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MW 4x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010077

GTIN/EAN: 5906301810766

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

0.47 g

Magnetization Direction

↑ axial

Load capacity

0.46 kg / 4.48 N

Magnetic Induction

573.83 mT / 5738 Gs

Coating

[NiCuNi] Nickel

see parameters »

0.320 ZŁ with VAT / pcs + price for transport

0.260 ZŁ net + 23% VAT / pcs

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Technical data - MW 4x5 / N38 - cylindrical magnet

Specification / characteristics - MW 4x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010077
GTIN/EAN 5906301810766
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 4 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 0.47 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.46 kg / 4.48 N
Magnetic Induction ~ ? 573.83 mT / 5738 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x5 / 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

The following values represent the direct effect of a mathematical simulation. Values were calculated on models for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
MW 4x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5727 Gs
572.7 mT
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
 low risk
1 mm 3109 Gs
310.9 mT
 0.14 kg / 0.30 pounds
135.6 g / 1.3 N
 low risk
2 mm 1577 Gs
157.7 mT
 0.03 kg / 0.08 pounds
34.9 g / 0.3 N
 low risk
3 mm 856 Gs
85.6 mT
 0.01 kg / 0.02 pounds
10.3 g / 0.1 N
 low risk
5 mm 323 Gs
32.3 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 low risk
10 mm 66 Gs
6.6 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 low risk
15 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
20 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
30 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Pulling power drops drastically per each millimeter of distance. Remember that every additional insulation layer (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Magnets work strongest at the point of direct contact; distance weakens the force. Notice how flashily the pull force plummet, when the product does not adhere directly to the metal substrate. When planning the assembly, discard additional spacers.

Table 2: Sliding force (vertical surface)
MW 4x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.09 kg / 0.20 pounds
92.0 g / 0.9 N
1 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
2 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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 indicates the theoretical weight limit necessary to start the slippage of the magnet downwards on a upright steel wall (considering typical friction). This parameter depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 4x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.14 kg / 0.30 pounds
138.0 g / 1.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.09 kg / 0.20 pounds
92.0 g / 0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.23 kg / 0.51 pounds
230.0 g / 2.3 N
When placing a magnet on a vertical wall (e.g., a fridge), it will only hold barely approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip mean that holders move down easier than they pop off the substrate. Designing a wall mount? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a much lighter weight. Application of an anti-slip pad can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 4x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.05 kg / 0.10 pounds
46.0 g / 0.5 N
1 mm
25%
 0.12 kg / 0.25 pounds
115.0 g / 1.1 N
2 mm
50%
 0.23 kg / 0.51 pounds
230.0 g / 2.3 N
3 mm
75%
 0.35 kg / 0.76 pounds
345.0 g / 3.4 N
5 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
10 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
11 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
12 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
A thin metal plate is unable to take in the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this magnet's potential, you need a suitably thick piece of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the product works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MW 4x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
 OK
40 °C -2.2% 0.45 kg / 0.99 pounds
449.9 g / 4.4 N
 OK
60 °C -4.4% 0.44 kg / 0.97 pounds
439.8 g / 4.3 N
 OK
80 °C -6.6% 0.43 kg / 0.95 pounds
429.6 g / 4.2 N
100 °C -28.8% 0.33 kg / 0.72 pounds
327.5 g / 3.2 N
Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly damage this product. With increasing heat, the magnet's force briefly decreases. Avoid using this magnet in hot environments exceeding its operating temperature limit. Too high temperature will result in destruction of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MW 4x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.54 kg / 5.60 pounds
6 049 Gs
0.38 kg / 0.84 pounds
381 g / 3.7 N
 N/A
1 mm 1.45 kg / 3.19 pounds
8 646 Gs
0.22 kg / 0.48 pounds
217 g / 2.1 N
 1.30 kg / 2.87 pounds
~0 Gs
2 mm 0.75 kg / 1.65 pounds
6 218 Gs
0.11 kg / 0.25 pounds
112 g / 1.1 N
 0.67 kg / 1.49 pounds
~0 Gs
3 mm 0.38 kg / 0.83 pounds
4 412 Gs
0.06 kg / 0.12 pounds
57 g / 0.6 N
 0.34 kg / 0.75 pounds
~0 Gs
5 mm 0.10 kg / 0.23 pounds
2 299 Gs
0.02 kg / 0.03 pounds
15 g / 0.2 N
 0.09 kg / 0.20 pounds
~0 Gs
10 mm 0.01 kg / 0.02 pounds
646 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
132 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
12 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
7 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
5 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
3 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
2 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 magnets attract each other from a significantly greater distance than a magnet and steel setup. The connection of two magnets generates a stronger field and a wider radius of action. Designing a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is huge. The repulsion force is marginally weaker than the attraction, but still large.
*Flux density for N-N configuration drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Results apply to shear force of dual identical magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MW 4x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 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) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field poses a large risk to electronic devices as well as medical implants. These NdFeB products produce a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MW 4x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 31.55 km/h
(8.76 m/s)
 0.02 J
30 mm 54.65 km/h
(15.18 m/s)
 0.05 J
50 mm 70.55 km/h
(19.60 m/s)
 0.09 J
100 mm 99.77 km/h
(27.71 m/s)
 0.18 J
Neodymium magnets are delicate – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MW 4x5 / 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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 4x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 760 Mx 7.6 µWb
Pc Coefficient 1.00 High (Stable)
Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MW 4x5 / N38

Environment Effective steel pull Effect
Air (land) 0.46 kg Standard
Water (riverbed) 0.53 kg
(+0.07 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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

*Warning: On a vertical surface, the magnet holds merely ~20% of its max power.

2. Plate thickness effect

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

3. Temperature resistance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.00

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 and environmental data
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: 010077-2026
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The presented product is an incredibly powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø4x5 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.46 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 4.48 N with a weight of only 0.47 g, this rod is indispensable in miniature devices 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 chipping the coating of this professional component. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø4x5), 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 4 mm and height 5 mm. The key parameter here is the holding force amounting to approximately 0.46 kg (force ~4.48 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 5 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even during around 10 years – the reduction in lifting capacity is only ~1% (theoretically),
  • They have excellent resistance to weakening of magnetic properties as a result of external fields,
  • Thanks to the glossy finish, the plating of nickel, gold, or silver-plated gives an professional appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • 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...
  • Thanks to flexibility in shaping and the capacity to adapt to specific needs,
  • Universal use in future technologies – they are used in HDD drives, electric drive systems, medical devices, and technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • NdFeB magnets lose force 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, when using outdoors
  • We recommend cover - magnetic holder, due to difficulties in creating threads inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what it depends on?

Breakaway force was defined for the most favorable conditions, including:
  • using a sheet made of mild steel, acting as a ideal flux conductor
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • without the slightest clearance between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

Real force is affected by specific conditions, such as (from most important):
  • Distance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted into the air.
  • Metal type – not every steel attracts identically. Alloy additives weaken the attraction effect.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
Bodily injuries

Protect your hands. Two large magnets will snap together instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

ICD Warning

Individuals with a pacemaker should maintain an large gap from magnets. The magnetism can stop the operation of the implant.

Magnets are brittle

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Nickel allergy

A percentage of the population have a contact allergy to Ni, which is the common plating for neodymium magnets. Prolonged contact might lead to dermatitis. It is best to wear safety gloves.

Safe operation

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Protect data

Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Compass and GPS

Navigation devices and smartphones are highly susceptible to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Do not overheat magnets

Watch the temperature. Exposing the magnet to high heat will ruin its properties and strength.

Flammability

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

No play value

Product intended for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.

Warning! Looking for details? Check our post: Why are neodymium magnets dangerous?