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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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Physical properties - 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 simulation of the product - data

These values constitute the result of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance may differ. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - 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 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 hold (wall)
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: Vertical assembly (sliding) - vertical pull
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: Steel thickness (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 (material behavior) - power drop
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: Two magnets (attraction) - field range
MW 8x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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: Safety (HSE) (implants) - 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: Collisions (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: 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 (Pc)
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%
Rust risk: 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 wall, the magnet holds merely ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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.

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
Quick Unit Converter
Magnet pull force

Magnetic Induction

Other proposals

The presented product is an incredibly powerful rod magnet, made from durable NdFeB material, which, with dimensions of Ø8x3 mm, guarantees the highest energy density. The MW 8x3 / N38 component is characterized by an accuracy of ±0.1mm and industrial build quality, making it an excellent 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 lightning-fast order fulfillment. Additionally, its 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 modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 16.67 N with a weight of only 1.13 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, anaerobic resins 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 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 available off-the-shelf in our store.
This model is characterized by dimensions Ø8x3 mm, which, at a weight of 1.13 g, makes it an element with high 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.
This cylinder is magnetized axially (along the height of 3 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 Nd2Fe14B magnets.

Advantages

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They have excellent resistance to magnetism drop when exposed to external magnetic sources,
  • Thanks to the glossy finish, the coating of nickel, gold, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of detailed forming and optimizing to concrete conditions,
  • Significant place in future technologies – they find application in HDD drives, electric motors, medical equipment, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Magnet power is the result of a measurement for optimal configuration, including:
  • on a base made of structural steel, effectively closing the magnetic field
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with a plane free of scratches
  • without the slightest insulating layer between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Effective lifting capacity is influenced by specific conditions, mainly (from most important):
  • Gap (betwixt the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safe handling of NdFeB magnets
Keep away from computers

Very strong magnetic fields can destroy records on payment cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Skin irritation risks

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands and choose versions in plastic housing.

Protective goggles

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Fire risk

Dust generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

This is not a toy

These products are not toys. Eating multiple magnets may result in them pinching intestinal walls, which poses a direct threat to life and requires urgent medical intervention.

Do not underestimate power

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Pinching danger

Large magnets can smash fingers instantly. Do not place your hand betwixt two attracting surfaces.

Implant safety

Patients with a ICD must maintain an safe separation from magnets. The magnetic field can stop the operation of the implant.

Operating temperature

Do not overheat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Threat to navigation

A powerful magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Caution! Details about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98