Product on order Ships in 3-5 days

MP 25x12.5x5 / 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 030342

GTIN/EAN: 5906301812289

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

12.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

13.81 g

Magnetization Direction

↑ axial

Load capacity

5.98 kg / 58.67 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

6.20 ZŁ with VAT / pcs + price for transport

5.04 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

5.04 ZŁ

6.20 ZŁ

price from 150 pcs

4.74 ZŁ

5.83 ZŁ

price from 500 pcs

4.44 ZŁ

5.46 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Want to negotiate?

Call us now +48 22 499 98 98 if you prefer contact us by means of our online form the contact page.
Strength and form of a magnet can be tested with our online calculation tool.

Order by 14:00 and we’ll ship today!

Technical specification - MP 25x12.5x5 / N38 - ring magnet

Specification / characteristics - MP 25x12.5x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030342
GTIN/EAN	5906301812289
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	12.5 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	13.81 g
Magnetization Direction	↑ axial
Load capacity ~ ?	5.98 kg / 58.67 N
Magnetic Induction ~ ?	230.20 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x12.5x5 / 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 product - report

Presented data constitute the direct effect of a engineering calculation. Results were calculated on models for the class Nd₂Fe₁₄B. Operational conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - characteristics
MP 25x12.5x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N	warning
1 mm	5310 Gs 531.0 mT	5.05 kg / 11.14 LBS 5051.8 g / 49.6 N	warning
2 mm	4846 Gs 484.6 mT	4.21 kg / 9.27 LBS 4206.8 g / 41.3 N	warning
3 mm	4397 Gs 439.7 mT	3.46 kg / 7.64 LBS 3464.5 g / 34.0 N	warning
5 mm	3576 Gs 357.6 mT	2.29 kg / 5.05 LBS 2291.1 g / 22.5 N	warning
10 mm	2073 Gs 207.3 mT	0.77 kg / 1.70 LBS 769.7 g / 7.6 N	weak grip
15 mm	1231 Gs 123.1 mT	0.27 kg / 0.60 LBS 271.6 g / 2.7 N	weak grip
20 mm	773 Gs 77.3 mT	0.11 kg / 0.24 LBS 106.9 g / 1.0 N	weak grip
30 mm	356 Gs 35.6 mT	0.02 kg / 0.05 LBS 22.7 g / 0.2 N	weak grip
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 LBS 2.4 g / 0.0 N	weak grip

Pulling power decreases drastically with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, paint, rust) noticeably diminishes the holding power. Magnets hold optimally during direct contact; gap weakens the power. Notice how rapidly the load capacity drop, when the magnet does not touch directly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Slippage force (wall)
MP 25x12.5x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.20 kg / 2.64 LBS 1196.0 g / 11.7 N
1 mm	Stal (~0.2)	1.01 kg / 2.23 LBS 1010.0 g / 9.9 N
2 mm	Stal (~0.2)	0.84 kg / 1.86 LBS 842.0 g / 8.3 N
3 mm	Stal (~0.2)	0.69 kg / 1.53 LBS 692.0 g / 6.8 N
5 mm	Stal (~0.2)	0.46 kg / 1.01 LBS 458.0 g / 4.5 N
10 mm	Stal (~0.2)	0.15 kg / 0.34 LBS 154.0 g / 1.5 N
15 mm	Stal (~0.2)	0.05 kg / 0.12 LBS 54.0 g / 0.5 N
20 mm	Stal (~0.2)	0.02 kg / 0.05 LBS 22.0 g / 0.2 N
30 mm	Stal (~0.2)	0.00 kg / 0.01 LBS 4.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 LBS 0.0 g / 0.0 N

This section indicates the approximate weight limit necessary to start the downward movement of the magnet down along a upright steel plate (considering standard friction). The holding force is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MP 25x12.5x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.79 kg / 3.96 LBS 1794.0 g / 17.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.20 kg / 2.64 LBS 1196.0 g / 11.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.60 kg / 1.32 LBS 598.0 g / 5.9 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.99 kg / 6.59 LBS 2990.0 g / 29.3 N

When mounting a magnet on a vertical wall (e.g., a car body), it will only hold only approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip mean that products move down faster than they pull off. Planning a vertical fastening? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will slip down under a noticeably lighter load. Application of an anti-slip coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 25x12.5x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.60 kg / 1.32 LBS 598.0 g / 5.9 N
1 mm	25%	1.50 kg / 3.30 LBS 1495.0 g / 14.7 N
2 mm	50%	2.99 kg / 6.59 LBS 2990.0 g / 29.3 N
3 mm	75%	4.49 kg / 9.89 LBS 4485.0 g / 44.0 N
5 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N
10 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N
11 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N
12 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N

A thin sheet is not enough to take in the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's power, you require a sufficiently solid piece of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the magnet works worse. We recommend selecting the steel dimension based on the following data.

Table 5: Working in heat (material behavior) - power drop
MP 25x12.5x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N	OK
40 °C	-2.2%	5.85 kg / 12.89 LBS 5848.4 g / 57.4 N	OK
60 °C	-4.4%	5.72 kg / 12.60 LBS 5716.9 g / 56.1 N	OK
80 °C	-6.6%	5.59 kg / 12.31 LBS 5585.3 g / 54.8 N
100 °C	-28.8%	4.26 kg / 9.39 LBS 4257.8 g / 41.8 N

Classic neodymiums change their properties power past the thermal threshold. Protect against heat – excessive heat can permanently damage this product. As the temperature rises, the magnet's power briefly decreases. Do not use this product near heat sources higher than its operating temperature limit. Exceeding the critical threshold will result in destruction of magnetic properties.

*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MP 25x12.5x5 / 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 steel setup. The connection of magnet-to-magnet generates a stronger field and a larger range of operation. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still large.
*Field value for N-N configuration reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Calculations apply to friction force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
MP 25x12.5x5 / 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
Phone / Smartphone	40 Gs (4.0 mT)	8.0 cm
Car key	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

Powerful magnet radiation is a real danger to IT equipment as well as medical implants. These NdFeB products produce a flux that destroys function of digital equipment. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MP 25x12.5x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.61 km/h (6.28 m/s)	0.27 J
30 mm	36.44 km/h (10.12 m/s)	0.71 J
50 mm	46.94 km/h (13.04 m/s)	1.17 J
100 mm	66.37 km/h (18.43 m/s)	2.35 J

Neodymium magnets are very brittle – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or injury to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MP 25x12.5x5 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MP 25x12.5x5 / N38

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

Flux value passing through the pole surface. Key data for generator designers and motors. The P_c coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
MP 25x12.5x5 / N38

Environment	Effective steel pull	Effect
Air (land)	5.98 kg	Standard
Water (riverbed)	6.85 kg (+0.87 kg buoyancy gain)	+14.5%

Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Note: On a vertical wall, the magnet holds merely ~20% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.03

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

Elemental analysis

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: 030342-2026

Magnet Unit Converter

Pulling force

Newtons (N)

lbs

Magnetic Induction

Induction (Gs)

Tesla (T)

Put a figure in a single field to see the conversion for the other fields right away.

Other deals

Product on order Ships in 3-5 days

LM TLN - 15 SQ / N38 - magnetic leviton

450.00 ZŁ brutto / pcs

Product on order Ships in 3-5 days

MPL 60x20x10 / N38 - lamellar magnet

68.27 ZŁ brutto / pcs

Product on order Ships in 3-5 days

NC NeoCube 5 mm kwadraty / N38 - neocube

49.99 ZŁ brutto / pcs

Product on order Ships in 3-5 days

MW 2x10 / N38 - cylindrical magnet

0.1845 ZŁ brutto / pcs

The ring-shaped magnet MP 25x12.5x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.

This is a crucial issue when working with model MP 25x12.5x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer 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 does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.

A screw or bolt with a thread diameter smaller than 12.5 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. Always check that the screw head is not larger than the outer diameter of the magnet (25 mm), so it doesn't protrude beyond the outline.

It is a magnetic ring with a diameter of 25 mm and thickness 5 mm. The key parameter here is the holding force amounting to approximately 5.98 kg (force ~58.67 N). The mounting hole diameter is precisely 12.5 mm.

The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of Nd₂Fe₁₄B magnets.

Strengths

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

They retain magnetic properties for around ten years – the loss is just ~1% (based on simulations),
Magnets very well defend themselves against loss of magnetization caused by foreign field sources,
In other words, due to the metallic surface of gold, the element gains visual value,
Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
Possibility of individual shaping and optimizing to atypical conditions,
Universal use in future technologies – they find application in mass storage devices, electric drive systems, medical equipment, as well as industrial machines.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 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 prevent oxidation as well as corrosion.
Due to limitations in producing threads and complex forms in magnets, we propose using a housing - magnetic mount.
Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what it depends on?

The specified lifting capacity represents the maximum value, recorded under laboratory conditions, specifically:

on a plate made of structural steel, effectively closing the magnetic flux
possessing a massiveness of min. 10 mm to avoid saturation
with a plane cleaned and smooth
with total lack of distance (no impurities)
during pulling in a direction vertical to the plane
in stable room temperature

Magnet lifting force in use – key factors

In practice, the actual lifting capacity depends on a number of factors, listed from crucial:

Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
Material composition – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets

Danger to the youngest

Product intended for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep out of reach of children and animals.

Precision electronics

Navigation devices and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.

Handling guide

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

Cards and drives

Equipment safety: Strong magnets can damage data carriers and delicate electronics (heart implants, hearing aids, timepieces).

Allergy Warning

Medical facts indicate that nickel (the usual finish) is a potent allergen. If you have an allergy, refrain from direct skin contact or opt for coated magnets.

Material brittleness

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Finger safety

Large magnets can smash fingers instantly. Do not place your hand between two strong magnets.

Dust explosion hazard

Powder generated during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Heat sensitivity

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Life threat

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Danger! Need more info? Read our article: Are neodymium magnets dangerous?

MP 25x12.5x5 / N38 - ring magnet

Technical specification - MP 25x12.5x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - report

Table 1: Static force (force vs distance) - characteristics MP 25x12.5x5 / N38

Table 2: Slippage force (wall) MP 25x12.5x5 / N38

Table 3: Vertical assembly (shearing) - vertical pull MP 25x12.5x5 / N38

Table 4: Steel thickness (saturation) - sheet metal selection MP 25x12.5x5 / N38

Table 5: Working in heat (material behavior) - power drop MP 25x12.5x5 / N38

Table 6: Two magnets (repulsion) - field collision MP 25x12.5x5 / N38

Table 7: Hazards (implants) - precautionary measures MP 25x12.5x5 / N38

Table 8: Impact energy (kinetic energy) - warning MP 25x12.5x5 / N38

Table 9: Corrosion resistance MP 25x12.5x5 / N38

Table 10: Electrical data (Flux) MP 25x12.5x5 / N38

Table 11: Physics of underwater searching MP 25x12.5x5 / N38

1. Sliding resistance

2. Steel saturation

3. Power loss vs temp

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

Elemental analysis

Ecology and recycling (GPSR)

Pulling force

Magnetic Induction

Other deals

LM TLN - 15 SQ / N38 - magnetic leviton

MPL 60x20x10 / N38 - lamellar magnet

NC NeoCube 5 mm kwadraty / N38 - neocube

MW 2x10 / N38 - cylindrical magnet

Pros and cons of Nd2Fe14B magnets.

Strengths

Limitations

Lifting parameters

Magnetic strength at its maximum – what it depends on?

Magnet lifting force in use – key factors

H&S for magnets

Danger to the youngest

Precision electronics

Handling guide

Cards and drives

Allergy Warning

Material brittleness

Finger safety

Dust explosion hazard

Heat sensitivity

Life threat

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - characteristics
MP 25x12.5x5 / N38

Table 2: Slippage force (wall)
MP 25x12.5x5 / N38

Table 3: Vertical assembly (shearing) - vertical pull
MP 25x12.5x5 / N38

Table 4: Steel thickness (saturation) - sheet metal selection
MP 25x12.5x5 / N38

Table 5: Working in heat (material behavior) - power drop
MP 25x12.5x5 / N38

Table 6: Two magnets (repulsion) - field collision
MP 25x12.5x5 / N38

Table 7: Hazards (implants) - precautionary measures
MP 25x12.5x5 / N38

Table 8: Impact energy (kinetic energy) - warning
MP 25x12.5x5 / N38

Table 9: Corrosion resistance
MP 25x12.5x5 / N38

Table 10: Electrical data (Flux)
MP 25x12.5x5 / N38

Table 11: Physics of underwater searching
MP 25x12.5x5 / N38

Pros and cons of Nd₂Fe₁₄B magnets.