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MP 8x6/3.5x3 / N38 - ring magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

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

technical parameters »

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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

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 simulation of the magnet - technical parameters

These information represent the outcome of a engineering calculation. Results are based on algorithms for the class Nd₂Fe₁₄B. Actual performance might slightly deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MP 8x6/3.5x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3327 Gs 332.7 mT	1.37 kg / 1370.0 g 13.4 N	low risk
1 mm	2612 Gs 261.2 mT	0.84 kg / 844.4 g 8.3 N	low risk
2 mm	1884 Gs 188.4 mT	0.44 kg / 439.3 g 4.3 N	low risk
3 mm	1310 Gs 131.0 mT	0.21 kg / 212.4 g 2.1 N	low risk
5 mm	637 Gs 63.7 mT	0.05 kg / 50.3 g 0.5 N	low risk
10 mm	151 Gs 15.1 mT	0.00 kg / 2.8 g 0.0 N	low risk
15 mm	54 Gs 5.4 mT	0.00 kg / 0.4 g 0.0 N	low risk
20 mm	25 Gs 2.5 mT	0.00 kg / 0.1 g 0.0 N	low risk
30 mm	8 Gs 0.8 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	2 Gs 0.2 mT	0.00 kg / 0.0 g 0.0 N	low risk

Pulling power weakens sharply per each millimeter of gap. Note that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably reduces the pull force. Magnetic products operate most effectively at the point of direct contact; gap weakens the power. See how rapidly the parameters fall, when the product does not touch flatly to the steel surface. When designing the assembly, discard redundant distances.

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

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.27 kg / 274.0 g 2.7 N
1 mm	Stal (~0.2)	0.17 kg / 168.0 g 1.6 N
2 mm	Stal (~0.2)	0.09 kg / 88.0 g 0.9 N
3 mm	Stal (~0.2)	0.04 kg / 42.0 g 0.4 N
5 mm	Stal (~0.2)	0.01 kg / 10.0 g 0.1 N
10 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below shows the theoretical weight limit required to initiate the shifting of the magnet vertically against a vertical steel plate (considering standard friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 8x6/3.5x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.41 kg / 411.0 g 4.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.27 kg / 274.0 g 2.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.14 kg / 137.0 g 1.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.69 kg / 685.0 g 6.7 N

When mounting a holder on a vertical surface (e.g., a car body), it you can count on barely about 1/5 of nominal attraction strength. Gravity and a low friction coefficient cause that products slip faster than they detach. Want to create a wall mount? Note that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a much lighter cargo. Application of an anti-slip coating can drastically raise the stability.

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

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.14 kg / 137.0 g 1.3 N
1 mm	25%	0.34 kg / 342.5 g 3.4 N
2 mm	50%	0.69 kg / 685.0 g 6.7 N
5 mm	100%	1.37 kg / 1370.0 g 13.4 N
10 mm	100%	1.37 kg / 1370.0 g 13.4 N

A thin sheet cannot conduct the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you need a suitably thick piece of steel. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet works worse. We advise picking the steel dimension from these parameters.

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

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.37 kg / 1370.0 g 13.4 N	OK
40 °C	-2.2%	1.34 kg / 1339.9 g 13.1 N	OK
60 °C	-4.4%	1.31 kg / 1309.7 g 12.8 N
80 °C	-6.6%	1.28 kg / 1279.6 g 12.6 N
100 °C	-28.8%	0.98 kg / 975.4 g 9.6 N

Ordinary NdFeB products lose strength past the thermal threshold. Avoid high temperatures – heat can irreversibly demagnetize this product. With every degree above norm, the neodymium's force briefly drops. Refrain from using this product close to ovens higher than its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetic properties.

*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MP 8x6/3.5x3 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2.36 kg / 2357 g 23.1 N 4 867 Gs	N/A
1 mm	1.90 kg / 1905 g 18.7 N 5 981 Gs	1.71 kg / 1714 g 16.8 N ~0 Gs
2 mm	1.45 kg / 1453 g 14.3 N 5 223 Gs	1.31 kg / 1308 g 12.8 N ~0 Gs
3 mm	1.06 kg / 1063 g 10.4 N 4 468 Gs	0.96 kg / 957 g 9.4 N ~0 Gs
5 mm	0.53 kg / 528 g 5.2 N 3 148 Gs	0.47 kg / 475 g 4.7 N ~0 Gs
10 mm	0.09 kg / 86 g 0.8 N 1 274 Gs	0.08 kg / 78 g 0.8 N ~0 Gs
20 mm	0.00 kg / 5 g 0.0 N 301 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 27 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums interact from a much further distance than a neodymium and metal setup. The connection of two magnets generates a stronger field and a larger range of performance. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the collision energy is huge. The repulsion force is slightly lower than the connection force, but still impressive.
*Flux density between like poles is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

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
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 serious hazard to IT equipment as well as pacemakers. These NdFeB products produce a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

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

Start from (mm)	Speed (km/h)	Energy (J)
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 violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or painful pinches to fingers. 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 eye protection 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. 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
P_c Coefficient	0.46	Low (Flat)

Total magnetic flux passing through the magnet pole. Essential parameter in coil applications as well as sensors. The P_c coefficient 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%

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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Shear force

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

2. Plate thickness effect

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

3. Thermal stability

*For N38 grade, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (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 P_c (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 P_c 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%

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: 030206-2025

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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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. 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 can be damaged 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. 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 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.

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.

Strengths and weaknesses of neodymium magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:

They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
They feature excellent resistance to magnetic field loss as a result of opposing magnetic fields,
A magnet with a metallic nickel surface looks better,
They feature high magnetic induction at the operating surface, which increases their power,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to versatility in forming and the ability to adapt to specific needs,
Huge importance in modern technologies – they are used in data components, electric motors, diagnostic systems, also industrial machines.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:

To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
When exposed to high temperature, neodymium magnets suffer a drop in power. 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 recommend 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 complex shapes in magnets, we propose using a housing - magnetic mechanism.
Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power is the result of a measurement for the most favorable conditions, including:

with the application of a sheet made of special test steel, ensuring full magnetic saturation
possessing a massiveness of min. 10 mm to avoid saturation
with a surface perfectly flat
without any clearance between the magnet and steel
under perpendicular force direction (90-degree angle)
at room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by specific conditions, such as (from most important):

Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
Metal type – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

H&S for magnets

Warning for allergy sufferers

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select coated magnets.

Implant safety

People with a pacemaker should maintain an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.

Protect data

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Dust explosion hazard

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Bone fractures

Large magnets can crush fingers instantly. Never place your hand between two strong magnets.

Do not overheat magnets

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Caution required

Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

No play value

Only for adults. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.

Eye protection

NdFeB magnets are sintered ceramics, which means they are very brittle. Impact of two magnets will cause them cracking into small pieces.

Phone sensors

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

Danger! Learn more about hazards in the article: Safety of working with magnets.

MP 8x6/3.5x3 / N38 - ring magnet

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

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the magnet - technical parameters

Table 1: Static pull force (pull vs gap) - characteristics MP 8x6/3.5x3 / N38

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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces MP 8x6/3.5x3 / N38

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

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

Table 6: Two magnets (attraction) - field collision MP 8x6/3.5x3 / N38

Table 7: Protective zones (implants) - precautionary measures MP 8x6/3.5x3 / N38

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

Table 9: Coating parameters (durability) MP 8x6/3.5x3 / N38

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

Table 11: Submerged application MP 8x6/3.5x3 / N38

1. Shear force

2. Plate thickness effect

3. Thermal stability

4. Demagnetization curve and operating point (B-H)

Chemical composition

Sustainability

Magnet pull force

Magnetic Induction

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Strengths and weaknesses of neodymium magnets.

Pros

Weaknesses

Pull force analysis

Maximum lifting force for a neodymium magnet – what it depends on?

Impact of factors on magnetic holding capacity in practice

H&S for magnets

Warning for allergy sufferers

Implant safety

Protect data

Dust explosion hazard

Bone fractures

Do not overheat magnets

Caution required

No play value

Eye protection

Phone sensors

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - characteristics
MP 8x6/3.5x3 / N38

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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 8x6/3.5x3 / N38

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

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

Table 6: Two magnets (attraction) - field collision
MP 8x6/3.5x3 / N38

Table 7: Protective zones (implants) - precautionary measures
MP 8x6/3.5x3 / N38

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

Table 9: Coating parameters (durability)
MP 8x6/3.5x3 / N38

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

Table 11: Submerged application
MP 8x6/3.5x3 / N38