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MW 80x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010100

GTIN/EAN: 5906301810995

5.00

Diameter Ø

80 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

1130.97 g

Magnetization Direction

↑ axial

Load capacity

170.64 kg / 1673.99 N

Magnetic Induction

371.95 mT / 3720 Gs

Coating

[NiCuNi] Nickel

view parameters »

415.00 ZŁ with VAT / pcs + price for transport

337.40 ZŁ net + 23% VAT / pcs

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Give us a call +48 22 499 98 98 if you prefer send us a note by means of our online form the contact section.
Specifications as well as shape of neodymium magnets can be calculated using our magnetic calculator.

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Physical properties - MW 80x30 / N38 - cylindrical magnet

Specification / characteristics - MW 80x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010100
GTIN/EAN 5906301810995
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 80 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 1130.97 g
Magnetization Direction ↑ axial
Load capacity ~ ? 170.64 kg / 1673.99 N
Magnetic Induction ~ ? 371.95 mT / 3720 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 80x30 / 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 assembly - data

These data represent the result of a engineering calculation. Results are based on algorithms for the class Nd2Fe14B. Operational performance might slightly differ. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 80x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3719 Gs
371.9 mT
 170.64 kg / 376.20 pounds
170640.0 g / 1674.0 N
 critical level
1 mm 3643 Gs
364.3 mT
 163.71 kg / 360.93 pounds
163714.9 g / 1606.0 N
 critical level
2 mm 3563 Gs
356.3 mT
 156.65 kg / 345.35 pounds
156647.8 g / 1536.7 N
 critical level
3 mm 3482 Gs
348.2 mT
 149.55 kg / 329.71 pounds
149554.1 g / 1467.1 N
 critical level
5 mm 3314 Gs
331.4 mT
 135.46 kg / 298.63 pounds
135457.0 g / 1328.8 N
 critical level
10 mm 2880 Gs
288.0 mT
 102.34 kg / 225.63 pounds
102343.3 g / 1004.0 N
 critical level
15 mm 2457 Gs
245.7 mT
 74.47 kg / 164.17 pounds
74468.4 g / 730.5 N
 critical level
20 mm 2069 Gs
206.9 mT
 52.79 kg / 116.38 pounds
52789.9 g / 517.9 N
 critical level
30 mm 1439 Gs
143.9 mT
 25.53 kg / 56.29 pounds
25534.0 g / 250.5 N
 critical level
50 mm 704 Gs
70.4 mT
 6.11 kg / 13.48 pounds
6115.0 g / 60.0 N
 strong
Pulling power drops sharply with every subsequent millimeter of gap. Note that even a very thin break (e.g., contamination, paint, veneer) strongly weakens the grip. Magnetic products hold strongest during direct contact; distance kills the force. Observe how rapidly the pull force plummet, when the magnet does not adhere directly to the steel surface. When designing the arrangement, eliminate redundant distances.

Table 2: Slippage capacity (wall)
MW 80x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 34.13 kg / 75.24 pounds
34128.0 g / 334.8 N
1 mm Stal (~0.2) 32.74 kg / 72.18 pounds
32742.0 g / 321.2 N
2 mm Stal (~0.2) 31.33 kg / 69.07 pounds
31330.0 g / 307.3 N
3 mm Stal (~0.2) 29.91 kg / 65.94 pounds
29910.0 g / 293.4 N
5 mm Stal (~0.2) 27.09 kg / 59.73 pounds
27092.0 g / 265.8 N
10 mm Stal (~0.2) 20.47 kg / 45.12 pounds
20468.0 g / 200.8 N
15 mm Stal (~0.2) 14.89 kg / 32.84 pounds
14894.0 g / 146.1 N
20 mm Stal (~0.2) 10.56 kg / 23.28 pounds
10558.0 g / 103.6 N
30 mm Stal (~0.2) 5.11 kg / 11.26 pounds
5106.0 g / 50.1 N
50 mm Stal (~0.2) 1.22 kg / 2.69 pounds
1222.0 g / 12.0 N
The table below calculates the approximate weight limit required to start the shifting of the magnet vertically on a vertical metal surface (considering standard friction coefficient). The holding force is relative to the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 80x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
51.19 kg / 112.86 pounds
51192.0 g / 502.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
34.13 kg / 75.24 pounds
34128.0 g / 334.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
17.06 kg / 37.62 pounds
17064.0 g / 167.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
85.32 kg / 188.10 pounds
85320.0 g / 837.0 N
When placing a holder on a vertical wall (e.g., a fridge), it will only hold just approx. 20%-30% of nominal attraction strength. Gravity and a weak degree of grip cause that magnets slide down faster than they detach. Want to create a wall mount? Note that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a significantly smaller load. Application of an anti-slip pad can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 80x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 5.69 kg / 12.54 pounds
5688.0 g / 55.8 N
1 mm
8%
 14.22 kg / 31.35 pounds
14220.0 g / 139.5 N
2 mm
17%
 28.44 kg / 62.70 pounds
28440.0 g / 279.0 N
3 mm
25%
 42.66 kg / 94.05 pounds
42660.0 g / 418.5 N
5 mm
42%
 71.10 kg / 156.75 pounds
71100.0 g / 697.5 N
10 mm
83%
 142.20 kg / 313.50 pounds
142200.0 g / 1395.0 N
11 mm
92%
 156.42 kg / 344.85 pounds
156420.0 g / 1534.5 N
12 mm
100%
 170.64 kg / 376.20 pounds
170640.0 g / 1674.0 N
A thin metal plate is incapable of absorb the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To squeeze 100% of this magnet's power, you need a suitably thick backing of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the magnet works worse. We advise picking the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - power drop
MW 80x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 170.64 kg / 376.20 pounds
170640.0 g / 1674.0 N
 OK
40 °C -2.2% 166.89 kg / 367.92 pounds
166885.9 g / 1637.2 N
 OK
60 °C -4.4% 163.13 kg / 359.64 pounds
163131.8 g / 1600.3 N
80 °C -6.6% 159.38 kg / 351.37 pounds
159377.8 g / 1563.5 N
100 °C -28.8% 121.50 kg / 267.85 pounds
121495.7 g / 1191.9 N
Classic neodymiums change their properties power past the thermal threshold. Watch out for overheating – heat can permanently demagnetize this product. With increasing heat, the neodymium's power momentarily lowers. Refrain from using this magnet near heat sources exceeding its working range. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently under lower heat stress compared to rod magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MW 80x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 428.66 kg / 945.03 pounds
5 157 Gs
64.30 kg / 141.76 pounds
64299 g / 630.8 N
 N/A
1 mm 420.08 kg / 926.12 pounds
7 364 Gs
63.01 kg / 138.92 pounds
63012 g / 618.1 N
 378.07 kg / 833.51 pounds
~0 Gs
2 mm 411.26 kg / 906.68 pounds
7 286 Gs
61.69 kg / 136.00 pounds
61690 g / 605.2 N
 370.14 kg / 816.01 pounds
~0 Gs
3 mm 402.40 kg / 887.15 pounds
7 207 Gs
60.36 kg / 133.07 pounds
60360 g / 592.1 N
 362.16 kg / 798.43 pounds
~0 Gs
5 mm 384.60 kg / 847.90 pounds
7 046 Gs
57.69 kg / 127.19 pounds
57690 g / 565.9 N
 346.14 kg / 763.11 pounds
~0 Gs
10 mm 340.28 kg / 750.18 pounds
6 627 Gs
51.04 kg / 112.53 pounds
51042 g / 500.7 N
 306.25 kg / 675.17 pounds
~0 Gs
20 mm 257.09 kg / 566.80 pounds
5 761 Gs
38.56 kg / 85.02 pounds
38564 g / 378.3 N
 231.38 kg / 510.12 pounds
~0 Gs
50 mm 92.55 kg / 204.04 pounds
3 456 Gs
13.88 kg / 30.61 pounds
13883 g / 136.2 N
 83.30 kg / 183.63 pounds
~0 Gs
60 mm 64.14 kg / 141.41 pounds
2 877 Gs
9.62 kg / 21.21 pounds
9622 g / 94.4 N
 57.73 kg / 127.27 pounds
~0 Gs
70 mm 44.44 kg / 97.98 pounds
2 395 Gs
6.67 kg / 14.70 pounds
6666 g / 65.4 N
 40.00 kg / 88.18 pounds
~0 Gs
80 mm 30.93 kg / 68.19 pounds
1 998 Gs
4.64 kg / 10.23 pounds
4639 g / 45.5 N
 27.84 kg / 61.37 pounds
~0 Gs
90 mm 21.69 kg / 47.82 pounds
1 673 Gs
3.25 kg / 7.17 pounds
3254 g / 31.9 N
 19.52 kg / 43.04 pounds
~0 Gs
100 mm 15.36 kg / 33.87 pounds
1 408 Gs
2.30 kg / 5.08 pounds
2304 g / 22.6 N
 13.83 kg / 30.48 pounds
~0 Gs
Two magnets interact from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of performance. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is huge. The levitation is a bit weaker than the attraction, but still impressive.
*The magnetic induction in repulsion mode drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
* Calculations apply to friction force of a pair of same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MW 80x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 37.5 cm
Hearing aid 10 Gs (1.0 mT) 29.5 cm
Mechanical watch 20 Gs (2.0 mT) 23.0 cm
Mobile device 40 Gs (4.0 mT) 18.0 cm
Remote 50 Gs (5.0 mT) 16.5 cm
Payment card 400 Gs (40.0 mT) 7.0 cm
HDD hard drive 600 Gs (60.0 mT) 5.5 cm
Powerful magnet radiation poses a serious hazard to IT equipment and medical implants. These NdFeB products produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MW 80x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.39 km/h
(4.55 m/s)
 11.72 J
30 mm 23.38 km/h
(6.49 m/s)
 23.85 J
50 mm 28.31 km/h
(7.86 m/s)
 34.98 J
100 mm 39.22 km/h
(10.90 m/s)
 67.13 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
MW 80x30 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 80x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 194 600 Mx 1946.0 µWb
Pc Coefficient 0.48 Low (Flat)
Flux value emitted by the magnet pole. Key data when building generators as well as sensors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
MW 80x30 / N38

Environment Effective steel pull Effect
Air (land) 170.64 kg Standard
Water (riverbed) 195.38 kg
(+24.74 kg buoyancy gain)
+14.5%
Rust risk: 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. Shear force

*Warning: On a vertical wall, the magnet holds only a fraction of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Power loss vs temp

*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) = 0.48

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%
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: 010100-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
Simply complete a single box, and the tool fill in the rest for you.

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The presented product is an incredibly powerful rod magnet, composed of advanced NdFeB material, which, at dimensions of Ø80x30 mm, guarantees maximum efficiency. This specific item features a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 170.64 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 1673.99 N with a weight of only 1130.97 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 80.1 mm) using two-component epoxy glues. 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 suitable for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø80x30), 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 80 mm and height 30 mm. The value of 1673.99 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1130.97 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 30 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Pros and cons of Nd2Fe14B magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
  • They are resistant to demagnetization induced by external disturbances,
  • By covering with a reflective layer of silver, the element has an aesthetic look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of accurate shaping and adapting to individual applications,
  • Significant place in electronics industry – they serve a role in magnetic memories, motor assemblies, diagnostic systems, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, 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 suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of creating nuts in the magnet and complicated forms - recommended is casing - magnet mounting.
  • Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products are able to complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum magnetic pulling force – what contributes to it?

The load parameter shown represents the peak performance, recorded under ideal test conditions, specifically:
  • using a sheet made of high-permeability steel, acting as a circuit closing element
  • whose thickness reaches at least 10 mm
  • with a surface perfectly flat
  • with total lack of distance (without impurities)
  • under axial force vector (90-degree angle)
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity results from a number of factors, listed from the most important:
  • Clearance – the presence of foreign body (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be lost into the air.
  • Plate material – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Medical implants

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.

This is not a toy

Strictly store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and use protective gear.

Crushing risk

Big blocks can break fingers instantly. Never put your hand between two strong magnets.

Fire risk

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Safe operation

Be careful. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can react.

Eye protection

NdFeB magnets are ceramic materials, which means they are very brittle. Collision of two magnets leads to them cracking into small pieces.

GPS Danger

Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.

Electronic hazard

Very strong magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Permanent damage

Do not overheat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?