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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

1.045 with VAT / pcs + price for transport

0.850 ZŁ net + 23% VAT / pcs

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Product card - 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

Engineering simulation of the product - technical parameters

Presented values constitute the direct effect of a engineering analysis. Values rely on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
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
strong
1 mm 4915 Gs
491.5 mT
1.47 kg / 3.25 lbs
1473.3 g / 14.5 N
low risk
2 mm 3833 Gs
383.3 mT
0.90 kg / 1.97 lbs
895.7 g / 8.8 N
low risk
3 mm 2949 Gs
294.9 mT
0.53 kg / 1.17 lbs
530.3 g / 5.2 N
low risk
5 mm 1761 Gs
176.1 mT
0.19 kg / 0.42 lbs
189.1 g / 1.9 N
low risk
10 mm 612 Gs
61.2 mT
0.02 kg / 0.05 lbs
22.8 g / 0.2 N
low risk
15 mm 284 Gs
28.4 mT
0.00 kg / 0.01 lbs
4.9 g / 0.0 N
low risk
20 mm 157 Gs
15.7 mT
0.00 kg / 0.00 lbs
1.5 g / 0.0 N
low risk
30 mm 64 Gs
6.4 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
low risk
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk

Table 2: Slippage load (wall)
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

Table 3: Wall mounting (sliding) - vertical pull
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

Table 4: Material efficiency (saturation) - sheet metal selection
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

Table 5: Thermal stability (material behavior) - thermal limit
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

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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

Table 7: Safety (HSE) (implants) - 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

Table 8: Impact energy (cracking risk) - collision effects
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

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)

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)

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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.44

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%
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
Measurement Calculator
Pulling force

Field Strength

Other offers

The ring magnet with a hole MP 10x4.3x4 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 2.28 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and easily scratched 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (10 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø10 mm (outer diameter) and height 4 mm. The pulling force of this model is an impressive 2.28 kg, which translates to 22.35 N in newtons. The mounting hole diameter is precisely 4.3 mm.
The poles are located on the planes with holes, not on the sides of the ring. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • A magnet with a shiny nickel surface has better aesthetics,
  • Magnetic induction on the working part of the magnet turns out to be maximum,
  • 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 modeling as well as adapting to individual conditions,
  • Universal use in innovative solutions – they are used in mass storage devices, electric drive systems, advanced medical instruments, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions

Cons

Characteristics of disadvantages of neodymium magnets and ways of using them
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer 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
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, small components of these products can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

The specified lifting capacity refers to the peak performance, recorded under ideal test conditions, namely:
  • using a base made of high-permeability steel, functioning as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • with a surface cleaned and smooth
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction vertical to the mounting surface
  • at room temperature

Determinants of practical lifting force of a magnet

Effective lifting capacity is influenced by working environment parameters, mainly (from priority):
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Serious injuries

Pinching hazard: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Fire risk

Machining of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Swallowing risk

These products are not toys. Swallowing several magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Medical implants

Warning for patients: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Precision electronics

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Warning for allergy sufferers

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and wear gloves.

Threat to electronics

Powerful magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Heat warning

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Powerful field

Use magnets consciously. Their immense force can surprise even professionals. Stay alert and respect their force.

Eye protection

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets will cause them breaking into small pieces.

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98