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MP 20x8x6 / 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: PLN 1-6500
Rating: 5

ring magnet

Catalog no 030189

GTIN/EAN: 5906301812067

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

11.88 g

Magnetization Direction

↑ axial

Load capacity

7.22 kg / 70.81 N

Magnetic Induction

318.85 mT / 3188 Gs

Coating

[NiCuNi] Nickel

technical details »

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Technical - MP 20x8x6 / N38 - ring magnet

Specification / characteristics - MP 20x8x6 / N38 - ring magnet

properties

properties	values
Cat. no.	030189
GTIN/EAN	5906301812067
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	20 mm [±0,1 mm]
internal diameter Ø	8 mm [±0,1 mm]
Height	6 mm [±0,1 mm]
Weight	11.88 g
Magnetization Direction	↑ axial
Load capacity ~ ?	7.22 kg / 70.81 N
Magnetic Induction ~ ?	318.85 mT / 3188 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8x6 / 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 analysis of the assembly - data

The following information are the direct effect of a mathematical analysis. Values were calculated on models for the class Nd₂Fe₁₄B. Actual performance might slightly differ. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - interaction chart
MP 20x8x6 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5917 Gs 591.7 mT	7.22 kg / 7220.0 g 70.8 N	strong
1 mm	5321 Gs 532.1 mT	5.84 kg / 5839.8 g 57.3 N	strong
2 mm	4736 Gs 473.6 mT	4.63 kg / 4626.6 g 45.4 N	strong
3 mm	4184 Gs 418.4 mT	3.61 kg / 3610.0 g 35.4 N	strong
5 mm	3216 Gs 321.6 mT	2.13 kg / 2132.9 g 20.9 N	strong
10 mm	1650 Gs 165.0 mT	0.56 kg / 561.3 g 5.5 N	safe
15 mm	907 Gs 90.7 mT	0.17 kg / 169.7 g 1.7 N	safe
20 mm	544 Gs 54.4 mT	0.06 kg / 61.1 g 0.6 N	safe
30 mm	240 Gs 24.0 mT	0.01 kg / 11.9 g 0.1 N	safe
50 mm	75 Gs 7.5 mT	0.00 kg / 1.2 g 0.0 N	safe

Pulling power drops sharply per each millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, dust) noticeably reduces the pull force. Magnets work most effectively in perfect adhesion; gap weakens the force. Analyze how flashily the parameters drop, when the magnet does not touch flatly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Sliding load (vertical surface)
MP 20x8x6 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.44 kg / 1444.0 g 14.2 N
1 mm	Stal (~0.2)	1.17 kg / 1168.0 g 11.5 N
2 mm	Stal (~0.2)	0.93 kg / 926.0 g 9.1 N
3 mm	Stal (~0.2)	0.72 kg / 722.0 g 7.1 N
5 mm	Stal (~0.2)	0.43 kg / 426.0 g 4.2 N
10 mm	Stal (~0.2)	0.11 kg / 112.0 g 1.1 N
15 mm	Stal (~0.2)	0.03 kg / 34.0 g 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data presents the approximate holding capacity required to cause the sliding of the magnet vertically against a upright metal surface (considering standard friction coefficient). This parameter varies with the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 20x8x6 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.17 kg / 2166.0 g 21.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.44 kg / 1444.0 g 14.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.72 kg / 722.0 g 7.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.61 kg / 3610.0 g 35.4 N

When mounting a element on a vertical wall (e.g., a car body), it will only hold just about 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that holders move down easier than they pop off the substrate. Designing a hanger? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller weight. Utilizing a rubberized coating can significantly increase the grip.

Table 4: Material efficiency (saturation) - power losses
MP 20x8x6 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.72 kg / 722.0 g 7.1 N
1 mm	25%	1.81 kg / 1805.0 g 17.7 N
2 mm	50%	3.61 kg / 3610.0 g 35.4 N
5 mm	100%	7.22 kg / 7220.0 g 70.8 N
10 mm	100%	7.22 kg / 7220.0 g 70.8 N

A too thin steel is incapable of absorb the entire magnetic field, which wastes potential of the holder. If you mount a strong magnet to a weak sheet, the field will pass right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's power, you need a suitably thick element of steel. The saturation effect means that on thin elements (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MP 20x8x6 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	7.22 kg / 7220.0 g 70.8 N	OK
40 °C	-2.2%	7.06 kg / 7061.2 g 69.3 N	OK
60 °C	-4.4%	6.90 kg / 6902.3 g 67.7 N	OK
80 °C	-6.6%	6.74 kg / 6743.5 g 66.2 N
100 °C	-28.8%	5.14 kg / 5140.6 g 50.4 N

Classic neodymiums irreversibly lose strength past the thermal threshold. Protect against heat – excessive heat can permanently destroy this magnet. With increasing heat, the magnet's capacity momentarily decreases. Avoid using this magnet close to ovens higher than its operating temperature limit. Too high temperature will cause permanent loss of magnetic properties.

*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MP 20x8x6 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	52.44 kg / 52443 g 514.5 N 6 121 Gs	N/A
1 mm	47.33 kg / 47332 g 464.3 N 11 242 Gs	42.60 kg / 42599 g 417.9 N ~0 Gs
2 mm	42.42 kg / 42418 g 416.1 N 10 642 Gs	38.18 kg / 38176 g 374.5 N ~0 Gs
3 mm	37.84 kg / 37837 g 371.2 N 10 051 Gs	34.05 kg / 34053 g 334.1 N ~0 Gs
5 mm	29.73 kg / 29735 g 291.7 N 8 910 Gs	26.76 kg / 26761 g 262.5 N ~0 Gs
10 mm	15.49 kg / 15493 g 152.0 N 6 432 Gs	13.94 kg / 13943 g 136.8 N ~0 Gs
20 mm	4.08 kg / 4077 g 40.0 N 3 299 Gs	3.67 kg / 3669 g 36.0 N ~0 Gs
50 mm	0.18 kg / 185 g 1.8 N 702 Gs	0.17 kg / 166 g 1.6 N ~0 Gs

Two magnets interact from a much further distance than a magnet and sheet combination. Such a system of two magnets generates a stronger field and a larger range of performance. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the pinch force is extreme. The levitation is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Protective zones (implants) - precautionary measures
MP 20x8x6 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	14.5 cm
Hearing aid	10 Gs (1.0 mT)	11.5 cm
Mechanical watch	20 Gs (2.0 mT)	9.0 cm
Mobile device	40 Gs (4.0 mT)	6.5 cm
Remote	50 Gs (5.0 mT)	6.0 cm
Payment card	400 Gs (40.0 mT)	2.5 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

Extremely neodym field poses a real danger to electronics as well as pacemakers. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MP 20x8x6 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	26.04 km/h (7.23 m/s)	0.31 J
30 mm	43.11 km/h (11.97 m/s)	0.85 J
50 mm	55.60 km/h (15.44 m/s)	1.42 J
100 mm	78.62 km/h (21.84 m/s)	2.83 J

Magnetic elements are very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. 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 violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MP 20x8x6 / 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 (P_c)
MP 20x8x6 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	15 688 Mx	156.9 µWb
P_c Coefficient	1.14	High (Stable)

Total magnetic flux passing through the pole surface. Key data in coil applications and motors. The P_c coefficient determines the working geometry.

Table 11: Physics of underwater searching
MP 20x8x6 / N38

Environment	Effective steel pull	Effect
Air (land)	7.22 kg	Standard
Water (riverbed)	8.27 kg (+1.05 kg Buoyancy gain)	+14.5%

Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.14

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%

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: 030189-2025

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The ring magnet with a hole MP 20x8x6 / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 7.22 kg works great as a door latch, speaker holder, or spacer element in devices.

This is a crucial issue when working with model MP 20x8x6 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.

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. Always check that the screw head is not larger than the outer diameter of the magnet (20 mm), so it doesn't protrude beyond the outline.

This model is characterized by dimensions Ø20x6 mm and a weight of 11.88 g. The pulling force of this model is an impressive 7.22 kg, which translates to 70.81 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8 mm.

The poles are located on the planes with holes, not on the sides of the ring. 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). 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

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

They retain magnetic properties for almost 10 years – the drop is just ~1% (according to analyses),
They are extremely resistant to demagnetization induced by presence of other magnetic fields,
By applying a decorative coating of nickel, the element gains an modern look,
Magnets possess huge magnetic induction on the outer side,
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...
Thanks to flexibility in shaping and the capacity to adapt to complex applications,
Wide application in innovative solutions – they are utilized in mass storage devices, electromotive mechanisms, diagnostic systems, as well as technologically advanced constructions.
Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:

They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects 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 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
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
Due to limitations in realizing threads and complicated shapes in magnets, we propose using a housing - magnetic mechanism.
Health risk to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

Breakaway force was defined for optimal configuration, including:

using a sheet made of low-carbon steel, functioning as a magnetic yoke
whose thickness is min. 10 mm
with a plane free of scratches
without the slightest air gap between the magnet and steel
for force applied at a right angle (in the magnet axis)
at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

In real-world applications, the actual lifting capacity depends on many variables, ranked from the most important:

Distance – existence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Material composition – different alloys reacts the same. Alloy additives worsen the attraction effect.
Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

Warnings

Life threat

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Do not drill into magnets

Powder produced during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Adults only

Neodymium magnets are not suitable for play. Eating a few magnets can lead to them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.

Crushing risk

Risk of injury: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

Data carriers

Intense magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Warning for allergy sufferers

It is widely known that nickel (standard magnet coating) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands and select encased magnets.

Beware of splinters

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them breaking into small pieces.

GPS Danger

A powerful magnetic field interferes with the operation of compasses in phones and GPS navigation. Do not bring magnets near a smartphone to prevent breaking the sensors.

Do not underestimate power

Be careful. Rare earth magnets act from a long distance and connect with massive power, often faster than you can move away.

Permanent damage

Avoid heat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?

MP 20x8x6 / N38 - ring magnet

Technical - MP 20x8x6 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the assembly - data

Table 1: Static force (force vs gap) - interaction chart MP 20x8x6 / N38

Table 2: Sliding load (vertical surface) MP 20x8x6 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces MP 20x8x6 / N38

Table 4: Material efficiency (saturation) - power losses MP 20x8x6 / N38

Table 5: Working in heat (stability) - resistance threshold MP 20x8x6 / N38

Table 6: Two magnets (repulsion) - field range MP 20x8x6 / N38

Table 7: Protective zones (implants) - precautionary measures MP 20x8x6 / N38

Table 8: Dynamics (kinetic energy) - collision effects MP 20x8x6 / N38

Table 9: Coating parameters (durability) MP 20x8x6 / N38

Table 10: Electrical data (Pc) MP 20x8x6 / N38

Table 11: Physics of underwater searching MP 20x8x6 / N38

1. Wall mount (shear)

2. Steel saturation

3. Power loss vs temp

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

Chemical composition

Environmental data

Force (pull)

Magnetic Field

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Strengths and weaknesses of neodymium magnets.

Pros

Cons

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

Lifting capacity in real conditions – factors

Warnings

Life threat

Do not drill into magnets

Adults only

Crushing risk

Data carriers

Warning for allergy sufferers

Beware of splinters

GPS Danger

Do not underestimate power

Permanent damage

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - interaction chart
MP 20x8x6 / N38

Table 2: Sliding load (vertical surface)
MP 20x8x6 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 20x8x6 / N38

Table 4: Material efficiency (saturation) - power losses
MP 20x8x6 / N38

Table 5: Working in heat (stability) - resistance threshold
MP 20x8x6 / N38

Table 6: Two magnets (repulsion) - field range
MP 20x8x6 / N38

Table 7: Protective zones (implants) - precautionary measures
MP 20x8x6 / N38

Table 8: Dynamics (kinetic energy) - collision effects
MP 20x8x6 / N38

Table 9: Coating parameters (durability)
MP 20x8x6 / N38

Table 10: Electrical data (P_c)
MP 20x8x6 / N38

Table 11: Physics of underwater searching
MP 20x8x6 / N38