C | -2.2% |
41.70 kg / 91.94 LBS
41701.9 g / 409.1 N
|
OK |
| 60 °C | -4.4% |
40.76 kg / 89.87 LBS
40763.8 g / 399.9 N
|
|
| 80 °C | -6.6% |
39.83 kg / 87.80 LBS
39825.8 g / 390.7 N
|
|
| 100 °C | -28.8% |
30.36 kg / 66.93 LBS
30359.7 g / 297.8 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 40x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
107.12 kg / 236.16 LBS
5 156 Gs
|
16.07 kg / 35.42 LBS
16068 g / 157.6 N
|
N/A |
| 1 mm |
102.82 kg / 226.67 LBS
7 286 Gs
|
15.42 kg / 34.00 LBS
15422 g / 151.3 N
|
92.53 kg / 204.00 LBS
~0 Gs
|
| 2 mm |
98.38 kg / 216.89 LBS
7 127 Gs
|
14.76 kg / 32.53 LBS
14757 g / 144.8 N
|
88.54 kg / 195.20 LBS
~0 Gs
|
| 3 mm |
93.92 kg / 207.06 LBS
6 964 Gs
|
14.09 kg / 31.06 LBS
14088 g / 138.2 N
|
84.53 kg / 186.36 LBS
~0 Gs
|
| 5 mm |
85.07 kg / 187.55 LBS
6 627 Gs
|
12.76 kg / 28.13 LBS
12760 g / 125.2 N
|
76.56 kg / 168.79 LBS
~0 Gs
|
| 10 mm |
64.27 kg / 141.70 LBS
5 761 Gs
|
9.64 kg / 21.25 LBS
9641 g / 94.6 N
|
57.85 kg / 127.53 LBS
~0 Gs
|
| 20 mm |
33.15 kg / 73.09 LBS
4 137 Gs
|
4.97 kg / 10.96 LBS
4973 g / 48.8 N
|
29.84 kg / 65.78 LBS
~0 Gs
|
| 50 mm |
3.84 kg / 8.47 LBS
1 408 Gs
|
0.58 kg / 1.27 LBS
576 g / 5.7 N
|
3.46 kg / 7.62 LBS
~0 Gs
|
| 60 mm |
1.99 kg / 4.39 LBS
1 014 Gs
|
0.30 kg / 0.66 LBS
299 g / 2.9 N
|
1.79 kg / 3.95 LBS
~0 Gs
|
| 70 mm |
1.08 kg / 2.38 LBS
747 Gs
|
0.16 kg / 0.36 LBS
162 g / 1.6 N
|
0.97 kg / 2.14 LBS
~0 Gs
|
| 80 mm |
0.61 kg / 1.35 LBS
563 Gs
|
0.09 kg / 0.20 LBS
92 g / 0.9 N
|
0.55 kg / 1.22 LBS
~0 Gs
|
| 90 mm |
0.36 kg / 0.80 LBS
432 Gs
|
0.05 kg / 0.12 LBS
54 g / 0.5 N
|
0.33 kg / 0.72 LBS
~0 Gs
|
| 100 mm |
0.22 kg / 0.49 LBS
339 Gs
|
0.03 kg / 0.07 LBS
33 g / 0.3 N
|
0.20 kg / 0.44 LBS
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
MW 40x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 19.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 15.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 11.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 9.0 cm |
| Remote | 50 Gs (5.0 mT) | 8.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Impact energy (cracking risk) - warning
MW 40x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.63 km/h
(5.73 m/s)
|
2.32 J | |
| 30 mm |
30.69 km/h
(8.52 m/s)
|
5.14 J | |
| 50 mm |
39.22 km/h
(10.89 m/s)
|
8.39 J | |
| 100 mm |
55.39 km/h
(15.39 m/s)
|
16.73 J |
Table 9: Anti-corrosion coating durability
MW 40x15 / 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 40x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 48 650 Mx | 486.5 µWb |
| Pc Coefficient | 0.48 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 40x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 42.64 kg | Standard |
| Water (riverbed) |
48.82 kg
(+6.18 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical wall, the magnet retains merely ~20% of its nominal pull.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.
3. Heat tolerance
*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) = 0.48
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 |
Other offers
Strengths as well as weaknesses of neodymium magnets.
Advantages
- Their magnetic field is durable, and after approximately ten years it decreases only by ~1% (theoretically),
- Neodymium magnets are characterized by highly resistant to demagnetization caused by magnetic disturbances,
- By covering with a lustrous layer of silver, the element presents an modern look,
- Magnetic induction on the working layer of the magnet turns out to be extremely intense,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Possibility of individual machining and adjusting to concrete conditions,
- Wide application in advanced technology sectors – they serve a role in data components, motor assemblies, medical equipment, and complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Cons
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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
- They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complex shapes in magnets, we propose using cover - magnetic holder.
- Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
- With budget limitations the cost of neodymium magnets can be a barrier,
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- using a sheet made of mild steel, serving as a ideal flux conductor
- whose transverse dimension reaches at least 10 mm
- with a surface cleaned and smooth
- under conditions of ideal adhesion (metal-to-metal)
- during detachment in a direction vertical to the mounting surface
- in neutral thermal conditions
Determinants of lifting force in real conditions
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Material type – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
- Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.
Safety rules for work with NdFeB magnets
Fire warning
Dust created during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Handling guide
Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.
Operating temperature
Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. This process is irreversible.
GPS and phone interference
GPS units and mobile phones are highly susceptible to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.
Finger safety
Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.
Do not give to children
Absolutely store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.
Safe distance
Data protection: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).
Life threat
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.
Nickel allergy
Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness appears, immediately stop working with magnets and use protective gear.
Protective goggles
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them cracking into shards.
