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MW 16x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010034

GTIN/EAN: 5906301810339

5.00
Load capacity 4.43 kg / 43.46 N Magnetic Induction 277.14 mT / 2771 Gs
Diameter Ø
16 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
6.03 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical parameters »

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
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Force along with shape of a neodymium magnet can be estimated on our online calculation tool.

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Technical parameters - MW 16x4 / N38 - cylindrical magnet

Specification / characteristics - MW 16x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010034
GTIN/EAN 5906301810339
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 16 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 6.03 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.43 kg / 43.46 N
Magnetic Induction ~ ? 277.14 mT / 2771 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 16x4 / 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 simulation of the assembly - report

These information are the direct effect of a physical simulation. Values were calculated on models for the class Nd2Fe14B. Real-world conditions may differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MW 16x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2771 Gs
277.1 mT
 4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
 strong
1 mm 2517 Gs
251.7 mT
 3.66 kg / 8.06 pounds
3656.3 g / 35.9 N
 strong
2 mm 2216 Gs
221.6 mT
 2.83 kg / 6.25 pounds
2834.9 g / 27.8 N
 strong
3 mm 1906 Gs
190.6 mT
 2.10 kg / 4.62 pounds
2096.1 g / 20.6 N
 strong
5 mm 1348 Gs
134.8 mT
 1.05 kg / 2.31 pounds
1048.6 g / 10.3 N
 weak grip
10 mm 542 Gs
54.2 mT
 0.17 kg / 0.37 pounds
169.4 g / 1.7 N
 weak grip
15 mm 244 Gs
24.4 mT
 0.03 kg / 0.08 pounds
34.2 g / 0.3 N
 weak grip
20 mm 125 Gs
12.5 mT
 0.01 kg / 0.02 pounds
9.1 g / 0.1 N
 weak grip
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.00 pounds
1.1 g / 0.0 N
 weak grip
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
Magnetic force drops drastically per each millimeter of spacing. Remember that even the smallest gap (e.g., contamination, varnish, rust) strongly diminishes the holding power. Magnetic products operate strongest at the point of direct contact; distance kills the force. Observe how rapidly the load capacity plummet, when the magnet does not adhere directly to the steel surface. When calculating the arrangement, avoid additional spacers.

Table 2: Sliding force (wall)
MW 16x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
1 mm Stal (~0.2) 0.73 kg / 1.61 pounds
732.0 g / 7.2 N
2 mm Stal (~0.2) 0.57 kg / 1.25 pounds
566.0 g / 5.6 N
3 mm Stal (~0.2) 0.42 kg / 0.93 pounds
420.0 g / 4.1 N
5 mm Stal (~0.2) 0.21 kg / 0.46 pounds
210.0 g / 2.1 N
10 mm Stal (~0.2) 0.03 kg / 0.07 pounds
34.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 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
The following data defines the theoretical holding capacity required to start the slippage of the magnet vertically along a vertical steel wall (assuming standard friction coefficient). This value varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 16x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.33 kg / 2.93 pounds
1329.0 g / 13.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.89 kg / 1.95 pounds
886.0 g / 8.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.44 kg / 0.98 pounds
443.0 g / 4.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.22 kg / 4.88 pounds
2215.0 g / 21.7 N
When mounting a holder on a vertical surface (e.g., a car body), it will maintain barely approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that holders slip easier than they pop off the substrate. Designing a hanger? Note that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a much lighter cargo. Application of an anti-slip layer can effectively raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 16x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.44 kg / 0.98 pounds
443.0 g / 4.3 N
1 mm
25%
 1.11 kg / 2.44 pounds
1107.5 g / 10.9 N
2 mm
50%
 2.22 kg / 4.88 pounds
2215.0 g / 21.7 N
3 mm
75%
 3.32 kg / 7.32 pounds
3322.5 g / 32.6 N
5 mm
100%
 4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
10 mm
100%
 4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
11 mm
100%
 4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
12 mm
100%
 4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
A thin metal plate is not enough to take in the entire magnetic field, which squanders power of the holder. Should you attach a powerful product to a thin surface, the field will pass right through and the pull force will drop sharply. To achieve the maximum of this magnet's power, you need a suitably thick element of steel. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We advise picking the steel dimension from these parameters.

Table 5: Thermal stability (stability) - power drop
MW 16x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
 OK
40 °C -2.2% 4.33 kg / 9.55 pounds
4332.5 g / 42.5 N
 OK
60 °C -4.4% 4.24 kg / 9.34 pounds
4235.1 g / 41.5 N
80 °C -6.6% 4.14 kg / 9.12 pounds
4137.6 g / 40.6 N
100 °C -28.8% 3.15 kg / 6.95 pounds
3154.2 g / 30.9 N
Classic neodymiums change their properties power after exceeding the maximum temperature. Avoid high temperatures – heat can permanently destroy this product. With every degree above norm, the magnet's capacity briefly decreases. Refrain from using this magnet close to heaters exceeding its safe range. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 16x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.51 kg / 20.98 pounds
4 379 Gs
1.43 kg / 3.15 pounds
1427 g / 14.0 N
 N/A
1 mm 8.72 kg / 19.23 pounds
5 306 Gs
1.31 kg / 2.88 pounds
1309 g / 12.8 N
 7.85 kg / 17.31 pounds
~0 Gs
2 mm 7.85 kg / 17.31 pounds
5 034 Gs
1.18 kg / 2.60 pounds
1178 g / 11.6 N
 7.07 kg / 15.58 pounds
~0 Gs
3 mm 6.96 kg / 15.35 pounds
4 740 Gs
1.04 kg / 2.30 pounds
1044 g / 10.2 N
 6.27 kg / 13.81 pounds
~0 Gs
5 mm 5.26 kg / 11.60 pounds
4 121 Gs
0.79 kg / 1.74 pounds
789 g / 7.7 N
 4.74 kg / 10.44 pounds
~0 Gs
10 mm 2.25 kg / 4.97 pounds
2 696 Gs
0.34 kg / 0.74 pounds
338 g / 3.3 N
 2.03 kg / 4.47 pounds
~0 Gs
20 mm 0.36 kg / 0.80 pounds
1 083 Gs
0.05 kg / 0.12 pounds
55 g / 0.5 N
 0.33 kg / 0.72 pounds
~0 Gs
50 mm 0.01 kg / 0.01 pounds
143 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
89 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
59 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
41 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
29 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
22 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a wider radius than a magnet and steel combination. Such a system of magnet-to-magnet generates a stronger field and a further horizon of operation. Want to build a strong closure? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still large.
*Flux density between like poles reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Important: Calculations demonstrate friction force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 16x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a serious hazard to electronic devices and pacemakers. These magnets produce a field that disrupts operation of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MW 16x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.32 km/h
(7.03 m/s)
 0.15 J
30 mm 25.76 km/h
(7.16 m/s)
 0.15 J
50 mm 25.77 km/h
(7.16 m/s)
 0.15 J
100 mm 25.77 km/h
(7.16 m/s)
 0.15 J
Neodymium magnets are prone to chipping – a strong collision with metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to fingers. Be sure to control the product during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Anti-corrosion coating durability
MW 16x4 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MW 16x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 192 Mx 61.9 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 16x4 / N38

Environment Effective steel pull Effect
Air (land) 4.43 kg Standard
Water (riverbed) 5.07 kg
(+0.64 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.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Shear force

*Caution: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*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) = 0.35

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 specification and ecology

Chemical composition

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%

Ecology and recycling (GPSR)

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: 010034-2026
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This product is an exceptionally strong cylindrical magnet, made from durable NdFeB material, which, with dimensions of Ø16x4 mm, guarantees optimal power. The MW 16x4 / N38 component features high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 4.43 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 43.46 N with a weight of only 6.03 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø16x4), 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 16 mm and height 4 mm. The key parameter here is the holding force amounting to approximately 4.43 kg (force ~43.46 N), which, with such defined dimensions, proves the high power of the NdFeB material. 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 4 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 rare earth magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • Their magnetic field remains stable, and after around ten years it decreases only by ~1% (according to research),
  • Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by external interference,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
  • Thanks to flexibility in designing and the capacity to adapt to complex applications,
  • Fundamental importance in advanced technology sectors – they are used in mass storage devices, brushless drives, medical devices, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in producing threads and complicated shapes in magnets, we recommend using a housing - magnetic mount.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what affects it?

Breakaway force was determined for the most favorable conditions, including:
  • with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section minimum 10 mm
  • with a surface free of scratches
  • with direct contact (no coatings)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Please note that the working load will differ subject to the following factors, starting with the most relevant:
  • Clearance – the presence of any layer (rust, dirt, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Steel type – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and holding force.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with neodymium magnets
Bodily injuries

Protect your hands. Two powerful magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Eye protection

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Mechanical processing

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Swallowing risk

Always keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are life-threatening.

Caution required

Handle magnets consciously. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.

Impact on smartphones

Remember: rare earth magnets produce a field that disrupts precision electronics. Keep a separation from your mobile, device, and navigation systems.

Implant safety

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Cards and drives

Do not bring magnets near a purse, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.

Operating temperature

Avoid heat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Avoid contact if allergic

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.

Danger! More info about risks in the article: Magnet Safety Guide.