MW 33x30 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010058
GTIN/EAN: 5906301810575
Diameter Ø
33 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
192.44 g
Magnetization Direction
↑ axial
Load capacity
35.84 kg / 351.54 N
Magnetic Induction
543.05 mT / 5430 Gs
Coating
[NiCuNi] Nickel
52.89 ZŁ with VAT / pcs + price for transport
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Technical of the product - MW 33x30 / N38 - cylindrical magnet
Specification / characteristics - MW 33x30 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010058 |
| GTIN/EAN | 5906301810575 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 33 mm [±0,1 mm] |
| Height | 30 mm [±0,1 mm] |
| Weight | 192.44 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 35.84 kg / 351.54 N |
| Magnetic Induction ~ ? | 543.05 mT / 5430 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 simulation of the magnet - technical parameters
The following values are the direct effect of a physical simulation. Values rely on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Please consider these calculations as a preliminary roadmap for designers.
Table 1: Static pull force (pull vs distance) - interaction chart
MW 33x30 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5429 Gs
542.9 mT
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
crushing |
| 1 mm |
5098 Gs
509.8 mT
|
31.60 kg / 69.67 lbs
31600.1 g / 310.0 N
|
crushing |
| 2 mm |
4765 Gs
476.5 mT
|
27.60 kg / 60.85 lbs
27601.7 g / 270.8 N
|
crushing |
| 3 mm |
4436 Gs
443.6 mT
|
23.93 kg / 52.76 lbs
23930.4 g / 234.8 N
|
crushing |
| 5 mm |
3810 Gs
381.0 mT
|
17.65 kg / 38.91 lbs
17650.2 g / 173.1 N
|
crushing |
| 10 mm |
2518 Gs
251.8 mT
|
7.71 kg / 17.00 lbs
7709.5 g / 75.6 N
|
strong |
| 15 mm |
1650 Gs
165.0 mT
|
3.31 kg / 7.30 lbs
3312.1 g / 32.5 N
|
strong |
| 20 mm |
1105 Gs
110.5 mT
|
1.49 kg / 3.27 lbs
1485.1 g / 14.6 N
|
weak grip |
| 30 mm |
546 Gs
54.6 mT
|
0.36 kg / 0.80 lbs
361.9 g / 3.5 N
|
weak grip |
| 50 mm |
184 Gs
18.4 mT
|
0.04 kg / 0.09 lbs
41.4 g / 0.4 N
|
weak grip |
Table 2: Vertical force (vertical surface)
MW 33x30 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
7.17 kg / 15.80 lbs
7168.0 g / 70.3 N
|
| 1 mm | Stal (~0.2) |
6.32 kg / 13.93 lbs
6320.0 g / 62.0 N
|
| 2 mm | Stal (~0.2) |
5.52 kg / 12.17 lbs
5520.0 g / 54.2 N
|
| 3 mm | Stal (~0.2) |
4.79 kg / 10.55 lbs
4786.0 g / 47.0 N
|
| 5 mm | Stal (~0.2) |
3.53 kg / 7.78 lbs
3530.0 g / 34.6 N
|
| 10 mm | Stal (~0.2) |
1.54 kg / 3.40 lbs
1542.0 g / 15.1 N
|
| 15 mm | Stal (~0.2) |
0.66 kg / 1.46 lbs
662.0 g / 6.5 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 lbs
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.07 kg / 0.16 lbs
72.0 g / 0.7 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 33x30 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
10.75 kg / 23.70 lbs
10752.0 g / 105.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
7.17 kg / 15.80 lbs
7168.0 g / 70.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.58 kg / 7.90 lbs
3584.0 g / 35.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
17.92 kg / 39.51 lbs
17920.0 g / 175.8 N
|
Table 4: Steel thickness (saturation) - power losses
MW 33x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.79 kg / 3.95 lbs
1792.0 g / 17.6 N
|
| 1 mm |
|
4.48 kg / 9.88 lbs
4480.0 g / 43.9 N
|
| 2 mm |
|
8.96 kg / 19.75 lbs
8960.0 g / 87.9 N
|
| 3 mm |
|
13.44 kg / 29.63 lbs
13440.0 g / 131.8 N
|
| 5 mm |
|
22.40 kg / 49.38 lbs
22400.0 g / 219.7 N
|
| 10 mm |
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
| 11 mm |
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
| 12 mm |
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MW 33x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
OK |
| 40 °C | -2.2% |
35.05 kg / 77.28 lbs
35051.5 g / 343.9 N
|
OK |
| 60 °C | -4.4% |
34.26 kg / 75.54 lbs
34263.0 g / 336.1 N
|
OK |
| 80 °C | -6.6% |
33.47 kg / 73.80 lbs
33474.6 g / 328.4 N
|
|
| 100 °C | -28.8% |
25.52 kg / 56.26 lbs
25518.1 g / 250.3 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 33x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
155.43 kg / 342.66 lbs
5 974 Gs
|
23.31 kg / 51.40 lbs
23314 g / 228.7 N
|
N/A |
| 1 mm |
146.19 kg / 322.29 lbs
10 531 Gs
|
21.93 kg / 48.34 lbs
21928 g / 215.1 N
|
131.57 kg / 290.06 lbs
~0 Gs
|
| 2 mm |
137.04 kg / 302.12 lbs
10 196 Gs
|
20.56 kg / 45.32 lbs
20556 g / 201.7 N
|
123.34 kg / 271.91 lbs
~0 Gs
|
| 3 mm |
128.20 kg / 282.64 lbs
9 862 Gs
|
19.23 kg / 42.40 lbs
19230 g / 188.6 N
|
115.38 kg / 254.37 lbs
~0 Gs
|
| 5 mm |
111.55 kg / 245.93 lbs
9 199 Gs
|
16.73 kg / 36.89 lbs
16733 g / 164.2 N
|
100.40 kg / 221.34 lbs
~0 Gs
|
| 10 mm |
76.54 kg / 168.75 lbs
7 620 Gs
|
11.48 kg / 25.31 lbs
11481 g / 112.6 N
|
68.89 kg / 151.87 lbs
~0 Gs
|
| 20 mm |
33.43 kg / 73.71 lbs
5 036 Gs
|
5.02 kg / 11.06 lbs
5015 g / 49.2 N
|
30.09 kg / 66.34 lbs
~0 Gs
|
| 50 mm |
3.08 kg / 6.78 lbs
1 528 Gs
|
0.46 kg / 1.02 lbs
462 g / 4.5 N
|
2.77 kg / 6.11 lbs
~0 Gs
|
| 60 mm |
1.57 kg / 3.46 lbs
1 091 Gs
|
0.24 kg / 0.52 lbs
235 g / 2.3 N
|
1.41 kg / 3.11 lbs
~0 Gs
|
| 70 mm |
0.85 kg / 1.87 lbs
803 Gs
|
0.13 kg / 0.28 lbs
127 g / 1.2 N
|
0.76 kg / 1.69 lbs
~0 Gs
|
| 80 mm |
0.48 kg / 1.07 lbs
606 Gs
|
0.07 kg / 0.16 lbs
73 g / 0.7 N
|
0.44 kg / 0.96 lbs
~0 Gs
|
| 90 mm |
0.29 kg / 0.64 lbs
468 Gs
|
0.04 kg / 0.10 lbs
43 g / 0.4 N
|
0.26 kg / 0.57 lbs
~0 Gs
|
| 100 mm |
0.18 kg / 0.40 lbs
369 Gs
|
0.03 kg / 0.06 lbs
27 g / 0.3 N
|
0.16 kg / 0.36 lbs
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MW 33x30 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 20.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 16.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 12.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 9.5 cm |
| Remote | 50 Gs (5.0 mT) | 9.0 cm |
| Payment card | 400 Gs (40.0 mT) | 4.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 33x30 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
15.50 km/h
(4.31 m/s)
|
1.78 J | |
| 30 mm |
23.99 km/h
(6.66 m/s)
|
4.27 J | |
| 50 mm |
30.80 km/h
(8.55 m/s)
|
7.04 J | |
| 100 mm |
43.52 km/h
(12.09 m/s)
|
14.06 J |
Table 9: Anti-corrosion coating durability
MW 33x30 / 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 33x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 47 447 Mx | 474.5 µWb |
| Pc Coefficient | 0.85 | High (Stable) |
Table 11: Physics of underwater searching
MW 33x30 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 35.84 kg | Standard |
| Water (riverbed) |
41.04 kg
(+5.20 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Thermal stability
*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) = 0.85
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 |
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Pros as well as cons of rare earth magnets.
Pros
- They do not lose power, even during around ten years – the reduction in strength is only ~1% (based on measurements),
- Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external magnetic fields,
- By using a smooth layer of nickel, the element acquires an modern look,
- Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Thanks to flexibility in forming and the capacity to adapt to client solutions,
- Wide application in modern technologies – they are commonly used in hard drives, brushless drives, advanced medical instruments, as well as technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Disadvantages
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
- We suggest cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
- Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products are able to disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets is economically unviable,
Lifting parameters
Maximum holding power of the magnet – what contributes to it?
- using a sheet made of high-permeability steel, acting as a magnetic yoke
- whose thickness reaches at least 10 mm
- with an ideally smooth contact surface
- with zero gap (no impurities)
- during pulling in a direction perpendicular to the plane
- in neutral thermal conditions
Lifting capacity in practice – influencing factors
- Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
- Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Steel thickness – too thin steel does not accept the full field, causing part of the power to be escaped into the air.
- Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
- Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.
Safety rules for work with neodymium magnets
Thermal limits
Avoid heat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Electronic hazard
Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Medical interference
Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Immense force
Handle with care. Neodymium magnets attract from a long distance and snap with massive power, often quicker than you can react.
Machining danger
Combustion risk: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.
Serious injuries
Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!
Keep away from children
Strictly keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.
Risk of cracking
Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Metal Allergy
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop working with magnets and use protective gear.
GPS and phone interference
Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.
