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MW 45x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010070

GTIN/EAN: 5906301810698

5.00

Diameter Ø

45 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

178.92 g

Magnetization Direction

↑ axial

Load capacity

48.55 kg / 476.32 N

Magnetic Induction

343.84 mT / 3438 Gs

Coating

[NiCuNi] Nickel

view technical data »

61.84 ZŁ with VAT / pcs + price for transport

50.28 ZŁ net + 23% VAT / pcs

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Technical details - MW 45x15 / N38 - cylindrical magnet

Specification / characteristics - MW 45x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010070
GTIN/EAN 5906301810698
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 45 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 178.92 g
Magnetization Direction ↑ axial
Load capacity ~ ? 48.55 kg / 476.32 N
Magnetic Induction ~ ? 343.84 mT / 3438 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x15 / 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 simulation of the assembly - technical parameters

Presented values constitute the result of a engineering analysis. Values were calculated on algorithms for the material Nd2Fe14B. Actual conditions might slightly differ. Treat these data as a reference point for designers.

Table 1: Static force (pull vs distance) - interaction chart
MW 45x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3438 Gs
343.8 mT
 48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
 critical level
1 mm 3318 Gs
331.8 mT
 45.21 kg / 99.68 pounds
45214.3 g / 443.6 N
 critical level
2 mm 3189 Gs
318.9 mT
 41.76 kg / 92.07 pounds
41762.8 g / 409.7 N
 critical level
3 mm 3054 Gs
305.4 mT
 38.30 kg / 84.44 pounds
38303.2 g / 375.8 N
 critical level
5 mm 2774 Gs
277.4 mT
 31.61 kg / 69.69 pounds
31610.0 g / 310.1 N
 critical level
10 mm 2090 Gs
209.0 mT
 17.95 kg / 39.57 pounds
17948.5 g / 176.1 N
 critical level
15 mm 1521 Gs
152.1 mT
 9.50 kg / 20.95 pounds
9500.8 g / 93.2 N
 warning
20 mm 1096 Gs
109.6 mT
 4.94 kg / 10.88 pounds
4936.3 g / 48.4 N
 warning
30 mm 585 Gs
58.5 mT
 1.41 kg / 3.10 pounds
1407.9 g / 13.8 N
 low risk
50 mm 205 Gs
20.5 mT
 0.17 kg / 0.38 pounds
172.6 g / 1.7 N
 low risk
Magnetic force decreases significantly with every mm of distance. Remember that even a microscopic distance (e.g., dirt, varnish, dust) significantly reduces the pull force. Magnets operate strongest during direct contact; air break weakens the power. Notice how rapidly the load capacity plummet, when the product does not adhere tightly to the steel surface. When designing the arrangement, avoid unnecessary gaps.

Table 2: Shear force (vertical surface)
MW 45x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 9.71 kg / 21.41 pounds
9710.0 g / 95.3 N
1 mm Stal (~0.2) 9.04 kg / 19.93 pounds
9042.0 g / 88.7 N
2 mm Stal (~0.2) 8.35 kg / 18.41 pounds
8352.0 g / 81.9 N
3 mm Stal (~0.2) 7.66 kg / 16.89 pounds
7660.0 g / 75.1 N
5 mm Stal (~0.2) 6.32 kg / 13.94 pounds
6322.0 g / 62.0 N
10 mm Stal (~0.2) 3.59 kg / 7.91 pounds
3590.0 g / 35.2 N
15 mm Stal (~0.2) 1.90 kg / 4.19 pounds
1900.0 g / 18.6 N
20 mm Stal (~0.2) 0.99 kg / 2.18 pounds
988.0 g / 9.7 N
30 mm Stal (~0.2) 0.28 kg / 0.62 pounds
282.0 g / 2.8 N
50 mm Stal (~0.2) 0.03 kg / 0.07 pounds
34.0 g / 0.3 N
This section indicates the theoretical weight limit needed to cause the sliding of the magnet down against a vertical steel plate (considering typical friction). This parameter is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 45x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
14.56 kg / 32.11 pounds
14565.0 g / 142.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
9.71 kg / 21.41 pounds
9710.0 g / 95.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.86 kg / 10.70 pounds
4855.0 g / 47.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
24.28 kg / 53.52 pounds
24275.0 g / 238.1 N
When hanging a element on a vertical wall (e.g., a board), it will only hold only about 1/5 of its nominal power. Gravity and a weak degree of grip influence the fact that products move down faster than they pop off the substrate. Planning a vertical fastening? Consider that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the holder will give way down under a noticeably lighter cargo. Application of an anti-slip pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 45x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 2.43 kg / 5.35 pounds
2427.5 g / 23.8 N
1 mm
13%
 6.07 kg / 13.38 pounds
6068.8 g / 59.5 N
2 mm
25%
 12.14 kg / 26.76 pounds
12137.5 g / 119.1 N
3 mm
38%
 18.21 kg / 40.14 pounds
18206.2 g / 178.6 N
5 mm
63%
 30.34 kg / 66.90 pounds
30343.8 g / 297.7 N
10 mm
100%
 48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
11 mm
100%
 48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
12 mm
100%
 48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
A thin sheet is incapable of focus the full magnetic flux, which weakens actual performance of the holder. If you attach a powerful product to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To achieve full efficiency of this neodymium's potential, you need a suitably thick piece of metal. The saturation effect means that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 45x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
 OK
40 °C -2.2% 47.48 kg / 104.68 pounds
47481.9 g / 465.8 N
 OK
60 °C -4.4% 46.41 kg / 102.32 pounds
46413.8 g / 455.3 N
80 °C -6.6% 45.35 kg / 99.97 pounds
45345.7 g / 444.8 N
100 °C -28.8% 34.57 kg / 76.21 pounds
34567.6 g / 339.1 N
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Protect against heat – high temperature can permanently destroy this product. With every degree above norm, the neodymium's capacity temporarily decreases. Do not use this product in hot environments exceeding its operating temperature limit. Ignoring the limit will result in destruction of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 45x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 115.89 kg / 255.50 pounds
4 958 Gs
17.38 kg / 38.32 pounds
17384 g / 170.5 N
 N/A
1 mm 111.99 kg / 246.89 pounds
6 759 Gs
16.80 kg / 37.03 pounds
16798 g / 164.8 N
 100.79 kg / 222.20 pounds
~0 Gs
2 mm 107.93 kg / 237.94 pounds
6 636 Gs
16.19 kg / 35.69 pounds
16189 g / 158.8 N
 97.14 kg / 214.15 pounds
~0 Gs
3 mm 103.82 kg / 228.89 pounds
6 508 Gs
15.57 kg / 34.33 pounds
15573 g / 152.8 N
 93.44 kg / 206.00 pounds
~0 Gs
5 mm 95.55 kg / 210.66 pounds
6 244 Gs
14.33 kg / 31.60 pounds
14333 g / 140.6 N
 86.00 kg / 189.59 pounds
~0 Gs
10 mm 75.46 kg / 166.35 pounds
5 548 Gs
11.32 kg / 24.95 pounds
11318 g / 111.0 N
 67.91 kg / 149.72 pounds
~0 Gs
20 mm 42.84 kg / 94.46 pounds
4 181 Gs
6.43 kg / 14.17 pounds
6427 g / 63.0 N
 38.56 kg / 85.01 pounds
~0 Gs
50 mm 6.20 kg / 13.67 pounds
1 591 Gs
0.93 kg / 2.05 pounds
930 g / 9.1 N
 5.58 kg / 12.31 pounds
~0 Gs
60 mm 3.36 kg / 7.41 pounds
1 171 Gs
0.50 kg / 1.11 pounds
504 g / 4.9 N
 3.02 kg / 6.67 pounds
~0 Gs
70 mm 1.89 kg / 4.16 pounds
877 Gs
0.28 kg / 0.62 pounds
283 g / 2.8 N
 1.70 kg / 3.74 pounds
~0 Gs
80 mm 1.10 kg / 2.42 pounds
669 Gs
0.16 kg / 0.36 pounds
165 g / 1.6 N
 0.99 kg / 2.18 pounds
~0 Gs
90 mm 0.66 kg / 1.46 pounds
520 Gs
0.10 kg / 0.22 pounds
99 g / 1.0 N
 0.60 kg / 1.31 pounds
~0 Gs
100 mm 0.41 kg / 0.91 pounds
410 Gs
0.06 kg / 0.14 pounds
62 g / 0.6 N
 0.37 kg / 0.82 pounds
~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 larger range of performance. Want to build a strong closure? Apply two magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Results demonstrate sliding force of a pair of matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 45x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 20.5 cm
Hearing aid 10 Gs (1.0 mT) 16.0 cm
Mechanical watch 20 Gs (2.0 mT) 12.5 cm
Mobile device 40 Gs (4.0 mT) 10.0 cm
Car key 50 Gs (5.0 mT) 9.0 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Extremely neodym field is a large risk to electronic devices as well as pacemakers. These neodymiums produce a flux that destroys function of digital equipment. Notice: the unseen radiation passes through tissues and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MW 45x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.09 km/h
(5.58 m/s)
 2.79 J
30 mm 29.29 km/h
(8.14 m/s)
 5.92 J
50 mm 37.23 km/h
(10.34 m/s)
 9.57 J
100 mm 52.54 km/h
(14.59 m/s)
 19.05 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or injury to skin. Be sure to control the product during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 45x15 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MW 45x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 57 854 Mx 578.5 µWb
Pc Coefficient 0.44 Low (Flat)
Flux value passing through the pole surface. Essential parameter when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MW 45x15 / N38

Environment Effective steel pull Effect
Air (land) 48.55 kg Standard
Water (riverbed) 55.59 kg
(+7.04 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

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

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly 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) = 0.44

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
Material specification
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: 010070-2026
Magnet Unit Converter
Force (pull)
Magnetic Induction
Type a value into any field, and the remaining units will recalculate instantly.

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The presented product is a very strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø45x15 mm, guarantees maximum efficiency. This specific item boasts 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. 48.55 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 476.32 N with a weight of only 178.92 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø45x15), 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 45 mm and height 15 mm. The value of 476.32 N means that the magnet is capable of holding a weight many times exceeding its own mass of 178.92 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 15 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 diametrically if your project requires it.

Advantages and disadvantages of neodymium magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • They maintain their magnetic properties even under external field action,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to look better,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • In view of the possibility of free forming and customization to individualized solutions, magnetic components can be produced in a variety of geometric configurations, which increases their versatility,
  • Fundamental importance in innovative solutions – they are commonly used in data components, electromotive mechanisms, advanced medical instruments, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these products can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

The declared magnet strength refers to the limit force, measured under optimal environment, specifically:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • whose thickness is min. 10 mm
  • with a plane cleaned and smooth
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Holding efficiency is affected by working environment parameters, such as (from most important):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content decrease magnetic permeability and holding force.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
Dust is flammable

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Do not give to children

Always keep magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are very dangerous.

Nickel allergy

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or choose versions in plastic housing.

Finger safety

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

Cards and drives

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Beware of splinters

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

Precision electronics

Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Medical interference

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Handling rules

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Demagnetization risk

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.

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