Product available Ships tomorrow

MP 25x5x5 / 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

ring magnet

Catalog no 030193

GTIN/EAN: 5906301812104

5.00

Load capacity 7.66 kg / 75.12 N Magnetic Induction 230.20 mT / 2302 Gs

Diameter: 25 mm [±0,1 mm]
internal diameter Ø: 5 mm [±0,1 mm]
Height: 5 mm [±0,1 mm]
Weight: 17.67 g
Magnetization Direction: ↑ axial
Coating: [NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see parameters »

4.88 zł net / pcs

6.00 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?

Quantity

Net

Gross

price from 1 pcs

4.88 zł

6.00 zł

price from 150 pcs

4.59 zł

5.64 zł

price from 550 pcs

4.29 zł

5.28 zł

Frequently asked questions

What is the hole in a ring magnet for?

For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.

What is the polarisation?

Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.

What sizes are available?

Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

Technical - MP 25x5x5 / N38 - ring magnet

Specification / characteristics - MP 25x5x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030193
GTIN/EAN	5906301812104
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	5 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	17.67 g
Magnetization Direction	↑ axial
Load capacity ~ ?	7.66 kg / 75.12 N
Magnetic Induction ~ ?	230.20 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x5x5 / 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	310	°C
Curie Temperature TF	590	°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 product - data

These information constitute the outcome of a mathematical simulation. Results were calculated on models for the class Nd₂Fe₁₄B. Operational performance may differ. Treat these data as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - interaction chart
MP 25x5x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N	warning
1 mm	5310 Gs 531.0 mT	6.47 kg / 14.27 LBS 6471.0 g / 63.5 N	warning
2 mm	4846 Gs 484.6 mT	5.39 kg / 11.88 LBS 5388.6 g / 52.9 N	warning
3 mm	4397 Gs 439.7 mT	4.44 kg / 9.78 LBS 4437.9 g / 43.5 N	warning
5 mm	3576 Gs 357.6 mT	2.93 kg / 6.47 LBS 2934.8 g / 28.8 N	warning
10 mm	2073 Gs 207.3 mT	0.99 kg / 2.17 LBS 985.9 g / 9.7 N	low risk
15 mm	1231 Gs 123.1 mT	0.35 kg / 0.77 LBS 347.9 g / 3.4 N	low risk
20 mm	773 Gs 77.3 mT	0.14 kg / 0.30 LBS 137.0 g / 1.3 N	low risk
30 mm	356 Gs 35.6 mT	0.03 kg / 0.06 LBS 29.0 g / 0.3 N	low risk
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 LBS 3.0 g / 0.0 N	low risk

Grip strength drops significantly with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., dirt, varnish, rust) noticeably weakens the grip. Magnets operate optimally during direct contact; gap kills the power. Notice how rapidly the parameters fall, when the product does not adhere flatly to the steel surface. When designing the mounting, discard unnecessary gaps.

Table 2: Vertical capacity (vertical surface)
MP 25x5x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.53 kg / 3.38 LBS 1532.0 g / 15.0 N
1 mm	Stal (~0.2)	1.29 kg / 2.85 LBS 1294.0 g / 12.7 N
2 mm	Stal (~0.2)	1.08 kg / 2.38 LBS 1078.0 g / 10.6 N
3 mm	Stal (~0.2)	0.89 kg / 1.96 LBS 888.0 g / 8.7 N
5 mm	Stal (~0.2)	0.59 kg / 1.29 LBS 586.0 g / 5.7 N
10 mm	Stal (~0.2)	0.20 kg / 0.44 LBS 198.0 g / 1.9 N
15 mm	Stal (~0.2)	0.07 kg / 0.15 LBS 70.0 g / 0.7 N
20 mm	Stal (~0.2)	0.03 kg / 0.06 LBS 28.0 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 presents the estimated holding capacity needed to cause the shifting of the magnet vertically on a upright steel plate (assuming standard friction coefficient). This value is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 25x5x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.30 kg / 5.07 LBS 2298.0 g / 22.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.53 kg / 3.38 LBS 1532.0 g / 15.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.77 kg / 1.69 LBS 766.0 g / 7.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.83 kg / 8.44 LBS 3830.0 g / 37.6 N

When hanging a magnet on a upright surface (e.g., a board), it will only hold only approx. 1/5 of its nominal power. Gravitational force and a low friction coefficient influence the fact that magnets slip easier than they pop off the substrate. Designing a hanger? Consider that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the holder will give way down under a noticeably lighter cargo. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - power losses
MP 25x5x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.77 kg / 1.69 LBS 766.0 g / 7.5 N
1 mm	25%	1.92 kg / 4.22 LBS 1915.0 g / 18.8 N
2 mm	50%	3.83 kg / 8.44 LBS 3830.0 g / 37.6 N
3 mm	75%	5.75 kg / 12.67 LBS 5745.0 g / 56.4 N
5 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N
10 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N
11 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N
12 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N

A too thin steel cannot absorb the entire magnetic field, which wastes potential of the holder. Should you attach a powerful product to a thin surface, the field will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's power, you require a sufficiently solid piece of metal. The saturation effect means that on thin elements (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - thermal limit
MP 25x5x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N	OK
40 °C	-2.2%	7.49 kg / 16.52 LBS 7491.5 g / 73.5 N	OK
60 °C	-4.4%	7.32 kg / 16.14 LBS 7323.0 g / 71.8 N	OK
80 °C	-6.6%	7.15 kg / 15.77 LBS 7154.4 g / 70.2 N
100 °C	-28.8%	5.45 kg / 12.02 LBS 5453.9 g / 53.5 N

Ordinary NdFeB products lose strength above the temperature limit. Watch out for overheating – heat can permanently destroy this product. With every degree above norm, the neodymium's capacity briefly drops. Refrain from using this product near heat sources higher than its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetism.

*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 25x5x5 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Sliding 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 interact from a significantly greater distance than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a wider radius of operation. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the impact force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Attention: Estimates apply to shear force of two same magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 25x5x5 / 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
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

Extremely neodym field poses a large risk to electronic devices as well as medical implants. These neodymiums produce a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MP 25x5x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.16 km/h (6.15 m/s)	0.33 J
30 mm	23.68 km/h (6.58 m/s)	0.38 J
50 mm	23.74 km/h (6.59 m/s)	0.38 J
100 mm	23.75 km/h (6.60 m/s)	0.38 J

Neodymium magnets are prone to chipping – a collision with steel can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Corrosion resistance
MP 25x5x5 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MP 25x5x5 / 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 magnet pole. Key data when building generators and motors. P_c value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 25x5x5 / N38

Environment	Effective steel pull	Effect
Air (land)	7.66 kg	Standard
Water (riverbed)	8.77 kg (+1.11 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. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Note: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Plate thickness effect

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

3. Temperature resistance

*For N38 material, 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.

Technical and environmental data

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%

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: 030193-2026

Magnet Unit Converter

Force (pull)

Force (N)

Pounds (lbs)

Field Strength

Tesla (T)

Input a number in one of the inputs, and the rest will convert automatically.

Other products

Product available Ships tomorrow

MW 38x12 / N38 - cylindrical magnet

32.10 zł brutto / pcs

Product available Ships tomorrow

ZM XMAG2 105 elementów - magnetic toy

49.20 zł brutto / pcs

Product available Ships tomorrow

SM 32x250 [2xM8] / N42 - magnetic separator

873.30 zł brutto / pcs

Product available Ships tomorrow

MP 20x8/4x5 / N38 - ring magnet

7.75 zł brutto / pcs

The ring magnet with a hole MP 25x5x5 / 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 7.66 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. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. 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. 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 5 mm fits this model. 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.

The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 7.66 kg, which translates to 75.12 N in newtons. The mounting hole diameter is precisely 5 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They retain magnetic properties for almost 10 years – the drop is just ~1% (according to analyses),
Magnets perfectly defend themselves against loss of magnetization caused by foreign field sources,
A magnet with a shiny gold surface is more attractive,
They feature high magnetic induction at the operating surface, which increases their power,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
Thanks to the potential of free shaping and customization to specialized requirements, NdFeB magnets can be created in a variety of geometric configurations, which expands the range of possible applications,
Key role in modern industrial fields – they serve a role in magnetic memories, motor assemblies, advanced medical instruments, and modern systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:

They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
We recommend cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical after entering the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what it depends on?

The specified lifting capacity concerns the peak performance, recorded under optimal environment, namely:

using a sheet made of low-carbon steel, serving as a ideal flux conductor
whose thickness equals approx. 10 mm
with a surface perfectly flat
with zero gap (no paint)
for force acting at a right angle (in the magnet axis)
in temp. approx. 20°C

Lifting capacity in real conditions – factors

Effective lifting capacity is affected by specific conditions, such as (from most important):

Clearance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
Plate material – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate reduces the holding force.

Safety rules for work with neodymium magnets

Mechanical processing

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Serious injuries

Pinching hazard: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Medical implants

Warning for patients: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Keep away from electronics

GPS units and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Permanent damage

Avoid heat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Handling guide

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

Safe distance

Avoid bringing magnets close to a wallet, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Protective goggles

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Keep away from children

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Store away from children and animals.

Warning for allergy sufferers

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, cease handling magnets and wear gloves.

Caution! Want to know more? Read our article: Why are neodymium magnets dangerous?

MP 25x5x5 / N38 - ring magnet

Technical - MP 25x5x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the product - data

Table 1: Static force (force vs gap) - interaction chart MP 25x5x5 / N38

Table 2: Vertical capacity (vertical surface) MP 25x5x5 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MP 25x5x5 / N38

Table 4: Steel thickness (saturation) - power losses MP 25x5x5 / N38

Table 5: Thermal stability (stability) - thermal limit MP 25x5x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system MP 25x5x5 / N38

Table 7: Safety (HSE) (implants) - precautionary measures MP 25x5x5 / N38

Table 8: Dynamics (cracking risk) - warning MP 25x5x5 / N38

Table 9: Corrosion resistance MP 25x5x5 / N38

Table 10: Construction data (Flux) MP 25x5x5 / N38

Table 11: Hydrostatics and buoyancy MP 25x5x5 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Temperature resistance

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

Elemental analysis

Environmental data

Force (pull)

Field Strength

Other products

MW 38x12 / N38 - cylindrical magnet

ZM XMAG2 105 elementów - magnetic toy

SM 32x250 [2xM8] / N42 - magnetic separator

MP 20x8/4x5 / N38 - ring magnet

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

Cons

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what it depends on?

Lifting capacity in real conditions – factors

Safety rules for work with neodymium magnets

Mechanical processing

Serious injuries

Medical implants

Keep away from electronics

Permanent damage

Handling guide

Safe distance

Protective goggles

Keep away from children

Warning for allergy sufferers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - interaction chart
MP 25x5x5 / N38

Table 2: Vertical capacity (vertical surface)
MP 25x5x5 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 25x5x5 / N38

Table 4: Steel thickness (saturation) - power losses
MP 25x5x5 / N38

Table 5: Thermal stability (stability) - thermal limit
MP 25x5x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 25x5x5 / N38

Table 7: Safety (HSE) (implants) - precautionary measures
MP 25x5x5 / N38

Table 8: Dynamics (cracking risk) - warning
MP 25x5x5 / N38

Table 9: Corrosion resistance
MP 25x5x5 / N38

Table 10: Construction data (Flux)
MP 25x5x5 / N38

Table 11: Hydrostatics and buoyancy
MP 25x5x5 / N38

Advantages and disadvantages of Nd₂Fe₁₄B magnets.