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MP 25x7x9 / 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 030195

GTIN/EAN: 5906301812128

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

7 mm [±0,1 mm]

Height

9 mm [±0,1 mm]

Weight

30.54 g

Magnetization Direction

↑ axial

Load capacity

14.82 kg / 145.39 N

Magnetic Induction

362.13 mT / 3621 Gs

Coating

[NiCuNi] Nickel

view properties »

12.55 ZŁ with VAT / pcs + price for transport

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Product card - MP 25x7x9 / N38 - ring magnet

Specification / characteristics - MP 25x7x9 / N38 - ring magnet

properties

properties	values
Cat. no.	030195
GTIN/EAN	5906301812128
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	7 mm [±0,1 mm]
Height	9 mm [±0,1 mm]
Weight	30.54 g
Magnetization Direction	↑ axial
Load capacity ~ ?	14.82 kg / 145.39 N
Magnetic Induction ~ ?	362.13 mT / 3621 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x7x9 / 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 modeling of the magnet - technical parameters

Presented values represent the outcome of a physical analysis. Results were calculated on algorithms for the class Nd₂Fe₁₄B. Actual parameters may differ. Please consider these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - power drop
MP 25x7x9 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	14.82 kg / 32.67 lbs 14820.0 g / 145.4 N	critical level
1 mm	5310 Gs 531.0 mT	12.52 kg / 27.60 lbs 12519.6 g / 122.8 N	critical level
2 mm	4846 Gs 484.6 mT	10.43 kg / 22.98 lbs 10425.5 g / 102.3 N	critical level
3 mm	4397 Gs 439.7 mT	8.59 kg / 18.93 lbs 8586.1 g / 84.2 N	medium risk
5 mm	3576 Gs 357.6 mT	5.68 kg / 12.52 lbs 5678.0 g / 55.7 N	medium risk
10 mm	2073 Gs 207.3 mT	1.91 kg / 4.21 lbs 1907.5 g / 18.7 N	low risk
15 mm	1231 Gs 123.1 mT	0.67 kg / 1.48 lbs 673.1 g / 6.6 N	low risk
20 mm	773 Gs 77.3 mT	0.27 kg / 0.58 lbs 265.0 g / 2.6 N	low risk
30 mm	356 Gs 35.6 mT	0.06 kg / 0.12 lbs 56.2 g / 0.6 N	low risk
50 mm	115 Gs 11.5 mT	0.01 kg / 0.01 lbs 5.9 g / 0.1 N	low risk

Grip strength weakens significantly per each millimeter of spacing. Note that even a microscopic distance (e.g., dirt, paint, rust) strongly reduces the pull force. Magnetic products work strongest during direct contact; gap nullifies the force. Analyze how rapidly the load capacity fall, when the magnet does not touch tightly to the metal substrate. When designing the arrangement, discard additional spacers.

Table 2: Sliding load (vertical surface)
MP 25x7x9 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	2.96 kg / 6.53 lbs 2964.0 g / 29.1 N
1 mm	Stal (~0.2)	2.50 kg / 5.52 lbs 2504.0 g / 24.6 N
2 mm	Stal (~0.2)	2.09 kg / 4.60 lbs 2086.0 g / 20.5 N
3 mm	Stal (~0.2)	1.72 kg / 3.79 lbs 1718.0 g / 16.9 N
5 mm	Stal (~0.2)	1.14 kg / 2.50 lbs 1136.0 g / 11.1 N
10 mm	Stal (~0.2)	0.38 kg / 0.84 lbs 382.0 g / 3.7 N
15 mm	Stal (~0.2)	0.13 kg / 0.30 lbs 134.0 g / 1.3 N
20 mm	Stal (~0.2)	0.05 kg / 0.12 lbs 54.0 g / 0.5 N
30 mm	Stal (~0.2)	0.01 kg / 0.03 lbs 12.0 g / 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 2.0 g / 0.0 N

The table below defines the approximate shear load necessary to initiate the sliding of the magnet downwards against a vertical steel plate (considering standard friction). This parameter is relative to the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MP 25x7x9 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	4.45 kg / 9.80 lbs 4446.0 g / 43.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	2.96 kg / 6.53 lbs 2964.0 g / 29.1 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.48 kg / 3.27 lbs 1482.0 g / 14.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	7.41 kg / 16.34 lbs 7410.0 g / 72.7 N

When placing a element on a upright wall (e.g., a board), it you can count on just approx. 1/5 of nominal attraction strength. Gravity and a weak degree of grip influence the fact that holders slip faster than they pull off. Planning a wall mount? Note that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller cargo. Application of an anti-slip coating can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MP 25x7x9 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	5%	0.74 kg / 1.63 lbs 741.0 g / 7.3 N
1 mm	13%	1.85 kg / 4.08 lbs 1852.5 g / 18.2 N
2 mm	25%	3.71 kg / 8.17 lbs 3705.0 g / 36.3 N
3 mm	38%	5.56 kg / 12.25 lbs 5557.5 g / 54.5 N
5 mm	63%	9.26 kg / 20.42 lbs 9262.5 g / 90.9 N
10 mm	100%	14.82 kg / 32.67 lbs 14820.0 g / 145.4 N
11 mm	100%	14.82 kg / 32.67 lbs 14820.0 g / 145.4 N
12 mm	100%	14.82 kg / 32.67 lbs 14820.0 g / 145.4 N

A too thin steel is incapable of absorb the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a thin surface, the field will pass right through and the attraction force will be weaker. To squeeze the maximum of this magnet's potential, you require a sufficiently solid element of metal. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel cross-section from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
MP 25x7x9 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	14.82 kg / 32.67 lbs 14820.0 g / 145.4 N	OK
40 °C	-2.2%	14.49 kg / 31.95 lbs 14494.0 g / 142.2 N	OK
60 °C	-4.4%	14.17 kg / 31.23 lbs 14167.9 g / 139.0 N	OK
80 °C	-6.6%	13.84 kg / 30.52 lbs 13841.9 g / 135.8 N
100 °C	-28.8%	10.55 kg / 23.26 lbs 10551.8 g / 103.5 N

Standard neodymium magnets lose strength past the thermal threshold. Protect against heat – heat can permanently demagnetize this product. With increasing heat, the neodymium's power temporarily drops. Refrain from using this magnet in hot environments exceeding its safe range. Too high temperature will lead to destruction of magnetism.

*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 25x7x9 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Strength (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	74.73 kg / 164.76 lbs 6 082 Gs	11.21 kg / 24.71 lbs 11210 g / 110.0 N	N/A
1 mm	68.86 kg / 151.81 lbs 11 091 Gs	10.33 kg / 22.77 lbs 10329 g / 101.3 N	61.97 kg / 136.63 lbs ~0 Gs
2 mm	63.13 kg / 139.18 lbs 10 620 Gs	9.47 kg / 20.88 lbs 9470 g / 92.9 N	56.82 kg / 125.26 lbs ~0 Gs
3 mm	57.70 kg / 127.20 lbs 10 153 Gs	8.65 kg / 19.08 lbs 8654 g / 84.9 N	51.93 kg / 114.48 lbs ~0 Gs
5 mm	47.77 kg / 105.31 lbs 9 238 Gs	7.17 kg / 15.80 lbs 7165 g / 70.3 N	42.99 kg / 94.78 lbs ~0 Gs
10 mm	28.63 kg / 63.12 lbs 7 152 Gs	4.29 kg / 9.47 lbs 4295 g / 42.1 N	25.77 kg / 56.81 lbs ~0 Gs
20 mm	9.62 kg / 21.21 lbs 4 145 Gs	1.44 kg / 3.18 lbs 1443 g / 14.2 N	8.66 kg / 19.09 lbs ~0 Gs
50 mm	0.59 kg / 1.29 lbs 1 024 Gs	0.09 kg / 0.19 lbs 88 g / 0.9 N	0.53 kg / 1.16 lbs ~0 Gs
60 mm	0.28 kg / 0.62 lbs 712 Gs	0.04 kg / 0.09 lbs 43 g / 0.4 N	0.26 kg / 0.56 lbs ~0 Gs
70 mm	0.15 kg / 0.33 lbs 514 Gs	0.02 kg / 0.05 lbs 22 g / 0.2 N	0.13 kg / 0.29 lbs ~0 Gs
80 mm	0.08 kg / 0.18 lbs 383 Gs	0.01 kg / 0.03 lbs 12 g / 0.1 N	0.07 kg / 0.16 lbs ~0 Gs
90 mm	0.05 kg / 0.11 lbs 293 Gs	0.01 kg / 0.02 lbs 7 g / 0.1 N	0.04 kg / 0.10 lbs ~0 Gs
100 mm	0.03 kg / 0.07 lbs 230 Gs	0.00 kg / 0.01 lbs 4 g / 0.0 N	0.03 kg / 0.06 lbs ~0 Gs

Two strong neodymiums interact from a wider radius than a magnet and steel combination. Such a system of two magnets creates a more powerful interaction and a wider radius of operation. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the collision energy is huge. The levitation is marginally weaker than the attraction, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
* Calculations show sliding force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 25x7x9 / 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

A strong magnetic field poses a real danger to electronics as well as pacemakers. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MP 25x7x9 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	23.94 km/h (6.65 m/s)	0.68 J
30 mm	38.57 km/h (10.71 m/s)	1.75 J
50 mm	49.69 km/h (13.80 m/s)	2.91 J
100 mm	70.25 km/h (19.52 m/s)	5.82 J

Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Surface protection spec
MP 25x7x9 / N38

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

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MP 25x7x9 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	22 495 Mx	225.0 µWb
P_c Coefficient	1.05	High (Stable)

Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. P_c value determines the working geometry.

Table 11: Physics of underwater searching
MP 25x7x9 / N38

Environment	Effective steel pull	Effect
Air (land)	14.82 kg	Standard
Water (riverbed)	16.97 kg (+2.15 kg buoyancy gain)	+14.5%

Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Caution: On a vertical wall, the magnet retains merely ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly 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) = 1.05

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%

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: 030195-2026

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Newtons (N)

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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.

This is a crucial issue when working with model MP 25x7x9 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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. 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 7 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.

It is a magnetic ring with a diameter of 25 mm and thickness 9 mm. The key parameter here is the lifting capacity amounting to approximately 14.82 kg (force ~145.39 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 7 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.

Advantages as well as disadvantages of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:

They do not lose magnetism, even after nearly 10 years – the decrease in strength is only ~1% (based on measurements),
They show high resistance to demagnetization induced by external magnetic fields,
In other words, due to the glossy finish of silver, the element looks attractive,
The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
In view of the possibility of accurate molding and customization to individualized needs, magnetic components can be manufactured in a broad palette of shapes and sizes, which amplifies use scope,
Versatile presence in future technologies – they serve a role in data components, electric motors, diagnostic systems, and industrial machines.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:

To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and 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
Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
Due to limitations in creating threads and complicated forms in magnets, we propose using cover - magnetic holder.
Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

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

with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
possessing a massiveness of min. 10 mm to avoid saturation
with an ideally smooth touching surface
with zero gap (without paint)
under vertical force vector (90-degree angle)
at conditions approx. 20°C

Practical lifting capacity: influencing factors

Bear in mind that the working load may be lower subject to elements below, starting with the most relevant:

Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of maximum force).
Steel thickness – too thin sheet does not close the flux, causing part of the flux to be escaped into the air.
Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets

Mechanical processing

Dust produced during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

This is not a toy

Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.

Skin irritation risks

Studies show that nickel (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact or select encased magnets.

Physical harm

Danger of trauma: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Keep away from computers

Do not bring magnets near a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Shattering risk

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Medical interference

Individuals with a heart stimulator have to keep an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

Safe operation

Use magnets with awareness. Their huge power can surprise even professionals. Be vigilant and respect their force.

Maximum temperature

Watch the temperature. Exposing the magnet to high heat will destroy its properties and pulling force.

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

MP 25x7x9 / N38 - ring magnet

Product card - MP 25x7x9 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the magnet - technical parameters

Table 1: Static pull force (force vs distance) - power drop MP 25x7x9 / N38

Table 2: Sliding load (vertical surface) MP 25x7x9 / N38

Table 3: Wall mounting (shearing) - vertical pull MP 25x7x9 / N38

Table 4: Steel thickness (substrate influence) - power losses MP 25x7x9 / N38

Table 5: Working in heat (material behavior) - thermal limit MP 25x7x9 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MP 25x7x9 / N38

Table 7: Safety (HSE) (implants) - precautionary measures MP 25x7x9 / N38

Table 8: Dynamics (cracking risk) - collision effects MP 25x7x9 / N38

Table 9: Surface protection spec MP 25x7x9 / N38

Table 10: Electrical data (Flux) MP 25x7x9 / N38

Table 11: Physics of underwater searching MP 25x7x9 / N38

1. Vertical hold

2. Efficiency vs thickness

3. Power loss vs temp

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

Chemical composition

Environmental data

Magnet pull force

Magnetic Induction

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Advantages as well as disadvantages of rare earth magnets.

Advantages

Weaknesses

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

Practical lifting capacity: influencing factors

Safety rules for work with NdFeB magnets

Mechanical processing

Magnetic interference

This is not a toy

Skin irritation risks

Physical harm

Keep away from computers

Shattering risk

Medical interference

Safe operation

Maximum temperature

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs distance) - power drop
MP 25x7x9 / N38

Table 2: Sliding load (vertical surface)
MP 25x7x9 / N38

Table 3: Wall mounting (shearing) - vertical pull
MP 25x7x9 / N38

Table 4: Steel thickness (substrate influence) - power losses
MP 25x7x9 / N38

Table 5: Working in heat (material behavior) - thermal limit
MP 25x7x9 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 25x7x9 / N38

Table 7: Safety (HSE) (implants) - precautionary measures
MP 25x7x9 / N38

Table 8: Dynamics (cracking risk) - collision effects
MP 25x7x9 / N38

Table 9: Surface protection spec
MP 25x7x9 / N38

Table 10: Electrical data (Flux)
MP 25x7x9 / N38

Table 11: Physics of underwater searching
MP 25x7x9 / N38