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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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Technical of the product - 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

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
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: 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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
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.

Technical specification and ecology
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
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
Measurement Calculator
Magnet pull force

Field Strength

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This product is a very strong cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø33x30 mm, guarantees maximum efficiency. This specific item features an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 35.84 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 351.54 N with a weight of only 192.44 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. 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 available off-the-shelf 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 rod magnet is magnetized axially (along the height of 30 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros as well as cons of rare earth magnets.

Pros

Apart from their consistent power, neodymium magnets have these key benefits:
  • 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

Disadvantages of NdFeB magnets:
  • 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?

Information about lifting capacity was defined for ideal contact conditions, including:
  • 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

Effective lifting capacity is affected by specific conditions, such as (from most important):
  • 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.

Safety First! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98