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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 details - 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 simulation of the magnet - technical parameters

The following data are the result of a engineering calculation. Values rely on algorithms for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (force vs gap) - characteristics
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
dangerous!
1 mm 5098 Gs
509.8 mT
31.60 kg / 69.67 pounds
31600.1 g / 310.0 N
dangerous!
2 mm 4765 Gs
476.5 mT
27.60 kg / 60.85 pounds
27601.7 g / 270.8 N
dangerous!
3 mm 4436 Gs
443.6 mT
23.93 kg / 52.76 pounds
23930.4 g / 234.8 N
dangerous!
5 mm 3810 Gs
381.0 mT
17.65 kg / 38.91 pounds
17650.2 g / 173.1 N
dangerous!
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

Table 2: Sliding force (wall)
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

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 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

Table 4: Material efficiency (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 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

Table 5: Thermal resistance (material behavior) - 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

Table 6: Two magnets (attraction) - forces in the system
MW 33x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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

Table 7: Hazards (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: Impact energy (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

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

*Caution: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically 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 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%
Sustainability
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
Pulling force

Field Strength

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The presented product is an exceptionally strong cylindrical magnet, manufactured from modern NdFeB material, which, with dimensions of Ø33x30 mm, guarantees maximum efficiency. The MW 33x30 / N38 model boasts high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding 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. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, 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 cylindrical magnet 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 two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives 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 operational stability. 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 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 power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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.

Strengths and weaknesses of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain magnetic properties for almost ten years – the loss is just ~1% (according to analyses),
  • They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • A magnet with a metallic silver surface has better aesthetics,
  • Magnetic induction on the working layer of the magnet remains strong,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the option of flexible shaping and adaptation to custom projects, NdFeB magnets can be produced in a variety of geometric configurations, which makes them more universal,
  • Versatile presence in advanced technology sectors – they are commonly used in computer drives, brushless drives, diagnostic systems, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of producing nuts in the magnet and complicated forms - recommended is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting capacity of the magnetwhat it depends on?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • with direct contact (without paint)
  • for force applied at a right angle (in the magnet axis)
  • at room temperature

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by working environment parameters, mainly (from priority):
  • Distance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Mechanical processing

Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Life threat

People with a ICD should maintain an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Keep away from electronics

An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to avoid damaging the sensors.

Crushing risk

Risk of injury: The attraction force is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

This is not a toy

Adult use only. Tiny parts can be swallowed, causing severe trauma. Keep out of reach of kids and pets.

Allergic reactions

It is widely known that nickel (standard magnet coating) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands or choose versions in plastic housing.

Electronic hazard

Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Magnet fragility

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Conscious usage

Handle with care. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can move away.

Heat warning

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98