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MW 40x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010067

GTIN/EAN: 5906301810667

Diameter Ø

40 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

141.37 g

Magnetization Direction

↑ axial

Load capacity

42.64 kg / 418.33 N

Magnetic Induction

371.91 mT / 3719 Gs

Coating

[NiCuNi] Nickel

check specifications »

65.93 ZŁ with VAT / pcs + price for transport

53.60 ZŁ net + 23% VAT / pcs

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Technical data - MW 40x15 / N38 - cylindrical magnet

Specification / characteristics - MW 40x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010067
GTIN/EAN 5906301810667
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 40 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 141.37 g
Magnetization Direction ↑ axial
Load capacity ~ ? 42.64 kg / 418.33 N
Magnetic Induction ~ ? 371.91 mT / 3719 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x15 / 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 modeling of the product - report

These values represent the direct effect of a physical simulation. Results are based on algorithms for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - power drop
MW 40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3718 Gs
371.8 mT
 42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
 crushing
1 mm 3563 Gs
356.3 mT
 39.16 kg / 86.33 LBS
39159.5 g / 384.2 N
 crushing
2 mm 3398 Gs
339.8 mT
 35.62 kg / 78.52 LBS
35617.1 g / 349.4 N
 crushing
3 mm 3228 Gs
322.8 mT
 32.13 kg / 70.84 LBS
32130.5 g / 315.2 N
 crushing
5 mm 2880 Gs
288.0 mT
 25.58 kg / 56.40 LBS
25584.2 g / 251.0 N
 crushing
10 mm 2069 Gs
206.9 mT
 13.20 kg / 29.09 LBS
13196.7 g / 129.5 N
 crushing
15 mm 1439 Gs
143.9 mT
 6.38 kg / 14.07 LBS
6383.1 g / 62.6 N
 strong
20 mm 999 Gs
99.9 mT
 3.08 kg / 6.79 LBS
3077.9 g / 30.2 N
 strong
30 mm 507 Gs
50.7 mT
 0.79 kg / 1.75 LBS
792.4 g / 7.8 N
 weak grip
50 mm 169 Gs
16.9 mT
 0.09 kg / 0.19 LBS
88.4 g / 0.9 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of gap. Remember that every additional insulation layer (e.g., dirt, paint, rust) significantly weakens the grip. Neodymiums operate optimally at the point of direct contact; distance nullifies the force. Notice how rapidly the parameters fall, when the product does not adhere tightly to the metal substrate. When planning the arrangement, avoid unnecessary gaps.

Table 2: Shear force (vertical surface)
MW 40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.53 kg / 18.80 LBS
8528.0 g / 83.7 N
1 mm Stal (~0.2) 7.83 kg / 17.27 LBS
7832.0 g / 76.8 N
2 mm Stal (~0.2) 7.12 kg / 15.71 LBS
7124.0 g / 69.9 N
3 mm Stal (~0.2) 6.43 kg / 14.17 LBS
6426.0 g / 63.0 N
5 mm Stal (~0.2) 5.12 kg / 11.28 LBS
5116.0 g / 50.2 N
10 mm Stal (~0.2) 2.64 kg / 5.82 LBS
2640.0 g / 25.9 N
15 mm Stal (~0.2) 1.28 kg / 2.81 LBS
1276.0 g / 12.5 N
20 mm Stal (~0.2) 0.62 kg / 1.36 LBS
616.0 g / 6.0 N
30 mm Stal (~0.2) 0.16 kg / 0.35 LBS
158.0 g / 1.5 N
50 mm Stal (~0.2) 0.02 kg / 0.04 LBS
18.0 g / 0.2 N
This section indicates the estimated force necessary to cause the shifting of the magnet vertically against a vertical steel wall (considering standard friction). This value depends on the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MW 40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.79 kg / 28.20 LBS
12792.0 g / 125.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.53 kg / 18.80 LBS
8528.0 g / 83.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.26 kg / 9.40 LBS
4264.0 g / 41.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.32 kg / 47.00 LBS
21320.0 g / 209.1 N
When hanging a magnet on a vertical wall (e.g., a fridge), it you can count on only approx. 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip mean that products move down easier than they pull off. Planning a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a noticeably lighter load. Utilizing a rubberized coating can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 2.13 kg / 4.70 LBS
2132.0 g / 20.9 N
1 mm
13%
 5.33 kg / 11.75 LBS
5330.0 g / 52.3 N
2 mm
25%
 10.66 kg / 23.50 LBS
10660.0 g / 104.6 N
3 mm
38%
 15.99 kg / 35.25 LBS
15990.0 g / 156.9 N
5 mm
63%
 26.65 kg / 58.75 LBS
26650.0 g / 261.4 N
10 mm
100%
 42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
11 mm
100%
 42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
12 mm
100%
 42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
A too thin steel is unable to take in the full magnetic flux, which weakens actual performance of the magnet. Should you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To achieve the maximum of this neodymium's potential, you require a sufficiently solid backing of steel. The material oversaturation means that on thin elements (e.g., car bodies), the holder works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MW 40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.64 kg / 94.00 LBS
42640.0 g / 418.3 N
 OK
40 °C -2.2% 41.70 kg / 91.94 LBS
41701.9 g / 409.1 N
 OK
60 °C -4.4% 40.76 kg / 89.87 LBS
40763.8 g / 399.9 N
80 °C -6.6% 39.83 kg / 87.80 LBS
39825.8 g / 390.7 N
100 °C -28.8% 30.36 kg / 66.93 LBS
30359.7 g / 297.8 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this magnet. As the temperature rises, the neodymium's force briefly lowers. Refrain from using this magnet near heat sources exceeding its safe range. Too high temperature will cause permanent loss of magnetism.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MW 40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 107.12 kg / 236.16 LBS
5 156 Gs
16.07 kg / 35.42 LBS
16068 g / 157.6 N
 N/A
1 mm 102.82 kg / 226.67 LBS
7 286 Gs
15.42 kg / 34.00 LBS
15422 g / 151.3 N
 92.53 kg / 204.00 LBS
~0 Gs
2 mm 98.38 kg / 216.89 LBS
7 127 Gs
14.76 kg / 32.53 LBS
14757 g / 144.8 N
 88.54 kg / 195.20 LBS
~0 Gs
3 mm 93.92 kg / 207.06 LBS
6 964 Gs
14.09 kg / 31.06 LBS
14088 g / 138.2 N
 84.53 kg / 186.36 LBS
~0 Gs
5 mm 85.07 kg / 187.55 LBS
6 627 Gs
12.76 kg / 28.13 LBS
12760 g / 125.2 N
 76.56 kg / 168.79 LBS
~0 Gs
10 mm 64.27 kg / 141.70 LBS
5 761 Gs
9.64 kg / 21.25 LBS
9641 g / 94.6 N
 57.85 kg / 127.53 LBS
~0 Gs
20 mm 33.15 kg / 73.09 LBS
4 137 Gs
4.97 kg / 10.96 LBS
4973 g / 48.8 N
 29.84 kg / 65.78 LBS
~0 Gs
50 mm 3.84 kg / 8.47 LBS
1 408 Gs
0.58 kg / 1.27 LBS
576 g / 5.7 N
 3.46 kg / 7.62 LBS
~0 Gs
60 mm 1.99 kg / 4.39 LBS
1 014 Gs
0.30 kg / 0.66 LBS
299 g / 2.9 N
 1.79 kg / 3.95 LBS
~0 Gs
70 mm 1.08 kg / 2.38 LBS
747 Gs
0.16 kg / 0.36 LBS
162 g / 1.6 N
 0.97 kg / 2.14 LBS
~0 Gs
80 mm 0.61 kg / 1.35 LBS
563 Gs
0.09 kg / 0.20 LBS
92 g / 0.9 N
 0.55 kg / 1.22 LBS
~0 Gs
90 mm 0.36 kg / 0.80 LBS
432 Gs
0.05 kg / 0.12 LBS
54 g / 0.5 N
 0.33 kg / 0.72 LBS
~0 Gs
100 mm 0.22 kg / 0.49 LBS
339 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.44 LBS
~0 Gs
Two magnets attract each other from a much further distance than a neodymium and metal setup. Such a system of two magnets generates a stronger field and a wider radius of performance. Planning to create a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the impact force is extreme. The levitation is a bit weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).
Important: Calculations apply to shear force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MW 40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.0 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Timepiece 20 Gs (2.0 mT) 11.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Car key 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Powerful magnet radiation poses a real danger to electronic devices and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Notice: the unseen radiation acts through matter and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MW 40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.63 km/h
(5.73 m/s)
 2.32 J
30 mm 30.69 km/h
(8.52 m/s)
 5.14 J
50 mm 39.22 km/h
(10.89 m/s)
 8.39 J
100 mm 55.39 km/h
(15.39 m/s)
 16.73 J
Magnetic elements are delicate – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or painful pinches to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Surface protection spec
MW 40x15 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MW 40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 48 650 Mx 486.5 µWb
Pc Coefficient 0.48 Low (Flat)
Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. Pc value defines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 40x15 / N38

Environment Effective steel pull Effect
Air (land) 42.64 kg Standard
Water (riverbed) 48.82 kg
(+6.18 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. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

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

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Thermal stability

*For N38 material, 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

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
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%
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: 010067-2026
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This product is an exceptionally strong cylindrical magnet, manufactured from durable NdFeB material, which, at dimensions of Ø40x15 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 42.64 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 418.33 N with a weight of only 141.37 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, anaerobic resins are used, which are safe for nickel 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 (Ø40x15), 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 40 mm and height 15 mm. The key parameter here is the lifting capacity amounting to approximately 42.64 kg (force ~418.33 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 15 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard 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 diametrically if your project requires it.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain magnetic properties for almost ten years – the drop is just ~1% (based on simulations),
  • They retain their magnetic properties even under close interference source,
  • A magnet with a smooth gold surface has an effective appearance,
  • Magnets exhibit impressive magnetic induction on the active area,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the ability of precise shaping and adaptation to specialized needs, NdFeB magnets can be created in a variety of forms and dimensions, which expands the range of possible applications,
  • Wide application in advanced technology sectors – they are utilized in HDD drives, electromotive mechanisms, medical devices, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Magnet power was determined for the most favorable conditions, including:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • whose thickness reaches at least 10 mm
  • with a surface cleaned and smooth
  • under conditions of no distance (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Holding efficiency impacted by specific conditions, including (from priority):
  • Distance (betwixt the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safe handling of neodymium magnets
Keep away from computers

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Do not drill into magnets

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Product not for children

Adult use only. Small elements pose a choking risk, causing severe trauma. Store out of reach of kids and pets.

Allergic reactions

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and use protective gear.

Material brittleness

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Threat to navigation

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Physical harm

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

Danger to pacemakers

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

Conscious usage

Be careful. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can move away.

Operating temperature

Control the heat. Exposing the magnet to high heat will destroy its properties and strength.

Important! Looking for details? Check our post: Are neodymium magnets dangerous?