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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

see technical specifications »

136.80 ZŁ with VAT / pcs + price for transport

111.22 ZŁ net + 23% VAT / pcs

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Detailed specification - 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

Physical simulation of the magnet - data

Presented values represent the direct effect of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - power drop
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
 dangerous!
1 mm 4742 Gs
474.2 mT
 63.55 kg / 140.11 lbs
63553.9 g / 623.5 N
 dangerous!
2 mm 4523 Gs
452.3 mT
 57.81 kg / 127.44 lbs
57805.8 g / 567.1 N
 dangerous!
3 mm 4303 Gs
430.3 mT
 52.33 kg / 115.36 lbs
52327.7 g / 513.3 N
 dangerous!
5 mm 3870 Gs
387.0 mT
 42.33 kg / 93.32 lbs
42329.9 g / 415.3 N
 dangerous!
10 mm 2886 Gs
288.6 mT
 23.53 kg / 51.88 lbs
23531.8 g / 230.8 N
 dangerous!
15 mm 2106 Gs
210.6 mT
 12.54 kg / 27.64 lbs
12537.0 g / 123.0 N
 dangerous!
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
 safe
Magnetic force drops drastically with every mm of spacing. Remember that even the smallest gap (e.g., contamination, paint, rust) strongly weakens the grip. Magnets work strongest during direct contact; gap kills the force. Analyze how rapidly the parameters drop, when the magnet does not adhere flatly to the metal substrate. When designing the arrangement, eliminate unnecessary gaps.

Table 2: Sliding capacity (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 indicates the estimated weight limit sufficient to cause the shifting of the magnet downwards against a upright metal surface (assuming typical friction coefficient). This parameter is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 hanging a magnet on a upright plane (e.g., a car body), it will maintain barely approx. 20%-30% of its maximum pull force. Gravity and a weak degree of grip mean that products slide down easier than they pull off. Planning a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slide down under a much lighter cargo. Using a rubber pad can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
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 too thin steel is unable to focus the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid backing of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - power drop
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. Watch out for overheating – excessive heat can permanently demagnetize this product. With increasing heat, the magnet's capacity momentarily decreases. Refrain from using this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 45x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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 strong neodymiums attract each other from a wider radius than a magnet and sheet combination. The connection of magnet-to-magnet produces a massive flux and a larger range of operation. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is huge. The repulsion force is slightly lower than the attraction, but still impressive.
*Field value between like poles is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Attention: Results demonstrate sliding force of two same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
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 real danger to electronics as well as pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

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
Neodymium magnets are delicate – a strong collision with metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Surface protection spec
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. Moisture resistance is crucial for installations in bathrooms or outdoors.

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

Parameter Value SI Unit / Description
Magnetic Flux 79 446 Mx 794.5 µWb
Pc Coefficient 0.71 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For N38 grade, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
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%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010073-2026
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8.61 ZŁ brutto / pcs
The presented product is an exceptionally strong cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø45x30 mm, guarantees the highest energy density. The MW 45x30 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 69.46 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. 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 low weight is crucial.
Due to the delicate structure of the ceramic sinter, 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 do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio 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 available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 30 mm. The key parameter here is the holding force amounting to approximately 69.46 kg (force ~681.39 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 30 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 through the diameter if your project requires it.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after around ten years it drops only by ~1% (according to research),
  • They retain their magnetic properties even under external field action,
  • By applying a decorative layer of silver, the element has an nice look,
  • Magnetic induction on the working part of the magnet is very high,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in forming and the capacity to modify to complex applications,
  • Significant place in innovative solutions – they are utilized in computer drives, motor assemblies, precision medical tools, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in compact constructions

Disadvantages

Problematic aspects of neodymium magnets: application proposals
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited ability of making threads in the magnet and complex shapes - recommended is cover - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

Information about lifting capacity was determined for ideal contact conditions, taking into account:
  • using a base made of mild steel, functioning as a circuit closing element
  • whose transverse dimension reaches at least 10 mm
  • characterized by lack of roughness
  • without any air gap between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

What influences lifting capacity in practice

Holding efficiency is influenced by specific conditions, mainly (from priority):
  • Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Direction of force – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • 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.
  • Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet and the plate reduces the holding force.

H&S for magnets
Swallowing risk

Neodymium magnets are not toys. Swallowing several magnets may result in them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.

Skin irritation risks

It is widely known that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands and opt for versions in plastic housing.

Do not underestimate power

Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can react.

Operating temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Flammability

Fire warning: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Finger safety

Large magnets can break fingers instantly. Under no circumstances place your hand between two attracting surfaces.

Beware of splinters

Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

GPS Danger

A powerful magnetic field interferes with the operation of compasses in smartphones and navigation systems. Do not bring magnets near a device to prevent damaging the sensors.

Electronic devices

Intense magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Danger to pacemakers

People with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.

Security! Learn more about risks in the article: Magnet Safety Guide.