Product available Ships tomorrow

MP 10x6x4 / N38 - ring magnet

ring magnet

Catalog no 030179

GTIN/EAN: 5906301811961

5.00

Diameter

10 mm [±0,1 mm]

internal diameter Ø

6 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

1.51 g

Magnetization Direction

↑ axial

Load capacity

1.79 kg / 17.55 N

Magnetic Induction

386.91 mT / 3869 Gs

Coating

[NiCuNi] Nickel

0.898 with VAT / pcs + price for transport

0.730 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
0.730 ZŁ
0.898 ZŁ
price from 900 pcs
0.686 ZŁ
0.844 ZŁ
price from 3500 pcs
0.642 ZŁ
0.790 ZŁ
Want to talk magnets?

Contact us by phone +48 22 499 98 98 or get in touch by means of contact form the contact section.
Specifications as well as shape of a magnet can be reviewed on our online calculation tool.

Orders submitted before 14:00 will be dispatched today!

Detailed specification - MP 10x6x4 / N38 - ring magnet

Specification / characteristics - MP 10x6x4 / N38 - ring magnet

properties
properties values
Cat. no. 030179
GTIN/EAN 5906301811961
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 6 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 1.51 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.79 kg / 17.55 N
Magnetic Induction ~ ? 386.91 mT / 3869 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 10x6x4 / 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 analysis of the magnet - report

Presented values constitute the result of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
MP 10x6x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6115 Gs
611.5 mT
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
weak grip
1 mm 4915 Gs
491.5 mT
1.16 kg / 2.55 pounds
1156.7 g / 11.3 N
weak grip
2 mm 3833 Gs
383.3 mT
0.70 kg / 1.55 pounds
703.2 g / 6.9 N
weak grip
3 mm 2949 Gs
294.9 mT
0.42 kg / 0.92 pounds
416.3 g / 4.1 N
weak grip
5 mm 1761 Gs
176.1 mT
0.15 kg / 0.33 pounds
148.5 g / 1.5 N
weak grip
10 mm 612 Gs
61.2 mT
0.02 kg / 0.04 pounds
17.9 g / 0.2 N
weak grip
15 mm 284 Gs
28.4 mT
0.00 kg / 0.01 pounds
3.9 g / 0.0 N
weak grip
20 mm 157 Gs
15.7 mT
0.00 kg / 0.00 pounds
1.2 g / 0.0 N
weak grip
30 mm 64 Gs
6.4 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
weak grip
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip

Table 2: Vertical load (vertical surface)
MP 10x6x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.36 kg / 0.79 pounds
358.0 g / 3.5 N
1 mm Stal (~0.2) 0.23 kg / 0.51 pounds
232.0 g / 2.3 N
2 mm Stal (~0.2) 0.14 kg / 0.31 pounds
140.0 g / 1.4 N
3 mm Stal (~0.2) 0.08 kg / 0.19 pounds
84.0 g / 0.8 N
5 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 10x6x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.54 kg / 1.18 pounds
537.0 g / 5.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.36 kg / 0.79 pounds
358.0 g / 3.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.18 kg / 0.39 pounds
179.0 g / 1.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.90 kg / 1.97 pounds
895.0 g / 8.8 N

Table 4: Material efficiency (saturation) - sheet metal selection
MP 10x6x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.18 kg / 0.39 pounds
179.0 g / 1.8 N
1 mm
25%
0.45 kg / 0.99 pounds
447.5 g / 4.4 N
2 mm
50%
0.90 kg / 1.97 pounds
895.0 g / 8.8 N
3 mm
75%
1.34 kg / 2.96 pounds
1342.5 g / 13.2 N
5 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
10 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
11 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
12 mm
100%
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N

Table 5: Thermal resistance (material behavior) - resistance threshold
MP 10x6x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
OK
40 °C -2.2% 1.75 kg / 3.86 pounds
1750.6 g / 17.2 N
OK
60 °C -4.4% 1.71 kg / 3.77 pounds
1711.2 g / 16.8 N
OK
80 °C -6.6% 1.67 kg / 3.69 pounds
1671.9 g / 16.4 N
100 °C -28.8% 1.27 kg / 2.81 pounds
1274.5 g / 12.5 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 10x6x4 / 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 pounds
6 169 Gs
1.94 kg / 4.27 pounds
1939 g / 19.0 N
N/A
1 mm 10.50 kg / 23.16 pounds
11 025 Gs
1.58 kg / 3.47 pounds
1576 g / 15.5 N
9.45 kg / 20.84 pounds
~0 Gs
2 mm 8.35 kg / 18.41 pounds
9 831 Gs
1.25 kg / 2.76 pounds
1253 g / 12.3 N
7.52 kg / 16.57 pounds
~0 Gs
3 mm 6.55 kg / 14.43 pounds
8 703 Gs
0.98 kg / 2.17 pounds
982 g / 9.6 N
5.89 kg / 12.99 pounds
~0 Gs
5 mm 3.91 kg / 8.63 pounds
6 729 Gs
0.59 kg / 1.29 pounds
587 g / 5.8 N
3.52 kg / 7.76 pounds
~0 Gs
10 mm 1.07 kg / 2.36 pounds
3 522 Gs
0.16 kg / 0.35 pounds
161 g / 1.6 N
0.96 kg / 2.13 pounds
~0 Gs
20 mm 0.13 kg / 0.29 pounds
1 223 Gs
0.02 kg / 0.04 pounds
19 g / 0.2 N
0.12 kg / 0.26 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
194 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
129 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
91 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
66 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
50 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
39 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (electronics) - warnings
MP 10x6x4 / 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
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 10x6x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.94 km/h
(9.71 m/s)
0.07 J
30 mm 60.15 km/h
(16.71 m/s)
0.21 J
50 mm 77.64 km/h
(21.57 m/s)
0.35 J
100 mm 109.80 km/h
(30.50 m/s)
0.70 J

Table 9: Corrosion resistance
MP 10x6x4 / 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 (Flux)
MP 10x6x4 / 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 10x6x4 / N38

Environment Effective steel pull Effect
Air (land) 1.79 kg Standard
Water (riverbed) 2.05 kg
(+0.26 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

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

2. Plate thickness effect

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

3. Power loss vs temp

*For N38 grade, 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.

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%
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: 030179-2026
Magnet Unit Converter
Magnet pull force

Field Strength

View also products

The ring magnet with a hole MP 10x6x4 / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. 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 caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure 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 easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
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 key parameter here is the lifting capacity amounting to approximately 1.79 kg (force ~17.55 N). The mounting hole diameter is precisely 6 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets generate maximum magnetic induction on a small area, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in designing and the ability to customize to specific needs,
  • Universal use in innovative solutions – they are commonly used in computer drives, brushless drives, diagnostic systems, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices

Limitations

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat contributes to it?

The specified lifting capacity concerns the maximum value, obtained under optimal environment, specifically:
  • using a plate made of mild steel, acting as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with a surface cleaned and smooth
  • under conditions of ideal adhesion (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

It is worth knowing that the magnet holding will differ influenced by elements below, in order of importance:
  • Distance – existence of any layer (rust, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safe handling of neodymium magnets
Protect data

Very strong magnetic fields can erase data on credit cards, hard drives, and storage devices. Stay away of min. 10 cm.

Pinching danger

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, crushing anything in their path. Be careful!

Precision electronics

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Nickel allergy

Some people suffer from a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Prolonged contact may cause dermatitis. We suggest use safety gloves.

Heat sensitivity

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Choking Hazard

NdFeB magnets are not suitable for play. Accidental ingestion of multiple magnets can lead to them attracting across intestines, which poses a severe health hazard and requires immediate surgery.

Health Danger

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Do not underestimate power

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

Eye protection

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them cracking into shards.

Combustion hazard

Dust created during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Important! Need more info? Read our article: Why are neodymium magnets dangerous?