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
43.00 ZŁ net + 23% VAT / pcs
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Technical - 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 |
Engineering modeling of the magnet - report
These data constitute the result of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these data as a reference point for designers.
Table 1: Static pull force (pull vs distance) - power drop
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 pounds
35840.0 g / 351.6 N
|
critical level |
| 1 mm |
5098 Gs
509.8 mT
|
31.60 kg / 69.67 pounds
31600.1 g / 310.0 N
|
critical level |
| 2 mm |
4765 Gs
476.5 mT
|
27.60 kg / 60.85 pounds
27601.7 g / 270.8 N
|
critical level |
| 3 mm |
4436 Gs
443.6 mT
|
23.93 kg / 52.76 pounds
23930.4 g / 234.8 N
|
critical level |
| 5 mm |
3810 Gs
381.0 mT
|
17.65 kg / 38.91 pounds
17650.2 g / 173.1 N
|
critical level |
| 10 mm |
2518 Gs
251.8 mT
|
7.71 kg / 17.00 pounds
7709.5 g / 75.6 N
|
medium risk |
| 15 mm |
1650 Gs
165.0 mT
|
3.31 kg / 7.30 pounds
3312.1 g / 32.5 N
|
medium risk |
| 20 mm |
1105 Gs
110.5 mT
|
1.49 kg / 3.27 pounds
1485.1 g / 14.6 N
|
low risk |
| 30 mm |
546 Gs
54.6 mT
|
0.36 kg / 0.80 pounds
361.9 g / 3.5 N
|
low risk |
| 50 mm |
184 Gs
18.4 mT
|
0.04 kg / 0.09 pounds
41.4 g / 0.4 N
|
low risk |
Table 2: Vertical hold (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 pounds
7168.0 g / 70.3 N
|
| 1 mm | Stal (~0.2) |
6.32 kg / 13.93 pounds
6320.0 g / 62.0 N
|
| 2 mm | Stal (~0.2) |
5.52 kg / 12.17 pounds
5520.0 g / 54.2 N
|
| 3 mm | Stal (~0.2) |
4.79 kg / 10.55 pounds
4786.0 g / 47.0 N
|
| 5 mm | Stal (~0.2) |
3.53 kg / 7.78 pounds
3530.0 g / 34.6 N
|
| 10 mm | Stal (~0.2) |
1.54 kg / 3.40 pounds
1542.0 g / 15.1 N
|
| 15 mm | Stal (~0.2) |
0.66 kg / 1.46 pounds
662.0 g / 6.5 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 pounds
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.07 kg / 0.16 pounds
72.0 g / 0.7 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
8.0 g / 0.1 N
|
Table 3: Wall mounting (shearing) - 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 pounds
10752.0 g / 105.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
7.17 kg / 15.80 pounds
7168.0 g / 70.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.58 kg / 7.90 pounds
3584.0 g / 35.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
17.92 kg / 39.51 pounds
17920.0 g / 175.8 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 33x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.79 kg / 3.95 pounds
1792.0 g / 17.6 N
|
| 1 mm |
|
4.48 kg / 9.88 pounds
4480.0 g / 43.9 N
|
| 2 mm |
|
8.96 kg / 19.75 pounds
8960.0 g / 87.9 N
|
| 3 mm |
|
13.44 kg / 29.63 pounds
13440.0 g / 131.8 N
|
| 5 mm |
|
22.40 kg / 49.38 pounds
22400.0 g / 219.7 N
|
| 10 mm |
|
35.84 kg / 79.01 pounds
35840.0 g / 351.6 N
|
| 11 mm |
|
35.84 kg / 79.01 pounds
35840.0 g / 351.6 N
|
| 12 mm |
|
35.84 kg / 79.01 pounds
35840.0 g / 351.6 N
|
Table 5: Working in heat (material behavior) - thermal limit
MW 33x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
35.84 kg / 79.01 pounds
35840.0 g / 351.6 N
|
OK |
| 40 °C | -2.2% |
35.05 kg / 77.28 pounds
35051.5 g / 343.9 N
|
OK |
| 60 °C | -4.4% |
34.26 kg / 75.54 pounds
34263.0 g / 336.1 N
|
OK |
| 80 °C | -6.6% |
33.47 kg / 73.80 pounds
33474.6 g / 328.4 N
|
|
| 100 °C | -28.8% |
25.52 kg / 56.26 pounds
25518.1 g / 250.3 N
|
Table 6: Two magnets (repulsion) - field range
MW 33x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
155.43 kg / 342.66 pounds
5 974 Gs
|
23.31 kg / 51.40 pounds
23314 g / 228.7 N
|
N/A |
| 1 mm |
146.19 kg / 322.29 pounds
10 531 Gs
|
21.93 kg / 48.34 pounds
21928 g / 215.1 N
|
131.57 kg / 290.06 pounds
~0 Gs
|
| 2 mm |
137.04 kg / 302.12 pounds
10 196 Gs
|
20.56 kg / 45.32 pounds
20556 g / 201.7 N
|
123.34 kg / 271.91 pounds
~0 Gs
|
| 3 mm |
128.20 kg / 282.64 pounds
9 862 Gs
|
19.23 kg / 42.40 pounds
19230 g / 188.6 N
|
115.38 kg / 254.37 pounds
~0 Gs
|
| 5 mm |
111.55 kg / 245.93 pounds
9 199 Gs
|
16.73 kg / 36.89 pounds
16733 g / 164.2 N
|
100.40 kg / 221.34 pounds
~0 Gs
|
| 10 mm |
76.54 kg / 168.75 pounds
7 620 Gs
|
11.48 kg / 25.31 pounds
11481 g / 112.6 N
|
68.89 kg / 151.87 pounds
~0 Gs
|
| 20 mm |
33.43 kg / 73.71 pounds
5 036 Gs
|
5.02 kg / 11.06 pounds
5015 g / 49.2 N
|
30.09 kg / 66.34 pounds
~0 Gs
|
| 50 mm |
3.08 kg / 6.78 pounds
1 528 Gs
|
0.46 kg / 1.02 pounds
462 g / 4.5 N
|
2.77 kg / 6.11 pounds
~0 Gs
|
| 60 mm |
1.57 kg / 3.46 pounds
1 091 Gs
|
0.24 kg / 0.52 pounds
235 g / 2.3 N
|
1.41 kg / 3.11 pounds
~0 Gs
|
| 70 mm |
0.85 kg / 1.87 pounds
803 Gs
|
0.13 kg / 0.28 pounds
127 g / 1.2 N
|
0.76 kg / 1.69 pounds
~0 Gs
|
| 80 mm |
0.48 kg / 1.07 pounds
606 Gs
|
0.07 kg / 0.16 pounds
73 g / 0.7 N
|
0.44 kg / 0.96 pounds
~0 Gs
|
| 90 mm |
0.29 kg / 0.64 pounds
468 Gs
|
0.04 kg / 0.10 pounds
43 g / 0.4 N
|
0.26 kg / 0.57 pounds
~0 Gs
|
| 100 mm |
0.18 kg / 0.40 pounds
369 Gs
|
0.03 kg / 0.06 pounds
27 g / 0.3 N
|
0.16 kg / 0.36 pounds
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
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 |
| Phone / Smartphone | 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: Dynamics (cracking risk) - 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 (Pc)
MW 33x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 47 447 Mx | 474.5 µWb |
| Pc Coefficient | 0.85 | High (Stable) |
Table 11: Underwater work (magnet fishing)
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. Sliding resistance
*Caution: On a vertical surface, the magnet retains only a fraction of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically reduces the holding force.
3. Temperature resistance
*For N38 grade, the safety 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 |
See also deals
Pros as well as cons of neodymium magnets.
Benefits
- They have constant strength, and over around ten years their performance decreases symbolically – ~1% (in testing),
- They retain their magnetic properties even under strong external field,
- Thanks to the smooth finish, the coating of nickel, gold-plated, or silver-plated gives an elegant appearance,
- They show high magnetic induction at the operating surface, which affects their effectiveness,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to modularity in constructing and the capacity to adapt to specific needs,
- Versatile presence in modern technologies – they are utilized in HDD drives, electromotive mechanisms, medical equipment, as well as complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Disadvantages
- Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their 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 stability even at temperatures up to 230°C
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited ability of producing threads in the magnet and complicated shapes - recommended is casing - magnetic holder.
- Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to be problematic in diagnostics medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Maximum lifting capacity of the magnet – what it depends on?
- on a plate made of structural steel, effectively closing the magnetic flux
- with a cross-section minimum 10 mm
- with a plane perfectly flat
- without any air gap between the magnet and steel
- under perpendicular application of breakaway force (90-degree angle)
- in temp. approx. 20°C
What influences lifting capacity in practice
- Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Plate material – mild steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
- Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
- Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the load capacity.
Precautions when working with neodymium magnets
Flammability
Fire warning: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.
Safe distance
Intense magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.
Medical interference
Patients with a pacemaker should keep an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.
Maximum temperature
Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. Damage is permanent.
GPS Danger
GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can decalibrate the internal compass in your phone.
Avoid contact if allergic
A percentage of the population have a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Extended handling might lead to dermatitis. It is best to wear protective gloves.
Crushing risk
Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Danger to the youngest
Absolutely keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are life-threatening.
Safe operation
Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can move away.
Beware of splinters
Protect your eyes. Magnets can explode upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.
