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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

Technical simulation of the magnet - report

These information are the result of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Actual performance may differ. Use these data as a reference point for designers.

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

Table 2: Slippage load (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 (shearing) - 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 (substrate influence) - 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 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) - resistance threshold
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) 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: Hazards (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
Phone / Smartphone 40 Gs (4.0 mT) 2.0 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: Dynamics (kinetic energy) - warning
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 (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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Thermal stability

*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

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 and environmental data
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: 010103-2026
Quick Unit Converter
Magnet pull force

Magnetic Induction

Other offers

The presented product is an extremely powerful cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø8x3 mm, guarantees optimal power. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 1.70 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, 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 every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger 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.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 3 mm. 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 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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • They possess excellent resistance to weakening of magnetic properties as a result of opposing magnetic fields,
  • By using a lustrous layer of gold, the element presents an professional look,
  • Magnets have impressive magnetic induction on the outer side,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of exact creating as well as optimizing to atypical requirements,
  • Key role in modern technologies – they are commonly used in data components, drive modules, diagnostic systems, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength 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
  • 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 prevent oxidation and corrosion.
  • We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Highest magnetic holding forcewhat contributes to it?

The declared magnet strength refers to the peak performance, measured under optimal environment, meaning:
  • using a base made of low-carbon steel, acting as a magnetic yoke
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • in stable room temperature

Key elements affecting lifting force

Bear in mind that the application force will differ subject to elements below, starting with the most relevant:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Base massiveness – too thin steel does not close the flux, causing part of the flux to be lost to the other side.
  • Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Shattering risk

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets leads to them breaking into shards.

Do not give to children

Absolutely store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.

Powerful field

Handle magnets with awareness. Their huge power can shock even professionals. Plan your moves and respect their power.

Magnetic interference

Navigation devices and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Electronic hazard

Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Pinching danger

Danger of trauma: The pulling power is so great that it can cause hematomas, crushing, and broken bones. Use thick gloves.

Heat sensitivity

Avoid heat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Danger to pacemakers

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Allergic reactions

Certain individuals have a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Prolonged contact can result in a rash. We suggest use safety gloves.

Danger! Want to know more? Check our post: Are neodymium magnets dangerous?