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MP 10x4.3x4 / N38 - ring magnet

ring magnet

Catalog no 030178

GTIN/EAN: 5906301811954

5.00

Diameter

10 mm [±0,1 mm]

internal diameter Ø

4.3 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

1.92 g

Magnetization Direction

↑ axial

Load capacity

2.28 kg / 22.35 N

Magnetic Induction

386.91 mT / 3869 Gs

Coating

[NiCuNi] Nickel

technical parameters »

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Technical details - MP 10x4.3x4 / N38 - ring magnet

Specification / characteristics - MP 10x4.3x4 / N38 - ring magnet

properties
properties values
Cat. no. 030178
GTIN/EAN 5906301811954
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 10 mm [±0,1 mm]
internal diameter Ø 4.3 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 1.92 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.28 kg / 22.35 N
Magnetic Induction ~ ? 386.91 mT / 3869 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 10x4.3x4 / N38 - ring 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

Technical simulation of the assembly - technical parameters

The following information constitute the outcome of a physical analysis. Results are based on models for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - characteristics
MP 10x4.3x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6115 Gs
611.5 mT
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
 medium risk
1 mm 4915 Gs
491.5 mT
 1.47 kg / 3.25 LBS
1473.3 g / 14.5 N
 safe
2 mm 3833 Gs
383.3 mT
 0.90 kg / 1.97 LBS
895.7 g / 8.8 N
 safe
3 mm 2949 Gs
294.9 mT
 0.53 kg / 1.17 LBS
530.3 g / 5.2 N
 safe
5 mm 1761 Gs
176.1 mT
 0.19 kg / 0.42 LBS
189.1 g / 1.9 N
 safe
10 mm 612 Gs
61.2 mT
 0.02 kg / 0.05 LBS
22.8 g / 0.2 N
 safe
15 mm 284 Gs
28.4 mT
 0.00 kg / 0.01 LBS
4.9 g / 0.0 N
 safe
20 mm 157 Gs
15.7 mT
 0.00 kg / 0.00 LBS
1.5 g / 0.0 N
 safe
30 mm 64 Gs
6.4 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 safe
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Grip strength drops sharply with every subsequent millimeter of distance. Keep in mind that even a very thin break (e.g., dirt, paint, rust) noticeably reduces the pull force. Magnets work optimally during direct contact; distance nullifies the power. Observe how flashily the pull force drop, when the magnet does not adhere directly to the metal substrate. When designing the assembly, eliminate additional spacers.

Table 2: Vertical load (vertical surface)
MP 10x4.3x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.46 kg / 1.01 LBS
456.0 g / 4.5 N
1 mm Stal (~0.2) 0.29 kg / 0.65 LBS
294.0 g / 2.9 N
2 mm Stal (~0.2) 0.18 kg / 0.40 LBS
180.0 g / 1.8 N
3 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
5 mm Stal (~0.2) 0.04 kg / 0.08 LBS
38.0 g / 0.4 N
10 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section defines the approximate weight limit needed to initiate the downward movement of the magnet downwards on a upright steel wall (considering standard friction coefficient). The holding force is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 10x4.3x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.68 kg / 1.51 LBS
684.0 g / 6.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.46 kg / 1.01 LBS
456.0 g / 4.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.50 LBS
228.0 g / 2.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.14 kg / 2.51 LBS
1140.0 g / 11.2 N
When mounting a magnet on a upright plane (e.g., a board), it you can count on barely about 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient mean that holders slip easier than they pull off. Planning a wall mount? Remember that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slip down under a noticeably lighter cargo. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MP 10x4.3x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.23 kg / 0.50 LBS
228.0 g / 2.2 N
1 mm
25%
 0.57 kg / 1.26 LBS
570.0 g / 5.6 N
2 mm
50%
 1.14 kg / 2.51 LBS
1140.0 g / 11.2 N
3 mm
75%
 1.71 kg / 3.77 LBS
1710.0 g / 16.8 N
5 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
10 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
11 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
12 mm
100%
 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
A thin metal plate is unable to absorb the entire magnetic field, which weakens actual performance of the magnet. If you install a neodymium to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's power, you need a suitably thick element of steel. The material oversaturation means that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - resistance threshold
MP 10x4.3x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
 OK
40 °C -2.2% 2.23 kg / 4.92 LBS
2229.8 g / 21.9 N
 OK
60 °C -4.4% 2.18 kg / 4.81 LBS
2179.7 g / 21.4 N
 OK
80 °C -6.6% 2.13 kg / 4.69 LBS
2129.5 g / 20.9 N
100 °C -28.8% 1.62 kg / 3.58 LBS
1623.4 g / 15.9 N
Classic neodymiums change their properties power after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently damage this magnet. With increasing heat, the magnet's capacity temporarily decreases. Avoid using this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will lead to destruction of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MP 10x4.3x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.93 kg / 28.50 LBS
6 169 Gs
1.94 kg / 4.27 LBS
1939 g / 19.0 N
 N/A
1 mm 10.50 kg / 23.16 LBS
11 025 Gs
1.58 kg / 3.47 LBS
1576 g / 15.5 N
 9.45 kg / 20.84 LBS
~0 Gs
2 mm 8.35 kg / 18.41 LBS
9 831 Gs
1.25 kg / 2.76 LBS
1253 g / 12.3 N
 7.52 kg / 16.57 LBS
~0 Gs
3 mm 6.55 kg / 14.43 LBS
8 703 Gs
0.98 kg / 2.17 LBS
982 g / 9.6 N
 5.89 kg / 12.99 LBS
~0 Gs
5 mm 3.91 kg / 8.63 LBS
6 729 Gs
0.59 kg / 1.29 LBS
587 g / 5.8 N
 3.52 kg / 7.76 LBS
~0 Gs
10 mm 1.07 kg / 2.36 LBS
3 522 Gs
0.16 kg / 0.35 LBS
161 g / 1.6 N
 0.96 kg / 2.13 LBS
~0 Gs
20 mm 0.13 kg / 0.29 LBS
1 223 Gs
0.02 kg / 0.04 LBS
19 g / 0.2 N
 0.12 kg / 0.26 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
194 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
129 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
91 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
66 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
50 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
39 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets attract each other from a much further distance than a magnet and steel setup. Such a system of two magnets generates a stronger field and a wider radius of action. Designing a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is massive. The levitation is a bit weaker than the connection force, but still impressive.
*The magnetic induction between like poles drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Calculations show friction force of two matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
MP 10x4.3x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a large risk to electronics as well as pacemakers. These neodymiums generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MP 10x4.3x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.97 km/h
(9.71 m/s)
 0.09 J
30 mm 60.20 km/h
(16.72 m/s)
 0.27 J
50 mm 77.71 km/h
(21.59 m/s)
 0.45 J
100 mm 109.90 km/h
(30.53 m/s)
 0.89 J
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
MP 10x4.3x4 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MP 10x4.3x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 017 Mx 40.2 µWb
Pc Coefficient 1.44 High (Stable)
Total magnetic flux passing through the magnet pole. Key data when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MP 10x4.3x4 / N38

Environment Effective steel pull Effect
Air (land) 2.28 kg Standard
Water (riverbed) 2.61 kg
(+0.33 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. Shear force

*Note: On a vertical wall, the magnet holds only ~20% of its max power.

2. Steel thickness impact

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

3. Thermal stability

*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) = 1.44

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.

Engineering data and GPSR
Elemental analysis
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: 030178-2026
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The ring-shaped magnet MP 10x4.3x4 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 10x4.3x4 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø10x4 mm and a weight of 1.92 g. The pulling force of this model is an impressive 2.28 kg, which translates to 22.35 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 4.3 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • Their magnetic field is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • They possess excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
  • A magnet with a shiny gold surface looks better,
  • Magnets are characterized by very high magnetic induction on the surface,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the ability of free molding and customization to custom solutions, neodymium magnets can be produced in a wide range of geometric configurations, which increases their versatility,
  • Key role in future technologies – they are used in hard drives, electromotive mechanisms, medical equipment, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity was defined for optimal configuration, including:
  • using a plate made of low-carbon steel, functioning as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by working environment parameters, mainly (from most important):
  • Clearance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Serious injuries

Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Protect data

Very strong magnetic fields can destroy records on payment cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.

Handling rules

Handle magnets consciously. Their immense force can shock even experienced users. Plan your moves and do not underestimate their force.

Fire risk

Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Magnets are brittle

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Do not overheat magnets

Do not overheat. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Compass and GPS

A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Keep magnets near a smartphone to prevent damaging the sensors.

Life threat

Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.

Do not give to children

Strictly keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are life-threatening.

Caution! More info about hazards in the article: Safety of working with magnets.