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MW 5x7 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010090

GTIN/EAN: 5906301810896

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

7 mm [±0,1 mm]

Weight

1.03 g

Magnetization Direction

↑ axial

Load capacity

0.67 kg / 6.60 N

Magnetic Induction

582.40 mT / 5824 Gs

Coating

[NiCuNi] Nickel

check specifications »

0.726 ZŁ with VAT / pcs + price for transport

0.590 ZŁ net + 23% VAT / pcs

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Technical specification - MW 5x7 / N38 - cylindrical magnet

Specification / characteristics - MW 5x7 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010090
GTIN/EAN 5906301810896
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 5 mm [±0,1 mm]
Height 7 mm [±0,1 mm]
Weight 1.03 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.67 kg / 6.60 N
Magnetic Induction ~ ? 582.40 mT / 5824 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x7 / 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 analysis of the magnet - technical parameters

The following values are the outcome of a mathematical calculation. Results are based on models for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 5x7 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5815 Gs
581.5 mT
 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
 low risk
1 mm 3615 Gs
361.5 mT
 0.26 kg / 0.57 pounds
259.0 g / 2.5 N
 low risk
2 mm 2101 Gs
210.1 mT
 0.09 kg / 0.19 pounds
87.4 g / 0.9 N
 low risk
3 mm 1252 Gs
125.2 mT
 0.03 kg / 0.07 pounds
31.1 g / 0.3 N
 low risk
5 mm 524 Gs
52.4 mT
 0.01 kg / 0.01 pounds
5.4 g / 0.1 N
 low risk
10 mm 119 Gs
11.9 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 low risk
15 mm 45 Gs
4.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
20 mm 21 Gs
2.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
30 mm 7 Gs
0.7 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
Grip strength weakens significantly with every mm of spacing. Keep in mind that even a very thin break (e.g., dirt, paint, dust) significantly weakens the grip. Neodymiums work optimally during direct contact; air break kills the force. Analyze how rapidly the pull force fall, when the magnet does not adhere flatly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Sliding hold (vertical surface)
MW 5x7 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.13 kg / 0.30 pounds
134.0 g / 1.3 N
1 mm Stal (~0.2) 0.05 kg / 0.11 pounds
52.0 g / 0.5 N
2 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 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
The table below presents the estimated holding capacity sufficient to cause the sliding of the magnet down against a vertical steel wall (assuming typical friction coefficient). This value is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 5x7 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.20 kg / 0.44 pounds
201.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.13 kg / 0.30 pounds
134.0 g / 1.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 pounds
67.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.34 kg / 0.74 pounds
335.0 g / 3.3 N
When mounting a element on a upright surface (e.g., a car body), it will only hold only approx. 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that magnets slide down faster than they detach. Planning a vertical fastening? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a significantly smaller weight. Using a rubber coating can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 5x7 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.07 kg / 0.15 pounds
67.0 g / 0.7 N
1 mm
25%
 0.17 kg / 0.37 pounds
167.5 g / 1.6 N
2 mm
50%
 0.34 kg / 0.74 pounds
335.0 g / 3.3 N
3 mm
75%
 0.50 kg / 1.11 pounds
502.5 g / 4.9 N
5 mm
100%
 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
10 mm
100%
 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
11 mm
100%
 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
12 mm
100%
 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
A thin metal plate is unable to focus the full magnetic flux, which wastes potential of the magnet. If you install a neodymium to a thin surface, the flux will penetrate right through and the holding will be smaller. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - power drop
MW 5x7 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
 OK
40 °C -2.2% 0.66 kg / 1.44 pounds
655.3 g / 6.4 N
 OK
60 °C -4.4% 0.64 kg / 1.41 pounds
640.5 g / 6.3 N
 OK
80 °C -6.6% 0.63 kg / 1.38 pounds
625.8 g / 6.1 N
100 °C -28.8% 0.48 kg / 1.05 pounds
477.0 g / 4.7 N
Classic neodymiums lose power above the temperature limit. Protect against heat – high temperature can irreversibly destroy this magnet. As the temperature rises, the magnet's capacity temporarily decreases. Avoid using this product close to heaters higher than its working range. Too high temperature will result in permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 5x7 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.09 kg / 9.02 pounds
6 079 Gs
0.61 kg / 1.35 pounds
614 g / 6.0 N
 N/A
1 mm 2.64 kg / 5.81 pounds
9 332 Gs
0.40 kg / 0.87 pounds
395 g / 3.9 N
 2.37 kg / 5.23 pounds
~0 Gs
2 mm 1.58 kg / 3.49 pounds
7 230 Gs
0.24 kg / 0.52 pounds
237 g / 2.3 N
 1.42 kg / 3.14 pounds
~0 Gs
3 mm 0.92 kg / 2.03 pounds
5 516 Gs
0.14 kg / 0.30 pounds
138 g / 1.4 N
 0.83 kg / 1.83 pounds
~0 Gs
5 mm 0.31 kg / 0.69 pounds
3 224 Gs
0.05 kg / 0.10 pounds
47 g / 0.5 N
 0.28 kg / 0.62 pounds
~0 Gs
10 mm 0.03 kg / 0.07 pounds
1 048 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.07 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
238 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
24 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
15 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
10 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
7 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
5 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 interact from a significantly greater distance than a magnet and steel combination. Such a system of magnet-to-magnet produces a massive flux and a further horizon of action. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the pinch force is massive. The levitation is a bit weaker than the connection force, but still large.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Estimates demonstrate shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MW 5x7 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 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
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
Powerful magnet radiation is a real danger to electronics and pacemakers. These magnets produce a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MW 5x7 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.73 km/h
(7.15 m/s)
 0.03 J
30 mm 44.55 km/h
(12.38 m/s)
 0.08 J
50 mm 57.52 km/h
(15.98 m/s)
 0.13 J
100 mm 81.34 km/h
(22.59 m/s)
 0.26 J
NdFeB products are delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MW 5x7 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 5x7 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 219 Mx 12.2 µWb
Pc Coefficient 1.05 High (Stable)
Flux value emitted by the pole surface. Key data when building generators and motors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MW 5x7 / N38

Environment Effective steel pull Effect
Air (land) 0.67 kg Standard
Water (riverbed) 0.77 kg
(+0.10 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.05

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.

Technical specification and ecology
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: 010090-2026
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The offered product is a very strong cylindrical magnet, manufactured from modern NdFeB material, which, with dimensions of Ø5x7 mm, guarantees optimal power. The MW 5x7 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.67 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 shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 6.60 N with a weight of only 1.03 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø5x7), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 5 mm and height 7 mm. The value of 6.60 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.03 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 7 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Pros and cons of neodymium magnets.

Benefits

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 possess excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
  • Thanks to the glossy finish, the surface of nickel, gold-plated, or silver gives an elegant appearance,
  • Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of individual forming as well as optimizing to defined applications,
  • Key role in modern industrial fields – they serve a role in data components, drive modules, medical equipment, and multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small components of these products can be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

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

Holding force of 0.67 kg is a result of laboratory testing conducted under standard conditions:
  • on a base made of mild steel, effectively closing the magnetic field
  • with a thickness no less than 10 mm
  • with an ground touching surface
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • at standard ambient temperature

Magnet lifting force in use – key factors

Effective lifting capacity impacted by working environment parameters, mainly (from most important):
  • Distance – the presence of any layer (rust, tape, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Fire warning

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Magnets are brittle

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them shattering into small pieces.

Power loss in heat

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Serious injuries

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

Metal Allergy

Some people experience a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Extended handling may cause an allergic reaction. We strongly advise use safety gloves.

GPS and phone interference

A strong magnetic field interferes with the operation of compasses in smartphones and navigation systems. Do not bring magnets near a device to prevent damaging the sensors.

Adults only

Always store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are tragic.

Pacemakers

Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Caution required

Use magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their power.

Threat to electronics

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?