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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 properties »

65.93 ZŁ with VAT / pcs + price for transport

53.60 ZŁ net + 23% VAT / pcs

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Technical details - 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

Technical simulation of the assembly - technical parameters

The following information represent the direct effect of a engineering calculation. Results rely on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - characteristics
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
 dangerous!
1 mm 3563 Gs
356.3 mT
 39.16 kg / 86.33 lbs
39159.5 g / 384.2 N
 dangerous!
2 mm 3398 Gs
339.8 mT
 35.62 kg / 78.52 lbs
35617.1 g / 349.4 N
 dangerous!
3 mm 3228 Gs
322.8 mT
 32.13 kg / 70.84 lbs
32130.5 g / 315.2 N
 dangerous!
5 mm 2880 Gs
288.0 mT
 25.58 kg / 56.40 lbs
25584.2 g / 251.0 N
 dangerous!
10 mm 2069 Gs
206.9 mT
 13.20 kg / 29.09 lbs
13196.7 g / 129.5 N
 dangerous!
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
 safe
50 mm 169 Gs
16.9 mT
 0.09 kg / 0.19 lbs
88.4 g / 0.9 N
 safe
Grip strength weakens drastically with every mm of distance. Keep in mind that even a very thin break (e.g., dirt, varnish, dust) noticeably reduces the pull force. Magnets work strongest during direct contact; gap drastically cuts the force. Observe how flashily the pull force fall, when the magnet does not adhere tightly to the metal substrate. When planning the assembly, discard redundant distances.

Table 2: Vertical capacity (wall)
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
The table below shows the theoretical force sufficient to initiate the shifting of the magnet downwards against a vertical steel plate (considering typical friction coefficient). This value varies with the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 placing a magnet on a upright wall (e.g., a fridge), it you can count on barely approx. 1/5 of nominal attraction strength. Gravity and a weak degree of grip mean that magnets slide down faster than they detach. Planning a vertical fastening? Remember that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller load. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Material efficiency (saturation) - 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 thin sheet is incapable of conduct the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a thin surface, the flux will pass right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's power, you require a sufficiently solid backing of steel. The saturation effect causes that on delicate walls (e.g., thin profiles), the holder works worse. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
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 change their properties strength above the temperature limit. Protect against heat – excessive heat can irreversibly damage this product. With increasing heat, the neodymium's capacity briefly drops. Do not use this magnet close to ovens exceeding its working range. Too high temperature will result in irreversible degradation of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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 magnetic products interact from a significantly greater distance than a neodymium and metal setup. The connection of two magnets generates a stronger field and a further horizon of action. Want to build a strong closure? Utilize two neodymiums instead of one magnet and a steel. Remember that when bringing together two magnets, the collision energy is extreme. The repulsion force is slightly lower than the connection force, but still large.
*Field value for N-N configuration drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
Note: Figures demonstrate friction force of dual matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (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
Mobile device 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
Extremely neodym field is a real danger to IT equipment as well as pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
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
Neodymium magnets are very brittle – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MW 40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 48 650 Mx 486.5 µWb
Pc Coefficient 0.48 Low (Flat)
Flux value passing through the pole surface. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
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. Buoyancy helps in lifting finds.
1. Shear force

*Note: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces 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) = 0.48

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
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%
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: 010067-2026
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This product is an exceptionally strong rod magnet, produced from advanced NdFeB material, which, at dimensions of Ø40x15 mm, guarantees optimal power. The MW 40x15 / N38 model features high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 42.64 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, 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 perfect for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 418.33 N with a weight of only 141.37 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. 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 in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 40 mm and height 15 mm. The value of 418.33 N means that the magnet is capable of holding a weight many times exceeding its own mass of 141.37 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet 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 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 rare earth magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose strength, even during approximately ten years – the decrease in lifting capacity is only ~1% (based on measurements),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • By covering with a reflective coating of silver, the element has an professional look,
  • Neodymium magnets create maximum magnetic induction on a small area, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • In view of the potential of free forming and adaptation to custom solutions, neodymium magnets can be created in a variety of forms and dimensions, which amplifies use scope,
  • Significant place in advanced technology sectors – they serve a role in data components, drive modules, advanced medical instruments, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions

Disadvantages

What to avoid - cons of neodymium magnets and proposals for their use:
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend 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 prevent oxidation and corrosion.
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in stable room temperature

Lifting capacity in real conditions – factors

In practice, the actual holding force is determined by a number of factors, listed from the most important:
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Sensitization to coating

Studies show that nickel (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact and select coated magnets.

Medical interference

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Electronic hazard

Do not bring magnets near a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Thermal limits

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Combustion hazard

Drilling and cutting of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Swallowing risk

Absolutely keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are tragic.

Respect the power

Be careful. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can react.

Bone fractures

Big blocks can crush fingers instantly. Never place your hand between two strong magnets.

Shattering risk

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Keep away from electronics

Navigation devices and smartphones are highly sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Important! Learn more about risks in the article: Safety of working with magnets.