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MW 45x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010073

GTIN/EAN: 5906301810728

Diameter Ø

45 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

357.85 g

Magnetization Direction

↑ axial

Load capacity

69.46 kg / 681.39 N

Magnetic Induction

495.87 mT / 4959 Gs

Coating

[NiCuNi] Nickel

technical details »

136.80 ZŁ with VAT / pcs + price for transport

111.22 ZŁ net + 23% VAT / pcs

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Product card - MW 45x30 / N38 - cylindrical magnet

Specification / characteristics - MW 45x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010073
GTIN/EAN 5906301810728
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 30 mm [±0,1 mm]
Weight 357.85 g
Magnetization Direction ↑ axial
Load capacity ~ ? 69.46 kg / 681.39 N
Magnetic Induction ~ ? 495.87 mT / 4959 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x30 / 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 magnet - report

Presented data constitute the direct effect of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - characteristics
MW 45x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4958 Gs
495.8 mT
 69.46 kg / 153.13 LBS
69460.0 g / 681.4 N
 critical level
1 mm 4742 Gs
474.2 mT
 63.55 kg / 140.11 LBS
63553.9 g / 623.5 N
 critical level
2 mm 4523 Gs
452.3 mT
 57.81 kg / 127.44 LBS
57805.8 g / 567.1 N
 critical level
3 mm 4303 Gs
430.3 mT
 52.33 kg / 115.36 LBS
52327.7 g / 513.3 N
 critical level
5 mm 3870 Gs
387.0 mT
 42.33 kg / 93.32 LBS
42329.9 g / 415.3 N
 critical level
10 mm 2886 Gs
288.6 mT
 23.53 kg / 51.88 LBS
23531.8 g / 230.8 N
 critical level
15 mm 2106 Gs
210.6 mT
 12.54 kg / 27.64 LBS
12537.0 g / 123.0 N
 critical level
20 mm 1535 Gs
153.5 mT
 6.66 kg / 14.68 LBS
6657.1 g / 65.3 N
 warning
30 mm 845 Gs
84.5 mT
 2.02 kg / 4.45 LBS
2018.9 g / 19.8 N
 warning
50 mm 315 Gs
31.5 mT
 0.28 kg / 0.62 LBS
279.5 g / 2.7 N
 low risk
Grip strength weakens significantly with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., contamination, paint, veneer) strongly diminishes the holding power. Magnets operate most effectively at the point of direct contact; air break drastically cuts the power. Notice how quickly the parameters fall, when the magnet does not adhere tightly to the metal substrate. When designing the mounting, discard additional spacers.

Table 2: Shear hold (vertical surface)
MW 45x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 13.89 kg / 30.63 LBS
13892.0 g / 136.3 N
1 mm Stal (~0.2) 12.71 kg / 28.02 LBS
12710.0 g / 124.7 N
2 mm Stal (~0.2) 11.56 kg / 25.49 LBS
11562.0 g / 113.4 N
3 mm Stal (~0.2) 10.47 kg / 23.07 LBS
10466.0 g / 102.7 N
5 mm Stal (~0.2) 8.47 kg / 18.66 LBS
8466.0 g / 83.1 N
10 mm Stal (~0.2) 4.71 kg / 10.37 LBS
4706.0 g / 46.2 N
15 mm Stal (~0.2) 2.51 kg / 5.53 LBS
2508.0 g / 24.6 N
20 mm Stal (~0.2) 1.33 kg / 2.94 LBS
1332.0 g / 13.1 N
30 mm Stal (~0.2) 0.40 kg / 0.89 LBS
404.0 g / 4.0 N
50 mm Stal (~0.2) 0.06 kg / 0.12 LBS
56.0 g / 0.5 N
The table below presents the theoretical weight limit required to cause the slippage of the magnet down against a vertical metal surface (assuming typical friction). This value depends on the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MW 45x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
20.84 kg / 45.94 LBS
20838.0 g / 204.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.89 kg / 30.63 LBS
13892.0 g / 136.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.95 kg / 15.31 LBS
6946.0 g / 68.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
34.73 kg / 76.57 LBS
34730.0 g / 340.7 N
When mounting a holder on a vertical plane (e.g., a car body), it will only hold only about 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient cause that magnets move down faster than they detach. Planning a wall mount? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a significantly smaller cargo. Using a rubber pad can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 45x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.32 kg / 5.10 LBS
2315.3 g / 22.7 N
1 mm
8%
 5.79 kg / 12.76 LBS
5788.3 g / 56.8 N
2 mm
17%
 11.58 kg / 25.52 LBS
11576.7 g / 113.6 N
3 mm
25%
 17.37 kg / 38.28 LBS
17365.0 g / 170.4 N
5 mm
42%
 28.94 kg / 63.81 LBS
28941.7 g / 283.9 N
10 mm
83%
 57.88 kg / 127.61 LBS
57883.3 g / 567.8 N
11 mm
92%
 63.67 kg / 140.37 LBS
63671.7 g / 624.6 N
12 mm
100%
 69.46 kg / 153.13 LBS
69460.0 g / 681.4 N
A thin metal plate is unable to absorb the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a thin surface, the flux will pass right through and the attraction force will be weaker. To achieve full efficiency of this neodymium's power, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the product works worse. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - thermal limit
MW 45x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 69.46 kg / 153.13 LBS
69460.0 g / 681.4 N
 OK
40 °C -2.2% 67.93 kg / 149.76 LBS
67931.9 g / 666.4 N
 OK
60 °C -4.4% 66.40 kg / 146.40 LBS
66403.8 g / 651.4 N
 OK
80 °C -6.6% 64.88 kg / 143.03 LBS
64875.6 g / 636.4 N
100 °C -28.8% 49.46 kg / 109.03 LBS
49455.5 g / 485.2 N
Ordinary NdFeB products change their properties parameters past the thermal threshold. Protect against heat – heat can permanently destroy this product. With increasing heat, the magnet's force briefly lowers. Refrain from using this product near heat sources exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently at lower temperatures than long magnets. The danger warning in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 45x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 241.01 kg / 531.33 LBS
5 803 Gs
36.15 kg / 79.70 LBS
36151 g / 354.6 N
 N/A
1 mm 230.79 kg / 508.80 LBS
9 703 Gs
34.62 kg / 76.32 LBS
34618 g / 339.6 N
 207.71 kg / 457.92 LBS
~0 Gs
2 mm 220.52 kg / 486.16 LBS
9 485 Gs
33.08 kg / 72.92 LBS
33078 g / 324.5 N
 198.47 kg / 437.54 LBS
~0 Gs
3 mm 210.44 kg / 463.94 LBS
9 265 Gs
31.57 kg / 69.59 LBS
31566 g / 309.7 N
 189.39 kg / 417.54 LBS
~0 Gs
5 mm 190.94 kg / 420.95 LBS
8 826 Gs
28.64 kg / 63.14 LBS
28641 g / 281.0 N
 171.85 kg / 378.86 LBS
~0 Gs
10 mm 146.87 kg / 323.80 LBS
7 741 Gs
22.03 kg / 48.57 LBS
22031 g / 216.1 N
 132.19 kg / 291.42 LBS
~0 Gs
20 mm 81.65 kg / 180.01 LBS
5 771 Gs
12.25 kg / 27.00 LBS
12247 g / 120.1 N
 73.48 kg / 162.01 LBS
~0 Gs
50 mm 12.52 kg / 27.60 LBS
2 260 Gs
1.88 kg / 4.14 LBS
1878 g / 18.4 N
 11.27 kg / 24.84 LBS
~0 Gs
60 mm 7.01 kg / 15.44 LBS
1 690 Gs
1.05 kg / 2.32 LBS
1051 g / 10.3 N
 6.30 kg / 13.90 LBS
~0 Gs
70 mm 4.06 kg / 8.95 LBS
1 287 Gs
0.61 kg / 1.34 LBS
609 g / 6.0 N
 3.66 kg / 8.06 LBS
~0 Gs
80 mm 2.44 kg / 5.38 LBS
998 Gs
0.37 kg / 0.81 LBS
366 g / 3.6 N
 2.20 kg / 4.84 LBS
~0 Gs
90 mm 1.51 kg / 3.34 LBS
786 Gs
0.23 kg / 0.50 LBS
227 g / 2.2 N
 1.36 kg / 3.01 LBS
~0 Gs
100 mm 0.97 kg / 2.14 LBS
629 Gs
0.15 kg / 0.32 LBS
145 g / 1.4 N
 0.87 kg / 1.92 LBS
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. The setup of two magnets generates a stronger field and a wider radius of performance. Want to build a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is massive. The levitation is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Figures refer to sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 45x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 25.5 cm
Hearing aid 10 Gs (1.0 mT) 20.0 cm
Timepiece 20 Gs (2.0 mT) 15.5 cm
Mobile device 40 Gs (4.0 mT) 12.0 cm
Car key 50 Gs (5.0 mT) 11.0 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 4.0 cm
Extremely neodym field poses a serious hazard to electronics and medical implants. These magnets generate a flux that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field acts through matter and housings. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MW 45x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.76 km/h
(4.66 m/s)
 3.88 J
30 mm 24.77 km/h
(6.88 m/s)
 8.47 J
50 mm 31.50 km/h
(8.75 m/s)
 13.70 J
100 mm 44.44 km/h
(12.34 m/s)
 27.26 J
NdFeB products are very brittle – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when working with large magnets.

Table 9: Coating parameters (durability)
MW 45x30 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MW 45x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 79 446 Mx 794.5 µWb
Pc Coefficient 0.71 High (Stable)
Flux value emitted by the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MW 45x30 / N38

Environment Effective steel pull Effect
Air (land) 69.46 kg Standard
Water (riverbed) 79.53 kg
(+10.07 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. Buoyancy helps in lifting finds.
1. Wall mount (shear)

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Temperature resistance

*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) = 0.71

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 and environmental data
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: 010073-2026
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The offered product is an incredibly powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø45x30 mm, guarantees maximum efficiency. This specific item is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 69.46 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 681.39 N with a weight of only 357.85 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 45.1 mm) using two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability 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 (Ø45x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø45x30 mm, which, at a weight of 357.85 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 69.46 kg (force ~681.39 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 45 mm. 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.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • Their strength is maintained, and after around ten years it decreases only by ~1% (according to research),
  • They are resistant to demagnetization induced by external disturbances,
  • By applying a lustrous coating of silver, the element acquires an proper look,
  • Magnets possess very high magnetic induction on the active area,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
  • In view of the possibility of flexible molding and adaptation to specialized projects, magnetic components can be produced in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Significant place in future technologies – they are used in HDD drives, electric drive systems, medical equipment, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Cons of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mount.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

Breakaway force was determined for ideal contact conditions, taking into account:
  • with the use of a sheet made of special test steel, ensuring maximum field concentration
  • whose thickness reaches at least 10 mm
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in neutral thermal conditions

What influences lifting capacity in practice

Real force impacted by specific conditions, including (from most important):
  • Clearance – existence of foreign body (rust, dirt, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Phone sensors

Navigation devices and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Flammability

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

ICD Warning

Patients with a pacemaker must keep an large gap from magnets. The magnetism can interfere with the functioning of the implant.

Physical harm

Danger of trauma: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Safe distance

Intense magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Sensitization to coating

Some people suffer from a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Frequent touching can result in dermatitis. We strongly advise wear safety gloves.

Conscious usage

Handle with care. Rare earth magnets act from a distance and connect with huge force, often faster than you can move away.

Magnets are brittle

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

No play value

Product intended for adults. Small elements can be swallowed, leading to serious injuries. Store away from kids and pets.

Heat sensitivity

Avoid heat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Danger! Need more info? Check our post: Are neodymium magnets dangerous?