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MW 7x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010099

GTIN/EAN: 5906301810988

5.00
Load capacity 0.99 kg / 9.76 N Magnetic Induction 307.23 mT / 3072 Gs
Diameter Ø
7 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.58 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical specifications »

0.381 zł with VAT / pcs + price for transport

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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.

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Technical parameters - MW 7x2 / N38 - cylindrical magnet

Specification / characteristics - MW 7x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010099
GTIN/EAN 5906301810988
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 7 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 0.58 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.99 kg / 9.76 N
Magnetic Induction ~ ? 307.23 mT / 3072 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 7x2 / 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 modeling of the assembly - data

Presented values constitute the result of a mathematical calculation. Values are based on models for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Please consider these data as a reference point during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MW 7x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3070 Gs
307.0 mT
 0.99 kg / 2.18 pounds
990.0 g / 9.7 N
 weak grip
1 mm 2332 Gs
233.2 mT
 0.57 kg / 1.26 pounds
571.1 g / 5.6 N
 weak grip
2 mm 1590 Gs
159.0 mT
 0.27 kg / 0.59 pounds
265.5 g / 2.6 N
 weak grip
3 mm 1044 Gs
104.4 mT
 0.11 kg / 0.25 pounds
114.6 g / 1.1 N
 weak grip
5 mm 466 Gs
46.6 mT
 0.02 kg / 0.05 pounds
22.8 g / 0.2 N
 weak grip
10 mm 100 Gs
10.0 mT
 0.00 kg / 0.00 pounds
1.1 g / 0.0 N
 weak grip
15 mm 35 Gs
3.5 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
20 mm 16 Gs
1.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Grip strength decreases significantly with every mm of spacing. Remember that even a microscopic distance (e.g., contamination, paint, rust) noticeably diminishes the holding power. Neodymiums work most effectively at the point of direct contact; gap nullifies the power. See how flashily the parameters plummet, when the magnet does not adhere directly to the metal substrate. When calculating the mounting, avoid unnecessary gaps.

Table 2: Sliding load (vertical surface)
MW 7x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.20 kg / 0.44 pounds
198.0 g / 1.9 N
1 mm Stal (~0.2) 0.11 kg / 0.25 pounds
114.0 g / 1.1 N
2 mm Stal (~0.2) 0.05 kg / 0.12 pounds
54.0 g / 0.5 N
3 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
5 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 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
This section calculates the estimated shear load needed to start the sliding of the magnet downwards on a upright steel wall (considering typical friction). The holding force varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MW 7x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.30 kg / 0.65 pounds
297.0 g / 2.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.20 kg / 0.44 pounds
198.0 g / 1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 0.22 pounds
99.0 g / 1.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.50 kg / 1.09 pounds
495.0 g / 4.9 N
When mounting a element on a upright plane (e.g., a fridge), it you can count on barely approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip cause that magnets slip faster than they pop off the substrate. Designing a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the element will slip down under a noticeably lighter load. Using a rubber layer can effectively raise the stability.

Table 4: Material efficiency (saturation) - power losses
MW 7x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.10 kg / 0.22 pounds
99.0 g / 1.0 N
1 mm
25%
 0.25 kg / 0.55 pounds
247.5 g / 2.4 N
2 mm
50%
 0.50 kg / 1.09 pounds
495.0 g / 4.9 N
3 mm
75%
 0.74 kg / 1.64 pounds
742.5 g / 7.3 N
5 mm
100%
 0.99 kg / 2.18 pounds
990.0 g / 9.7 N
10 mm
100%
 0.99 kg / 2.18 pounds
990.0 g / 9.7 N
11 mm
100%
 0.99 kg / 2.18 pounds
990.0 g / 9.7 N
12 mm
100%
 0.99 kg / 2.18 pounds
990.0 g / 9.7 N
A thin metal plate is incapable of take in the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation phenomenon means that on thin elements (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel cross-section from these parameters.

Table 5: Working in heat (stability) - power drop
MW 7x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.99 kg / 2.18 pounds
990.0 g / 9.7 N
 OK
40 °C -2.2% 0.97 kg / 2.13 pounds
968.2 g / 9.5 N
 OK
60 °C -4.4% 0.95 kg / 2.09 pounds
946.4 g / 9.3 N
80 °C -6.6% 0.92 kg / 2.04 pounds
924.7 g / 9.1 N
100 °C -28.8% 0.70 kg / 1.55 pounds
704.9 g / 6.9 N
Standard neodymium magnets irreversibly lose power above the temperature limit. Protect against heat – high temperature can permanently damage this product. As the temperature rises, the neodymium's power momentarily decreases. Do not use this product in hot environments exceeding its operating temperature limit. Too high temperature will result in destruction of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 7x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.24 kg / 4.93 pounds
4 653 Gs
0.34 kg / 0.74 pounds
335 g / 3.3 N
 N/A
1 mm 1.76 kg / 3.89 pounds
5 454 Gs
0.26 kg / 0.58 pounds
265 g / 2.6 N
 1.59 kg / 3.50 pounds
~0 Gs
2 mm 1.29 kg / 2.84 pounds
4 663 Gs
0.19 kg / 0.43 pounds
193 g / 1.9 N
 1.16 kg / 2.56 pounds
~0 Gs
3 mm 0.89 kg / 1.97 pounds
3 884 Gs
0.13 kg / 0.30 pounds
134 g / 1.3 N
 0.81 kg / 1.77 pounds
~0 Gs
5 mm 0.40 kg / 0.87 pounds
2 581 Gs
0.06 kg / 0.13 pounds
59 g / 0.6 N
 0.36 kg / 0.78 pounds
~0 Gs
10 mm 0.05 kg / 0.11 pounds
932 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.10 pounds
~0 Gs
20 mm 0.00 kg / 0.01 pounds
200 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
17 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
10 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
6 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
4 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
3 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
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of action. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the impact force is huge. The levitation is marginally weaker than the connection force, but still impressive.
*The magnetic induction for N-N configuration drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Note: Calculations show sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - precautionary measures
MW 7x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.5 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
A strong magnetic field poses a real danger to IT equipment as well as pacemakers. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation acts through matter and housings. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MW 7x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.73 km/h
(7.15 m/s)
 0.01 J
30 mm 25.75 km/h
(7.15 m/s)
 0.01 J
50 mm 25.75 km/h
(7.15 m/s)
 0.01 J
100 mm 25.75 km/h
(7.15 m/s)
 0.01 J
NdFeB products are delicate – a collision with steel causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Coating parameters (durability)
MW 7x2 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MW 7x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 284 Mx 12.8 µWb
Pc Coefficient 0.39 Low (Flat)
Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient determines the working geometry.

Table 11: Submerged application
MW 7x2 / N38

Environment Effective steel pull Effect
Air (land) 0.99 kg Standard
Water (riverbed) 1.13 kg
(+0.14 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!
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely reduces 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) = 0.39

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

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%

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: 010099-2026
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The presented product is a very strong rod magnet, made from durable NdFeB material, which, with dimensions of Ø7x2 mm, guarantees maximum efficiency. The MW 7x2 / N38 component boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 0.99 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 9.76 N with a weight of only 0.58 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 immediate cracking of this professional component. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø7x2), 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 7 mm and height 2 mm. The value of 9.76 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.58 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 2 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.

Advantages and disadvantages of neodymium magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • Neodymium magnets are distinguished by extremely resistant to magnetic field loss caused by external interference,
  • A magnet with a smooth silver surface looks better,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Possibility of individual forming as well as adapting to precise applications,
  • Universal use in modern technologies – they serve a role in data components, electric drive systems, advanced medical instruments, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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
  • 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 suggest cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding force – what contributes to it?

The declared magnet strength represents the maximum value, obtained under optimal environment, specifically:
  • on a base made of mild steel, optimally conducting the magnetic field
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a plane free of scratches
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

It is worth knowing that the working load may be lower depending on the following factors, in order of importance:
  • Clearance – existence of any layer (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick plate does not close the flux, causing part of the flux to be wasted into the air.
  • Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
No play value

Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Cards and drives

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Operating temperature

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.

Fragile material

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Handling guide

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Hand protection

Pinching hazard: The pulling power is so immense that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Avoid contact if allergic

Certain individuals experience a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling may cause a rash. We recommend wear protective gloves.

Combustion hazard

Powder produced during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Implant safety

Warning for patients: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Precision electronics

An intense magnetic field negatively affects the functioning of compasses in phones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.

Caution! Need more info? Read our article: Why are neodymium magnets dangerous?