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MW 8x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010103

GTIN/EAN: 5906301811022

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.13 g

Magnetization Direction

↑ axial

Load capacity

1.70 kg / 16.67 N

Magnetic Induction

371.53 mT / 3715 Gs

Coating

[NiCuNi] Nickel

0.701 with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical - MW 8x3 / N38 - cylindrical magnet

Specification / characteristics - MW 8x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010103
GTIN/EAN 5906301811022
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 3 mm [±0,1 mm]
Weight 1.13 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.70 kg / 16.67 N
Magnetic Induction ~ ? 371.53 mT / 3715 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x3 / 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 assembly - data

The following values constitute the outcome of a mathematical analysis. Values rely on models for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Use these data as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - power drop
MW 8x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3712 Gs
371.2 mT
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
low risk
1 mm 2880 Gs
288.0 mT
1.02 kg / 2.26 pounds
1023.3 g / 10.0 N
low risk
2 mm 2069 Gs
206.9 mT
0.53 kg / 1.16 pounds
527.9 g / 5.2 N
low risk
3 mm 1439 Gs
143.9 mT
0.26 kg / 0.56 pounds
255.3 g / 2.5 N
low risk
5 mm 704 Gs
70.4 mT
0.06 kg / 0.13 pounds
61.1 g / 0.6 N
low risk
10 mm 169 Gs
16.9 mT
0.00 kg / 0.01 pounds
3.5 g / 0.0 N
low risk
15 mm 62 Gs
6.2 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
low risk
20 mm 29 Gs
2.9 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
low risk
30 mm 9 Gs
0.9 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

Table 2: Slippage force (wall)
MW 8x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.34 kg / 0.75 pounds
340.0 g / 3.3 N
1 mm Stal (~0.2) 0.20 kg / 0.45 pounds
204.0 g / 2.0 N
2 mm Stal (~0.2) 0.11 kg / 0.23 pounds
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.05 kg / 0.11 pounds
52.0 g / 0.5 N
5 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 8x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.51 kg / 1.12 pounds
510.0 g / 5.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.85 kg / 1.87 pounds
850.0 g / 8.3 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
1 mm
25%
0.43 kg / 0.94 pounds
425.0 g / 4.2 N
2 mm
50%
0.85 kg / 1.87 pounds
850.0 g / 8.3 N
3 mm
75%
1.28 kg / 2.81 pounds
1275.0 g / 12.5 N
5 mm
100%
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
10 mm
100%
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
11 mm
100%
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
12 mm
100%
1.70 kg / 3.75 pounds
1700.0 g / 16.7 N

Table 5: Thermal stability (stability) - thermal limit
MW 8x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.70 kg / 3.75 pounds
1700.0 g / 16.7 N
OK
40 °C -2.2% 1.66 kg / 3.67 pounds
1662.6 g / 16.3 N
OK
60 °C -4.4% 1.63 kg / 3.58 pounds
1625.2 g / 15.9 N
80 °C -6.6% 1.59 kg / 3.50 pounds
1587.8 g / 15.6 N
100 °C -28.8% 1.21 kg / 2.67 pounds
1210.4 g / 11.9 N

Table 6: Two magnets (attraction) - field collision
MW 8x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.27 kg / 9.42 pounds
5 146 Gs
0.64 kg / 1.41 pounds
641 g / 6.3 N
N/A
1 mm 3.40 kg / 7.50 pounds
6 627 Gs
0.51 kg / 1.13 pounds
510 g / 5.0 N
3.06 kg / 6.75 pounds
~0 Gs
2 mm 2.57 kg / 5.67 pounds
5 761 Gs
0.39 kg / 0.85 pounds
386 g / 3.8 N
2.31 kg / 5.10 pounds
~0 Gs
3 mm 1.87 kg / 4.12 pounds
4 914 Gs
0.28 kg / 0.62 pounds
281 g / 2.8 N
1.68 kg / 3.71 pounds
~0 Gs
5 mm 0.93 kg / 2.04 pounds
3 456 Gs
0.14 kg / 0.31 pounds
139 g / 1.4 N
0.83 kg / 1.84 pounds
~0 Gs
10 mm 0.15 kg / 0.34 pounds
1 408 Gs
0.02 kg / 0.05 pounds
23 g / 0.2 N
0.14 kg / 0.30 pounds
~0 Gs
20 mm 0.01 kg / 0.02 pounds
339 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
31 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
19 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
12 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
6 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
4 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (electronics) - warnings
MW 8x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Car key 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 8x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 39.17 km/h
(10.88 m/s)
0.07 J
30 mm 67.75 km/h
(18.82 m/s)
0.20 J
50 mm 87.47 km/h
(24.30 m/s)
0.33 J
100 mm 123.70 km/h
(34.36 m/s)
0.67 J

Table 9: Coating parameters (durability)
MW 8x3 / 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 (Flux)
MW 8x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 946 Mx 19.5 µWb
Pc Coefficient 0.48 Low (Flat)

Table 11: Submerged application
MW 8x3 / N38

Environment Effective steel pull Effect
Air (land) 1.70 kg Standard
Water (riverbed) 1.95 kg
(+0.25 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. Shear force

*Warning: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly 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) = 0.48

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
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%
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: 010103-2026
Magnet Unit Converter
Force (pull)

Magnetic Field

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This product is an exceptionally strong rod magnet, composed of durable NdFeB material, which, at dimensions of Ø8x3 mm, guarantees the highest energy density. The MW 8x3 / N38 model boasts an accuracy 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. 1.70 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 16.67 N with a weight of only 1.13 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø8x3), 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 Ø8x3 mm, which, at a weight of 1.13 g, makes it an element with impressive magnetic energy density. The value of 16.67 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.13 g. 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 8 mm. 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.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • They do not lose their magnetic properties even under strong external field,
  • Thanks to the shiny finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the ability of free shaping and customization to unique needs, NdFeB magnets can be created in a wide range of geometric configurations, which increases their versatility,
  • Key role in electronics industry – they are used in mass storage devices, drive modules, medical devices, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets: tips and applications.
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing nuts and complex forms in magnets, we propose using casing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small components of these magnets are able to complicate diagnosis medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Maximum lifting capacity of the magnetwhat contributes to it?

The specified lifting capacity represents the limit force, recorded under ideal test conditions, specifically:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • with a thickness no less than 10 mm
  • with an polished contact surface
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at temperature room level

Practical aspects of lifting capacity – factors

Please note that the working load will differ influenced by elements below, in order of importance:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Implant safety

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Dust explosion hazard

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Cards and drives

Very strong magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

This is not a toy

Strictly store magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are very dangerous.

Eye protection

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Warning for allergy sufferers

Certain individuals suffer from a sensitization to Ni, which is the typical protective layer for neodymium magnets. Frequent touching can result in a rash. We suggest wear protective gloves.

Finger safety

Large magnets can smash fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Phone sensors

Be aware: rare earth magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, tablet, and navigation systems.

Powerful field

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Attention! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98