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MW 55x25 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010081

GTIN/EAN: 5906301810803

5.00

Diameter Ø

55 mm [±0,1 mm]

Height

25 mm [±0,1 mm]

Weight

445.47 g

Magnetization Direction

↑ axial

Load capacity

92.25 kg / 904.94 N

Magnetic Induction

416.97 mT / 4170 Gs

Coating

[NiCuNi] Nickel

technical specifications »

154.21 ZŁ with VAT / pcs + price for transport

125.37 ZŁ net + 23% VAT / pcs

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Technical data of the product - MW 55x25 / N38 - cylindrical magnet

Specification / characteristics - MW 55x25 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010081
GTIN/EAN 5906301810803
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 55 mm [±0,1 mm]
Height 25 mm [±0,1 mm]
Weight 445.47 g
Magnetization Direction ↑ axial
Load capacity ~ ? 92.25 kg / 904.94 N
Magnetic Induction ~ ? 416.97 mT / 4170 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 55x25 / 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 magnet - technical parameters

These information constitute the outcome of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static force (pull vs gap) - characteristics
MW 55x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4169 Gs
416.9 mT
 92.25 kg / 203.38 LBS
92250.0 g / 905.0 N
 critical level
1 mm 4034 Gs
403.4 mT
 86.37 kg / 190.41 LBS
86369.8 g / 847.3 N
 critical level
2 mm 3894 Gs
389.4 mT
 80.47 kg / 177.41 LBS
80469.7 g / 789.4 N
 critical level
3 mm 3751 Gs
375.1 mT
 74.67 kg / 164.62 LBS
74670.6 g / 732.5 N
 critical level
5 mm 3461 Gs
346.1 mT
 63.58 kg / 140.17 LBS
63580.6 g / 623.7 N
 critical level
10 mm 2756 Gs
275.6 mT
 40.32 kg / 88.89 LBS
40320.8 g / 395.5 N
 critical level
15 mm 2140 Gs
214.0 mT
 24.31 kg / 53.59 LBS
24308.3 g / 238.5 N
 critical level
20 mm 1644 Gs
164.4 mT
 14.34 kg / 31.61 LBS
14338.1 g / 140.7 N
 critical level
30 mm 975 Gs
97.5 mT
 5.05 kg / 11.12 LBS
5046.0 g / 49.5 N
 medium risk
50 mm 388 Gs
38.8 mT
 0.80 kg / 1.77 LBS
801.0 g / 7.9 N
 weak grip
Magnetic force weakens drastically per each millimeter of spacing. Remember that every additional insulation layer (e.g., contamination, varnish, veneer) significantly reduces the pull force. Neodymiums work most effectively in perfect adhesion; air break drastically cuts the power. See how quickly the parameters fall, when the magnet does not adhere flatly to the metal substrate. When calculating the mounting, eliminate redundant distances.

Table 2: Vertical hold (wall)
MW 55x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 18.45 kg / 40.68 LBS
18450.0 g / 181.0 N
1 mm Stal (~0.2) 17.27 kg / 38.08 LBS
17274.0 g / 169.5 N
2 mm Stal (~0.2) 16.09 kg / 35.48 LBS
16094.0 g / 157.9 N
3 mm Stal (~0.2) 14.93 kg / 32.92 LBS
14934.0 g / 146.5 N
5 mm Stal (~0.2) 12.72 kg / 28.03 LBS
12716.0 g / 124.7 N
10 mm Stal (~0.2) 8.06 kg / 17.78 LBS
8064.0 g / 79.1 N
15 mm Stal (~0.2) 4.86 kg / 10.72 LBS
4862.0 g / 47.7 N
20 mm Stal (~0.2) 2.87 kg / 6.32 LBS
2868.0 g / 28.1 N
30 mm Stal (~0.2) 1.01 kg / 2.23 LBS
1010.0 g / 9.9 N
50 mm Stal (~0.2) 0.16 kg / 0.35 LBS
160.0 g / 1.6 N
The table below shows the estimated shear load needed to initiate the sliding of the magnet vertically along a upright metal surface (assuming standard friction coefficient). This parameter depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 55x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
27.68 kg / 61.01 LBS
27675.0 g / 271.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.45 kg / 40.68 LBS
18450.0 g / 181.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.23 kg / 20.34 LBS
9225.0 g / 90.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
46.13 kg / 101.69 LBS
46125.0 g / 452.5 N
When placing a magnet on a upright surface (e.g., a car body), it you can count on only approx. 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip mean that magnets slide down faster than they detach. Designing a vertical fastening? Note that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slip down under a significantly smaller cargo. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (saturation) - power losses
MW 55x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 3.08 kg / 6.78 LBS
3075.0 g / 30.2 N
1 mm
8%
 7.69 kg / 16.95 LBS
7687.5 g / 75.4 N
2 mm
17%
 15.37 kg / 33.90 LBS
15375.0 g / 150.8 N
3 mm
25%
 23.06 kg / 50.84 LBS
23062.5 g / 226.2 N
5 mm
42%
 38.44 kg / 84.74 LBS
38437.5 g / 377.1 N
10 mm
83%
 76.88 kg / 169.48 LBS
76875.0 g / 754.1 N
11 mm
92%
 84.56 kg / 186.43 LBS
84562.5 g / 829.6 N
12 mm
100%
 92.25 kg / 203.38 LBS
92250.0 g / 905.0 N
A thin metal plate is not enough to focus the entire magnetic field, which squanders power of the magnet. If you install a neodymium to a too thin substrate, the field will pass right through and the holding will be smaller. To utilize the maximum of this neodymium's power, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the product works worse. We advise picking the steel cross-section from these parameters.

Table 5: Working in heat (stability) - power drop
MW 55x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 92.25 kg / 203.38 LBS
92250.0 g / 905.0 N
 OK
40 °C -2.2% 90.22 kg / 198.90 LBS
90220.5 g / 885.1 N
 OK
60 °C -4.4% 88.19 kg / 194.43 LBS
88191.0 g / 865.2 N
80 °C -6.6% 86.16 kg / 189.95 LBS
86161.5 g / 845.2 N
100 °C -28.8% 65.68 kg / 144.80 LBS
65682.0 g / 644.3 N
Standard neodymium magnets change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the magnet's force momentarily lowers. Do not use this magnet close to heaters exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetism.
*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties sooner than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 55x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 254.60 kg / 561.30 LBS
5 431 Gs
38.19 kg / 84.20 LBS
38190 g / 374.6 N
 N/A
1 mm 246.57 kg / 543.59 LBS
8 206 Gs
36.99 kg / 81.54 LBS
36985 g / 362.8 N
 221.91 kg / 489.23 LBS
~0 Gs
2 mm 238.37 kg / 525.52 LBS
8 068 Gs
35.76 kg / 78.83 LBS
35756 g / 350.8 N
 214.54 kg / 472.97 LBS
~0 Gs
3 mm 230.21 kg / 507.52 LBS
7 929 Gs
34.53 kg / 76.13 LBS
34531 g / 338.7 N
 207.19 kg / 456.77 LBS
~0 Gs
5 mm 214.04 kg / 471.88 LBS
7 645 Gs
32.11 kg / 70.78 LBS
32106 g / 315.0 N
 192.64 kg / 424.69 LBS
~0 Gs
10 mm 175.48 kg / 386.86 LBS
6 923 Gs
26.32 kg / 58.03 LBS
26322 g / 258.2 N
 157.93 kg / 348.17 LBS
~0 Gs
20 mm 111.28 kg / 245.33 LBS
5 513 Gs
16.69 kg / 36.80 LBS
16692 g / 163.8 N
 100.15 kg / 220.80 LBS
~0 Gs
50 mm 23.33 kg / 51.43 LBS
2 524 Gs
3.50 kg / 7.71 LBS
3499 g / 34.3 N
 20.99 kg / 46.28 LBS
~0 Gs
60 mm 13.93 kg / 30.70 LBS
1 950 Gs
2.09 kg / 4.61 LBS
2089 g / 20.5 N
 12.53 kg / 27.63 LBS
~0 Gs
70 mm 8.48 kg / 18.70 LBS
1 522 Gs
1.27 kg / 2.81 LBS
1272 g / 12.5 N
 7.63 kg / 16.83 LBS
~0 Gs
80 mm 5.29 kg / 11.66 LBS
1 202 Gs
0.79 kg / 1.75 LBS
793 g / 7.8 N
 4.76 kg / 10.50 LBS
~0 Gs
90 mm 3.38 kg / 7.45 LBS
961 Gs
0.51 kg / 1.12 LBS
507 g / 5.0 N
 3.04 kg / 6.70 LBS
~0 Gs
100 mm 2.21 kg / 4.87 LBS
777 Gs
0.33 kg / 0.73 LBS
332 g / 3.3 N
 1.99 kg / 4.39 LBS
~0 Gs
Two magnets interact from a wider radius than a magnet and steel setup. The connection of two magnets produces a massive flux and a larger range of action. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The repulsion force is a bit weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint of the gap (resulting from vector opposition).
* Calculations apply to sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 55x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 27.5 cm
Hearing aid 10 Gs (1.0 mT) 21.5 cm
Timepiece 20 Gs (2.0 mT) 17.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 13.0 cm
Car key 50 Gs (5.0 mT) 12.0 cm
Payment card 400 Gs (40.0 mT) 5.0 cm
HDD hard drive 600 Gs (60.0 mT) 4.5 cm
Extremely neodym field is a real danger to electronics as well as medical implants. These NdFeB products produce a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and housings. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MW 55x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.05 km/h
(5.01 m/s)
 5.60 J
30 mm 25.98 km/h
(7.22 m/s)
 11.60 J
50 mm 32.63 km/h
(9.06 m/s)
 18.30 J
100 mm 45.90 km/h
(12.75 m/s)
 36.21 J
Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
MW 55x25 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MW 55x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 101 075 Mx 1010.7 µWb
Pc Coefficient 0.55 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Submerged application
MW 55x25 / N38

Environment Effective steel pull Effect
Air (land) 92.25 kg Standard
Water (riverbed) 105.63 kg
(+13.38 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains only a fraction of its max power.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.55

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.

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: 010081-2026
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The presented product is an extremely powerful rod magnet, composed of modern NdFeB material, which, at dimensions of Ø55x25 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 cylindrical magnet with impressive force (approx. 92.25 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 904.94 N with a weight of only 445.47 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., 55.1 mm) using two-component epoxy glues. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø55x25), 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 Ø55x25 mm, which, at a weight of 445.47 g, makes it an element with high magnetic energy density. The value of 904.94 N means that the magnet is capable of holding a weight many times exceeding its own mass of 445.47 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 25 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.

Advantages and disadvantages of neodymium magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets effectively defend themselves against demagnetization caused by ambient magnetic noise,
  • A magnet with a metallic 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 resistance, enabling operation at temperatures reaching 230°C and above...
  • Possibility of accurate modeling and modifying to complex requirements,
  • Universal use in high-tech industry – they are used in hard drives, electromotive mechanisms, medical devices, and modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum lifting capacity of the magnet – what affects it?

The declared magnet strength represents the maximum value, recorded under ideal test conditions, meaning:
  • on a block made of mild steel, perfectly concentrating the magnetic flux
  • whose thickness equals approx. 10 mm
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Bear in mind that the working load may be lower subject to the following factors, in order of importance:
  • Air gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted into the air.
  • Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
No play value

These products are not intended for children. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a direct threat to life and necessitates urgent medical intervention.

Threat to navigation

GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Metal Allergy

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

Beware of splinters

Neodymium magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them breaking into small pieces.

Thermal limits

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Respect the power

Use magnets consciously. Their huge power can surprise even professionals. Plan your moves and do not underestimate their force.

Magnetic media

Avoid bringing magnets near a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Fire warning

Powder generated during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Pacemakers

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Serious injuries

Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Caution! Details about risks in the article: Magnet Safety Guide.