Product available Ships today (order by 14:00)

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: PLN 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

view specifications »

7.75 ZŁ with VAT / pcs + price for transport

6.30 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

6.30 ZŁ

7.75 ZŁ

price from 100 pcs

5.92 ZŁ

7.28 ZŁ

price from 400 pcs

5.54 ZŁ

6.82 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Need help making a decision?

Give us a call +48 888 99 98 98 if you prefer contact us using request form the contact section.
Strength as well as structure of a neodymium magnet can be calculated using our magnetic mass calculator.

Same-day processing for orders placed before 14:00.

Technical details - 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

Technical analysis of the assembly - technical parameters

Presented information are the direct effect of a mathematical simulation. Values rely on models for the class Nd₂Fe₁₄B. Real-world parameters may deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static force (force vs distance) - power drop
MP 20x8/4x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	2424 Gs 242.4 mT	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N	medium risk
1 mm	2265 Gs 226.5 mT	5.81 kg / 12.80 lbs 5807.9 g / 57.0 N	medium risk
2 mm	2070 Gs 207.0 mT	4.85 kg / 10.69 lbs 4851.0 g / 47.6 N	medium risk
3 mm	1858 Gs 185.8 mT	3.91 kg / 8.61 lbs 3906.5 g / 38.3 N	medium risk
5 mm	1437 Gs 143.7 mT	2.34 kg / 5.16 lbs 2338.7 g / 22.9 N	medium risk
10 mm	691 Gs 69.1 mT	0.54 kg / 1.19 lbs 540.5 g / 5.3 N	low risk
15 mm	343 Gs 34.3 mT	0.13 kg / 0.29 lbs 133.3 g / 1.3 N	low risk
20 mm	186 Gs 18.6 mT	0.04 kg / 0.09 lbs 39.3 g / 0.4 N	low risk
30 mm	70 Gs 7.0 mT	0.01 kg / 0.01 lbs 5.5 g / 0.1 N	low risk
50 mm	18 Gs 1.8 mT	0.00 kg / 0.00 lbs 0.4 g / 0.0 N	low risk

Grip strength decreases significantly with every mm of gap. Note that even the smallest gap (e.g., dirt, varnish, rust) significantly weakens the grip. Magnets work optimally in perfect adhesion; air break nullifies the force. Analyze how flashily the parameters plummet, when the product does not adhere tightly to the steel surface. When planning the mounting, avoid unnecessary gaps.

Table 2: Sliding load (vertical surface)
MP 20x8/4x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.33 kg / 2.93 lbs 1330.0 g / 13.0 N
1 mm	Stal (~0.2)	1.16 kg / 2.56 lbs 1162.0 g / 11.4 N
2 mm	Stal (~0.2)	0.97 kg / 2.14 lbs 970.0 g / 9.5 N
3 mm	Stal (~0.2)	0.78 kg / 1.72 lbs 782.0 g / 7.7 N
5 mm	Stal (~0.2)	0.47 kg / 1.03 lbs 468.0 g / 4.6 N
10 mm	Stal (~0.2)	0.11 kg / 0.24 lbs 108.0 g / 1.1 N
15 mm	Stal (~0.2)	0.03 kg / 0.06 lbs 26.0 g / 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 0.02 lbs 8.0 g / 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 2.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 g / 0.0 N

The table below defines the estimated force necessary to initiate the sliding of the magnet downwards on a vertical steel plate (considering typical friction coefficient). This value is a function of the air gap 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/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.00 kg / 4.40 lbs 1995.0 g / 19.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.33 kg / 2.93 lbs 1330.0 g / 13.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.67 kg / 1.47 lbs 665.0 g / 6.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.33 kg / 7.33 lbs 3325.0 g / 32.6 N

When mounting a element on a upright surface (e.g., a car body), it will maintain just about 20%-30% of its nominal power. Gravitational force as well as a low friction coefficient cause that magnets slide down faster than they pop off the substrate. Designing a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slide down under a significantly smaller cargo. Using a rubber coating can effectively improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MP 20x8/4x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.67 kg / 1.47 lbs 665.0 g / 6.5 N
1 mm	25%	1.66 kg / 3.67 lbs 1662.5 g / 16.3 N
2 mm	50%	3.33 kg / 7.33 lbs 3325.0 g / 32.6 N
3 mm	75%	4.99 kg / 11.00 lbs 4987.5 g / 48.9 N
5 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N
10 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N
11 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N
12 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N

A thin sheet cannot take in the full magnetic flux, which wastes potential of the magnet. If you install a neodymium to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you require a sufficiently solid backing of metal. The material oversaturation means that on thin elements (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel cross-section based on the following data.

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

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N	OK
40 °C	-2.2%	6.50 kg / 14.34 lbs 6503.7 g / 63.8 N	OK
60 °C	-4.4%	6.36 kg / 14.02 lbs 6357.4 g / 62.4 N
80 °C	-6.6%	6.21 kg / 13.69 lbs 6211.1 g / 60.9 N
100 °C	-28.8%	4.73 kg / 10.44 lbs 4734.8 g / 46.4 N

Ordinary NdFeB products change their properties strength above the temperature limit. Watch out for overheating – heat can irreversibly destroy this product. As the temperature rises, the neodymium's force temporarily lowers. Do not use this product close to ovens higher than its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetic properties.

*Technical advisory: Thermal stability depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table indicates permanent field degradation for this specific geometry.

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

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	9.28 kg / 20.47 lbs 4 012 Gs	1.39 kg / 3.07 lbs 1393 g / 13.7 N	N/A
1 mm	8.73 kg / 19.25 lbs 4 701 Gs	1.31 kg / 2.89 lbs 1310 g / 12.8 N	7.86 kg / 17.33 lbs ~0 Gs
2 mm	8.11 kg / 17.88 lbs 4 530 Gs	1.22 kg / 2.68 lbs 1216 g / 11.9 N	7.30 kg / 16.09 lbs ~0 Gs
3 mm	7.45 kg / 16.42 lbs 4 342 Gs	1.12 kg / 2.46 lbs 1117 g / 11.0 N	6.70 kg / 14.78 lbs ~0 Gs
5 mm	6.10 kg / 13.45 lbs 3 930 Gs	0.92 kg / 2.02 lbs 915 g / 9.0 N	5.49 kg / 12.11 lbs ~0 Gs
10 mm	3.27 kg / 7.20 lbs 2 875 Gs	0.49 kg / 1.08 lbs 490 g / 4.8 N	2.94 kg / 6.48 lbs ~0 Gs
20 mm	0.75 kg / 1.66 lbs 1 382 Gs	0.11 kg / 0.25 lbs 113 g / 1.1 N	0.68 kg / 1.50 lbs ~0 Gs
50 mm	0.02 kg / 0.04 lbs 220 Gs	0.00 kg / 0.01 lbs 3 g / 0.0 N	0.02 kg / 0.04 lbs ~0 Gs
60 mm	0.01 kg / 0.02 lbs 139 Gs	0.00 kg / 0.00 lbs 1 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
70 mm	0.00 kg / 0.01 lbs 93 Gs	0.00 kg / 0.00 lbs 1 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
80 mm	0.00 kg / 0.00 lbs 65 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
90 mm	0.00 kg / 0.00 lbs 47 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
100 mm	0.00 kg / 0.00 lbs 35 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs

Two magnetic products interact from a much further distance than a neodymium and metal combination. The connection of two magnets produces a massive flux and a further horizon of performance. Designing a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the pinch force is huge. The levitation is marginally weaker than the attraction, but still significant.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
* Results show friction force of dual matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
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
Timepiece	20 Gs (2.0 mT)	5.0 cm
Mobile device	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 poses a serious hazard to electronic devices and medical implants. These NdFeB products produce a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - 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

Magnetic elements are very brittle – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can destroy the magnet or injury to fingers. Always hold the magnet during installation 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 playing with large magnets.

Table 9: Anti-corrosion coating 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
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 passing through the pole surface. Key data in coil applications as well as sensors. The P_c coefficient determines the magnet's operating point.

Table 11: Submerged application
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%

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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Note: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Thermal stability

*For N38 material, 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.

Technical and environmental data

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: 030333-2026

Magnet Unit Converter

Magnet pull force

Kilograms (kg)

Pounds (lbs)

Field Strength

Tesla (T)

Input your value in a single slot to see the conversion for all other fields right away.

See more offers

Product available Ships today (order by 14:00)

MW 15x1 / N38 - cylindrical magnet

0.800 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 12x50 / N38 - cylindrical magnet

28.29 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 5x2 / N38 - cylindrical magnet

0.1845 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 10x6 / N38 - cylindrical magnet

1.045 ZŁ brutto / pcs

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. This product with a force of 6.65 kg works great as a door latch, speaker holder, or spacer element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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 can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor 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 8/4 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. Aesthetic mounting requires selecting the appropriate head size.

The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 6.65 kg, which translates to 65.21 N in newtons. The mounting hole diameter is precisely 8/4 mm.

These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of rare earth magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:

They do not lose magnetism, even over approximately 10 years – the decrease in power is only ~1% (based on measurements),
They are noted for resistance to demagnetization induced by external disturbances,
In other words, due to the metallic finish of gold, the element becomes visually attractive,
Neodymium magnets ensure maximum magnetic induction on a small area, which ensures high operational effectiveness,
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...
Possibility of precise forming and adapting to defined needs,
Huge importance in innovative solutions – they are used in magnetic memories, electric drive systems, precision medical tools, and multitasking production systems.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium magnets:

At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complex shapes.
Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

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

Information about lifting capacity was determined for ideal contact conditions, assuming:

using a base made of low-carbon steel, functioning as a magnetic yoke
possessing a thickness of minimum 10 mm to ensure full flux closure
with an ground touching surface
under conditions of ideal adhesion (surface-to-surface)
under axial force vector (90-degree angle)
at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual holding force is determined by several key aspects, ranked from the most important:

Air gap (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
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. High carbon content worsen the interaction with the magnet.
Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the holding force.

Precautions when working with NdFeB magnets

Allergic reactions

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or opt for versions in plastic housing.

Keep away from children

These products are not toys. Swallowing several magnets may result in them attracting across intestines, which constitutes a direct threat to life and requires immediate surgery.

Mechanical processing

Dust created during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Do not underestimate power

Handle with care. Rare earth magnets act from a long distance and snap with massive power, often faster than you can react.

Safe distance

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Beware of splinters

Despite metallic appearance, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Danger to pacemakers

For implant holders: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Physical harm

Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

GPS and phone interference

Be aware: neodymium magnets produce a field that interferes with sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Demagnetization risk

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Attention! Looking for details? Read our article: Why are neodymium magnets dangerous?

MP 20x8/4x5 / N38 - ring magnet

Technical details - MP 20x8/4x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the assembly - technical parameters

Table 1: Static force (force vs distance) - power drop MP 20x8/4x5 / N38

Table 2: Sliding load (vertical surface) MP 20x8/4x5 / N38

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

Table 4: Material efficiency (saturation) - sheet metal selection MP 20x8/4x5 / N38

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

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

Table 7: Hazards (implants) - warnings MP 20x8/4x5 / N38

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

Table 9: Anti-corrosion coating durability MP 20x8/4x5 / N38

Table 10: Construction data (Flux) MP 20x8/4x5 / N38

Table 11: Submerged application MP 20x8/4x5 / N38

1. Shear force

2. Efficiency vs thickness

3. Thermal stability

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

Chemical composition

Environmental data

Magnet pull force

Field Strength

See more offers

MW 15x1 / N38 - cylindrical magnet

MW 12x50 / N38 - cylindrical magnet

MW 5x2 / N38 - cylindrical magnet

MW 10x6 / N38 - cylindrical magnet

Pros and cons of rare earth magnets.

Strengths

Disadvantages

Lifting parameters

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

Impact of factors on magnetic holding capacity in practice

Precautions when working with NdFeB magnets

Allergic reactions

Keep away from children

Mechanical processing

Do not underestimate power

Safe distance

Beware of splinters

Danger to pacemakers

Physical harm

GPS and phone interference

Demagnetization risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - power drop
MP 20x8/4x5 / N38

Table 2: Sliding load (vertical surface)
MP 20x8/4x5 / N38

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

Table 4: Material efficiency (saturation) - sheet metal selection
MP 20x8/4x5 / N38

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

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

Table 7: Hazards (implants) - warnings
MP 20x8/4x5 / N38

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

Table 9: Anti-corrosion coating durability
MP 20x8/4x5 / N38

Table 10: Construction data (Flux)
MP 20x8/4x5 / N38

Table 11: Submerged application
MP 20x8/4x5 / N38