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MP 8x6/3.5x3 / N38 - ring magnet

ring magnet

Catalog no 030206

GTIN/EAN: 5906301812234

5.00
Load capacity 1.37 kg / 13.48 N Magnetic Induction 371.53 mT / 3715 Gs
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
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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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical - 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 product - report

Presented values represent the outcome of a physical simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters may differ. Use these calculations as a reference point when designing systems.

Table 1: Static 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
 safe
1 mm 2612 Gs
261.2 mT
 0.84 kg / 1.86 pounds
844.4 g / 8.3 N
 safe
2 mm 1884 Gs
188.4 mT
 0.44 kg / 0.97 pounds
439.3 g / 4.3 N
 safe
3 mm 1310 Gs
131.0 mT
 0.21 kg / 0.47 pounds
212.4 g / 2.1 N
 safe
5 mm 637 Gs
63.7 mT
 0.05 kg / 0.11 pounds
50.3 g / 0.5 N
 safe
10 mm 151 Gs
15.1 mT
 0.00 kg / 0.01 pounds
2.8 g / 0.0 N
 safe
15 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 safe
20 mm 25 Gs
2.5 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
30 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
50 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Grip strength drops significantly with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., dirt, varnish, rust) strongly weakens the grip. Magnetic products work strongest in perfect adhesion; distance nullifies the force. Notice how rapidly the pull force fall, when the product does not touch flatly to the metal substrate. When planning the arrangement, discard redundant distances.

Table 2: Vertical load (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 table below calculates the approximate force sufficient to start the downward movement of the magnet vertically along a vertical steel wall (assuming typical friction coefficient). This value depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (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 mounting a holder on a upright plane (e.g., a fridge), it will maintain just about 1/5 of its maximum pull force. Gravity and a low friction coefficient influence the fact that products slip faster than they pull off. Want to create a vertical fastening? Consider that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter load. Utilizing a rubberized coating can significantly raise the stability.

Table 4: Material efficiency (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 cannot take in the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze 100% of this neodymium's potential, you need a suitably thick element of metal. The material oversaturation causes that on thin elements (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - resistance threshold
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 lose parameters past the thermal threshold. Avoid high temperatures – heat can permanently damage this product. With every degree above norm, the neodymium's force briefly decreases. Refrain from using this product close to heaters exceeding its working range. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 8x6/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnet and sheet combination. The connection of two magnets generates a stronger field and a further horizon of action. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the collision energy is massive. The repulsion force is marginally weaker than the connection force, but still large.
*Field value between like poles drops to ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Results apply to friction force of a pair of same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - 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
A strong magnetic field poses a large risk to electronics as well as medical implants. These NdFeB products generate a flux that disrupts operation of sensitive medical devices. Notice: the unseen radiation penetrates the body and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.61 km/h
(7.11 m/s)
 0.02 J
30 mm 25.64 km/h
(7.12 m/s)
 0.02 J
50 mm 25.64 km/h
(7.12 m/s)
 0.02 J
100 mm 25.64 km/h
(7.12 m/s)
 0.02 J
Neodymium magnets are very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or injury to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with large magnets.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. 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 magnet pole. Key data in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
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.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

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

2. Steel saturation

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

3. Heat tolerance

*For N38 grade, the safety limit 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.

Engineering data and GPSR

Chemical composition

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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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 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 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. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 6/3.5 mm fits this model. 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. 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 key parameter here is the lifting capacity amounting to approximately 1.37 kg (force ~13.48 N). The mounting hole diameter is precisely 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • Their power is maintained, and after approximately ten years it drops only by ~1% (theoretically),
  • They have excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
  • In other words, due to the metallic finish of gold, the element gains a professional look,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • 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...
  • Considering the ability of precise molding and adaptation to individualized solutions, neodymium magnets can be modeled in a variety of geometric configurations, which expands the range of possible applications,
  • Significant place in modern technologies – they are commonly used in computer drives, electric motors, precision medical tools, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complex shapes - recommended is cover - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products are able to 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

Lifting parameters

Maximum lifting capacity of the magnet – what it depends on?

Breakaway force was determined for the most favorable conditions, assuming:
  • with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ground touching surface
  • with direct contact (without paint)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

In real-world applications, the actual holding force depends on many variables, presented from most significant:
  • Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate lowers the holding force.

Warnings
Finger safety

Big blocks can smash fingers instantly. Do not put your hand between two attracting surfaces.

Handling guide

Use magnets consciously. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their force.

Magnetic media

Data protection: Neodymium magnets can damage data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Swallowing risk

Always store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.

Heat warning

Control the heat. Heating the magnet to high heat will destroy its magnetic structure and strength.

Precision electronics

Note: rare earth magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.

Metal Allergy

Studies show that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent touching magnets with bare hands and opt for coated magnets.

Material brittleness

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Combustion hazard

Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Implant safety

Patients with a heart stimulator have to maintain an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.

Warning! Want to know more? Read our article: Why are neodymium magnets dangerous?