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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Physical properties - 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 - data
These values are the outcome of a physical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Treat these calculations as a supplementary guide for designers.
Table 1: Static pull force (pull vs gap) - 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
|
critical level |
| 1 mm |
5098 Gs
509.8 mT
|
31.60 kg / 69.67 LBS
31600.1 g / 310.0 N
|
critical level |
| 2 mm |
4765 Gs
476.5 mT
|
27.60 kg / 60.85 LBS
27601.7 g / 270.8 N
|
critical level |
| 3 mm |
4436 Gs
443.6 mT
|
23.93 kg / 52.76 LBS
23930.4 g / 234.8 N
|
critical level |
| 5 mm |
3810 Gs
381.0 mT
|
17.65 kg / 38.91 LBS
17650.2 g / 173.1 N
|
critical level |
| 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
|
safe |
| 30 mm |
546 Gs
54.6 mT
|
0.36 kg / 0.80 LBS
361.9 g / 3.5 N
|
safe |
| 50 mm |
184 Gs
18.4 mT
|
0.04 kg / 0.09 LBS
41.4 g / 0.4 N
|
safe |
Table 2: Slippage capacity (wall)
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: Vertical assembly (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 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: Working in heat (stability) - power drop
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: Two magnets (repulsion) - field range
MW 33x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (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: Safety (HSE) (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 |
| 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: Collisions (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: Coating parameters (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. Vertical hold
*Warning: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Heat tolerance
*For standard magnets, the max working temp 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.
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 |
View more offers
Strengths as well as weaknesses of Nd2Fe14B magnets.
Pros
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
- They are extremely resistant to demagnetization induced by external field influence,
- A magnet with a shiny gold surface has better aesthetics,
- Magnets have impressive magnetic induction on the active area,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to the possibility of precise forming and adaptation to custom requirements, neodymium magnets can be modeled in a variety of shapes and sizes, which amplifies use scope,
- Significant place in advanced technology sectors – they find application in data components, motor assemblies, medical equipment, as well as other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- To avoid cracks upon strong impacts, 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 strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- We recommend a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
- Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these products can disrupt the diagnostic process medical when they are in the body.
- Due to expensive raw materials, their price exceeds standard values,
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what it depends on?
- on a plate made of structural steel, optimally conducting the magnetic field
- whose thickness reaches at least 10 mm
- with an ideally smooth touching surface
- with direct contact (no impurities)
- during pulling in a direction vertical to the plane
- in stable room temperature
Determinants of practical lifting force of a magnet
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
- Plate thickness – too thin steel causes magnetic saturation, causing part of the power to be lost to the other side.
- Steel type – low-carbon steel gives the best results. Alloy steels reduce magnetic properties and lifting capacity.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the load capacity.
H&S for magnets
Sensitization to coating
A percentage of the population suffer from a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching might lead to an allergic reaction. We recommend wear safety gloves.
GPS and phone interference
An intense magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Do not bring magnets near a smartphone to avoid damaging the sensors.
Mechanical processing
Machining of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Serious injuries
Large magnets can crush fingers instantly. Under no circumstances place your hand between two strong magnets.
Electronic devices
Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.
Fragile material
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Health Danger
For implant holders: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Maximum temperature
Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
Adults only
NdFeB magnets are not intended for children. Swallowing several magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates urgent medical intervention.
Handling guide
Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often faster than you can react.
