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MW 8x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010105

GTIN/EAN: 5906301811046

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

1.88 g

Magnetization Direction

↑ axial

Load capacity

2.17 kg / 21.31 N

Magnetic Induction

483.41 mT / 4834 Gs

Coating

[NiCuNi] Nickel

0.836 with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 8x5 / N38 - cylindrical magnet

Specification / characteristics - MW 8x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010105
GTIN/EAN 5906301811046
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 8 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 1.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.17 kg / 21.31 N
Magnetic Induction ~ ? 483.41 mT / 4834 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x5 / N38 - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering analysis of the product - report

These values are the result of a physical calculation. Values are based on models for the material Nd2Fe14B. Operational parameters may differ. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - interaction chart
MW 8x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4830 Gs
483.0 mT
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
medium risk
1 mm 3655 Gs
365.5 mT
1.24 kg / 2.74 lbs
1242.8 g / 12.2 N
low risk
2 mm 2610 Gs
261.0 mT
0.63 kg / 1.40 lbs
633.9 g / 6.2 N
low risk
3 mm 1825 Gs
182.5 mT
0.31 kg / 0.68 lbs
310.0 g / 3.0 N
low risk
5 mm 915 Gs
91.5 mT
0.08 kg / 0.17 lbs
77.9 g / 0.8 N
low risk
10 mm 234 Gs
23.4 mT
0.01 kg / 0.01 lbs
5.1 g / 0.1 N
low risk
15 mm 89 Gs
8.9 mT
0.00 kg / 0.00 lbs
0.7 g / 0.0 N
low risk
20 mm 43 Gs
4.3 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
low risk
30 mm 14 Gs
1.4 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
50 mm 3 Gs
0.3 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk

Table 2: Vertical capacity (vertical surface)
MW 8x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.43 kg / 0.96 lbs
434.0 g / 4.3 N
1 mm Stal (~0.2) 0.25 kg / 0.55 lbs
248.0 g / 2.4 N
2 mm Stal (~0.2) 0.13 kg / 0.28 lbs
126.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.14 lbs
62.0 g / 0.6 N
5 mm Stal (~0.2) 0.02 kg / 0.04 lbs
16.0 g / 0.2 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MW 8x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.65 kg / 1.44 lbs
651.0 g / 6.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.43 kg / 0.96 lbs
434.0 g / 4.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.22 kg / 0.48 lbs
217.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.09 kg / 2.39 lbs
1085.0 g / 10.6 N

Table 4: Steel thickness (saturation) - power losses
MW 8x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.22 kg / 0.48 lbs
217.0 g / 2.1 N
1 mm
25%
0.54 kg / 1.20 lbs
542.5 g / 5.3 N
2 mm
50%
1.09 kg / 2.39 lbs
1085.0 g / 10.6 N
3 mm
75%
1.63 kg / 3.59 lbs
1627.5 g / 16.0 N
5 mm
100%
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
10 mm
100%
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
11 mm
100%
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
12 mm
100%
2.17 kg / 4.78 lbs
2170.0 g / 21.3 N

Table 5: Working in heat (material behavior) - resistance threshold
MW 8x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.17 kg / 4.78 lbs
2170.0 g / 21.3 N
OK
40 °C -2.2% 2.12 kg / 4.68 lbs
2122.3 g / 20.8 N
OK
60 °C -4.4% 2.07 kg / 4.57 lbs
2074.5 g / 20.4 N
OK
80 °C -6.6% 2.03 kg / 4.47 lbs
2026.8 g / 19.9 N
100 °C -28.8% 1.55 kg / 3.41 lbs
1545.0 g / 15.2 N

Table 6: Two magnets (attraction) - field range
MW 8x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.23 kg / 15.94 lbs
5 742 Gs
1.08 kg / 2.39 lbs
1084 g / 10.6 N
N/A
1 mm 5.58 kg / 12.31 lbs
8 490 Gs
0.84 kg / 1.85 lbs
838 g / 8.2 N
5.03 kg / 11.08 lbs
~0 Gs
2 mm 4.14 kg / 9.13 lbs
7 310 Gs
0.62 kg / 1.37 lbs
621 g / 6.1 N
3.73 kg / 8.21 lbs
~0 Gs
3 mm 2.98 kg / 6.58 lbs
6 207 Gs
0.45 kg / 0.99 lbs
448 g / 4.4 N
2.69 kg / 5.92 lbs
~0 Gs
5 mm 1.48 kg / 3.26 lbs
4 369 Gs
0.22 kg / 0.49 lbs
222 g / 2.2 N
1.33 kg / 2.93 lbs
~0 Gs
10 mm 0.26 kg / 0.57 lbs
1 830 Gs
0.04 kg / 0.09 lbs
39 g / 0.4 N
0.23 kg / 0.51 lbs
~0 Gs
20 mm 0.02 kg / 0.04 lbs
468 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.03 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
47 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
29 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
19 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
13 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
9 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
7 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (electronics) - warnings
MW 8x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.31 km/h
(9.53 m/s)
0.09 J
30 mm 59.35 km/h
(16.49 m/s)
0.26 J
50 mm 76.62 km/h
(21.28 m/s)
0.43 J
100 mm 108.35 km/h
(30.10 m/s)
0.85 J

Table 9: Corrosion resistance
MW 8x5 / 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)

Table 10: Construction data (Pc)
MW 8x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 450 Mx 24.5 µWb
Pc Coefficient 0.68 High (Stable)

Table 11: Submerged application
MW 8x5 / N38

Environment Effective steel pull Effect
Air (land) 2.17 kg Standard
Water (riverbed) 2.48 kg
(+0.31 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.
1. Vertical hold

*Note: On a vertical surface, the magnet retains merely a fraction of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.68

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.

Technical specification and ecology
Elemental analysis
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: 010105-2026
Quick Unit Converter
Force (pull)

Magnetic Induction

Other deals

The presented product is an extremely powerful cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø8x5 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 2.17 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring 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 high power of 21.31 N with a weight of only 1.88 g, this rod 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 immediate cracking of this professional component. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets 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 (Ø8x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø8x5 mm, which, at a weight of 1.88 g, makes it an element with high magnetic energy density. The value of 21.31 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.88 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 5 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized through the diameter if your project requires it.

Advantages and disadvantages of rare earth magnets.

Pros

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • Their power is durable, and after approximately ten years it decreases only by ~1% (theoretically),
  • Magnets effectively defend themselves against demagnetization caused by external fields,
  • A magnet with a metallic nickel surface looks better,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • 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 freedom in forming and the capacity to adapt to specific needs,
  • Significant place in high-tech industry – they are used in mass storage devices, electric drive systems, medical devices, also technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, taking into account:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section minimum 10 mm
  • with an polished touching surface
  • under conditions of no distance (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

It is worth knowing that the working load will differ influenced by elements below, in order of importance:
  • Gap (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Physical harm

Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Maximum temperature

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Powerful field

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

Allergy Warning

Medical facts indicate that nickel (the usual finish) is a common allergen. If you have an allergy, refrain from direct skin contact and select coated magnets.

Danger to the youngest

Adult use only. Small elements can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.

Safe distance

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Flammability

Machining of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Eye protection

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them cracking into small pieces.

Impact on smartphones

Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a separation from your phone, device, and GPS.

Warning for heart patients

People with a pacemaker must maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.

Warning! Need more info? Read our article: Why are neodymium magnets dangerous?