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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 specification - 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 analysis of the product - technical parameters

These information constitute the outcome of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Operational parameters may differ. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static 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
dangerous!
1 mm 5098 Gs
509.8 mT
31.60 kg / 69.67 lbs
31600.1 g / 310.0 N
dangerous!
2 mm 4765 Gs
476.5 mT
27.60 kg / 60.85 lbs
27601.7 g / 270.8 N
dangerous!
3 mm 4436 Gs
443.6 mT
23.93 kg / 52.76 lbs
23930.4 g / 234.8 N
dangerous!
5 mm 3810 Gs
381.0 mT
17.65 kg / 38.91 lbs
17650.2 g / 173.1 N
dangerous!
10 mm 2518 Gs
251.8 mT
7.71 kg / 17.00 lbs
7709.5 g / 75.6 N
medium risk
15 mm 1650 Gs
165.0 mT
3.31 kg / 7.30 lbs
3312.1 g / 32.5 N
medium risk
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 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: Material efficiency (substrate influence) - sheet metal selection
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 resistance (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) Shear 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
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: Dynamics (kinetic energy) - 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: Electrical 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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

*Caution: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*For N38 material, 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

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.

Engineering data and GPSR
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
Pulling force

Field Strength

Other offers

The presented product is an exceptionally strong rod magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø33x30 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 35.84 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 351.54 N with a weight of only 192.44 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. 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.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger 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 store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 33 mm and height 30 mm. The key parameter here is the holding force amounting to approximately 35.84 kg (force ~351.54 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 33 mm. 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They retain attractive force for nearly ten years – the drop is just ~1% (based on simulations),
  • They feature excellent resistance to magnetic field loss due to external fields,
  • In other words, due to the smooth surface of gold, the element looks attractive,
  • Magnetic induction on the working part of the magnet remains exceptional,
  • 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 the ability of free forming and adaptation to individualized solutions, NdFeB magnets can be produced in a wide range of geometric configurations, which increases their versatility,
  • Fundamental importance in future technologies – they are utilized in HDD drives, motor assemblies, medical equipment, and industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in producing nuts and complicated forms in magnets, we recommend using casing - magnetic mount.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
  • 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

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The load parameter shown represents the limit force, measured under optimal environment, specifically:
  • on a plate made of structural steel, optimally conducting the magnetic field
  • with a cross-section minimum 10 mm
  • characterized by even structure
  • with direct contact (no coatings)
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

It is worth knowing that the magnet holding may be lower subject to elements below, in order of importance:
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Impact on smartphones

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Crushing risk

Mind your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Cards and drives

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Machining danger

Dust produced during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Shattering risk

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Permanent damage

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Handling guide

Handle magnets consciously. Their powerful strength can shock even experienced users. Be vigilant and do not underestimate their power.

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Swallowing risk

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from children and animals.

ICD Warning

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Warning! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98