Product available Ships tomorrow

MP 15x7/3.5x3 / 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 030182

GTIN/EAN: 5906301811992

5.00

Diameter

15 mm [±0,1 mm]

internal diameter Ø

7/3.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

3.76 g

Magnetization Direction

↑ axial

Load capacity

2.71 kg / 26.61 N

Magnetic Induction

230.16 mT / 2302 Gs

Coating

[NiCuNi] Nickel

technical details »

1.747 ZŁ with VAT / pcs + price for transport

1.420 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

1.420 ZŁ

1.747 ZŁ

price from 450 pcs

1.335 ZŁ

1.642 ZŁ

price from 1800 pcs

1.250 ZŁ

1.537 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Need help making a decision?

Call us +48 888 99 98 98 if you prefer get in touch through our online form the contact section.
Strength and form of magnets can be calculated on our force calculator.

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

Technical - MP 15x7/3.5x3 / N38 - ring magnet

Specification / characteristics - MP 15x7/3.5x3 / N38 - ring magnet

properties

properties	values
Cat. no.	030182
GTIN/EAN	5906301811992
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	15 mm [±0,1 mm]
internal diameter Ø	7/3.5 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	3.76 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.71 kg / 26.61 N
Magnetic Induction ~ ?	230.16 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 15x7/3.5x3 / N38 - ring magnet

properties	values	units
remenance Br [min. - max.] ?	12.2-12.6	kGs
remenance Br [min. - max.] ?	1220-1260	mT
coercivity bHc ?	10.8-11.5	kOe
coercivity bHc ?	860-915	kA/m
actual internal force iHc	≥ 12	kOe
actual internal force iHc	≥ 955	kA/m
energy density [min. - max.] ?	36-38	BH max MGOe
energy density [min. - max.] ?	287-303	BH max KJ/m
max. temperature ?	≤ 80	°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

properties	values	units
Vickers hardness	≥550	Hv
Density	≥7.4	g/cm³
Curie Temperature TC	312 - 380	°C
Curie Temperature TF	593 - 716	°F
Specific resistance	150	μΩ⋅cm
Bending strength	250	MPa
Compressive strength	1000~1100	MPa
Thermal expansion parallel (∥) to orientation (M)	(3-4) x 10^-6	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10^-6	°C^-1
Young's modulus	1.7 x 10⁴	kg/mm²

Technical simulation of the product - report

The following information are the direct effect of a physical calculation. Results are based on models for the material Nd₂Fe₁₄B. Real-world performance may differ from theoretical values. Treat these data as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - power drop
MP 15x7/3.5x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	1995 Gs 199.5 mT	2.71 kg / 5.97 pounds 2710.0 g / 26.6 N	strong
1 mm	1833 Gs 183.3 mT	2.29 kg / 5.05 pounds 2289.1 g / 22.5 N	strong
2 mm	1618 Gs 161.8 mT	1.78 kg / 3.93 pounds 1784.1 g / 17.5 N	low risk
3 mm	1385 Gs 138.5 mT	1.31 kg / 2.88 pounds 1307.5 g / 12.8 N	low risk
5 mm	959 Gs 95.9 mT	0.63 kg / 1.38 pounds 627.1 g / 6.2 N	low risk
10 mm	362 Gs 36.2 mT	0.09 kg / 0.20 pounds 89.3 g / 0.9 N	low risk
15 mm	156 Gs 15.6 mT	0.02 kg / 0.04 pounds 16.5 g / 0.2 N	low risk
20 mm	78 Gs 7.8 mT	0.00 kg / 0.01 pounds 4.1 g / 0.0 N	low risk
30 mm	27 Gs 2.7 mT	0.00 kg / 0.00 pounds 0.5 g / 0.0 N	low risk
50 mm	6 Gs 0.6 mT	0.00 kg / 0.00 pounds 0.0 g / 0.0 N	low risk

Pulling power decreases drastically with every mm of gap. Keep in mind that even the smallest gap (e.g., contamination, varnish, veneer) strongly reduces the pull force. Magnets operate optimally during direct contact; gap drastically cuts the power. Analyze how flashily the pull force drop, when the product does not touch directly to the metal substrate. When planning the mounting, eliminate redundant distances.

Table 2: Vertical capacity (wall)
MP 15x7/3.5x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.54 kg / 1.19 pounds 542.0 g / 5.3 N
1 mm	Stal (~0.2)	0.46 kg / 1.01 pounds 458.0 g / 4.5 N
2 mm	Stal (~0.2)	0.36 kg / 0.78 pounds 356.0 g / 3.5 N
3 mm	Stal (~0.2)	0.26 kg / 0.58 pounds 262.0 g / 2.6 N
5 mm	Stal (~0.2)	0.13 kg / 0.28 pounds 126.0 g / 1.2 N
10 mm	Stal (~0.2)	0.02 kg / 0.04 pounds 18.0 g / 0.2 N
15 mm	Stal (~0.2)	0.00 kg / 0.01 pounds 4.0 g / 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N

This section shows the theoretical weight limit required to cause the shifting of the magnet down along a vertical steel plate (considering typical friction coefficient). This value depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 15x7/3.5x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.81 kg / 1.79 pounds 813.0 g / 8.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.54 kg / 1.19 pounds 542.0 g / 5.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.27 kg / 0.60 pounds 271.0 g / 2.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.36 kg / 2.99 pounds 1355.0 g / 13.3 N

When placing a element on a vertical surface (e.g., a fridge), it will only hold barely approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip mean that magnets slip easier than they pop off the substrate. Want to create a wall mount? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a noticeably lighter load. Application of an anti-slip layer can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MP 15x7/3.5x3 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.27 kg / 0.60 pounds 271.0 g / 2.7 N
1 mm	25%	0.68 kg / 1.49 pounds 677.5 g / 6.6 N
2 mm	50%	1.36 kg / 2.99 pounds 1355.0 g / 13.3 N
3 mm	75%	2.03 kg / 4.48 pounds 2032.5 g / 19.9 N
5 mm	100%	2.71 kg / 5.97 pounds 2710.0 g / 26.6 N
10 mm	100%	2.71 kg / 5.97 pounds 2710.0 g / 26.6 N
11 mm	100%	2.71 kg / 5.97 pounds 2710.0 g / 26.6 N
12 mm	100%	2.71 kg / 5.97 pounds 2710.0 g / 26.6 N

A thin sheet is not enough to focus the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To utilize the maximum of this neodymium's power, you require a sufficiently solid backing of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the holder works worse. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MP 15x7/3.5x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	2.71 kg / 5.97 pounds 2710.0 g / 26.6 N	OK
40 °C	-2.2%	2.65 kg / 5.84 pounds 2650.4 g / 26.0 N	OK
60 °C	-4.4%	2.59 kg / 5.71 pounds 2590.8 g / 25.4 N
80 °C	-6.6%	2.53 kg / 5.58 pounds 2531.1 g / 24.8 N
100 °C	-28.8%	1.93 kg / 4.25 pounds 1929.5 g / 18.9 N

Classic neodymiums change their properties parameters after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly destroy this product. As the temperature rises, the neodymium's force momentarily drops. Avoid using this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will cause destruction of magnetism.

*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MP 15x7/3.5x3 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Sliding Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	3.48 kg / 7.68 pounds 3 483 Gs	0.52 kg / 1.15 pounds 523 g / 5.1 N	N/A
1 mm	3.24 kg / 7.14 pounds 3 846 Gs	0.49 kg / 1.07 pounds 486 g / 4.8 N	2.91 kg / 6.43 pounds ~0 Gs
2 mm	2.94 kg / 6.49 pounds 3 666 Gs	0.44 kg / 0.97 pounds 441 g / 4.3 N	2.65 kg / 5.84 pounds ~0 Gs
3 mm	2.62 kg / 5.78 pounds 3 460 Gs	0.39 kg / 0.87 pounds 393 g / 3.9 N	2.36 kg / 5.20 pounds ~0 Gs
5 mm	1.98 kg / 4.36 pounds 3 004 Gs	0.30 kg / 0.65 pounds 296 g / 2.9 N	1.78 kg / 3.92 pounds ~0 Gs
10 mm	0.81 kg / 1.78 pounds 1 919 Gs	0.12 kg / 0.27 pounds 121 g / 1.2 N	0.73 kg / 1.60 pounds ~0 Gs
20 mm	0.11 kg / 0.25 pounds 724 Gs	0.02 kg / 0.04 pounds 17 g / 0.2 N	0.10 kg / 0.23 pounds ~0 Gs
50 mm	0.00 kg / 0.00 pounds 88 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
60 mm	0.00 kg / 0.00 pounds 54 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
70 mm	0.00 kg / 0.00 pounds 35 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
80 mm	0.00 kg / 0.00 pounds 24 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
90 mm	0.00 kg / 0.00 pounds 17 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
100 mm	0.00 kg / 0.00 pounds 13 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs

Two strong neodymiums interact from a much further distance than a magnet and sheet combination. Such a system of magnet-to-magnet produces a massive flux and a wider radius of operation. Designing a solid fastener? Apply two magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the pinch force is massive. The levitation is slightly lower than the attraction, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
Important: Calculations show shear force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MP 15x7/3.5x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	5.5 cm
Hearing aid	10 Gs (1.0 mT)	4.5 cm
Timepiece	20 Gs (2.0 mT)	3.5 cm
Mobile device	40 Gs (4.0 mT)	3.0 cm
Car key	50 Gs (5.0 mT)	2.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation is a large risk to electronics and medical implants. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MP 15x7/3.5x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	27.63 km/h (7.67 m/s)	0.11 J
30 mm	46.90 km/h (13.03 m/s)	0.32 J
50 mm	60.54 km/h (16.82 m/s)	0.53 J
100 mm	85.62 km/h (23.78 m/s)	1.06 J

Magnetic elements are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Coating parameters (durability)
MP 15x7/3.5x3 / 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 (P_c)
MP 15x7/3.5x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	3 461 Mx	34.6 µWb
P_c Coefficient	0.26	Low (Flat)

Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. P_c value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 15x7/3.5x3 / N38

Environment	Effective steel pull	Effect
Air (land)	2.71 kg	Standard
Water (riverbed)	3.10 kg (+0.39 kg buoyancy gain)	+14.5%

Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Warning: On a vertical wall, the magnet holds just a fraction of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*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) = 0.26

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: 030182-2026

Measurement Calculator

Force (pull)

Force (N)

lbs

Field Strength

Gauss (Gs)

Induction (T)

Simply populate a single box, and the converter fill in everything else for you.

Check out more proposals

Product available Ships tomorrow

MPL 17x17x3 / N38 - lamellar magnet

4.71 ZŁ brutto / pcs

Product available Ships tomorrow

SM 18x275 [2xM5] / N42 - magnetic separator

608.85 ZŁ brutto / pcs

Product available Ships tomorrow

UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

599.99 ZŁ brutto / pcs

Product available Ships tomorrow

MW 8x5 / N38 - cylindrical magnet

0.836 ZŁ brutto / pcs

The ring magnet with a hole MP 15x7/3.5x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. 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 15x7/3.5x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain great sensitivity. 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.

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 7/3.5 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.

This model is characterized by dimensions Ø15x3 mm and a weight of 3.76 g. The key parameter here is the lifting capacity amounting to approximately 2.71 kg (force ~26.61 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 7/3.5 mm.

These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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 and disadvantages of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:

They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
They maintain their magnetic properties even under strong external field,
A magnet with a smooth gold surface looks better,
Neodymium magnets generate maximum magnetic induction on a contact point, which ensures high operational effectiveness,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
Possibility of custom machining and modifying to specific needs,
Wide application in modern industrial fields – they are commonly used in computer drives, drive modules, medical devices, also industrial machines.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:

At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 very 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.
Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mount.
Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Magnet power was defined for optimal configuration, taking into account:

with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
with a thickness minimum 10 mm
characterized by even structure
without the slightest clearance between the magnet and steel
under perpendicular application of breakaway force (90-degree angle)
at temperature room level

Determinants of lifting force in real conditions

During everyday use, the actual lifting capacity is determined by several key aspects, ranked from crucial:

Gap (between the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
Steel thickness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted into the air.
Steel grade – the best choice is high-permeability steel. Stainless steels may attract less.
Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of neodymium magnets

Heat warning

Avoid heat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Impact on smartphones

An intense magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Medical interference

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Cards and drives

Powerful magnetic fields can erase data on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

This is not a toy

Always keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.

Physical harm

Danger of trauma: The pulling power is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Skin irritation risks

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and wear gloves.

Fire risk

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Beware of splinters

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Powerful field

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

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

MP 15x7/3.5x3 / N38 - ring magnet

Technical - MP 15x7/3.5x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the product - report

Table 1: Static force (pull vs distance) - power drop MP 15x7/3.5x3 / N38

Table 2: Vertical capacity (wall) MP 15x7/3.5x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MP 15x7/3.5x3 / N38

Table 4: Material efficiency (substrate influence) - power losses MP 15x7/3.5x3 / N38

Table 5: Thermal stability (material behavior) - power drop MP 15x7/3.5x3 / N38

Table 6: Two magnets (repulsion) - field range MP 15x7/3.5x3 / N38

Table 7: Protective zones (implants) - warnings MP 15x7/3.5x3 / N38

Table 8: Collisions (kinetic energy) - warning MP 15x7/3.5x3 / N38

Table 9: Coating parameters (durability) MP 15x7/3.5x3 / N38

Table 10: Electrical data (Pc) MP 15x7/3.5x3 / N38

Table 11: Underwater work (magnet fishing) MP 15x7/3.5x3 / N38

1. Shear force

2. Steel saturation

3. Temperature resistance

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

Elemental analysis

Ecology and recycling (GPSR)

Force (pull)

Field Strength

Check out more proposals

MPL 17x17x3 / N38 - lamellar magnet

SM 18x275 [2xM5] / N42 - magnetic separator

UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

MW 8x5 / N38 - cylindrical magnet

Advantages and disadvantages of rare earth magnets.

Benefits

Cons

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Determinants of lifting force in real conditions

Safe handling of neodymium magnets

Heat warning

Impact on smartphones

Medical interference

Cards and drives

This is not a toy

Physical harm

Skin irritation risks

Fire risk

Beware of splinters

Powerful field

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs distance) - power drop
MP 15x7/3.5x3 / N38

Table 2: Vertical capacity (wall)
MP 15x7/3.5x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 15x7/3.5x3 / N38

Table 4: Material efficiency (substrate influence) - power losses
MP 15x7/3.5x3 / N38

Table 5: Thermal stability (material behavior) - power drop
MP 15x7/3.5x3 / N38

Table 6: Two magnets (repulsion) - field range
MP 15x7/3.5x3 / N38

Table 7: Protective zones (implants) - warnings
MP 15x7/3.5x3 / N38

Table 8: Collisions (kinetic energy) - warning
MP 15x7/3.5x3 / N38

Table 9: Coating parameters (durability)
MP 15x7/3.5x3 / N38

Table 10: Electrical data (P_c)
MP 15x7/3.5x3 / N38

Table 11: Underwater work (magnet fishing)
MP 15x7/3.5x3 / N38