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 details - 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 |
Physical simulation of the magnet - technical parameters
The following data are the result of a engineering calculation. Values rely on algorithms for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Treat these calculations as a supplementary guide for designers.
Table 1: Static force (force vs gap) - characteristics
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
|
dangerous! |
| 1 mm |
5098 Gs
509.8 mT
|
31.60 kg / 69.67 pounds
31600.1 g / 310.0 N
|
dangerous! |
| 2 mm |
4765 Gs
476.5 mT
|
27.60 kg / 60.85 pounds
27601.7 g / 270.8 N
|
dangerous! |
| 3 mm |
4436 Gs
443.6 mT
|
23.93 kg / 52.76 pounds
23930.4 g / 234.8 N
|
dangerous! |
| 5 mm |
3810 Gs
381.0 mT
|
17.65 kg / 38.91 pounds
17650.2 g / 173.1 N
|
dangerous! |
| 10 mm |
2518 Gs
251.8 mT
|
7.71 kg / 17.00 pounds
7709.5 g / 75.6 N
|
warning |
| 15 mm |
1650 Gs
165.0 mT
|
3.31 kg / 7.30 pounds
3312.1 g / 32.5 N
|
warning |
| 20 mm |
1105 Gs
110.5 mT
|
1.49 kg / 3.27 pounds
1485.1 g / 14.6 N
|
weak grip |
| 30 mm |
546 Gs
54.6 mT
|
0.36 kg / 0.80 pounds
361.9 g / 3.5 N
|
weak grip |
| 50 mm |
184 Gs
18.4 mT
|
0.04 kg / 0.09 pounds
41.4 g / 0.4 N
|
weak grip |
Table 2: Sliding force (wall)
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: Vertical assembly (shearing) - vertical pull
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) - power losses
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: Thermal resistance (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 (attraction) - forces in the system
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: Hazards (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 |
| Phone / Smartphone | 40 Gs (4.0 mT) | 9.5 cm |
| Car key | 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 (cracking risk) - warning
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: Surface protection spec
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: Submerged application
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 wall, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) drastically weakens 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) = 0.85
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See more proposals
Strengths and weaknesses of rare earth magnets.
Advantages
- They retain magnetic properties for almost ten years – the loss is just ~1% (according to analyses),
- They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
- A magnet with a metallic silver surface has better aesthetics,
- Magnetic induction on the working layer of the magnet remains strong,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Considering the option of flexible shaping and adaptation to custom projects, NdFeB magnets can be produced in a variety of geometric configurations, which makes them more universal,
- Versatile presence in advanced technology sectors – they are commonly used in computer drives, brushless drives, diagnostic systems, as well as modern systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices
Cons
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its 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 corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Limited ability of producing nuts in the magnet and complicated forms - recommended is a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- on a block made of mild steel, optimally conducting the magnetic flux
- whose thickness is min. 10 mm
- characterized by smoothness
- with direct contact (without paint)
- for force applied at a right angle (in the magnet axis)
- at room temperature
Practical lifting capacity: influencing factors
- Distance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
- Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.
Warnings
Mechanical processing
Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Life threat
People with a ICD should maintain an large gap from magnets. The magnetism can stop the functioning of the life-saving device.
Keep away from electronics
An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to avoid damaging the sensors.
Crushing risk
Risk of injury: The attraction force is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
This is not a toy
Adult use only. Tiny parts can be swallowed, causing severe trauma. Keep out of reach of kids and pets.
Allergic reactions
It is widely known that nickel (standard magnet coating) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands or choose versions in plastic housing.
Electronic hazard
Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).
Magnet fragility
Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Conscious usage
Handle with care. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can move away.
Heat warning
Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.
