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

ring magnet

Catalog no 030201

GTIN/EAN: 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

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.

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Technical data 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

Technical analysis of the magnet - data

Presented values represent the result of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Use these calculations as a reference point for designers.

Table 1: Static force (pull vs gap) - power drop
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
 weak grip
1 mm 3295 Gs
329.5 mT
 0.29 kg / 0.63 lbs
287.5 g / 2.8 N
 weak grip
2 mm 1883 Gs
188.3 mT
 0.09 kg / 0.21 lbs
93.9 g / 0.9 N
 weak grip
3 mm 1098 Gs
109.8 mT
 0.03 kg / 0.07 lbs
31.9 g / 0.3 N
 weak grip
5 mm 440 Gs
44.0 mT
 0.01 kg / 0.01 lbs
5.1 g / 0.1 N
 weak grip
10 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 weak grip
15 mm 33 Gs
3.3 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Grip strength weakens sharply per each millimeter of distance. Keep in mind that even the smallest gap (e.g., dirt, paint, dust) significantly weakens the grip. Magnetic products operate most effectively during direct contact; gap weakens the power. Notice how flashily the load capacity drop, when the magnet does not adhere flatly to the metal substrate. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Sliding force (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 shows the theoretical shear load sufficient to cause the sliding of the magnet vertically along a vertical steel wall (assuming standard friction). The holding force is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
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 element on a vertical wall (e.g., a car body), it will maintain barely approx. 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that magnets slip faster than they pop off the substrate. Want to create a vertical fastening? Note that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a noticeably lighter load. Using a rubber pad can effectively 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/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 unable to focus the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a too thin substrate, the flux will pass right through and the holding will be smaller. To squeeze 100% of this magnet's power, you require a sufficiently solid backing of steel. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the holder works worse. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - power drop
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
Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Protect against heat – high temperature can permanently demagnetize this product. As the temperature rises, the neodymium's force momentarily drops. Avoid using this magnet close to heaters higher than its operating temperature limit. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (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 much further distance than a neodymium and metal combination. The connection of magnet-to-magnet produces a massive flux and a larger range of performance. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is huge. The levitation is a bit weaker than the connection force, but still large.
*Field value between like poles drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
* Calculations demonstrate shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
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
A strong magnetic field poses a real danger to electronic devices as well as pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation acts through matter and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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
Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
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)
Total magnetic flux passing through the pole surface. Key data when building generators as well as sensors. Pc value determines 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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Note: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Temperature resistance

*For N38 material, the critical limit is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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 specification and ecology
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%
Ecology and recycling (GPSR)
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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The ring-shaped magnet 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 quick installation to wood, wall, plastic, or metal. This product with a force of 0.75 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
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 rubberized holders or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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 key parameter here is the lifting capacity amounting to approximately 0.75 kg (force ~7.31 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. 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.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Apart from their consistent power, neodymium magnets have these key benefits:
  • They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
  • Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
  • A magnet with a shiny gold surface is more attractive,
  • Magnets have impressive magnetic induction on the outer layer,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to modularity in shaping and the ability to adapt to individual projects,
  • Huge importance in modern industrial fields – they find application in HDD drives, motor assemblies, advanced medical instruments, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

The specified lifting capacity represents the peak performance, obtained under optimal environment, meaning:
  • using a plate made of mild steel, functioning as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • with direct contact (no paint)
  • during detachment in a direction vertical to the mounting surface
  • in neutral thermal conditions

What influences lifting capacity in practice

Holding efficiency is influenced by working environment parameters, such as (from priority):
  • Clearance – existence of foreign body (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with neodymium magnets
Impact on smartphones

Note: rare earth magnets generate a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Fire warning

Combustion risk: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.

Health Danger

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

Electronic devices

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

Do not give to children

Only for adults. Small elements can be swallowed, causing serious injuries. Store out of reach of kids and pets.

Risk of cracking

Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

Immense force

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent direct skin contact or choose encased magnets.

Demagnetization risk

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Bodily injuries

Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Important! Details about risks in the article: Safety of working with magnets.