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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 of the product - 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 modeling of the product - technical parameters

The following data constitute the direct effect of a physical analysis. Values rely on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
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 LBS
1700.0 g / 16.7 N
safe
1 mm 2880 Gs
288.0 mT
1.02 kg / 2.26 LBS
1023.3 g / 10.0 N
safe
2 mm 2069 Gs
206.9 mT
0.53 kg / 1.16 LBS
527.9 g / 5.2 N
safe
3 mm 1439 Gs
143.9 mT
0.26 kg / 0.56 LBS
255.3 g / 2.5 N
safe
5 mm 704 Gs
70.4 mT
0.06 kg / 0.13 LBS
61.1 g / 0.6 N
safe
10 mm 169 Gs
16.9 mT
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
safe
15 mm 62 Gs
6.2 mT
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
safe
20 mm 29 Gs
2.9 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
safe
30 mm 9 Gs
0.9 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Slippage load (vertical surface)
MW 8x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.34 kg / 0.75 LBS
340.0 g / 3.3 N
1 mm Stal (~0.2) 0.20 kg / 0.45 LBS
204.0 g / 2.0 N
2 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.05 kg / 0.11 LBS
52.0 g / 0.5 N
5 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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) - 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 LBS
510.0 g / 5.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.85 kg / 1.87 LBS
850.0 g / 8.3 N

Table 4: Material efficiency (saturation) - power losses
MW 8x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
1 mm
25%
0.43 kg / 0.94 LBS
425.0 g / 4.2 N
2 mm
50%
0.85 kg / 1.87 LBS
850.0 g / 8.3 N
3 mm
75%
1.28 kg / 2.81 LBS
1275.0 g / 12.5 N
5 mm
100%
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
10 mm
100%
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
11 mm
100%
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
12 mm
100%
1.70 kg / 3.75 LBS
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 LBS
1700.0 g / 16.7 N
OK
40 °C -2.2% 1.66 kg / 3.67 LBS
1662.6 g / 16.3 N
OK
60 °C -4.4% 1.63 kg / 3.58 LBS
1625.2 g / 15.9 N
80 °C -6.6% 1.59 kg / 3.50 LBS
1587.8 g / 15.6 N
100 °C -28.8% 1.21 kg / 2.67 LBS
1210.4 g / 11.9 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 8x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.27 kg / 9.42 LBS
5 146 Gs
0.64 kg / 1.41 LBS
641 g / 6.3 N
N/A
1 mm 3.40 kg / 7.50 LBS
6 627 Gs
0.51 kg / 1.13 LBS
510 g / 5.0 N
3.06 kg / 6.75 LBS
~0 Gs
2 mm 2.57 kg / 5.67 LBS
5 761 Gs
0.39 kg / 0.85 LBS
386 g / 3.8 N
2.31 kg / 5.10 LBS
~0 Gs
3 mm 1.87 kg / 4.12 LBS
4 914 Gs
0.28 kg / 0.62 LBS
281 g / 2.8 N
1.68 kg / 3.71 LBS
~0 Gs
5 mm 0.93 kg / 2.04 LBS
3 456 Gs
0.14 kg / 0.31 LBS
139 g / 1.4 N
0.83 kg / 1.84 LBS
~0 Gs
10 mm 0.15 kg / 0.34 LBS
1 408 Gs
0.02 kg / 0.05 LBS
23 g / 0.2 N
0.14 kg / 0.30 LBS
~0 Gs
20 mm 0.01 kg / 0.02 LBS
339 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
31 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
19 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
12 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
8 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
6 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
4 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~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
Mechanical watch 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 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: Dynamics (cracking risk) - 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: Surface protection spec
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. Sliding resistance

*Caution: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Temperature resistance

*For N38 material, 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
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: 010103-2026
Measurement Calculator
Pulling force

Magnetic Induction

See also products

This product is a very strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø8x3 mm, guarantees optimal power. The MW 8x3 / N38 model boasts a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 1.70 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction 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 electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for the majority of applications in modeling and machine building, where extreme 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 1.70 kg (force ~16.67 N), which, with such defined 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 3 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 as well as disadvantages of rare earth magnets.

Strengths

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They do not lose strength, even during approximately 10 years – the decrease in power is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by external field influence,
  • In other words, due to the reflective finish of silver, the element looks attractive,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of custom forming and adapting to individual applications,
  • Fundamental importance in modern technologies – they serve a role in computer drives, brushless drives, medical equipment, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • 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, when using outdoors
  • Due to limitations in producing nuts and complex forms in magnets, we propose using a housing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat it depends on?

The declared magnet strength represents the maximum value, recorded under laboratory conditions, namely:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a thickness of at least 10 mm
  • characterized by even structure
  • under conditions of gap-free contact (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Practical aspects of lifting capacity – factors

In real-world applications, the actual lifting capacity results from several key aspects, listed from crucial:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Safe distance

Do not bring magnets near a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Dust is flammable

Powder generated during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Danger to pacemakers

Individuals with a heart stimulator should keep an absolute distance from magnets. The magnetism can interfere with the operation of the implant.

Danger to the youngest

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.

Metal Allergy

A percentage of the population experience a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling might lead to a rash. We strongly advise wear safety gloves.

Risk of cracking

Protect your eyes. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Heat sensitivity

Keep cool. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Threat to navigation

Remember: rare earth magnets generate a field that disrupts precision electronics. Maintain a safe distance from your mobile, tablet, and navigation systems.

Conscious usage

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

Finger safety

Mind your fingers. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Security! Learn more about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98