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MW 30x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010056

GTIN/EAN: 5906301810551

5.00

Diameter Ø

30 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

26.51 g

Magnetization Direction

↑ axial

Load capacity

8.71 kg / 85.42 N

Magnetic Induction

196.02 mT / 1960 Gs

Coating

[NiCuNi] Nickel

check technical data »

8.35 ZŁ with VAT / pcs + price for transport

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Technical - MW 30x5 / N38 - cylindrical magnet

Specification / characteristics - MW 30x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010056
GTIN/EAN 5906301810551
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 30 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 26.51 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.71 kg / 85.42 N
Magnetic Induction ~ ? 196.02 mT / 1960 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 30x5 / 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 - report

The following data are the result of a physical analysis. Results are based on models for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a reference point for designers.

Table 1: Static force (force vs gap) - interaction chart
MW 30x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1960 Gs
196.0 mT
 8.71 kg / 19.20 LBS
8710.0 g / 85.4 N
 strong
1 mm 1890 Gs
189.0 mT
 8.10 kg / 17.86 LBS
8100.7 g / 79.5 N
 strong
2 mm 1802 Gs
180.2 mT
 7.37 kg / 16.24 LBS
7366.2 g / 72.3 N
 strong
3 mm 1702 Gs
170.2 mT
 6.57 kg / 14.47 LBS
6565.7 g / 64.4 N
 strong
5 mm 1479 Gs
147.9 mT
 4.96 kg / 10.93 LBS
4956.4 g / 48.6 N
 strong
10 mm 945 Gs
94.5 mT
 2.02 kg / 4.46 LBS
2024.4 g / 19.9 N
 strong
15 mm 576 Gs
57.6 mT
 0.75 kg / 1.66 LBS
752.1 g / 7.4 N
 weak grip
20 mm 356 Gs
35.6 mT
 0.29 kg / 0.64 LBS
288.1 g / 2.8 N
 weak grip
30 mm 153 Gs
15.3 mT
 0.05 kg / 0.12 LBS
53.2 g / 0.5 N
 weak grip
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.01 LBS
4.2 g / 0.0 N
 weak grip
Magnetic force drops drastically with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., dirt, paint, rust) strongly weakens the grip. Magnetic products hold optimally during direct contact; gap kills the power. Observe how flashily the parameters plummet, when the product does not adhere directly to the steel surface. When calculating the assembly, discard redundant distances.

Table 2: Sliding capacity (wall)
MW 30x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.74 kg / 3.84 LBS
1742.0 g / 17.1 N
1 mm Stal (~0.2) 1.62 kg / 3.57 LBS
1620.0 g / 15.9 N
2 mm Stal (~0.2) 1.47 kg / 3.25 LBS
1474.0 g / 14.5 N
3 mm Stal (~0.2) 1.31 kg / 2.90 LBS
1314.0 g / 12.9 N
5 mm Stal (~0.2) 0.99 kg / 2.19 LBS
992.0 g / 9.7 N
10 mm Stal (~0.2) 0.40 kg / 0.89 LBS
404.0 g / 4.0 N
15 mm Stal (~0.2) 0.15 kg / 0.33 LBS
150.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 LBS
58.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data presents the approximate shear load required to initiate the shifting of the magnet vertically against a vertical metal surface (considering standard friction). This value is relative to the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 30x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.61 kg / 5.76 LBS
2613.0 g / 25.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.74 kg / 3.84 LBS
1742.0 g / 17.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.87 kg / 1.92 LBS
871.0 g / 8.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.36 kg / 9.60 LBS
4355.0 g / 42.7 N
When mounting a magnet on a upright surface (e.g., a car body), it will maintain barely about 20%-30% of its maximum pull force. Gravity and a weak degree of grip influence the fact that products slide down easier than they pull off. Want to create a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will slide down under a significantly smaller cargo. Application of an anti-slip coating can effectively improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 30x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.87 kg / 1.92 LBS
871.0 g / 8.5 N
1 mm
25%
 2.18 kg / 4.80 LBS
2177.5 g / 21.4 N
2 mm
50%
 4.36 kg / 9.60 LBS
4355.0 g / 42.7 N
3 mm
75%
 6.53 kg / 14.40 LBS
6532.5 g / 64.1 N
5 mm
100%
 8.71 kg / 19.20 LBS
8710.0 g / 85.4 N
10 mm
100%
 8.71 kg / 19.20 LBS
8710.0 g / 85.4 N
11 mm
100%
 8.71 kg / 19.20 LBS
8710.0 g / 85.4 N
12 mm
100%
 8.71 kg / 19.20 LBS
8710.0 g / 85.4 N
A too thin steel is incapable of focus the full magnetic flux, which squanders power of the holder. Should you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's power, you require a sufficiently solid piece of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder holds weaker. We advise picking the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - thermal limit
MW 30x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.71 kg / 19.20 LBS
8710.0 g / 85.4 N
 OK
40 °C -2.2% 8.52 kg / 18.78 LBS
8518.4 g / 83.6 N
 OK
60 °C -4.4% 8.33 kg / 18.36 LBS
8326.8 g / 81.7 N
80 °C -6.6% 8.14 kg / 17.93 LBS
8135.1 g / 79.8 N
100 °C -28.8% 6.20 kg / 13.67 LBS
6201.5 g / 60.8 N
Ordinary NdFeB products change their properties strength past the thermal threshold. Watch out for overheating – heat can irreversibly destroy this product. With every degree above norm, the neodymium's capacity temporarily drops. Refrain from using this magnet near heat sources exceeding its safe range. Exceeding the critical threshold will result in destruction of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties sooner than long magnets. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MW 30x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 16.74 kg / 36.91 LBS
3 437 Gs
2.51 kg / 5.54 LBS
2511 g / 24.6 N
 N/A
1 mm 16.20 kg / 35.71 LBS
3 856 Gs
2.43 kg / 5.36 LBS
2429 g / 23.8 N
 14.58 kg / 32.14 LBS
~0 Gs
2 mm 15.57 kg / 34.33 LBS
3 780 Gs
2.34 kg / 5.15 LBS
2335 g / 22.9 N
 14.01 kg / 30.89 LBS
~0 Gs
3 mm 14.89 kg / 32.82 LBS
3 696 Gs
2.23 kg / 4.92 LBS
2233 g / 21.9 N
 13.40 kg / 29.54 LBS
~0 Gs
5 mm 13.40 kg / 29.54 LBS
3 507 Gs
2.01 kg / 4.43 LBS
2010 g / 19.7 N
 12.06 kg / 26.58 LBS
~0 Gs
10 mm 9.53 kg / 21.00 LBS
2 957 Gs
1.43 kg / 3.15 LBS
1429 g / 14.0 N
 8.57 kg / 18.90 LBS
~0 Gs
20 mm 3.89 kg / 8.58 LBS
1 890 Gs
0.58 kg / 1.29 LBS
584 g / 5.7 N
 3.50 kg / 7.72 LBS
~0 Gs
50 mm 0.23 kg / 0.50 LBS
458 Gs
0.03 kg / 0.08 LBS
34 g / 0.3 N
 0.21 kg / 0.45 LBS
~0 Gs
60 mm 0.10 kg / 0.23 LBS
307 Gs
0.02 kg / 0.03 LBS
15 g / 0.2 N
 0.09 kg / 0.20 LBS
~0 Gs
70 mm 0.05 kg / 0.11 LBS
213 Gs
0.01 kg / 0.02 LBS
7 g / 0.1 N
 0.04 kg / 0.10 LBS
~0 Gs
80 mm 0.03 kg / 0.06 LBS
153 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
90 mm 0.01 kg / 0.03 LBS
113 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
100 mm 0.01 kg / 0.02 LBS
86 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and steel combination. The connection of magnet-to-magnet produces a massive flux and a further horizon of action. Want to build a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is massive. The levitation is marginally weaker than the attraction, but still significant.
*Flux density for N-N configuration reaches ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Results apply to shear force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - precautionary measures
MW 30x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a real danger to electronics and pacemakers. These NdFeB products generate a field that destroys function of sensitive medical devices. Notice: the unseen radiation acts through matter and glass. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MW 30x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.77 km/h
(5.77 m/s)
 0.44 J
30 mm 31.78 km/h
(8.83 m/s)
 1.03 J
50 mm 40.89 km/h
(11.36 m/s)
 1.71 J
100 mm 57.81 km/h
(16.06 m/s)
 3.42 J
Magnetic elements are prone to chipping – a strong collision with metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when working with large magnets.

Table 9: Coating parameters (durability)
MW 30x5 / 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 following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 30x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 658 Mx 166.6 µWb
Pc Coefficient 0.25 Low (Flat)
Flux value passing through the pole surface. Essential parameter for generator designers and motors. Pc value defines the working geometry.

Table 11: Submerged application
MW 30x5 / N38

Environment Effective steel pull Effect
Air (land) 8.71 kg Standard
Water (riverbed) 9.97 kg
(+1.26 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. 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 merely ~20% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25

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%
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: 010056-2026
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This product is an exceptionally strong cylinder magnet, manufactured from durable NdFeB material, which, with dimensions of Ø30x5 mm, guarantees optimal power. This specific item boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 8.71 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard 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 positioning or actuating element. Thanks to the pull force of 85.42 N with a weight of only 26.51 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 30.1 mm) using two-component epoxy glues. To ensure long-term durability 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 a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø30x5), 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 30 mm and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 8.71 kg (force ~85.42 N), which, with such compact dimensions, proves the high grade of the NdFeB material. 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 5 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths and weaknesses of neodymium magnets.

Benefits

Apart from their consistent power, neodymium magnets have these key benefits:
  • They retain magnetic properties for around 10 years – the drop is just ~1% (in theory),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • A magnet with a shiny silver surface is more attractive,
  • Magnets possess very high magnetic induction on the outer side,
  • 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...
  • Possibility of detailed creating and optimizing to concrete applications,
  • Versatile presence in innovative solutions – they find application in HDD drives, electric motors, advanced medical instruments, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complex forms - preferred is cover - magnet mounting.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Detachment force of the magnet in optimal conditions – what it depends on?

Information about lifting capacity is the result of a measurement for ideal contact conditions, taking into account:
  • using a plate made of low-carbon steel, serving as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • with a plane cleaned and smooth
  • without any insulating layer between the magnet and steel
  • under axial force vector (90-degree angle)
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Effective lifting capacity is influenced by working environment parameters, including (from most important):
  • Air gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Powerful field

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Permanent damage

Avoid heat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Dust is flammable

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Crushing risk

Large magnets can break fingers instantly. Never put your hand betwixt two strong magnets.

Life threat

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

Sensitization to coating

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. If you have an allergy, prevent direct skin contact and opt for encased magnets.

Fragile material

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.

Do not give to children

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

Cards and drives

Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, timepieces).

Threat to navigation

Note: neodymium magnets generate a field that disrupts precision electronics. Maintain a separation from your mobile, tablet, and GPS.

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