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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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Technical data - 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 - data

Presented values represent the direct effect of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static 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
medium risk
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: Shear force (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: Steel thickness (substrate influence) - 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 resistance (stability) - power drop
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: Magnet-Magnet interaction (attraction) - field collision
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: Protective zones (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: Dynamics (kinetic energy) - 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: Coating parameters (durability)
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: Submerged application
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Warning: On a vertical surface, the magnet holds just ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Thermal stability

*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

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.

Technical specification and ecology
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%
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: 030178-2026
Quick Unit Converter
Magnet pull force

Field Strength

View more proposals

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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. 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 inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 4.3 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 10 mm and thickness 4 mm. 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. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain attractive force for around ten years – the loss is just ~1% (in theory),
  • Neodymium magnets prove to be remarkably resistant to demagnetization caused by external interference,
  • By using a shiny coating of gold, the element has an elegant look,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which allows for strong attraction,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the ability to adapt to complex applications,
  • Versatile presence in innovative solutions – they are utilized in hard drives, electromotive mechanisms, medical devices, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Weaknesses

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • Neodymium magnets demagnetize 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 usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Magnetic strength at its maximum – what contributes to it?

Information about lifting capacity was defined for optimal configuration, taking into account:
  • on a base made of structural steel, perfectly concentrating the magnetic flux
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a surface free of scratches
  • with total lack of distance (no coatings)
  • for force applied at a right angle (in the magnet axis)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

During everyday use, the real power results from many variables, listed from the most important:
  • Air gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate decreases the load capacity.

Warnings
Safe operation

Be careful. Rare earth magnets attract from a distance and connect with huge force, often faster than you can react.

Electronic devices

Do not bring magnets near a purse, computer, or TV. The magnetic field can destroy these devices and wipe information from cards.

Magnetic interference

An intense magnetic field interferes with the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent breaking the sensors.

Skin irritation risks

Certain individuals have a contact allergy to Ni, which is the common plating for NdFeB magnets. Prolonged contact can result in dermatitis. We suggest wear protective gloves.

Warning for heart patients

Individuals with a ICD should maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Protective goggles

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Swallowing risk

Only for adults. Tiny parts pose a choking risk, leading to severe trauma. Store away from children and animals.

Pinching danger

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

Mechanical processing

Dust created during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Thermal limits

Keep cool. Neodymium magnets are sensitive to heat. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Important! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98