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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

product specifications »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Technical modeling of the assembly - report

These values are the direct effect of a physical analysis. Values were calculated on models for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these calculations as a reference point when designing systems.

Table 1: Static force (force vs distance) - power drop
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 LBS
1370.0 g / 13.4 N
 weak grip
1 mm 2612 Gs
261.2 mT
 0.84 kg / 1.86 LBS
844.4 g / 8.3 N
 weak grip
2 mm 1884 Gs
188.4 mT
 0.44 kg / 0.97 LBS
439.3 g / 4.3 N
 weak grip
3 mm 1310 Gs
131.0 mT
 0.21 kg / 0.47 LBS
212.4 g / 2.1 N
 weak grip
5 mm 637 Gs
63.7 mT
 0.05 kg / 0.11 LBS
50.3 g / 0.5 N
 weak grip
10 mm 151 Gs
15.1 mT
 0.00 kg / 0.01 LBS
2.8 g / 0.0 N
 weak grip
15 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 LBS
0.4 g / 0.0 N
 weak grip
20 mm 25 Gs
2.5 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 weak grip
30 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
50 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Pulling power weakens sharply with every mm of spacing. Remember that even the smallest gap (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Neodymiums operate most effectively during direct contact; air break kills the power. Notice how quickly the parameters fall, when the product does not adhere directly to the steel surface. When planning the assembly, avoid unnecessary gaps.

Table 2: Shear force (wall)
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 LBS
274.0 g / 2.7 N
1 mm Stal (~0.2) 0.17 kg / 0.37 LBS
168.0 g / 1.6 N
2 mm Stal (~0.2) 0.09 kg / 0.19 LBS
88.0 g / 0.9 N
3 mm Stal (~0.2) 0.04 kg / 0.09 LBS
42.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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
The following data shows the estimated weight limit required to initiate the downward movement of the magnet down against a vertical steel plate (assuming typical friction coefficient). This parameter is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 LBS
411.0 g / 4.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.27 kg / 0.60 LBS
274.0 g / 2.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.14 kg / 0.30 LBS
137.0 g / 1.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.69 kg / 1.51 LBS
685.0 g / 6.7 N
When hanging a holder on a vertical surface (e.g., a car body), it will maintain barely about 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that products slip easier than they pop off the substrate. Designing a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter weight. Application of an anti-slip pad can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 LBS
137.0 g / 1.3 N
1 mm
25%
 0.34 kg / 0.76 LBS
342.5 g / 3.4 N
2 mm
50%
 0.69 kg / 1.51 LBS
685.0 g / 6.7 N
3 mm
75%
 1.03 kg / 2.27 LBS
1027.5 g / 10.1 N
5 mm
100%
 1.37 kg / 3.02 LBS
1370.0 g / 13.4 N
10 mm
100%
 1.37 kg / 3.02 LBS
1370.0 g / 13.4 N
11 mm
100%
 1.37 kg / 3.02 LBS
1370.0 g / 13.4 N
12 mm
100%
 1.37 kg / 3.02 LBS
1370.0 g / 13.4 N
A thin sheet is incapable of absorb the entire magnetic field, which weakens actual performance of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To squeeze 100% of this magnet's potential, you require a sufficiently solid piece of steel. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
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 LBS
1370.0 g / 13.4 N
 OK
40 °C -2.2% 1.34 kg / 2.95 LBS
1339.9 g / 13.1 N
 OK
60 °C -4.4% 1.31 kg / 2.89 LBS
1309.7 g / 12.8 N
80 °C -6.6% 1.28 kg / 2.82 LBS
1279.6 g / 12.6 N
100 °C -28.8% 0.98 kg / 2.15 LBS
975.4 g / 9.6 N
Standard neodymium magnets change their properties power above the temperature limit. Watch out for overheating – heat can irreversibly demagnetize this product. With increasing heat, the neodymium's power momentarily decreases. Refrain from using this magnet in hot environments higher than its safe range. Ignoring the limit will result in destruction of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently sooner than long magnets. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.36 kg / 5.20 LBS
4 867 Gs
0.35 kg / 0.78 LBS
354 g / 3.5 N
 N/A
1 mm 1.90 kg / 4.20 LBS
5 981 Gs
0.29 kg / 0.63 LBS
286 g / 2.8 N
 1.71 kg / 3.78 LBS
~0 Gs
2 mm 1.45 kg / 3.20 LBS
5 223 Gs
0.22 kg / 0.48 LBS
218 g / 2.1 N
 1.31 kg / 2.88 LBS
~0 Gs
3 mm 1.06 kg / 2.34 LBS
4 468 Gs
0.16 kg / 0.35 LBS
159 g / 1.6 N
 0.96 kg / 2.11 LBS
~0 Gs
5 mm 0.53 kg / 1.16 LBS
3 148 Gs
0.08 kg / 0.17 LBS
79 g / 0.8 N
 0.47 kg / 1.05 LBS
~0 Gs
10 mm 0.09 kg / 0.19 LBS
1 274 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
20 mm 0.00 kg / 0.01 LBS
301 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
27 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
16 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
10 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
7 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
5 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
4 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and steel setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of operation. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The repulsion force is a bit weaker than the attraction, but still impressive.
*Flux density in repulsion mode reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
Note: Calculations show friction force of a pair of matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - 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
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Car key 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 poses a serious hazard to electronic devices and pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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 collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force 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 powerful specimens.

Table 9: Coating parameters (durability)
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)
Total magnetic flux emitted by the pole surface. Essential parameter for generator designers and motors. Pc value determines the working geometry.

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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.

3. Thermal stability

*For N38 material, 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
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: 030206-2026
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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. It is also often used in advertising for fixing signs and in workshops for organizing tools.
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. One turn too many can destroy the magnet, so do it slowly. 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. 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. 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 8 mm and thickness 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of rare earth magnets.

Pros

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They do not lose power, even during nearly 10 years – the drop in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets prove to be exceptionally resistant to demagnetization caused by external interference,
  • Thanks to the reflective finish, the layer of nickel, gold-plated, or silver gives an professional appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of exact machining as well as modifying to defined conditions,
  • Huge importance in modern industrial fields – they are commonly used in hard drives, motor assemblies, advanced medical instruments, as well as technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these products can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Best holding force of the magnet in ideal parameters – what it depends on?

Holding force of 1.37 kg is a theoretical maximum value performed under standard conditions:
  • using a base made of low-carbon steel, serving as a magnetic yoke
  • with a cross-section minimum 10 mm
  • with a surface free of scratches
  • without the slightest insulating layer between the magnet and steel
  • during detachment in a direction vertical to the plane
  • in neutral thermal conditions

Key elements affecting lifting force

Holding efficiency is affected by specific conditions, mainly (from most important):
  • Distance (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Bodily injuries

Large magnets can break fingers instantly. Do not place your hand betwixt two attracting surfaces.

Powerful field

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

GPS and phone interference

A strong magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets close to a smartphone to avoid breaking the sensors.

Machining danger

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Do not give to children

Absolutely store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are life-threatening.

Nickel coating and allergies

A percentage of the population have a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Prolonged contact might lead to a rash. We strongly advise use protective gloves.

Electronic devices

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Medical implants

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Beware of splinters

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Demagnetization risk

Control the heat. Exposing the magnet to high heat will ruin its properties and strength.

Warning! Details about hazards in the article: Safety of working with magnets.