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MP 5x2.7/1.2x5 C / N38 - ring magnet

ring magnet

Catalog no 030201

GTIN: 5906301812180

5.00

Diameter

5 mm [±0,1 mm]

internal diameter Ø

2.7/1.2 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

0.69 g

Magnetization Direction

↑ axial

Load capacity

0.75 kg / 7.31 N

Magnetic Induction

553.14 mT / 5531 Gs

Coating

[NiCuNi] Nickel

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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MP 5x2.7/1.2x5 C / N38 - ring magnet

Specification / characteristics MP 5x2.7/1.2x5 C / N38 - ring magnet

properties

properties	values
Cat. no.	030201
GTIN	5906301812180
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	5 mm [±0,1 mm]
internal diameter Ø	2.7/1.2 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	0.69 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.75 kg / 7.31 N
Magnetic Induction ~ ?	553.14 mT / 5531 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 5x2.7/1.2x5 C / N38 - ring magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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 106	°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 simulation of the product - technical parameters

The following data are the direct effect of a engineering calculation. Results are based on models for the material NdFeB. Real-world parameters may deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MP 5x2.7/1.2x5 C / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5322 Gs 532.2 mT	0.75 kg / 750.0 g 7.4 N	safe
1 mm	3295 Gs 329.5 mT	0.29 kg / 287.5 g 2.8 N	safe
2 mm	1883 Gs 188.3 mT	0.09 kg / 93.9 g 0.9 N	safe
3 mm	1098 Gs 109.8 mT	0.03 kg / 31.9 g 0.3 N	safe
5 mm	440 Gs 44.0 mT	0.01 kg / 5.1 g 0.1 N	safe
10 mm	92 Gs 9.2 mT	0.00 kg / 0.2 g 0.0 N	safe
15 mm	33 Gs 3.3 mT	0.00 kg / 0.0 g 0.0 N	safe
20 mm	15 Gs 1.5 mT	0.00 kg / 0.0 g 0.0 N	safe
30 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	1 Gs 0.1 mT	0.00 kg / 0.0 g 0.0 N	safe

Magnetic force drops significantly with every mm of spacing. Keep in mind that every additional insulation layer (e.g., contamination, paint, rust) noticeably diminishes the holding power. Magnetic products work optimally at the point of direct contact; air break kills the power. Analyze how flashily the parameters plummet, when the product does not touch flatly to the metal substrate. When calculating the assembly, eliminate redundant distances.

Table 2: Sliding Hold (Wall)
MP 5x2.7/1.2x5 C / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.15 kg / 150.0 g 1.5 N
1 mm	Stal (~0.2)	0.06 kg / 58.0 g 0.6 N
2 mm	Stal (~0.2)	0.02 kg / 18.0 g 0.2 N
3 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
5 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
10 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data defines the estimated weight limit sufficient to initiate the sliding of the magnet vertically along a vertical metal surface (assuming standard friction coefficient). The holding force varies with the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 5x2.7/1.2x5 C / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.22 kg / 225.0 g 2.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.15 kg / 150.0 g 1.5 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.08 kg / 75.0 g 0.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.38 kg / 375.0 g 3.7 N

When hanging a magnet on a upright surface (e.g., a car body), it will maintain barely about 20%-30% of its nominal power. Gravitational force and a low friction coefficient cause that products slip faster than they pull off. Planning a vertical fastening? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller cargo. Application of an anti-slip pad can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 5x2.7/1.2x5 C / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.08 kg / 75.0 g 0.7 N
1 mm	25%	0.19 kg / 187.5 g 1.8 N
2 mm	50%	0.38 kg / 375.0 g 3.7 N
5 mm	100%	0.75 kg / 750.0 g 7.4 N
10 mm	100%	0.75 kg / 750.0 g 7.4 N

A thin sheet is not enough to absorb the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's potential, you need a suitably thick element of steel. The saturation effect means that on thin elements (e.g., appliance housings), the magnet works worse. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - power drop
MP 5x2.7/1.2x5 C / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.75 kg / 750.0 g 7.4 N	OK
40 °C	-2.2%	0.73 kg / 733.5 g 7.2 N	OK
60 °C	-4.4%	0.72 kg / 717.0 g 7.0 N	OK
80 °C	-6.6%	0.70 kg / 700.5 g 6.9 N
100 °C	-28.8%	0.53 kg / 534.0 g 5.2 N

Ordinary NdFeB products irreversibly lose parameters after exceeding the maximum temperature. Avoid high temperatures – heat can irreversibly demagnetize this magnet. With increasing heat, the neodymium's capacity momentarily lowers. Avoid using this product close to ovens higher than its safe range. Too high temperature will cause permanent loss of magnetism.

*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 5x2.7/1.2x5 C / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2.75 kg / 2747 g 26.9 N 5 924 Gs	N/A
1 mm	1.77 kg / 1768 g 17.3 N 8 541 Gs	1.59 kg / 1592 g 15.6 N ~0 Gs
2 mm	1.05 kg / 1053 g 10.3 N 6 590 Gs	0.95 kg / 948 g 9.3 N ~0 Gs
3 mm	0.60 kg / 604 g 5.9 N 4 992 Gs	0.54 kg / 544 g 5.3 N ~0 Gs
5 mm	0.20 kg / 198 g 1.9 N 2 860 Gs	0.18 kg / 178 g 1.8 N ~0 Gs
10 mm	0.02 kg / 19 g 0.2 N 880 Gs	0.02 kg / 17 g 0.2 N ~0 Gs
20 mm	0.00 kg / 1 g 0.0 N 184 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 16 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets attract each other from a much further distance than a magnet and steel setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of action. Designing a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*Flux density for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 5x2.7/1.2x5 C / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	3.0 cm
Hearing aid	10 Gs (1.0 mT)	2.5 cm
Timepiece	20 Gs (2.0 mT)	2.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	1.5 cm
Remote	50 Gs (5.0 mT)	1.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	0.5 cm

Extremely neodym field is a serious hazard to IT equipment as well as medical implants. These NdFeB products generate a field that disrupts operation of digital equipment. Notice: the invisible magnetic field penetrates the body and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MP 5x2.7/1.2x5 C / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	33.26 km/h (9.24 m/s)	0.03 J
30 mm	57.59 km/h (16.00 m/s)	0.09 J
50 mm	74.35 km/h (20.65 m/s)	0.15 J
100 mm	105.14 km/h (29.21 m/s)	0.29 J

NdFeB products are very brittle – a violent impact against metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MP 5x2.7/1.2x5 C / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 5x2.7/1.2x5 C / N38

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	862 Mx	8.6 µWb
Współczynnik Pc	0.83	Wysoki (Stabilny)

Flux value emitted by the pole face. Key data for generator builders and Hall effect devices. Pc Factor defines the magnet operating point.

Table 11: Underwater work (magnet fishing)
MP 5x2.7/1.2x5 C / N38

Environment	Effective steel pull	Effect
Air (land)	0.75 kg	Standard
Water (riverbed)	0.86 kg (+0.11 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!

The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Montaż na Ścianie (Ześlizg)

*Uwaga: Na pionowej ścianie magnes utrzyma tylko ok. 20-30% tego co na suficie.

2. Wpływ Grubości Blachy

*Cienka blacha (np. obudowa PC 0.5mm) drastycznie osłabia magnes.

3. Wytrzymałość Temperaturowa

*Dla materiału N38 granica bezpieczeństwa to 80°C.

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Jak rozdzielać?

Nie próbuj odrywać magnesów siłą!
Zawsze zsuwaj je na bok krawędzi stołu.

STAY

MOVE

Zasady Bezpieczeństwa

Elektronika

Trzymaj z dala od dysków HDD, kart płatniczych i telefonów.

Rozruszniki Serca

Osoby z rozrusznikiem muszą zachować dystans min. 10 cm.

Nie dla dzieci

Ryzyko połknięcia. Połknięcie dwóch magnesów grozi śmiercią.

Kruchy materiał

Magnes to ceramika! Uderzenie o inny magnes spowoduje odpryski.

Do czego użyć tego magnesu?

Sprawdzone zastosowania dla wymiaru 15x10x2 mm

Elektronika i Czujniki

Idealny jako element wyzwalający dla czujników Halla oraz kontaktronów w systemach alarmowych. Płaski kształt (2mm) pozwala na ukrycie go w wąskich szczelinach obudowy.

Modelarstwo i Druk 3D

Stosowany do tworzenia niewidocznych zamknięć w modelach drukowanych 3D. Można go wprasować w wydruk lub wkleić w kieszeń zaprojektowaną w modelu CAD.

Meble i Fronty

Używany jako "domykacz" lekkich drzwiczek szafkowych, gdzie standardowe magnesy meblowe są za grube. Wymaga wklejenia w płytkie podfrezowanie.

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6.81 ZŁ brutto / pcs

The ring magnet with a hole MP 5x2.7/1.2x5 C / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 0.75 kg works great as a door latch, speaker holder, or spacer element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. 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 2.7/1.2 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 (5 mm), so it doesn't protrude beyond the outline.

The presented product is a ring magnet with dimensions Ø5 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 0.75 kg, which translates to 7.31 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 2.7/1.2 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 neodymium magnets.

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

They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
They possess excellent resistance to weakening of magnetic properties as a result of opposing magnetic fields,
The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
Magnets have maximum magnetic induction on the active area,
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...
Thanks to flexibility in forming and the ability to modify to specific needs,
Significant place in future technologies – they are commonly used in computer drives, drive modules, medical equipment, and modern systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
Due to limitations in realizing nuts and complex forms in magnets, we recommend using a housing - magnetic holder.
Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what it depends on?

Magnet power is the result of a measurement for ideal contact conditions, assuming:

with the application of a yoke made of special test steel, guaranteeing maximum field concentration
whose transverse dimension equals approx. 10 mm
with a surface free of scratches
under conditions of gap-free contact (surface-to-surface)
under vertical force vector (90-degree angle)
at standard ambient temperature

What influences lifting capacity in practice

It is worth knowing that the magnet holding may be lower depending on the following factors, in order of importance:

Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets

Shattering risk

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Power loss in heat

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

This is not a toy

Always keep magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are tragic.

Compass and GPS

An intense magnetic field interferes with the functioning of compasses in phones and GPS navigation. Keep magnets close to a device to avoid damaging the sensors.

Bodily injuries

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Dust explosion hazard

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Avoid contact if allergic

A percentage of the population experience a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause dermatitis. We recommend wear protective gloves.

Health Danger

For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Threat to electronics

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Powerful field

Handle with care. Neodymium magnets act from a distance and snap with massive power, often faster than you can move away.

Safety First!

Want to know more? Check our post: Are neodymium magnets dangerous?

MP 5x2.7/1.2x5 C / N38 - ring magnet

MP 5x2.7/1.2x5 C / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the product - technical parameters

1. Montaż na Ścianie (Ześlizg)

2. Wpływ Grubości Blachy

3. Wytrzymałość Temperaturowa

Magnet Pull Force

Magnetic Field

Jak rozdzielać?

Elektronika

Rozruszniki Serca

Nie dla dzieci

Kruchy materiał

Do czego użyć tego magnesu?

Elektronika i Czujniki

Modelarstwo i Druk 3D

Meble i Fronty

Other deals

MW 10x4 / N38 - cylindrical magnet

MPL 40x7x3 / N38 - lamellar magnet

MW 7x2 / N38 - cylindrical magnet

UMT 29x38 white / N38 - board holder

Advantages as well as disadvantages of neodymium magnets.

Best holding force of the magnet in ideal parameters – what it depends on?

What influences lifting capacity in practice

Safety rules for work with NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C