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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

Technical analysis of the product - data

Presented data are the direct effect of a engineering simulation. Results are based on algorithms for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
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
 low risk
1 mm 2612 Gs
261.2 mT
 0.84 kg / 1.86 pounds
844.4 g / 8.3 N
 low risk
2 mm 1884 Gs
188.4 mT
 0.44 kg / 0.97 pounds
439.3 g / 4.3 N
 low risk
3 mm 1310 Gs
131.0 mT
 0.21 kg / 0.47 pounds
212.4 g / 2.1 N
 low risk
5 mm 637 Gs
63.7 mT
 0.05 kg / 0.11 pounds
50.3 g / 0.5 N
 low risk
10 mm 151 Gs
15.1 mT
 0.00 kg / 0.01 pounds
2.8 g / 0.0 N
 low risk
15 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 low risk
20 mm 25 Gs
2.5 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 low risk
30 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
50 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Pulling power weakens significantly with every mm of gap. Remember that even a very thin break (e.g., contamination, varnish, rust) significantly diminishes the holding power. Magnetic products work strongest in perfect adhesion; air break drastically cuts the power. Observe how flashily the pull force fall, when the magnet does not adhere directly to the steel surface. When designing the assembly, discard redundant distances.

Table 2: Slippage hold (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 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 theoretical shear load sufficient to start the shifting of the magnet downwards along a vertical metal surface (assuming typical friction coefficient). The holding force is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 hanging a magnet on a upright plane (e.g., a board), it will only hold barely approx. 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that products slip easier than they detach. Planning a hanger? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will slide down under a much lighter cargo. Utilizing a rubberized coating can significantly raise the stability.

Table 4: Material efficiency (saturation) - 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 too thin steel is unable to focus the full magnetic flux, which weakens actual performance of the holder. Should you attach a powerful product to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - 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 irreversibly lose parameters above the temperature limit. Protect against heat – heat can irreversibly destroy this magnet. With every degree above norm, the magnet's force briefly decreases. Avoid using this magnet close to heaters exceeding its working range. Ignoring the limit will result in irreversible degradation of magnetism.
*Important note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
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 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 magnetic products interact from a significantly greater distance than a magnet and sheet setup. Such a system of two magnets creates a more powerful interaction and a larger range of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is huge. The levitation is slightly lower than the attraction, but still impressive.
*Field value in repulsion mode reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Results show sliding force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
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
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
Extremely neodym field is a real danger to electronics and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field penetrates the body and plastic. Special caution must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
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
Neodymium magnets are delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Kinetic force can cause material chips or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the magnet. Use safety goggles when working with large magnets.

Table 9: Corrosion resistance
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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 emitted by the magnet pole. Key data in coil applications and motors. 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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains just ~20% of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly limits 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

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 specification and ecology
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%
Ecology and recycling (GPSR)
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 flexible washer 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 can be damaged 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.
The presented product is a ring magnet with dimensions Ø8 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 1.37 kg, which translates to 13.48 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 6/3.5 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose power, even during around 10 years – the reduction in power is only ~1% (theoretically),
  • Neodymium magnets are characterized by highly resistant to demagnetization caused by external interference,
  • By applying a shiny layer of nickel, the element acquires an aesthetic look,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to modularity in constructing and the capacity to modify to individual projects,
  • Huge importance in high-tech industry – they are utilized in data components, motor assemblies, advanced medical instruments, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Detachment force of the magnet in optimal conditions – what it depends on?

Magnet power was determined for optimal configuration, taking into account:
  • on a base made of structural steel, perfectly concentrating the magnetic flux
  • with a thickness no less than 10 mm
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • under vertical force direction (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

During everyday use, the actual holding force is determined by many variables, listed from the most important:
  • Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped to the other side.
  • Steel type – mild steel gives the best results. Higher carbon content decrease magnetic properties and lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed using a polished steel plate of optimal 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 holding force.

Safe handling of neodymium magnets
Electronic devices

Do not bring magnets close to a wallet, computer, or screen. The magnetic field can destroy these devices and erase data from cards.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent direct skin contact or select coated magnets.

No play value

Product intended for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep out of reach of children and animals.

Operating temperature

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

Safe operation

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

GPS and phone interference

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Dust explosion hazard

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Magnets are brittle

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Warning for heart patients

For implant holders: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Hand protection

Large magnets can crush fingers instantly. Do not place your hand between two strong magnets.

Danger! Learn more about hazards in the article: Magnet Safety Guide.