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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

see specifications »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Lifting power as well as structure of a neodymium magnet can be calculated on our our magnetic calculator.

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Product card - 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 - technical parameters

These data represent the result of a engineering calculation. Results are based on algorithms for the material Nd2Fe14B. Operational conditions may differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - 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
Magnetic force weakens significantly with every mm of spacing. Keep in mind that every additional insulation layer (e.g., dirt, varnish, dust) strongly diminishes the holding power. Magnets work optimally at the point of direct contact; gap nullifies the force. Analyze how quickly the load capacity fall, when the product does not touch directly to the metal substrate. When planning the mounting, discard unnecessary gaps.

Table 2: Shear 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
The following data calculates the approximate holding capacity needed to start the downward movement of the magnet down along a upright steel plate (considering typical friction coefficient). The holding force is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (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 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 element on a vertical wall (e.g., a car body), it you can count on barely about 20%-30% of its nominal power. Gravity as well as a weak degree of grip cause that holders slip easier than they detach. Want to create a wall mount? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a noticeably lighter weight. Application of an anti-slip coating can effectively increase the grip.

Table 4: Steel thickness (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 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 metal plate cannot take in the full magnetic flux, which wastes potential of the magnet. If you install a neodymium to a thin surface, the field will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this magnet's power, you require a sufficiently solid element of metal. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal resistance (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
Classic neodymiums irreversibly lose power above the temperature limit. Avoid high temperatures – heat can permanently damage this magnet. With every degree above norm, the neodymium's force momentarily drops. Refrain from using this product near heat sources higher than its operating temperature limit. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table points to 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) 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 attract each other from a wider radius than a neodymium and metal setup. Such a system of two magnets creates a more powerful interaction and a wider radius of operation. Want to build a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the impact force is extreme. The repulsion force is a bit weaker than the connection force, but still impressive.
*Field value between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
* Figures apply to friction force of two matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
Phone / Smartphone 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
Powerful magnet radiation is a serious hazard to electronic devices as well as pacemakers. These neodymiums produce a field that disrupts operation of digital equipment. Notice: the unseen radiation acts through matter and plastic. Special caution must be exercised by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, 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
NdFeB products are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or injury to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with powerful specimens.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
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 passing through the pole surface. Key data in coil applications and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
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%
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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

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

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Temperature resistance

*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) = 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
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%
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: 030206-2026
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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. 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 very brittle 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 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.
A screw or bolt with a thread diameter smaller than 6/3.5 mm fits this model. 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.
This model is characterized by dimensions Ø8x3 mm and a weight of 0.91 g. The pulling force of this model is an impressive 1.37 kg, which translates to 13.48 N in newtons. The mounting hole diameter is precisely 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. 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.

Advantages and disadvantages of neodymium magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • By using a reflective layer of nickel, the element has an elegant look,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • 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...
  • Considering the ability of flexible shaping and adaptation to specialized projects, neodymium magnets can be produced in a variety of forms and dimensions, which makes them more universal,
  • Universal use in modern technologies – they serve a role in HDD drives, electromotive mechanisms, medical devices, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Disadvantages

Problematic aspects of neodymium magnets: tips and applications.
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Highest magnetic holding force – what contributes to it?

Holding force of 1.37 kg is a result of laboratory testing conducted under specific, ideal conditions:
  • on a base made of structural steel, effectively closing the magnetic field
  • with a cross-section minimum 10 mm
  • with an ground contact surface
  • without the slightest clearance between the magnet and steel
  • under axial force vector (90-degree angle)
  • in stable room temperature

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding may be lower influenced by the following factors, in order of importance:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Operating temperature – NdFeB sinters 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 assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Fire risk

Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Respect the power

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Health Danger

People with a heart stimulator should keep an absolute distance from magnets. The magnetism can disrupt the operation of the implant.

Adults only

Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Safe distance

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Skin irritation risks

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands and opt for versions in plastic housing.

GPS Danger

Note: neodymium magnets generate a field that interferes with precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Physical harm

Large magnets can smash fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Thermal limits

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Fragile material

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets will cause them breaking into shards.

Safety First! Details about risks in the article: Safety of working with magnets.