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MP 5x2.7/1.2x5 C / 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: 1-6500
Rating: 5

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

Technical modeling of the magnet - data

The following values represent the outcome of a physical analysis. Values are based on models for the class Nd₂Fe₁₄B. Operational conditions might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - interaction chart
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 decreases sharply with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, varnish, dust) noticeably reduces the pull force. Magnets work optimally in perfect adhesion; air break drastically cuts the power. Analyze how rapidly the parameters plummet, when the magnet does not touch directly to the metal substrate. When designing the mounting, eliminate unnecessary gaps.

Table 2: Slippage Capacity (Vertical Surface)
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 table below presents the estimated holding capacity necessary to start the slippage of the magnet down against a vertical steel wall (considering typical friction coefficient). This parameter depends on the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 mounting a element on a upright plane (e.g., a car body), it will maintain barely approx. 20%-30% of its nominal power. Gravitational force and a low friction coefficient mean that magnets move down easier than they pop off the substrate. Want to create a wall mount? Consider that the shear force is much weaker than the maximum static pull force. On a slippery surface, the element will slide down under a noticeably lighter load. Using a rubber pad can significantly raise the stability.

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 too thin steel is incapable of conduct the full magnetic flux, which weakens actual performance of the magnet. Should you attach a powerful product to a thin surface, the flux will penetrate right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the magnet works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (stability) - thermal limit
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

Standard neodymium magnets lose strength after exceeding the maximum temperature. Watch out for overheating – heat can permanently destroy this magnet. With increasing heat, the magnet's force temporarily lowers. Refrain from using this product close to ovens higher than its safe range. Ignoring the limit will cause destruction of magnetic properties.

*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
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 magnetic products interact from a much further distance than a magnet and sheet setup. The setup of two magnets produces a massive flux and a further horizon of performance. Want to build a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the impact force is extreme. The repulsion force is a bit weaker than the attraction, but still significant.
*Field value for N-N configuration drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).

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
Car key	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

A strong magnetic field is a large risk to electronics and pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (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 delicate – a violent impact against metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Corrosion resistance
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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Generator 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)

Total magnetic flux flowing through the magnet pole. Key data for coil applications and sensors. Pc Factor defines the working geometry.

Table 11: Hydrostatics and buoyancy
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%

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

Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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The ring-shaped magnet MP 5x2.7/1.2x5 C / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.

This is a crucial issue when working with model MP 5x2.7/1.2x5 C / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. 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 does not ensure full waterproofing. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building 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 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. Aesthetic mounting requires selecting the appropriate head size.

This model is characterized by dimensions Ø5x5 mm and a weight of 0.69 g. 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.

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 as well as disadvantages of rare earth magnets.

Benefits

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

Their strength remains stable, and after around 10 years it decreases only by ~1% (according to research),
They do not lose their magnetic properties even under close interference source,
In other words, due to the glossy layer of gold, the element gains a professional look,
They show high magnetic induction at the operating surface, making them more effective,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to versatility in constructing and the capacity to modify to specific needs,
Versatile presence in electronics industry – they are used in mass storage devices, electric motors, medical devices, and multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in small systems

Limitations

Disadvantages of neodymium magnets:

To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
Neodymium magnets lose their power 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 stability even at temperatures up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
Due to limitations in producing threads and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Magnet power was determined for ideal contact conditions, assuming:

using a base made of high-permeability steel, acting as a circuit closing element
whose transverse dimension is min. 10 mm
with a surface perfectly flat
with zero gap (without coatings)
under vertical application of breakaway force (90-degree angle)
in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Please note that the working load may be lower subject to elements below, in order of importance:

Clearance – the presence of any layer (rust, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Warnings

Pinching danger

Big blocks can break fingers in a fraction of a second. Never put your hand between two attracting surfaces.

Precision electronics

GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Power loss in heat

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Fragile material

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Data carriers

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Powerful field

Handle with care. Rare earth magnets act from a distance and connect with huge force, often quicker than you can react.

Machining danger

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

This is not a toy

Product intended for adults. Tiny parts pose a choking risk, causing serious injuries. Store out of reach of children and animals.

Metal Allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness happens, cease working with magnets and wear gloves.

Warning for heart patients

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Danger! Learn more about hazards in the article: Safety of working with magnets.

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

Do you have trouble choosing?

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

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - data

1. Wall mount (shear)

2. Steel thickness impact

3. Power loss vs temp

Force (Pull)

Magnetic Field

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Advantages as well as disadvantages of rare earth magnets.

Benefits

Limitations

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Lifting capacity in practice – influencing factors

Pinching danger

Precision electronics

Power loss in heat

Fragile material

Data carriers

Powerful field

Machining danger

This is not a toy

Metal Allergy

Warning for heart patients

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C