Product available Ships today (order by 14:00)

MP 25x8x5 / N38 - ring magnet

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

ring magnet

Catalog no 030196

GTIN/EAN: 5906301812135

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

16.52 g

Magnetization Direction

↑ axial

Load capacity

7.16 kg / 70.21 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

technical specifications »

5.90 ZŁ with VAT / pcs + price for transport

4.80 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

4.80 ZŁ

5.90 ZŁ

price from 150 pcs

4.51 ZŁ

5.55 ZŁ

price from 550 pcs

4.22 ZŁ

5.20 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Not sure about your choice?

Pick up the phone and ask +48 888 99 98 98 if you prefer let us know via inquiry form through our site.
Parameters as well as form of magnets can be verified on our modular calculator.

Orders submitted before 14:00 will be dispatched today!

Technical - MP 25x8x5 / N38 - ring magnet

Specification / characteristics - MP 25x8x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030196
GTIN/EAN	5906301812135
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	25 mm [±0,1 mm]
internal diameter Ø	8 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	16.52 g
Magnetization Direction	↑ axial
Load capacity ~ ?	7.16 kg / 70.21 N
Magnetic Induction ~ ?	230.20 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x8x5 / 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

Engineering analysis of the magnet - technical parameters

The following information represent the result of a engineering analysis. Results are based on algorithms for the class Nd₂Fe₁₄B. Actual conditions may differ from theoretical values. Please consider these data as a reference point for designers.

Table 1: Static pull force (force vs gap) - power drop
MP 25x8x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	7.16 kg / 15.79 LBS 7160.0 g / 70.2 N	warning
1 mm	5310 Gs 531.0 mT	6.05 kg / 13.33 LBS 6048.6 g / 59.3 N	warning
2 mm	4846 Gs 484.6 mT	5.04 kg / 11.10 LBS 5036.9 g / 49.4 N	warning
3 mm	4397 Gs 439.7 mT	4.15 kg / 9.15 LBS 4148.2 g / 40.7 N	warning
5 mm	3576 Gs 357.6 mT	2.74 kg / 6.05 LBS 2743.2 g / 26.9 N	warning
10 mm	2073 Gs 207.3 mT	0.92 kg / 2.03 LBS 921.6 g / 9.0 N	weak grip
15 mm	1231 Gs 123.1 mT	0.33 kg / 0.72 LBS 325.2 g / 3.2 N	weak grip
20 mm	773 Gs 77.3 mT	0.13 kg / 0.28 LBS 128.0 g / 1.3 N	weak grip
30 mm	356 Gs 35.6 mT	0.03 kg / 0.06 LBS 27.2 g / 0.3 N	weak grip
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 LBS 2.8 g / 0.0 N	weak grip

Grip strength drops sharply with every mm of gap. Note that every additional insulation layer (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Magnets work optimally in perfect adhesion; gap weakens the power. Analyze how rapidly the pull force fall, when the product does not adhere flatly to the metal substrate. When designing the mounting, eliminate redundant distances.

Table 2: Shear capacity (wall)
MP 25x8x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.43 kg / 3.16 LBS 1432.0 g / 14.0 N
1 mm	Stal (~0.2)	1.21 kg / 2.67 LBS 1210.0 g / 11.9 N
2 mm	Stal (~0.2)	1.01 kg / 2.22 LBS 1008.0 g / 9.9 N
3 mm	Stal (~0.2)	0.83 kg / 1.83 LBS 830.0 g / 8.1 N
5 mm	Stal (~0.2)	0.55 kg / 1.21 LBS 548.0 g / 5.4 N
10 mm	Stal (~0.2)	0.18 kg / 0.41 LBS 184.0 g / 1.8 N
15 mm	Stal (~0.2)	0.07 kg / 0.15 LBS 66.0 g / 0.6 N
20 mm	Stal (~0.2)	0.03 kg / 0.06 LBS 26.0 g / 0.3 N
30 mm	Stal (~0.2)	0.01 kg / 0.01 LBS 6.0 g / 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 LBS 0.0 g / 0.0 N

The following data indicates the theoretical holding capacity necessary to cause the shifting of the magnet downwards against a upright metal surface (considering standard friction). The holding force varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 25x8x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.15 kg / 4.74 LBS 2148.0 g / 21.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.43 kg / 3.16 LBS 1432.0 g / 14.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.72 kg / 1.58 LBS 716.0 g / 7.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.58 kg / 7.89 LBS 3580.0 g / 35.1 N

When placing a holder on a upright surface (e.g., a board), it will maintain barely approx. 1/5 of its maximum pull force. Gravitational force and a weak degree of grip cause that magnets slip faster than they detach. Want to create a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a significantly smaller load. Application of an anti-slip coating can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MP 25x8x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.72 kg / 1.58 LBS 716.0 g / 7.0 N
1 mm	25%	1.79 kg / 3.95 LBS 1790.0 g / 17.6 N
2 mm	50%	3.58 kg / 7.89 LBS 3580.0 g / 35.1 N
3 mm	75%	5.37 kg / 11.84 LBS 5370.0 g / 52.7 N
5 mm	100%	7.16 kg / 15.79 LBS 7160.0 g / 70.2 N
10 mm	100%	7.16 kg / 15.79 LBS 7160.0 g / 70.2 N
11 mm	100%	7.16 kg / 15.79 LBS 7160.0 g / 70.2 N
12 mm	100%	7.16 kg / 15.79 LBS 7160.0 g / 70.2 N

A thin metal plate is not enough to focus the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's potential, you need a suitably thick backing of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MP 25x8x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	7.16 kg / 15.79 LBS 7160.0 g / 70.2 N	OK
40 °C	-2.2%	7.00 kg / 15.44 LBS 7002.5 g / 68.7 N	OK
60 °C	-4.4%	6.84 kg / 15.09 LBS 6845.0 g / 67.1 N	OK
80 °C	-6.6%	6.69 kg / 14.74 LBS 6687.4 g / 65.6 N
100 °C	-28.8%	5.10 kg / 11.24 LBS 5097.9 g / 50.0 N

Ordinary NdFeB products change their properties power after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently damage this magnet. With increasing heat, the neodymium's power momentarily lowers. Refrain from using this magnet in hot environments higher than its operating temperature limit. Ignoring the limit will result in destruction of magnetism.

*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 25x8x5 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	82.42 kg / 181.72 LBS 6 082 Gs	12.36 kg / 27.26 LBS 12364 g / 121.3 N	N/A
1 mm	75.95 kg / 167.44 LBS 11 091 Gs	11.39 kg / 25.12 LBS 11392 g / 111.8 N	68.35 kg / 150.69 LBS ~0 Gs
2 mm	69.63 kg / 153.51 LBS 10 620 Gs	10.44 kg / 23.03 LBS 10445 g / 102.5 N	62.67 kg / 138.16 LBS ~0 Gs
3 mm	63.64 kg / 140.29 LBS 10 153 Gs	9.55 kg / 21.04 LBS 9545 g / 93.6 N	57.27 kg / 126.26 LBS ~0 Gs
5 mm	52.69 kg / 116.16 LBS 9 238 Gs	7.90 kg / 17.42 LBS 7903 g / 77.5 N	47.42 kg / 104.54 LBS ~0 Gs
10 mm	31.58 kg / 69.62 LBS 7 152 Gs	4.74 kg / 10.44 LBS 4737 g / 46.5 N	28.42 kg / 62.66 LBS ~0 Gs
20 mm	10.61 kg / 23.39 LBS 4 145 Gs	1.59 kg / 3.51 LBS 1591 g / 15.6 N	9.55 kg / 21.05 LBS ~0 Gs
50 mm	0.65 kg / 1.43 LBS 1 024 Gs	0.10 kg / 0.21 LBS 97 g / 1.0 N	0.58 kg / 1.28 LBS ~0 Gs
60 mm	0.31 kg / 0.69 LBS 712 Gs	0.05 kg / 0.10 LBS 47 g / 0.5 N	0.28 kg / 0.62 LBS ~0 Gs
70 mm	0.16 kg / 0.36 LBS 514 Gs	0.02 kg / 0.05 LBS 24 g / 0.2 N	0.15 kg / 0.32 LBS ~0 Gs
80 mm	0.09 kg / 0.20 LBS 383 Gs	0.01 kg / 0.03 LBS 14 g / 0.1 N	0.08 kg / 0.18 LBS ~0 Gs
90 mm	0.05 kg / 0.12 LBS 293 Gs	0.01 kg / 0.02 LBS 8 g / 0.1 N	0.05 kg / 0.11 LBS ~0 Gs
100 mm	0.03 kg / 0.07 LBS 230 Gs	0.00 kg / 0.01 LBS 5 g / 0.0 N	0.03 kg / 0.06 LBS ~0 Gs

Two strong neodymiums attract each other from a wider radius than a magnet and sheet setup. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Remember that when bringing together two magnets, the collision energy is huge. The levitation is marginally weaker than the connection force, but still large.
*Field value for N-N configuration reaches ~0 Gs at the midpoint of the gap (due to field cancellation).
* Results demonstrate shear force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MP 25x8x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	17.0 cm
Hearing aid	10 Gs (1.0 mT)	13.5 cm
Mechanical watch	20 Gs (2.0 mT)	10.5 cm
Mobile device	40 Gs (4.0 mT)	8.0 cm
Remote	50 Gs (5.0 mT)	7.5 cm
Payment card	400 Gs (40.0 mT)	3.0 cm
HDD hard drive	600 Gs (60.0 mT)	2.5 cm

Extremely neodym field poses a large risk to electronics and medical implants. These neodymiums generate a flux that destroys function of digital equipment. Be aware: the unseen radiation acts through matter and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MP 25x8x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.62 km/h (6.28 m/s)	0.33 J
30 mm	36.45 km/h (10.13 m/s)	0.85 J
50 mm	46.96 km/h (13.04 m/s)	1.41 J
100 mm	66.40 km/h (18.44 m/s)	2.81 J

NdFeB products are prone to chipping – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 25x8x5 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MP 25x8x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	24 536 Mx	245.4 µWb
P_c Coefficient	1.03	High (Stable)

Total magnetic flux passing through the magnet pole. Essential parameter in coil applications as well as sensors. P_c value determines the working geometry.

Table 11: Submerged application
MP 25x8x5 / N38

Environment	Effective steel pull	Effect
Air (land)	7.16 kg	Standard
Water (riverbed)	8.20 kg (+1.04 kg buoyancy gain)	+14.5%

Warning: 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

*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC 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) = 1.03

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.

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%

Ecology and recycling (GPSR)

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 030196-2026

Quick Unit Converter

Force (pull)

lbs

Magnetic Induction

Induction (T)

Input your figure in one of the inputs, and the rest will update in real-time.

MPL 15x2x30 / N38 - lamellar magnet

4.75 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

400.00 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 70x60 / N38 - cylindrical magnet

630.01 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

SMZR 32x250 / N52 - magnetic separator with handle

738.00 ZŁ brutto / pcs

The ring-shaped magnet MP 25x8x5 / 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 7.16 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 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. 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 Ø25x5 mm and a weight of 16.52 g. The key parameter here is the lifting capacity amounting to approximately 7.16 kg (force ~70.21 N). 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Benefits

Besides their exceptional strength, neodymium magnets offer the following advantages:

They retain magnetic properties for nearly 10 years – the drop is just ~1% (based on simulations),
Neodymium magnets are distinguished by extremely resistant to loss of magnetic properties caused by external field sources,
By covering with a smooth layer of silver, the element presents an nice look,
Magnets possess maximum magnetic induction on the outer layer,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Possibility of precise modeling as well as modifying to specific requirements,
Fundamental importance in advanced technology sectors – they are used in magnetic memories, electric motors, medical devices, as well as technologically advanced constructions.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Disadvantages

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
We suggest casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these products can complicate diagnosis medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Detachment force of the magnet in optimal conditions – what contributes to it?

Information about lifting capacity was determined for ideal contact conditions, taking into account:

using a sheet made of high-permeability steel, serving as a magnetic yoke
whose transverse dimension reaches at least 10 mm
with an ideally smooth contact surface
with total lack of distance (no paint)
during detachment in a direction vertical to the plane
at temperature room level

Key elements affecting lifting force

During everyday use, the real power results from many variables, presented from crucial:

Gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
Plate thickness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
Chemical composition of the base – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
Thermal environment – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets

Keep away from electronics

Note: neodymium magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your mobile, device, and GPS.

Nickel allergy

It is widely known that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands or choose encased magnets.

Magnet fragility

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Clashing of two magnets leads to them shattering into small pieces.

Bodily injuries

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

Health Danger

For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Caution required

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Fire warning

Machining of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Electronic hazard

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Operating temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Adults only

NdFeB magnets are not intended for children. Eating a few magnets may result in them attracting across intestines, which poses a critical condition and necessitates immediate surgery.

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

MP 25x8x5 / N38 - ring magnet

Technical - MP 25x8x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the magnet - technical parameters

Table 1: Static pull force (force vs gap) - power drop MP 25x8x5 / N38

Table 2: Shear capacity (wall) MP 25x8x5 / N38

Table 3: Wall mounting (sliding) - vertical pull MP 25x8x5 / N38

Table 4: Material efficiency (saturation) - sheet metal selection MP 25x8x5 / N38

Table 5: Thermal stability (stability) - thermal limit MP 25x8x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system MP 25x8x5 / N38

Table 7: Hazards (electronics) - precautionary measures MP 25x8x5 / N38

Table 8: Impact energy (cracking risk) - collision effects MP 25x8x5 / N38

Table 9: Anti-corrosion coating durability MP 25x8x5 / N38

Table 10: Construction data (Flux) MP 25x8x5 / N38

Table 11: Submerged application MP 25x8x5 / N38

1. Shear force

2. Steel thickness impact

3. Thermal stability

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

Chemical composition

Ecology and recycling (GPSR)

Force (pull)

Magnetic Induction

See also products

MPL 15x2x30 / N38 - lamellar magnet

UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

MW 70x60 / N38 - cylindrical magnet

SMZR 32x250 / N52 - magnetic separator with handle

Pros as well as cons of Nd2Fe14B magnets.

Benefits

Disadvantages

Pull force analysis

Detachment force of the magnet in optimal conditions – what contributes to it?

Key elements affecting lifting force

Safety rules for work with NdFeB magnets

Keep away from electronics

Nickel allergy

Magnet fragility

Bodily injuries

Health Danger

Caution required

Fire warning

Electronic hazard

Operating temperature

Adults only

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - power drop
MP 25x8x5 / N38

Table 2: Shear capacity (wall)
MP 25x8x5 / N38

Table 3: Wall mounting (sliding) - vertical pull
MP 25x8x5 / N38

Table 4: Material efficiency (saturation) - sheet metal selection
MP 25x8x5 / N38

Table 5: Thermal stability (stability) - thermal limit
MP 25x8x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 25x8x5 / N38

Table 7: Hazards (electronics) - precautionary measures
MP 25x8x5 / N38

Table 8: Impact energy (cracking risk) - collision effects
MP 25x8x5 / N38

Table 9: Anti-corrosion coating durability
MP 25x8x5 / N38

Table 10: Construction data (Flux)
MP 25x8x5 / N38

Table 11: Submerged application
MP 25x8x5 / N38

Pros as well as cons of Nd₂Fe₁₄B magnets.