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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

0.5 kg / 4.93 N

Magnetic Induction

56.04 mT

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 ~ ?	0.5 kg / 4.93 N
Magnetic Induction ~ ?	56.04 mT
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

Physical simulation of the magnet - technical parameters

Presented values are the direct effect of a engineering calculation. Results were calculated on models for the class NdFeB. Real-world performance might slightly deviate from the simulation results. Treat these calculations as a reference point during assembly planning.

Table 1: Static 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	0.50 kg / 500.0 g 4.9 N	safe
1 mm	3295 Gs 329.5 mT	0.19 kg / 191.6 g 1.9 N	safe
2 mm	1883 Gs 188.3 mT	0.06 kg / 62.6 g 0.6 N	safe
5 mm	440 Gs 44.0 mT	0.00 kg / 3.4 g 0.0 N	safe
10 mm	92 Gs 9.2 mT	0.00 kg / 0.1 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

Pulling power weakens significantly with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., contamination, paint, rust) strongly weakens the grip. Neodymiums work strongest in perfect adhesion; gap kills the force. See how flashily the parameters drop, when the magnet does not adhere tightly to the metal substrate. When calculating the arrangement, eliminate redundant distances.

Table 2: Vertical assembly (shearing) - 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	0.15 kg / 150.0 g 1.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.10 kg / 100.0 g 1.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.05 kg / 50.0 g 0.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.25 kg / 250.0 g 2.5 N

When placing a element on a upright wall (e.g., a board), it will only hold barely about 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that holders move down easier than they pop off the substrate. Planning a vertical fastening? Consider that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a noticeably lighter load. Application of an anti-slip coating can drastically raise the stability.

Table 3: Material efficiency (saturation) - sheet metal selection
MP 5x2.7/1.2x5 C / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.05 kg / 50.0 g 0.5 N
1 mm	25%	0.13 kg / 125.0 g 1.2 N
2 mm	50%	0.25 kg / 250.0 g 2.5 N
5 mm	100%	0.50 kg / 500.0 g 4.9 N
10 mm	100%	0.50 kg / 500.0 g 4.9 N

A too thin steel is incapable of conduct the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the product holds weaker. We recommend selecting the steel thickness based on the following data.

Table 4: Thermal resistance (stability) - power drop
MP 5x2.7/1.2x5 C / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.50 kg / 500.0 g 4.9 N	OK
40 °C	-2.2%	0.49 kg / 489.0 g 4.8 N	OK
60 °C	-4.4%	0.48 kg / 478.0 g 4.7 N	OK
80 °C	-6.6%	0.47 kg / 467.0 g 4.6 N
100 °C	-28.8%	0.36 kg / 356.0 g 3.5 N

Standard neodymium magnets lose parameters past the thermal threshold. Protect against heat – heat can permanently damage this magnet. With increasing heat, the neodymium's capacity temporarily lowers. Do not use this magnet close to ovens exceeding its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.

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

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	0.75 kg / 750.0 g 7.4 N	N/A
2 mm	0.09 kg / 90.0 g 0.9 N	0.08 kg / 84.0 g 0.8 N
5 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
10 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
20 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two magnets interact from a wider radius than a magnet and steel combination. Such a system of two magnets produces a massive flux and a further horizon of operation. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is extreme. The levitation is marginally weaker than the connection force, but still large.

Table 6: Safety (HSE) (electronics) - 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
Mechanical watch	20 Gs (2.0 mT)	2.0 cm
Mobile device	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

Extremely neodym field poses a serious hazard to electronics and pacemakers. These magnets produce a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 7: Impact energy (cracking risk) - warning
MP 5x2.7/1.2x5 C / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	27.15 km/h (7.54 m/s)	0.02 J
30 mm	47.02 km/h (13.06 m/s)	0.06 J
50 mm	60.71 km/h (16.86 m/s)	0.10 J
100 mm	85.85 km/h (23.85 m/s)	0.20 J

NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when playing with large magnets.

Table 8: 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)

The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 9: Physics of underwater searching
MP 5x2.7/1.2x5 C / N38

Environment	Effective steel pull	Effect
Air (land)	0.50 kg	Standard
Water (riverbed)	0.57 kg (+0.07 kg Buoyancy gain)	+14.5%

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

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

MPL 5x5x1.2 / N38 - lamellar magnet

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UMH 36x8x46 [M6] / N38 - magnetic holder with hook

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The ring magnet with a hole 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. This product with a force of 0.5 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. 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.

Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. Damage to the protective layer during assembly is the most common cause of rusting. If you must use it outside, paint it with anti-corrosion paint after mounting.

The inner hole diameter determines the maximum size of the mounting element. 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.

It is a magnetic ring with a diameter of 5 mm and thickness 5 mm. The key parameter here is the lifting capacity amounting to approximately 0.5 kg (force ~4.93 N). The mounting hole diameter is precisely 2.7/1.2 mm.

The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. 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.

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

They have unchanged lifting capacity, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
Neodymium magnets are distinguished by remarkably resistant to magnetic field loss caused by magnetic disturbances,
The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
Neodymium magnets achieve maximum magnetic induction on a their surface, which allows for strong attraction,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures approaching 230°C and above...
Possibility of custom forming as well as adjusting to atypical applications,
Universal use in electronics industry – they are commonly used in mass storage devices, drive modules, precision medical tools, as well as industrial machines.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Problematic aspects of neodymium magnets and ways of using them

They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
NdFeB magnets lose force 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 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 nuts and complicated shapes in magnets, we recommend using cover - magnetic mount.
Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small components of these magnets are able to complicate diagnosis medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

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

The load parameter shown concerns the maximum value, measured under ideal test conditions, meaning:

using a base made of high-permeability steel, acting as a circuit closing element
possessing a massiveness of min. 10 mm to ensure full flux closure
characterized by smoothness
under conditions of gap-free contact (surface-to-surface)
during pulling in a direction vertical to the plane
at room temperature

Key elements affecting lifting force

In practice, the actual holding force depends on many variables, ranked from crucial:

Clearance – existence of any layer (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets

GPS and phone interference

Note: neodymium magnets produce a field that confuses sensitive sensors. Keep a safe distance from your mobile, device, and navigation systems.

Warning for allergy sufferers

A percentage of the population have a sensitization to Ni, which is the common plating for neodymium magnets. Frequent touching can result in dermatitis. We suggest use safety gloves.

Danger to the youngest

Strictly keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are life-threatening.

Respect the power

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Health Danger

People with a heart stimulator must maintain an safe separation from magnets. The magnetism can stop the operation of the implant.

Do not drill into magnets

Fire warning: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Pinching danger

Mind your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Be careful!

Heat sensitivity

Do not overheat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Electronic hazard

Data protection: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Beware of splinters

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Attention!

Need more info? Read our article: 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

Physical simulation of the magnet - technical parameters

See also products

MPL 5x5x1.2 / N38 - lamellar magnet

RM R7 SUPER - 13000 Gs / N52 - magnetic distributor

SM 32x500 [2xM8] / N52 - magnetic separator

UMH 36x8x46 [M6] / N38 - magnetic holder with hook

Advantages as well as disadvantages of rare earth magnets.

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

Key elements affecting lifting force

Safety rules for work with neodymium magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C