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MP 8x6/3.5x3 / N38 - ring magnet

ring magnet

Catalog no 030206

GTIN/EAN: 5906301812234

5.00

Diameter

8 mm [±0,1 mm]

internal diameter Ø

6/3.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

0.91 g

Magnetization Direction

↑ axial

Load capacity

1.37 kg / 13.48 N

Magnetic Induction

371.53 mT / 3715 Gs

Coating

[NiCuNi] Nickel

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0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Detailed specification - MP 8x6/3.5x3 / N38 - ring magnet

Specification / characteristics - MP 8x6/3.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030206
GTIN/EAN 5906301812234
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 8 mm [±0,1 mm]
internal diameter Ø 6/3.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 0.91 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.37 kg / 13.48 N
Magnetic Induction ~ ? 371.53 mT / 3715 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 8x6/3.5x3 / 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 analysis of the magnet - technical parameters

Presented data are the outcome of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Actual performance may differ. Treat these data as a reference point for designers.

Table 1: Static force (pull vs distance) - interaction chart
MP 8x6/3.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3327 Gs
332.7 mT
 1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
 weak grip
1 mm 2612 Gs
261.2 mT
 0.84 kg / 1.86 pounds
844.4 g / 8.3 N
 weak grip
2 mm 1884 Gs
188.4 mT
 0.44 kg / 0.97 pounds
439.3 g / 4.3 N
 weak grip
3 mm 1310 Gs
131.0 mT
 0.21 kg / 0.47 pounds
212.4 g / 2.1 N
 weak grip
5 mm 637 Gs
63.7 mT
 0.05 kg / 0.11 pounds
50.3 g / 0.5 N
 weak grip
10 mm 151 Gs
15.1 mT
 0.00 kg / 0.01 pounds
2.8 g / 0.0 N
 weak grip
15 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 weak grip
20 mm 25 Gs
2.5 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
30 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Pulling power decreases significantly per each millimeter of gap. Remember that even the smallest gap (e.g., contamination, paint, rust) significantly diminishes the holding power. Magnets work strongest during direct contact; air break drastically cuts the power. Notice how flashily the load capacity fall, when the magnet does not adhere flatly to the steel surface. When calculating the assembly, discard additional spacers.

Table 2: Sliding hold (vertical surface)
MP 8x6/3.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.27 kg / 0.60 pounds
274.0 g / 2.7 N
1 mm Stal (~0.2) 0.17 kg / 0.37 pounds
168.0 g / 1.6 N
2 mm Stal (~0.2) 0.09 kg / 0.19 pounds
88.0 g / 0.9 N
3 mm Stal (~0.2) 0.04 kg / 0.09 pounds
42.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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
This section defines the approximate shear load necessary to initiate the slippage of the magnet down along a upright steel wall (assuming typical friction). This value is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 8x6/3.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.41 kg / 0.91 pounds
411.0 g / 4.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.27 kg / 0.60 pounds
274.0 g / 2.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.14 kg / 0.30 pounds
137.0 g / 1.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.69 kg / 1.51 pounds
685.0 g / 6.7 N
When mounting a holder on a vertical plane (e.g., a board), it will maintain only about 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that magnets slide down easier than they detach. Planning a wall mount? Consider that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will give way down under a noticeably lighter load. Application of an anti-slip pad can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MP 8x6/3.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.14 kg / 0.30 pounds
137.0 g / 1.3 N
1 mm
25%
 0.34 kg / 0.76 pounds
342.5 g / 3.4 N
2 mm
50%
 0.69 kg / 1.51 pounds
685.0 g / 6.7 N
3 mm
75%
 1.03 kg / 2.27 pounds
1027.5 g / 10.1 N
5 mm
100%
 1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
10 mm
100%
 1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
11 mm
100%
 1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
12 mm
100%
 1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
A thin sheet is unable to take in the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To achieve 100% of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the holder works worse. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (stability) - power drop
MP 8x6/3.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
 OK
40 °C -2.2% 1.34 kg / 2.95 pounds
1339.9 g / 13.1 N
 OK
60 °C -4.4% 1.31 kg / 2.89 pounds
1309.7 g / 12.8 N
80 °C -6.6% 1.28 kg / 2.82 pounds
1279.6 g / 12.6 N
100 °C -28.8% 0.98 kg / 2.15 pounds
975.4 g / 9.6 N
Ordinary NdFeB products change their properties strength above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this magnet. As the temperature rises, the magnet's power temporarily decreases. Do not use this magnet close to ovens higher than its safe range. Too high temperature will lead to permanent loss of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than long magnets. The danger warning in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 8x6/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.36 kg / 5.20 pounds
4 867 Gs
0.35 kg / 0.78 pounds
354 g / 3.5 N
 N/A
1 mm 1.90 kg / 4.20 pounds
5 981 Gs
0.29 kg / 0.63 pounds
286 g / 2.8 N
 1.71 kg / 3.78 pounds
~0 Gs
2 mm 1.45 kg / 3.20 pounds
5 223 Gs
0.22 kg / 0.48 pounds
218 g / 2.1 N
 1.31 kg / 2.88 pounds
~0 Gs
3 mm 1.06 kg / 2.34 pounds
4 468 Gs
0.16 kg / 0.35 pounds
159 g / 1.6 N
 0.96 kg / 2.11 pounds
~0 Gs
5 mm 0.53 kg / 1.16 pounds
3 148 Gs
0.08 kg / 0.17 pounds
79 g / 0.8 N
 0.47 kg / 1.05 pounds
~0 Gs
10 mm 0.09 kg / 0.19 pounds
1 274 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.17 pounds
~0 Gs
20 mm 0.00 kg / 0.01 pounds
301 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
27 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
16 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
10 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
7 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
5 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
4 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a significantly greater distance than a neodymium and metal setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of operation. Want to build a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is massive. The levitation is slightly lower than the connection force, but still impressive.
*Flux density between like poles reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Note: Estimates show shear force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MP 8x6/3.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Mechanical watch 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a real danger to electronic devices as well as pacemakers. These NdFeB products produce a field that disrupts operation of digital equipment. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MP 8x6/3.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 39.18 km/h
(10.88 m/s)
 0.05 J
30 mm 67.78 km/h
(18.83 m/s)
 0.16 J
50 mm 87.50 km/h
(24.31 m/s)
 0.27 J
100 mm 123.74 km/h
(34.37 m/s)
 0.54 J
NdFeB products are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Surface protection spec
MP 8x6/3.5x3 / 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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MP 8x6/3.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 299 Mx 13.0 µWb
Pc Coefficient 0.46 Low (Flat)
Flux value passing through the pole surface. Essential parameter in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 8x6/3.5x3 / N38

Environment Effective steel pull Effect
Air (land) 1.37 kg Standard
Water (riverbed) 1.57 kg
(+0.20 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains merely a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Heat tolerance

*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) = 0.46

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.

Engineering data and GPSR
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%
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: 030206-2026
Measurement Calculator
Magnet pull force
Magnetic Field
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The ring magnet with a hole MP 8x6/3.5x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 1.37 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 8x6/3.5x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain great sensitivity. 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.
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.
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 (8 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø8 mm (outer diameter) and height 3 mm. The key parameter here is the holding force amounting to approximately 1.37 kg (force ~13.48 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 6/3.5 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well protect themselves against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a smooth nickel surface is more attractive,
  • Magnets are distinguished by very high magnetic induction on the working surface,
  • 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...
  • Possibility of detailed forming and optimizing to complex applications,
  • Fundamental importance in high-tech industry – they are used in HDD drives, electric drive systems, precision medical tools, and multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. 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 strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mechanism.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

The force parameter is a result of laboratory testing executed under standard conditions:
  • using a sheet made of mild steel, serving as a magnetic yoke
  • with a thickness of at least 10 mm
  • with a surface cleaned and smooth
  • with total lack of distance (no coatings)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Real force is affected by specific conditions, such as (from most important):
  • Gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Steel thickness – too thin plate does not accept the full field, causing part of the flux to be escaped to the other side.
  • Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Finger safety

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

Choking Hazard

Neodymium magnets are not toys. Eating multiple magnets can lead to them pinching intestinal walls, which poses a severe health hazard and requires urgent medical intervention.

Sensitization to coating

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease working with magnets and wear gloves.

Magnets are brittle

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Keep away from computers

Intense magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of min. 10 cm.

Conscious usage

Handle with care. Neodymium magnets attract from a long distance and snap with massive power, often quicker than you can react.

Keep away from electronics

Note: neodymium magnets produce a field that confuses sensitive sensors. Keep a separation from your mobile, device, and GPS.

Do not drill into magnets

Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Health Danger

Individuals with a heart stimulator must maintain an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Heat sensitivity

Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Caution! Looking for details? Check our post: Why are neodymium magnets dangerous?