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MP 20x8/4x5 / 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 030333

GTIN/EAN: 5906301812272

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.31 g

Magnetization Direction

↑ axial

Load capacity

6.65 kg / 65.21 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

technical parameters »

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Technical parameters of the product - MP 20x8/4x5 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030333
GTIN/EAN	5906301812272
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	8/4 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	11.31 g
Magnetization Direction	↑ axial
Load capacity ~ ?	6.65 kg / 65.21 N
Magnetic Induction ~ ?	277.16 mT / 2772 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x5 / 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 modeling of the magnet - data

Presented information constitute the result of a engineering calculation. Results rely on algorithms for the material Nd₂Fe₁₄B. Operational performance might slightly differ. Use these calculations as a reference point when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MP 20x8/4x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2424 Gs 242.4 mT	6.65 kg / 6650.0 g 65.2 N	strong
1 mm	2265 Gs 226.5 mT	5.81 kg / 5807.9 g 57.0 N	strong
2 mm	2070 Gs 207.0 mT	4.85 kg / 4851.0 g 47.6 N	strong
3 mm	1858 Gs 185.8 mT	3.91 kg / 3906.5 g 38.3 N	strong
5 mm	1437 Gs 143.7 mT	2.34 kg / 2338.7 g 22.9 N	strong
10 mm	691 Gs 69.1 mT	0.54 kg / 540.5 g 5.3 N	weak grip
15 mm	343 Gs 34.3 mT	0.13 kg / 133.3 g 1.3 N	weak grip
20 mm	186 Gs 18.6 mT	0.04 kg / 39.3 g 0.4 N	weak grip
30 mm	70 Gs 7.0 mT	0.01 kg / 5.5 g 0.1 N	weak grip
50 mm	18 Gs 1.8 mT	0.00 kg / 0.4 g 0.0 N	weak grip

Pulling power weakens significantly with every subsequent millimeter of gap. Remember that even a very thin break (e.g., dirt, varnish, rust) significantly diminishes the holding power. Magnetic products work strongest at the point of direct contact; distance nullifies the power. Analyze how flashily the load capacity fall, when the product does not adhere directly to the steel surface. When designing the arrangement, avoid unnecessary gaps.

Table 2: Vertical hold (vertical surface)
MP 20x8/4x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.33 kg / 1330.0 g 13.0 N
1 mm	Stal (~0.2)	1.16 kg / 1162.0 g 11.4 N
2 mm	Stal (~0.2)	0.97 kg / 970.0 g 9.5 N
3 mm	Stal (~0.2)	0.78 kg / 782.0 g 7.7 N
5 mm	Stal (~0.2)	0.47 kg / 468.0 g 4.6 N
10 mm	Stal (~0.2)	0.11 kg / 108.0 g 1.1 N
15 mm	Stal (~0.2)	0.03 kg / 26.0 g 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 8.0 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 table below presents the theoretical force needed to initiate the downward movement of the magnet down on a vertical steel plate (assuming typical friction). This value is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MP 20x8/4x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.00 kg / 1995.0 g 19.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.33 kg / 1330.0 g 13.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.67 kg / 665.0 g 6.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.33 kg / 3325.0 g 32.6 N

When mounting a magnet on a upright surface (e.g., a car body), it you can count on only about 1/5 of its maximum pull force. Gravitational force and a low friction coefficient mean that magnets slide down faster than they detach. Planning a hanger? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the holder will give way down under a noticeably lighter load. Utilizing a rubberized coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MP 20x8/4x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.67 kg / 665.0 g 6.5 N
1 mm	25%	1.66 kg / 1662.5 g 16.3 N
2 mm	50%	3.33 kg / 3325.0 g 32.6 N
5 mm	100%	6.65 kg / 6650.0 g 65.2 N
10 mm	100%	6.65 kg / 6650.0 g 65.2 N

A too thin steel is not enough to absorb the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the product works worse. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal resistance (material behavior) - thermal limit
MP 20x8/4x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	6.65 kg / 6650.0 g 65.2 N	OK
40 °C	-2.2%	6.50 kg / 6503.7 g 63.8 N	OK
60 °C	-4.4%	6.36 kg / 6357.4 g 62.4 N
80 °C	-6.6%	6.21 kg / 6211.1 g 60.9 N
100 °C	-28.8%	4.73 kg / 4734.8 g 46.4 N

Standard neodymium magnets irreversibly lose power above the temperature limit. Watch out for overheating – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's capacity briefly lowers. Avoid using this product near heat sources exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetism.

*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 20x8/4x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	9.28 kg / 9284 g 91.1 N 4 012 Gs	N/A
1 mm	8.73 kg / 8732 g 85.7 N 4 701 Gs	7.86 kg / 7859 g 77.1 N ~0 Gs
2 mm	8.11 kg / 8108 g 79.5 N 4 530 Gs	7.30 kg / 7297 g 71.6 N ~0 Gs
3 mm	7.45 kg / 7448 g 73.1 N 4 342 Gs	6.70 kg / 6703 g 65.8 N ~0 Gs
5 mm	6.10 kg / 6102 g 59.9 N 3 930 Gs	5.49 kg / 5492 g 53.9 N ~0 Gs
10 mm	3.27 kg / 3265 g 32.0 N 2 875 Gs	2.94 kg / 2939 g 28.8 N ~0 Gs
20 mm	0.75 kg / 755 g 7.4 N 1 382 Gs	0.68 kg / 679 g 6.7 N ~0 Gs
50 mm	0.02 kg / 19 g 0.2 N 220 Gs	0.02 kg / 17 g 0.2 N ~0 Gs

Two magnets interact from a much further distance than a magnet and steel combination. Such a system of magnet-to-magnet produces a massive flux and a larger range of action. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the pinch force is massive. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).

Table 7: Protective zones (implants) - precautionary measures
MP 20x8/4x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	8.0 cm
Hearing aid	10 Gs (1.0 mT)	6.5 cm
Mechanical watch	20 Gs (2.0 mT)	5.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	4.0 cm
Car key	50 Gs (5.0 mT)	3.5 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Powerful magnet radiation is a large risk to IT equipment and pacemakers. These magnets generate a field that disrupts operation of digital equipment. Notice: the unseen radiation acts through matter and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MP 20x8/4x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	25.67 km/h (7.13 m/s)	0.29 J
30 mm	42.38 km/h (11.77 m/s)	0.78 J
50 mm	54.68 km/h (15.19 m/s)	1.30 J
100 mm	77.33 km/h (21.48 m/s)	2.61 J

Neodymium magnets are very brittle – a collision with steel causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (durability)
MP 20x8/4x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (P_c)
MP 20x8/4x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	7 218 Mx	72.2 µWb
P_c Coefficient	0.31	Low (Flat)

Flux value emitted by the pole surface. Key data in coil applications and motors. P_c value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38

Environment	Effective steel pull	Effect
Air (land)	6.65 kg	Standard
Water (riverbed)	7.61 kg (+0.96 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just a fraction of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Temperature resistance

*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) = 0.31

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 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

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%

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: 030333-2025

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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. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.

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. 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.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. Damage to the protective layer during assembly is the most common cause of rusting. 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.

This model is characterized by dimensions Ø20x5 mm and a weight of 11.31 g. The key parameter here is the lifting capacity amounting to approximately 6.65 kg (force ~65.21 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 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.

Pros and cons of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:

They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
They do not lose their magnetic properties even under external field action,
A magnet with a metallic gold surface is more attractive,
The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
Thanks to the option of precise forming and adaptation to individualized solutions, magnetic components can be modeled in a broad palette of shapes and sizes, which increases their versatility,
Significant place in innovative solutions – they find application in data components, electromotive mechanisms, medical devices, as well as modern systems.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

Weaknesses

Problematic aspects of neodymium magnets and proposals for their use:

To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
Neodymium magnets decrease their power 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
When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
Limited ability of creating nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
With budget limitations the cost of neodymium magnets is economically unviable,

Pull force analysis

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

The lifting capacity listed is a theoretical maximum value conducted under standard conditions:

using a plate made of mild steel, acting as a circuit closing element
possessing a massiveness of min. 10 mm to avoid saturation
characterized by smoothness
without the slightest insulating layer between the magnet and steel
under axial force direction (90-degree angle)
in neutral thermal conditions

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower subject to the following factors, in order of importance:

Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
Angle of force application – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with NdFeB magnets

Finger safety

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

Life threat

For implant holders: Powerful magnets disrupt medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Do not overheat magnets

Avoid heat. Neodymium magnets are susceptible to heat. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Shattering risk

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Product not for children

Absolutely keep magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are tragic.

Magnetic media

Powerful magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Allergic reactions

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness appears, immediately stop working with magnets and use protective gear.

Phone sensors

Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, tablet, and GPS.

Handling guide

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

Dust explosion hazard

Dust created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Warning! More info about hazards in the article: Safety of working with magnets.

MP 20x8/4x5 / N38 - ring magnet

Technical parameters of the product - MP 20x8/4x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the magnet - data

Table 1: Static force (pull vs gap) - characteristics MP 20x8/4x5 / N38

Table 2: Vertical hold (vertical surface) MP 20x8/4x5 / N38

Table 3: Wall mounting (shearing) - vertical pull MP 20x8/4x5 / N38

Table 4: Material efficiency (substrate influence) - power losses MP 20x8/4x5 / N38

Table 5: Thermal resistance (material behavior) - thermal limit MP 20x8/4x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MP 20x8/4x5 / N38

Table 7: Protective zones (implants) - precautionary measures MP 20x8/4x5 / N38

Table 8: Impact energy (cracking risk) - warning MP 20x8/4x5 / N38

Table 9: Coating parameters (durability) MP 20x8/4x5 / N38

Table 10: Electrical data (Pc) MP 20x8/4x5 / N38

Table 11: Underwater work (magnet fishing) MP 20x8/4x5 / N38

1. Sliding resistance

2. Efficiency vs thickness

3. Temperature resistance

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

Material specification

Sustainability

Pulling force

Magnetic Induction

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Pros and cons of neodymium magnets.

Strengths

Weaknesses

Pull force analysis

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

Lifting capacity in real conditions – factors

Safety rules for work with NdFeB magnets

Finger safety

Life threat

Do not overheat magnets

Shattering risk

Product not for children

Magnetic media

Allergic reactions

Phone sensors

Handling guide

Dust explosion hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs gap) - characteristics
MP 20x8/4x5 / N38

Table 2: Vertical hold (vertical surface)
MP 20x8/4x5 / N38

Table 3: Wall mounting (shearing) - vertical pull
MP 20x8/4x5 / N38

Table 4: Material efficiency (substrate influence) - power losses
MP 20x8/4x5 / N38

Table 5: Thermal resistance (material behavior) - thermal limit
MP 20x8/4x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 20x8/4x5 / N38

Table 7: Protective zones (implants) - precautionary measures
MP 20x8/4x5 / N38

Table 8: Impact energy (cracking risk) - warning
MP 20x8/4x5 / N38

Table 9: Coating parameters (durability)
MP 20x8/4x5 / N38

Table 10: Electrical data (P_c)
MP 20x8/4x5 / N38

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38