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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

product specifications »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Force as well as appearance of a neodymium magnet can be estimated using our modular calculator.

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Detailed specification - 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

Physical analysis of the assembly - report

Presented data are the result of a mathematical analysis. Results are based on algorithms for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull 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 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
Pulling power decreases significantly per each millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, paint, rust) significantly reduces the pull force. Neodymiums hold strongest during direct contact; distance nullifies the power. Notice how rapidly the parameters drop, when the magnet does not touch flatly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Shear capacity (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
This section shows the theoretical holding capacity needed to cause the sliding of the magnet down along a upright metal surface (assuming typical friction coefficient). The holding force depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (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 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
When mounting a holder on a vertical wall (e.g., a car body), it will maintain just about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient influence the fact that holders slide down easier than they pop off the substrate. Want to create a wall mount? Consider that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will give way down under a noticeably lighter load. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Material efficiency (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
A thin sheet cannot take in the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a too thin substrate, the field will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's potential, you need a suitably thick element of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (stability) - 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 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
Classic neodymiums change their properties power after exceeding the maximum temperature. Avoid high temperatures – heat can irreversibly destroy this product. With increasing heat, the neodymium's force temporarily lowers. Do not use this magnet in hot environments exceeding its working range. Ignoring the limit will result in destruction of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
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
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of operation. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is massive. The repulsion force is a bit weaker than the attraction, but still large.
*Flux density for N-N configuration reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Important: Calculations show friction force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

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
Mechanical watch 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
A strong magnetic field is a real danger to electronics as well as pacemakers. These magnets produce a flux that destroys function of digital equipment. Be aware: the invisible magnetic field passes through tissues and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (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
Neodymium magnets are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Flux value emitted by the pole surface. Key data when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

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

2. Steel saturation

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

3. Temperature resistance

*For standard magnets, 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

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%
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
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The offered product is an extremely powerful cylindrical magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø8x3 mm, guarantees maximum efficiency. The MW 8x3 / N38 model boasts high dimensional repeatability and professional 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 warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a positioning 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 every gram matters.
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 stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. 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 warehouse.
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 oxidation, 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 diametrically if your project requires it.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to magnetism drop as a result of external magnetic sources,
  • In other words, due to the aesthetic surface of nickel, the element is aesthetically pleasing,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Considering the possibility of flexible shaping and customization to unique needs, magnetic components can be created in a wide range of geometric configurations, which amplifies use scope,
  • Wide application in electronics industry – they are utilized in mass storage devices, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power 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
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making nuts in the magnet and complicated forms - preferred is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameters – what contributes to it?

Holding force of 1.70 kg is a theoretical maximum value conducted under the following configuration:
  • on a block made of structural steel, effectively closing the magnetic flux
  • whose thickness reaches at least 10 mm
  • characterized by lack of roughness
  • under conditions of gap-free contact (metal-to-metal)
  • during pulling in a direction vertical to the mounting surface
  • at room temperature

Lifting capacity in practice – influencing factors

In real-world applications, the real power is determined by several key aspects, ranked from the most important:
  • Distance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling 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 decreases the load capacity.

H&S for magnets
Danger to pacemakers

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Fragile material

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Respect the power

Handle with care. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can react.

Product not for children

Absolutely keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.

Power loss in heat

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Machining danger

Powder generated during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Hand protection

Large magnets can crush fingers instantly. Do not put your hand betwixt two attracting surfaces.

Keep away from computers

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Allergy Warning

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, immediately stop handling magnets and use protective gear.

Magnetic interference

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Warning! Learn more about risks in the article: Safety of working with magnets.