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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

technical parameters »

52.89 ZŁ with VAT / pcs + price for transport

43.00 ZŁ net + 23% VAT / pcs

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Technical - 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 product - data

Presented information are the result of a engineering calculation. Values rely on models for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force 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 pounds
35840.0 g / 351.6 N
 crushing
1 mm 5098 Gs
509.8 mT
 31.60 kg / 69.67 pounds
31600.1 g / 310.0 N
 crushing
2 mm 4765 Gs
476.5 mT
 27.60 kg / 60.85 pounds
27601.7 g / 270.8 N
 crushing
3 mm 4436 Gs
443.6 mT
 23.93 kg / 52.76 pounds
23930.4 g / 234.8 N
 crushing
5 mm 3810 Gs
381.0 mT
 17.65 kg / 38.91 pounds
17650.2 g / 173.1 N
 crushing
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
Magnetic force weakens significantly per each millimeter of spacing. Remember that even a microscopic distance (e.g., contamination, varnish, rust) strongly diminishes the holding power. Magnetic products hold strongest in perfect adhesion; gap drastically cuts the force. See how quickly the parameters fall, when the magnet does not adhere flatly to the steel surface. When planning the assembly, eliminate redundant distances.

Table 2: Shear capacity (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 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
This section indicates the approximate weight limit required to cause the sliding of the magnet vertically on a vertical steel wall (considering typical friction). This parameter is relative to the distance between the magnet and the surface.

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 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
When mounting a magnet on a vertical wall (e.g., a board), it will maintain barely about 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that magnets slide down easier than they pop off the substrate. Planning a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the element will slide down under a much lighter load. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (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 pounds
1792.0 g / 17.6 N
1 mm
13%
 4.48 kg / 9.88 pounds
4480.0 g / 43.9 N
2 mm
25%
 8.96 kg / 19.75 pounds
8960.0 g / 87.9 N
3 mm
38%
 13.44 kg / 29.63 pounds
13440.0 g / 131.8 N
5 mm
63%
 22.40 kg / 49.38 pounds
22400.0 g / 219.7 N
10 mm
100%
 35.84 kg / 79.01 pounds
35840.0 g / 351.6 N
11 mm
100%
 35.84 kg / 79.01 pounds
35840.0 g / 351.6 N
12 mm
100%
 35.84 kg / 79.01 pounds
35840.0 g / 351.6 N
A thin metal plate is unable to take in the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of steel. The saturation effect causes that on delicate walls (e.g., appliance housings), the magnet holds weaker. We advise picking the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - 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
Ordinary NdFeB products irreversibly lose strength past the thermal threshold. Protect against heat – high temperature can irreversibly destroy this product. With increasing heat, the magnet's power temporarily lowers. Refrain from using this magnet close to ovens exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - 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 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
Two magnets interact from a wider radius than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of operation. Planning to create a strong closure? Apply two magnets instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is extreme. The repulsion force is marginally weaker than the connection force, but still large.
*Field value between like poles reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Figures show friction force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
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
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
A strong magnetic field poses a real danger to IT equipment as well as pacemakers. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (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
NdFeB products are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when handling with large magnets.

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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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)
Flux value emitted by the magnet pole. Key data in coil applications and motors. Pc value determines the working geometry.

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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly 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.

Technical and environmental data
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
Measurement Calculator
Magnet pull force
Field Strength
Type your figure into any field, and the remaining fields will recalculate on the fly.

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This product is an extremely powerful cylinder magnet, made from modern NdFeB material, which, with dimensions of Ø33x30 mm, guarantees maximum efficiency. This specific item features a tolerance of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 35.84 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced 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 rod is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 33.1 mm) using epoxy glues. To ensure long-term durability 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 popular standard for professional neodymium magnets, offering a great economic balance 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 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 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 secures it against external factors, 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 through the diameter if your project requires it.

Pros as well as cons of rare earth magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They do not lose their magnetic properties even under external field action,
  • A magnet with a smooth silver surface has better aesthetics,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
  • Possibility of custom shaping as well as adapting to defined needs,
  • Versatile presence in modern industrial fields – they are utilized in hard drives, drive modules, medical equipment, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these magnets are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Pull force analysis

Highest magnetic holding force – what contributes to it?

The load parameter shown concerns the maximum value, measured under laboratory conditions, namely:
  • using a sheet made of high-permeability steel, acting as a circuit closing element
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a surface free of scratches
  • with zero gap (no coatings)
  • under vertical force vector (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

In real-world applications, the real power is determined by a number of factors, presented from most significant:
  • Air gap (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped to the other side.
  • Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, 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 lowers the load capacity.

H&S for magnets
Eye protection

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Allergic reactions

Studies show that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact and opt for coated magnets.

Serious injuries

Large magnets can break fingers instantly. Do not place your hand between two attracting surfaces.

Danger to the youngest

Adult use only. Tiny parts pose a choking risk, causing severe trauma. Store away from kids and pets.

ICD Warning

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Demagnetization risk

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Keep away from computers

Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Machining danger

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Immense force

Use magnets with awareness. Their huge power can surprise even professionals. Be vigilant and respect their force.

Phone sensors

An intense magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Maintain magnets close to a smartphone to prevent breaking the sensors.

Safety First! More info about risks in the article: Magnet Safety Guide.