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

ring magnet

Catalog no 030201

GTIN/EAN: 5906301812180

5.00
Load capacity 0.75 kg / 7.31 N Magnetic Induction 553.14 mT / 5531 Gs
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
Coating
[NiCuNi] Nickel
check technical specifications »

0.836 zł with VAT / pcs + price for transport

0.680 zł net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
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Technical of the product - 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/EAN 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 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

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

Physical modeling of the magnet - technical parameters

Presented information constitute the result of a mathematical calculation. Values are based on models for the class Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide for designers.

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

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5322 Gs
532.2 mT
 0.75 kg / 1.65 LBS
750.0 g / 7.4 N
 low risk
1 mm 3295 Gs
329.5 mT
 0.29 kg / 0.63 LBS
287.5 g / 2.8 N
 low risk
2 mm 1883 Gs
188.3 mT
 0.09 kg / 0.21 LBS
93.9 g / 0.9 N
 low risk
3 mm 1098 Gs
109.8 mT
 0.03 kg / 0.07 LBS
31.9 g / 0.3 N
 low risk
5 mm 440 Gs
44.0 mT
 0.01 kg / 0.01 LBS
5.1 g / 0.1 N
 low risk
10 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 low risk
15 mm 33 Gs
3.3 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Pulling power drops drastically with every mm of distance. Keep in mind that every additional insulation layer (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnetic products operate most effectively at the point of direct contact; gap weakens the force. Analyze how quickly the load capacity plummet, when the product does not touch directly to the steel surface. When designing the arrangement, avoid unnecessary gaps.

Table 2: Shear load (vertical surface)
MP 5x2.7/1.2x5 C / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.15 kg / 0.33 LBS
150.0 g / 1.5 N
1 mm Stal (~0.2) 0.06 kg / 0.13 LBS
58.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.04 LBS
18.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below calculates the approximate force necessary to start the sliding of the magnet vertically against a upright steel plate (considering typical friction). This value is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 5x2.7/1.2x5 C / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.22 kg / 0.50 LBS
225.0 g / 2.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.17 LBS
75.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.38 kg / 0.83 LBS
375.0 g / 3.7 N
When placing a magnet on a upright wall (e.g., a car body), it will maintain only about 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip cause that holders slip faster than they detach. Planning a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slip down under a significantly smaller cargo. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 5x2.7/1.2x5 C / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.08 kg / 0.17 LBS
75.0 g / 0.7 N
1 mm
25%
 0.19 kg / 0.41 LBS
187.5 g / 1.8 N
2 mm
50%
 0.38 kg / 0.83 LBS
375.0 g / 3.7 N
3 mm
75%
 0.56 kg / 1.24 LBS
562.5 g / 5.5 N
5 mm
100%
 0.75 kg / 1.65 LBS
750.0 g / 7.4 N
10 mm
100%
 0.75 kg / 1.65 LBS
750.0 g / 7.4 N
11 mm
100%
 0.75 kg / 1.65 LBS
750.0 g / 7.4 N
12 mm
100%
 0.75 kg / 1.65 LBS
750.0 g / 7.4 N
A thin metal plate is incapable of conduct the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you need a suitably thick piece of metal. The material oversaturation causes that on thin elements (e.g., car bodies), the holder works worse. We recommend selecting the steel cross-section from these parameters.

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

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.75 kg / 1.65 LBS
750.0 g / 7.4 N
 OK
40 °C -2.2% 0.73 kg / 1.62 LBS
733.5 g / 7.2 N
 OK
60 °C -4.4% 0.72 kg / 1.58 LBS
717.0 g / 7.0 N
 OK
80 °C -6.6% 0.70 kg / 1.54 LBS
700.5 g / 6.9 N
100 °C -28.8% 0.53 kg / 1.18 LBS
534.0 g / 5.2 N
Classic neodymiums lose strength past the thermal threshold. Protect against heat – excessive heat can irreversibly damage this product. With increasing heat, the neodymium's power temporarily decreases. Avoid using this magnet close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) risk losing magnetic properties at lower temperatures compared to rod magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 5x2.7/1.2x5 C / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.75 kg / 6.06 LBS
5 924 Gs
0.41 kg / 0.91 LBS
412 g / 4.0 N
 N/A
1 mm 1.77 kg / 3.90 LBS
8 541 Gs
0.27 kg / 0.58 LBS
265 g / 2.6 N
 1.59 kg / 3.51 LBS
~0 Gs
2 mm 1.05 kg / 2.32 LBS
6 590 Gs
0.16 kg / 0.35 LBS
158 g / 1.5 N
 0.95 kg / 2.09 LBS
~0 Gs
3 mm 0.60 kg / 1.33 LBS
4 992 Gs
0.09 kg / 0.20 LBS
91 g / 0.9 N
 0.54 kg / 1.20 LBS
~0 Gs
5 mm 0.20 kg / 0.44 LBS
2 860 Gs
0.03 kg / 0.07 LBS
30 g / 0.3 N
 0.18 kg / 0.39 LBS
~0 Gs
10 mm 0.02 kg / 0.04 LBS
880 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
20 mm 0.00 kg / 0.00 LBS
184 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
16 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
10 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
6 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
4 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
3 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
2 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a wider radius than a neodymium and metal setup. Such a system of two magnets creates a more powerful interaction and a larger range of operation. Designing a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
Note: Estimates demonstrate friction force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (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
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
Powerful magnet radiation poses a real danger to electronics and pacemakers. These neodymiums produce a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.76 km/h
(4.65 m/s)
 0.01 J
30 mm 16.76 km/h
(4.66 m/s)
 0.01 J
50 mm 16.76 km/h
(4.66 m/s)
 0.01 J
100 mm 16.76 km/h
(4.66 m/s)
 0.01 J
Neodymium magnets 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. Kinetic force can destroy the magnet or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating 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. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter Value SI Unit / Description
Magnetic Flux 862 Mx 8.6 µWb
Pc Coefficient 0.83 High (Stable)
Flux value passing through the pole surface. Essential parameter for generator designers and motors. The Pc coefficient defines the working geometry.

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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Vertical hold

*Note: On a vertical surface, the magnet retains just a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.83

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 Pc (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 Pc 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.

Technical and environmental data

Material specification

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%

Sustainability

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: 030201-2026
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12.24 zł brutto / pcs
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 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 excessive force will cause the ring to crack. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. 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 can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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.
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 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.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They retain attractive force for around 10 years – the drop is just ~1% (based on simulations),
  • They are resistant to demagnetization induced by external magnetic fields,
  • The use of an metallic 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 a key feature,
  • Neodymium magnets are characterized by extremely 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 versatility in forming and the capacity to adapt to specific needs,
  • Key role in modern technologies – they are commonly used in data components, electromotive mechanisms, precision medical tools, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using a housing - magnetic mount.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was determined for ideal contact conditions, assuming:
  • with the application of a yoke made of special test steel, ensuring full magnetic saturation
  • whose thickness equals approx. 10 mm
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at temperature room level

Key elements affecting lifting force

In real-world applications, the real power depends on a number of factors, listed from crucial:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Impact on smartphones

Note: rare earth magnets produce a field that disrupts precision electronics. Keep a safe distance from your phone, device, and GPS.

Do not give to children

Strictly keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are fatal.

Do not overheat magnets

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Bodily injuries

Watch your fingers. Two large magnets will join immediately with a force of massive weight, destroying anything in their path. Be careful!

Danger to pacemakers

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Warning for allergy sufferers

Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, avoid direct skin contact or opt for versions in plastic housing.

Fragile material

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Do not underestimate power

Be careful. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.

Fire warning

Powder generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Safe distance

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Caution! Want to know more? Read our article: Why are neodymium magnets dangerous?