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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 properties »

8.35 ZŁ with VAT / pcs + price for transport

6.79 ZŁ net + 23% VAT / pcs

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Give us a call +48 888 99 98 98 otherwise send us a note via request form the contact section.
Lifting power and structure of a neodymium magnet can be verified using our magnetic calculator.

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Detailed specification - 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 magnet - data

The following information constitute the outcome of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - power drop
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 pounds
8710.0 g / 85.4 N
 warning
1 mm 1890 Gs
189.0 mT
 8.10 kg / 17.86 pounds
8100.7 g / 79.5 N
 warning
2 mm 1802 Gs
180.2 mT
 7.37 kg / 16.24 pounds
7366.2 g / 72.3 N
 warning
3 mm 1702 Gs
170.2 mT
 6.57 kg / 14.47 pounds
6565.7 g / 64.4 N
 warning
5 mm 1479 Gs
147.9 mT
 4.96 kg / 10.93 pounds
4956.4 g / 48.6 N
 warning
10 mm 945 Gs
94.5 mT
 2.02 kg / 4.46 pounds
2024.4 g / 19.9 N
 warning
15 mm 576 Gs
57.6 mT
 0.75 kg / 1.66 pounds
752.1 g / 7.4 N
 weak grip
20 mm 356 Gs
35.6 mT
 0.29 kg / 0.64 pounds
288.1 g / 2.8 N
 weak grip
30 mm 153 Gs
15.3 mT
 0.05 kg / 0.12 pounds
53.2 g / 0.5 N
 weak grip
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.01 pounds
4.2 g / 0.0 N
 weak grip
Pulling power decreases drastically with every mm of gap. Remember that even a very thin break (e.g., dirt, paint, veneer) noticeably reduces the pull force. Magnetic products work strongest at the point of direct contact; distance weakens the force. See how rapidly the pull force fall, when the magnet does not touch tightly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Slippage capacity (vertical surface)
MW 30x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.74 kg / 3.84 pounds
1742.0 g / 17.1 N
1 mm Stal (~0.2) 1.62 kg / 3.57 pounds
1620.0 g / 15.9 N
2 mm Stal (~0.2) 1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
3 mm Stal (~0.2) 1.31 kg / 2.90 pounds
1314.0 g / 12.9 N
5 mm Stal (~0.2) 0.99 kg / 2.19 pounds
992.0 g / 9.7 N
10 mm Stal (~0.2) 0.40 kg / 0.89 pounds
404.0 g / 4.0 N
15 mm Stal (~0.2) 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data calculates the theoretical shear load sufficient to initiate the shifting of the magnet down against a vertical steel plate (considering typical friction coefficient). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 pounds
2613.0 g / 25.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.74 kg / 3.84 pounds
1742.0 g / 17.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.87 kg / 1.92 pounds
871.0 g / 8.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.36 kg / 9.60 pounds
4355.0 g / 42.7 N
When placing a magnet on a vertical surface (e.g., a car body), it you can count on just about 1/5 of its nominal power. Gravitational force and a low friction coefficient mean that holders slide down easier than they pull off. Designing a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slide down under a significantly smaller weight. Utilizing a rubberized coating can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 30x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.87 kg / 1.92 pounds
871.0 g / 8.5 N
1 mm
25%
 2.18 kg / 4.80 pounds
2177.5 g / 21.4 N
2 mm
50%
 4.36 kg / 9.60 pounds
4355.0 g / 42.7 N
3 mm
75%
 6.53 kg / 14.40 pounds
6532.5 g / 64.1 N
5 mm
100%
 8.71 kg / 19.20 pounds
8710.0 g / 85.4 N
10 mm
100%
 8.71 kg / 19.20 pounds
8710.0 g / 85.4 N
11 mm
100%
 8.71 kg / 19.20 pounds
8710.0 g / 85.4 N
12 mm
100%
 8.71 kg / 19.20 pounds
8710.0 g / 85.4 N
A thin metal plate is unable to focus the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect means that on sheet metal structures (e.g., car bodies), the holder works worse. We suggest choosing the steel cross-section 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 pounds
8710.0 g / 85.4 N
 OK
40 °C -2.2% 8.52 kg / 18.78 pounds
8518.4 g / 83.6 N
 OK
60 °C -4.4% 8.33 kg / 18.36 pounds
8326.8 g / 81.7 N
80 °C -6.6% 8.14 kg / 17.93 pounds
8135.1 g / 79.8 N
100 °C -28.8% 6.20 kg / 13.67 pounds
6201.5 g / 60.8 N
Standard neodymium magnets change their properties strength past the thermal threshold. Protect against heat – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's force temporarily lowers. Refrain from using this magnet close to ovens exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 30x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 16.74 kg / 36.91 pounds
3 437 Gs
2.51 kg / 5.54 pounds
2511 g / 24.6 N
 N/A
1 mm 16.20 kg / 35.71 pounds
3 856 Gs
2.43 kg / 5.36 pounds
2429 g / 23.8 N
 14.58 kg / 32.14 pounds
~0 Gs
2 mm 15.57 kg / 34.33 pounds
3 780 Gs
2.34 kg / 5.15 pounds
2335 g / 22.9 N
 14.01 kg / 30.89 pounds
~0 Gs
3 mm 14.89 kg / 32.82 pounds
3 696 Gs
2.23 kg / 4.92 pounds
2233 g / 21.9 N
 13.40 kg / 29.54 pounds
~0 Gs
5 mm 13.40 kg / 29.54 pounds
3 507 Gs
2.01 kg / 4.43 pounds
2010 g / 19.7 N
 12.06 kg / 26.58 pounds
~0 Gs
10 mm 9.53 kg / 21.00 pounds
2 957 Gs
1.43 kg / 3.15 pounds
1429 g / 14.0 N
 8.57 kg / 18.90 pounds
~0 Gs
20 mm 3.89 kg / 8.58 pounds
1 890 Gs
0.58 kg / 1.29 pounds
584 g / 5.7 N
 3.50 kg / 7.72 pounds
~0 Gs
50 mm 0.23 kg / 0.50 pounds
458 Gs
0.03 kg / 0.08 pounds
34 g / 0.3 N
 0.21 kg / 0.45 pounds
~0 Gs
60 mm 0.10 kg / 0.23 pounds
307 Gs
0.02 kg / 0.03 pounds
15 g / 0.2 N
 0.09 kg / 0.20 pounds
~0 Gs
70 mm 0.05 kg / 0.11 pounds
213 Gs
0.01 kg / 0.02 pounds
7 g / 0.1 N
 0.04 kg / 0.10 pounds
~0 Gs
80 mm 0.03 kg / 0.06 pounds
153 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
113 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
86 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a further horizon of action. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the impact force is huge. The repulsion force is slightly lower than the connection force, but still significant.
*Field value between like poles drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Attention: Estimates apply to shear force of a pair of same 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
Timepiece 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 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
Extremely neodym field poses a real danger to IT equipment as well as pacemakers. These NdFeB products generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Increased vigilance must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - 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 very brittle – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 16 658 Mx 166.6 µWb
Pc Coefficient 0.25 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Vertical hold

*Caution: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely limits the holding force.

3. Heat tolerance

*For standard magnets, the safety limit 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 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%
Sustainability
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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The presented product is an incredibly powerful rod magnet, composed of modern NdFeB material, which, with dimensions of Ø30x5 mm, guarantees maximum efficiency. The MW 30x5 / N38 model is characterized by an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 8.71 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 85.42 N with a weight of only 26.51 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 30.1 mm) using two-component epoxy glues. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. 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 available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø30x5 mm, which, at a weight of 26.51 g, makes it an element with impressive magnetic energy density. 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 power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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 30 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their notable power, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They retain their magnetic properties even under close interference source,
  • The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to versatility in forming and the capacity to adapt to unusual requirements,
  • Huge importance in modern industrial fields – they serve a role in mass storage devices, motor assemblies, diagnostic systems, and complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

Cons of neodymium magnets: tips and applications.
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their strength 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
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in realizing nuts and complex shapes in magnets, we propose using cover - magnetic mount.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets can disrupt the diagnostic process medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

The force parameter is a theoretical maximum value performed under the following configuration:
  • with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Effective lifting capacity is affected by specific conditions, mainly (from priority):
  • Clearance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
  • Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the load capacity.

Warnings
Protect data

Device Safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Medical interference

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Conscious usage

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their power.

Serious injuries

Danger of trauma: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.

Magnetic interference

A powerful magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.

Magnets are brittle

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets leads to them cracking into shards.

Dust is flammable

Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Keep away from children

Always keep magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.

Operating temperature

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.

Nickel coating and allergies

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact and select versions in plastic housing.

Caution! Looking for details? Read our article: Why are neodymium magnets dangerous?