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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 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
properties values
Cat. no. 010058
GTIN/EAN 5906301810575
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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

Specification / characteristics MW 33x30 / N38 - cylindrical magnet
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

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
5%
1.79 kg / 3.95 LBS
1792.0 g / 17.6 N
1 mm
13%
4.48 kg / 9.88 LBS
4480.0 g / 43.9 N
2 mm
25%
8.96 kg / 19.75 LBS
8960.0 g / 87.9 N
3 mm
38%
13.44 kg / 29.63 LBS
13440.0 g / 131.8 N
5 mm
63%
22.40 kg / 49.38 LBS
22400.0 g / 219.7 N
10 mm
100%
35.84 kg / 79.01 LBS
35840.0 g / 351.6 N
11 mm
100%
35.84 kg / 79.01 LBS
35840.0 g / 351.6 N
12 mm
100%
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
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.

Technical specification and ecology
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
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010058-2026
Magnet Unit Converter
Magnet pull force

Magnetic Field

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This product is an extremely powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø33x30 mm, guarantees the highest energy density. The MW 33x30 / N38 component boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 35.84 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 351.54 N with a weight of only 192.44 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 33.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø33x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 33 mm and height 30 mm. The value of 351.54 N means that the magnet is capable of holding a weight many times exceeding its own mass of 192.44 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 30 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • 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

Cons of neodymium magnets and proposals for their use:
  • 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 magnetwhat it depends on?

The specified lifting capacity represents the maximum value, measured under laboratory conditions, meaning:
  • 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

In real-world applications, the actual lifting capacity results from several key aspects, presented from the most important:
  • 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.

Important! Need more info? Check our post: Why are neodymium magnets dangerous?