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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

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415.00 ZŁ with VAT / pcs + price for transport

337.40 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Engineering analysis of the product - technical parameters

These data represent the direct effect of a mathematical calculation. Values rely on models for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
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 lbs
170640.0 g / 1674.0 N
 crushing
1 mm 3643 Gs
364.3 mT
 163.71 kg / 360.93 lbs
163714.9 g / 1606.0 N
 crushing
2 mm 3563 Gs
356.3 mT
 156.65 kg / 345.35 lbs
156647.8 g / 1536.7 N
 crushing
3 mm 3482 Gs
348.2 mT
 149.55 kg / 329.71 lbs
149554.1 g / 1467.1 N
 crushing
5 mm 3314 Gs
331.4 mT
 135.46 kg / 298.63 lbs
135457.0 g / 1328.8 N
 crushing
10 mm 2880 Gs
288.0 mT
 102.34 kg / 225.63 lbs
102343.3 g / 1004.0 N
 crushing
15 mm 2457 Gs
245.7 mT
 74.47 kg / 164.17 lbs
74468.4 g / 730.5 N
 crushing
20 mm 2069 Gs
206.9 mT
 52.79 kg / 116.38 lbs
52789.9 g / 517.9 N
 crushing
30 mm 1439 Gs
143.9 mT
 25.53 kg / 56.29 lbs
25534.0 g / 250.5 N
 crushing
50 mm 704 Gs
70.4 mT
 6.11 kg / 13.48 lbs
6115.0 g / 60.0 N
 medium risk
Magnetic force decreases significantly per each millimeter of distance. Note that even a microscopic distance (e.g., contamination, varnish, veneer) significantly weakens the grip. Magnets operate optimally in perfect adhesion; distance kills the force. Observe how rapidly the parameters drop, when the magnet does not adhere tightly to the steel surface. When calculating the arrangement, eliminate additional spacers.

Table 2: Slippage force (vertical surface)
MW 80x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 34.13 kg / 75.24 lbs
34128.0 g / 334.8 N
1 mm Stal (~0.2) 32.74 kg / 72.18 lbs
32742.0 g / 321.2 N
2 mm Stal (~0.2) 31.33 kg / 69.07 lbs
31330.0 g / 307.3 N
3 mm Stal (~0.2) 29.91 kg / 65.94 lbs
29910.0 g / 293.4 N
5 mm Stal (~0.2) 27.09 kg / 59.73 lbs
27092.0 g / 265.8 N
10 mm Stal (~0.2) 20.47 kg / 45.12 lbs
20468.0 g / 200.8 N
15 mm Stal (~0.2) 14.89 kg / 32.84 lbs
14894.0 g / 146.1 N
20 mm Stal (~0.2) 10.56 kg / 23.28 lbs
10558.0 g / 103.6 N
30 mm Stal (~0.2) 5.11 kg / 11.26 lbs
5106.0 g / 50.1 N
50 mm Stal (~0.2) 1.22 kg / 2.69 lbs
1222.0 g / 12.0 N
The following data indicates the theoretical holding capacity necessary to cause the downward movement of the magnet vertically on a vertical steel plate (considering typical friction). The holding force varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
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 lbs
51192.0 g / 502.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
34.13 kg / 75.24 lbs
34128.0 g / 334.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
17.06 kg / 37.62 lbs
17064.0 g / 167.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
85.32 kg / 188.10 lbs
85320.0 g / 837.0 N
When hanging a element on a vertical wall (e.g., a car body), it will only hold only approx. 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient mean that products slip faster than they pop off the substrate. Designing a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a much lighter load. Using a rubber layer can effectively improve the result.

Table 4: Steel thickness (saturation) - 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 lbs
5688.0 g / 55.8 N
1 mm
8%
 14.22 kg / 31.35 lbs
14220.0 g / 139.5 N
2 mm
17%
 28.44 kg / 62.70 lbs
28440.0 g / 279.0 N
3 mm
25%
 42.66 kg / 94.05 lbs
42660.0 g / 418.5 N
5 mm
42%
 71.10 kg / 156.75 lbs
71100.0 g / 697.5 N
10 mm
83%
 142.20 kg / 313.50 lbs
142200.0 g / 1395.0 N
11 mm
92%
 156.42 kg / 344.85 lbs
156420.0 g / 1534.5 N
12 mm
100%
 170.64 kg / 376.20 lbs
170640.0 g / 1674.0 N
A thin metal plate is incapable of absorb the entire magnetic field, which squanders power of the holder. Should you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's potential, you need a suitably thick backing of steel. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We advise picking the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - resistance threshold
MW 80x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 170.64 kg / 376.20 lbs
170640.0 g / 1674.0 N
 OK
40 °C -2.2% 166.89 kg / 367.92 lbs
166885.9 g / 1637.2 N
 OK
60 °C -4.4% 163.13 kg / 359.64 lbs
163131.8 g / 1600.3 N
80 °C -6.6% 159.38 kg / 351.37 lbs
159377.8 g / 1563.5 N
100 °C -28.8% 121.50 kg / 267.85 lbs
121495.7 g / 1191.9 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Avoid high temperatures – heat can irreversibly destroy this magnet. With increasing heat, the magnet's capacity momentarily drops. Avoid using this product near heat sources exceeding its operating temperature limit. Too high temperature will result in permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MW 80x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 428.66 kg / 945.03 lbs
5 157 Gs
64.30 kg / 141.76 lbs
64299 g / 630.8 N
 N/A
1 mm 420.08 kg / 926.12 lbs
7 364 Gs
63.01 kg / 138.92 lbs
63012 g / 618.1 N
 378.07 kg / 833.51 lbs
~0 Gs
2 mm 411.26 kg / 906.68 lbs
7 286 Gs
61.69 kg / 136.00 lbs
61690 g / 605.2 N
 370.14 kg / 816.01 lbs
~0 Gs
3 mm 402.40 kg / 887.15 lbs
7 207 Gs
60.36 kg / 133.07 lbs
60360 g / 592.1 N
 362.16 kg / 798.43 lbs
~0 Gs
5 mm 384.60 kg / 847.90 lbs
7 046 Gs
57.69 kg / 127.19 lbs
57690 g / 565.9 N
 346.14 kg / 763.11 lbs
~0 Gs
10 mm 340.28 kg / 750.18 lbs
6 627 Gs
51.04 kg / 112.53 lbs
51042 g / 500.7 N
 306.25 kg / 675.17 lbs
~0 Gs
20 mm 257.09 kg / 566.80 lbs
5 761 Gs
38.56 kg / 85.02 lbs
38564 g / 378.3 N
 231.38 kg / 510.12 lbs
~0 Gs
50 mm 92.55 kg / 204.04 lbs
3 456 Gs
13.88 kg / 30.61 lbs
13883 g / 136.2 N
 83.30 kg / 183.63 lbs
~0 Gs
60 mm 64.14 kg / 141.41 lbs
2 877 Gs
9.62 kg / 21.21 lbs
9622 g / 94.4 N
 57.73 kg / 127.27 lbs
~0 Gs
70 mm 44.44 kg / 97.98 lbs
2 395 Gs
6.67 kg / 14.70 lbs
6666 g / 65.4 N
 40.00 kg / 88.18 lbs
~0 Gs
80 mm 30.93 kg / 68.19 lbs
1 998 Gs
4.64 kg / 10.23 lbs
4639 g / 45.5 N
 27.84 kg / 61.37 lbs
~0 Gs
90 mm 21.69 kg / 47.82 lbs
1 673 Gs
3.25 kg / 7.17 lbs
3254 g / 31.9 N
 19.52 kg / 43.04 lbs
~0 Gs
100 mm 15.36 kg / 33.87 lbs
1 408 Gs
2.30 kg / 5.08 lbs
2304 g / 22.6 N
 13.83 kg / 30.48 lbs
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and steel setup. The connection of two magnets creates a more powerful interaction and a further horizon of operation. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still large.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Note: Estimates refer to shear force of dual matching 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
Timepiece 20 Gs (2.0 mT) 23.0 cm
Mobile device 40 Gs (4.0 mT) 18.0 cm
Car key 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
Extremely neodym field is a large risk to IT equipment and pacemakers. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and housings. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
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
Neodymium magnets are very brittle – a collision with steel causes immediate chipping. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can trigger coating fragments or injury to fingers. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when playing with powerful specimens.

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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. 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)
Total magnetic flux passing through the pole surface. Essential parameter when building generators as well as sensors. Pc value defines the working geometry.

Table 11: Submerged application
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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.

Technical specification and ecology
Chemical composition
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: 010100-2026
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The presented product is an extremely powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø80x30 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 170.64 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 1673.99 N with a weight of only 1130.97 g, this rod is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need the strongest 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 store.
This model is characterized by dimensions Ø80x30 mm, which, at a weight of 1130.97 g, makes it an element with impressive magnetic energy density. 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 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 and cons of Nd2Fe14B magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their power is maintained, and after around 10 years it drops only by ~1% (according to research),
  • Magnets very well protect themselves against demagnetization caused by foreign field sources,
  • Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
  • Neodymium magnets create maximum magnetic induction on a their surface, which allows for strong attraction,
  • 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 versatility in shaping and the ability to customize to unusual requirements,
  • Significant place in electronics industry – they serve a role in hard drives, electric motors, diagnostic systems, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complicated shapes in magnets, we recommend using casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these products can complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is higher than average,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The lifting capacity listed is a result of laboratory testing conducted under standard conditions:
  • using a plate made of high-permeability steel, serving as a magnetic yoke
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface free of scratches
  • without any air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature

Determinants of practical lifting force of a magnet

Effective lifting capacity impacted by specific conditions, mainly (from priority):
  • Clearance – existence of foreign body (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Magnet fragility

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Electronic hazard

Intense magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Dust explosion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness appears, cease working with magnets and use protective gear.

Keep away from children

Only for adults. Tiny parts pose a choking risk, causing severe trauma. Keep out of reach of children and animals.

Operating temperature

Do not overheat. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Caution required

Exercise caution. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can react.

Compass and GPS

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Warning for heart patients

For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Crushing force

Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Attention! Need more info? Check our post: Why are neodymium magnets dangerous?