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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

0.62 g

Magnetization Direction

↑ axial

Load capacity

1.04 kg / 10.16 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	0.62 g
Magnetization Direction	↑ axial
Load capacity ~ ?	1.04 kg / 10.16 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

Engineering simulation of the magnet - data

Presented data are the outcome of a physical analysis. Values are based on algorithms for the NdFeB class. Real-world conditions may differ. Please consider these calculations as a reference point during the design process.

Table 1: Static force (pull vs gap) - 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	1.04 kg / 1040.0 g 10.2 N	weak
1 mm	3295 Gs 329.5 mT	0.40 kg / 398.6 g 3.9 N	weak
2 mm	1883 Gs 188.3 mT	0.13 kg / 130.2 g 1.3 N	weak
5 mm	440 Gs 44.0 mT	0.01 kg / 7.1 g 0.1 N	weak
10 mm	92 Gs 9.2 mT	0.00 kg / 0.3 g 0.0 N	weak
15 mm	33 Gs 3.3 mT	0.00 kg / 0.0 g 0.0 N	weak
20 mm	15 Gs 1.5 mT	0.00 kg / 0.0 g 0.0 N	weak
30 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	weak
50 mm	1 Gs 0.1 mT	0.00 kg / 0.0 g 0.0 N	weak

Pulling power drops drastically per each mm of gap. Note that even the smallest insulation layer (e.g., contamination, paint, rust) strongly reduces the pull force. Magnets work most effectively at the point of contact; distance drastically cuts the force. Analyze how quickly the load capacity plummets when the magnet does not touch directly to the metal. When designing the assembly, avoid unnecessary gaps.

Table 2: Wall mounting (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	0.31 kg / 312.0 g 3.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.21 kg / 208.0 g 2.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.10 kg / 104.0 g 1.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.52 kg / 520.0 g 5.1 N

When mounting a holder on a vertical surface (e.g., a car body), it will maintain just about 1/5 of its nominal pull. Gravity as well as a low degree of grip mean that magnets slide down easier than they pull off. Planning a wall mount? Remember that the sliding force is much lower than the breakaway force. On a slippery steel, the magnet will slip down under a much smaller weight. Using an anti-slip coating can significantly increase the grip.

Table 3: Material efficiency (substrate influence) - power losses
MP 5x2.7/1.2x5 C / N38

Steel Thickness (mm)	% Power	Real Pull (kg)
0.5 mm	10%	0.10 kg / 104.0 g 1.0 N
1 mm	25%	0.26 kg / 260.0 g 2.6 N
2 mm	50%	0.52 kg / 520.0 g 5.1 N
5 mm	100%	1.04 kg / 1040.0 g 10.2 N
10 mm	100%	1.04 kg / 1040.0 g 10.2 N

A too thin steel plate cannot absorb the entire magnetic field, which wastes the magnet's potential. If you mount a strong magnet to thin surfaces, the field will pass right through and the force will be lower. To achieve 100% of this neodymium's potential, you require a sufficiently solid piece of metal. The saturation phenomenon means that on delicate elements (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel thickness based on the following data.

Table 4: Thermal resistance (behavior) - thermal limit
MP 5x2.7/1.2x5 C / N38

Ambient Temp. (°C)	Power Loss	Remaining Pull	Status
20 °C	0.0%	1.04 kg / 1040.0 g 10.2 N	OK
40 °C	-2.2%	1.02 kg / 1017.1 g 10.0 N	OK
60 °C	-4.4%	0.99 kg / 994.2 g 9.8 N	OK
80 °C	-6.6%	0.97 kg / 971.4 g 9.5 N
100 °C	-28.8%	0.74 kg / 740.5 g 7.3 N

Ordinary neodymium magnets lose their power after exceeding the maximum temperature. Avoid high temperatures – heat can permanently damage this magnet. As the temperature rises, the neodymium's force temporarily drops. Do not use this magnet near ovens exceeding its operating temperature limit. Ignoring the limit will cause permanent loss of magnetism.

Table 5: Magnet-Magnet interaction (attraction) - field range
MP 5x2.7/1.2x5 C / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	1.56 kg / 1560.0 g 15.3 N	N/A
2 mm	0.20 kg / 195.0 g 1.9 N	0.18 kg / 182.0 g 1.8 N
5 mm	0.02 kg / 15.0 g 0.1 N	0.01 kg / 14.0 g 0.1 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 attract each other from a much further distance than a neodymium and metal setup. A two-magnet setup generates a more powerful interaction and a larger radius of operation. Planning to create a solid closure? Utilize a pair of neodymiums instead of a neodymium and a steel piece. Remember that when bringing together two magnets, the impact force is huge. The repulsion force is a bit lower than the attraction, but still impressive.

Table 6: Protective zones (implants) - warnings
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 / Implant	10 Gs (1.0 mT)	2.5 cm
Mechanical watch	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 major hazard to electronic devices as well as pacemakers. These magnets generate a field that destroys the function of sensitive medical devices. Remember: the unseen radiation penetrates tissues and plastic. Special care must be exercised by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and screens. Keep the magnet near cards, hard drives, or sensitive measuring tools.

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

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	41.31 km/h (11.48 m/s)	0.04 J
30 mm	71.54 km/h (19.87 m/s)	0.12 J
50 mm	92.36 km/h (25.66 m/s)	0.20 J
100 mm	130.62 km/h (36.28 m/s)	0.41 J

Neodymium magnets are very brittle – a violent collision with steel risks chipping. Watch out for the connection speed – a magnet left loose becomes dangerous. Impact energy can trigger material chips or painful pinches of fingers. Be sure to hold the product during mounting so it doesn't hit the steel with great force. A contact at a speed of dozens of km/h almost guarantees the shattering of the neodymium. Use protective goggles when playing with large specimens.

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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 9: Underwater work (magnet fishing)
MP 5x2.7/1.2x5 C / N38

Environment	Effective Steel Pull	Effect
Air (Land)	1.04 kg	Standard
Water (Riverbed)	1.19 kg (+0.15 kg Buoyancy gain)	+14.5%

Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than it would hold in the air.

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The ring-shaped magnet MP 5x2.7/1.2x5 C / 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 5x2.7/1.2x5 C / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. 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 rubberized holders 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.

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 1.04 kg, which translates to 10.16 N in newtons. The mounting hole diameter is precisely 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. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths and weaknesses of neodymium magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
They retain their magnetic properties even under close interference source,
The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to flexibility in shaping and the ability to modify to client solutions,
Significant place in advanced technology sectors – they are commonly used in computer drives, electric drive systems, medical equipment, as well as multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited ability of creating nuts in the magnet and complex shapes - preferred is a housing - mounting mechanism.
Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Detachment force of the magnet in optimal conditions – what it depends on?

Holding force of 1.04 kg is a measurement result performed under specific, ideal conditions:

using a base made of high-permeability steel, acting as a circuit closing element
with a thickness minimum 10 mm
with a plane free of scratches
without any clearance between the magnet and steel
during detachment in a direction perpendicular to the mounting surface
at conditions approx. 20°C

Lifting capacity in real conditions – factors

Effective lifting capacity is affected by working environment parameters, including (from most important):

Clearance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 75%. Additionally, even a slight gap {between} the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets

Do not give to children

NdFeB magnets are not toys. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

Phone sensors

Be aware: rare earth magnets produce a field that interferes with precision electronics. Keep a safe distance from your phone, tablet, and GPS.

Electronic hazard

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

Warning for heart patients

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Metal Allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease handling magnets and use protective gear.

Handling guide

Exercise caution. Neodymium magnets act from a distance and connect with massive power, often faster than you can move away.

Dust explosion hazard

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Magnets are brittle

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Demagnetization risk

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Finger safety

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Important!

More info about hazards in the article: Magnet Safety Guide.

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 magnet - data

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Strengths and weaknesses of neodymium magnets.

Detachment force of the magnet in optimal conditions – what it depends on?

Lifting capacity in real conditions – factors

Safety rules for work with neodymium magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C