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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

Physical analysis of the product - report

The following information represent the result of a physical simulation. Results rely on models for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.

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: Slippage load (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: Vertical assembly (shearing) - vertical pull
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 (substrate influence) - 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 (material behavior) - 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: Magnet-Magnet interaction (attraction) - 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) (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
Timepiece 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

Table 8: Dynamics (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 (Pc)
MW 33x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 47 447 Mx 474.5 µWb
Pc Coefficient 0.85 High (Stable)

Table 11: Underwater work (magnet fishing)
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. computer case) severely 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

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.

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%
Environmental data
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
Force (pull)

Magnetic Induction

Check out also products

The offered product is an exceptionally strong cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø33x30 mm, guarantees maximum efficiency. The MW 33x30 / N38 model is characterized by an accuracy of ±0.1mm and professional build quality, making it a perfect 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 quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 351.54 N with a weight of only 192.44 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade 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 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 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.
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. Such an arrangement is most desirable 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • Magnets effectively resist against demagnetization caused by foreign field sources,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in designing and the capacity to adapt to specific needs,
  • Universal use in electronics industry – they are used in magnetic memories, electromotive mechanisms, medical devices, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in miniature devices

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum magnetic pulling forcewhat it depends on?

The specified lifting capacity concerns the peak performance, recorded under laboratory conditions, namely:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • whose thickness equals approx. 10 mm
  • characterized by smoothness
  • without any insulating layer between the magnet and steel
  • during detachment in a direction perpendicular to the plane
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

In practice, the actual lifting capacity depends on a number of factors, listed from the most important:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Risk of cracking

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Fire risk

Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Physical harm

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing anything in their path. Be careful!

Nickel allergy

Some people experience a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching can result in an allergic reaction. We strongly advise use protective gloves.

Choking Hazard

Absolutely keep magnets out of reach of children. Choking hazard is significant, and the effects of magnets connecting inside the body are tragic.

Conscious usage

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Magnetic interference

GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Maximum temperature

Monitor thermal conditions. Heating the magnet to high heat will destroy its magnetic structure and strength.

Health Danger

Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Threat to electronics

Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Danger! More info about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98