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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 - 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

Physical modeling of the magnet - report

Presented data constitute the outcome of a mathematical analysis. Results were calculated on models for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Treat these data as a reference point when designing systems.

Table 1: Static force (force vs gap) - 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
weak grip
2 mm 3833 Gs
383.3 mT
0.90 kg / 1.97 LBS
895.7 g / 8.8 N
weak grip
3 mm 2949 Gs
294.9 mT
0.53 kg / 1.17 LBS
530.3 g / 5.2 N
weak grip
5 mm 1761 Gs
176.1 mT
0.19 kg / 0.42 LBS
189.1 g / 1.9 N
weak grip
10 mm 612 Gs
61.2 mT
0.02 kg / 0.05 LBS
22.8 g / 0.2 N
weak grip
15 mm 284 Gs
28.4 mT
0.00 kg / 0.01 LBS
4.9 g / 0.0 N
weak grip
20 mm 157 Gs
15.7 mT
0.00 kg / 0.00 LBS
1.5 g / 0.0 N
weak grip
30 mm 64 Gs
6.4 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
weak grip
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Sliding capacity (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

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

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

Table 5: Thermal stability (material behavior) - 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 (repulsion) - field range
MP 10x4.3x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 (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
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Car key 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) - 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

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: Electrical data (Pc)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

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

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 material, the critical 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.

Technical specification and ecology
Material specification
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
Magnet Unit Converter
Pulling force

Field Strength

Other deals

The ring magnet with a hole MP 10x4.3x4 / N38 is created for mechanical fastening, 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. 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. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. 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 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.
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.
The poles are located on the planes with holes, not on the sides of the ring. 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain full power for around 10 years – the loss is just ~1% (according to analyses),
  • Magnets perfectly resist against loss of magnetization caused by foreign field sources,
  • By applying a smooth coating of gold, the element acquires an professional look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to freedom in forming and the capacity to customize to client solutions,
  • Fundamental importance in modern industrial fields – they are used in HDD drives, electric motors, diagnostic systems, as well as other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small components of these products are able to disrupt the diagnostic process medical after entering 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

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat affects it?

The lifting capacity listed is a theoretical maximum value executed under specific, ideal conditions:
  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • with a thickness minimum 10 mm
  • characterized by even structure
  • without the slightest clearance between the magnet and steel
  • under axial force vector (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Bear in mind that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Cast iron may attract less.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

H&S for magnets
Cards and drives

Very strong magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Do not overheat magnets

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Pacemakers

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

Machining danger

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Keep away from children

Strictly store magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are very dangerous.

Protective goggles

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Physical harm

Pinching hazard: The pulling power is so immense that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

Conscious usage

Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Keep away from electronics

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Warning for allergy sufferers

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and select encased magnets.

Attention! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98