Neodymium magnets – most powerful on the market

Need reliable magnetic field? Our range includes complete range of disc, cylindrical and ring magnets. Perfect for for home use, workshop and industrial tasks. Check our offer in stock.

check price list and dimensions

Magnet fishing: solid F200/F400 sets

Begin your hobby involving underwater treasure hunting! Our double-handle grips (F200, F400) provide safety guarantee and immense power. Solid, corrosion-resistant housing and reinforced ropes are reliable in challenging water conditions.

find your water magnet

Professional threaded grips

Reliable solutions for mounting without drilling. Threaded grips (external or internal) guarantee instant organization of work on production halls. They are indispensable mounting lamps, detectors and banners.

check technical specs

📦 Fast shipping: buy by 14:00, package goes out today!

Dhit sp. z o.o.
Product available Ships tomorrow

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

bulk discounts:

Need more?

price from 1 pcs
0.850 ZŁ
1.045 ZŁ
price from 800 pcs
0.799 ZŁ
0.983 ZŁ
price from 3000 pcs
0.748 ZŁ
0.920 ZŁ
Want to negotiate?

Pick up the phone and ask +48 22 499 98 98 or send us a note via request form through our site.
Specifications and structure of a magnet can be calculated using our power calculator.

Orders submitted before 14:00 will be dispatched today!

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

Engineering modeling of the assembly - report

The following data constitute the direct effect of a mathematical calculation. Values are based on models for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static force (pull 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
warning
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: Shear force (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: Wall mounting (shearing) - 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: 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 resistance (stability) - 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

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 10x4.3x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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
Timepiece 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: 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: Corrosion resistance
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: Hydrostatics and buoyancy
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds merely a fraction of its max power.

2. Plate thickness effect

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

3. Heat tolerance

*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.

Technical and environmental data
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
Magnet Unit Converter
Pulling force

Magnetic Induction

See more proposals

It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 2.28 kg works great as a door latch, speaker holder, or spacer element in devices.
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. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for indoor 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. 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. 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.
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. 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 and weaknesses of neodymium magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after approximately ten years it drops only by ~1% (theoretically),
  • They do not lose their magnetic properties even under close interference source,
  • A magnet with a metallic gold surface is more attractive,
  • Magnets have impressive magnetic induction on the working surface,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the capacity to customize to individual projects,
  • Universal use in modern industrial fields – they are commonly used in HDD drives, drive modules, medical devices, as well as modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose power 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 very 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 resistant to moisture, in case of application outdoors
  • Limited ability of producing threads in the magnet and complex shapes - recommended is casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price is higher than average,

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

Holding force of 2.28 kg is a measurement result performed under specific, ideal conditions:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • with a cross-section of at least 10 mm
  • with a surface cleaned and smooth
  • without any insulating layer between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • at standard ambient temperature

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity results from a number of factors, listed from crucial:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin sheet does not accept the full field, causing part of the flux to be lost into the air.
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Warning for allergy sufferers

A percentage of the population suffer from a sensitization to Ni, which is the common plating for neodymium magnets. Prolonged contact can result in a rash. We suggest use protective gloves.

Magnetic media

Do not bring magnets close to a wallet, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.

Do not drill into magnets

Powder produced during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Product not for children

Always keep magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.

Fragile material

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Crushing force

Large magnets can smash fingers in a fraction of a second. Never place your hand betwixt two attracting surfaces.

Magnetic interference

An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a smartphone to avoid breaking the sensors.

Warning for heart patients

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Safe operation

Handle magnets consciously. Their immense force can surprise even professionals. Plan your moves and do not underestimate their force.

Danger! 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