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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

0.680net / pcs

0.836 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Quantity
Net
Gross
price from 1 pcs
0.680 zł
0.836 zł
price from 900 pcs
0.639 zł
0.786 zł
price from 3700 pcs
0.598 zł
0.736 zł

Frequently asked questions

What is the hole in a ring magnet for?
For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.
What is the polarisation?
Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.
What sizes are available?
Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

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.

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Product card - 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 310 °C
Curie Temperature TF 590 °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 simulation of the magnet - data

Presented data are the outcome of a physical calculation. Results are based on algorithms for the class Nd2Fe14B. Operational performance may differ. Please consider these calculations as a supplementary guide for designers.

Table 1: Static pull force (force vs distance) - 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
safe
1 mm 3295 Gs
329.5 mT
0.29 kg / 0.63 LBS
287.5 g / 2.8 N
safe
2 mm 1883 Gs
188.3 mT
0.09 kg / 0.21 LBS
93.9 g / 0.9 N
safe
3 mm 1098 Gs
109.8 mT
0.03 kg / 0.07 LBS
31.9 g / 0.3 N
safe
5 mm 440 Gs
44.0 mT
0.01 kg / 0.01 LBS
5.1 g / 0.1 N
safe
10 mm 92 Gs
9.2 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
safe
15 mm 33 Gs
3.3 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
20 mm 15 Gs
1.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
30 mm 5 Gs
0.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Slippage force (wall)
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

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

Table 4: Steel thickness (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

Table 5: Thermal stability (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

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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

Table 7: Hazards (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 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

Table 8: Impact energy (kinetic energy) - warning
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

Table 9: Coating parameters (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)

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)

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

1. Sliding resistance

*Caution: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Temperature resistance

*For standard magnets, the safety limit 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 specification and ecology

Chemical composition

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
Magnet Unit Converter

Pulling force


Magnetic Field

See also proposals

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. This product with a force of 0.75 kg works great as a door latch, speaker holder, or spacer 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 hard but breakable and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure 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. 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. 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.
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. 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.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after around ten years it drops only by ~1% (theoretically),
  • Neodymium magnets prove to be remarkably resistant to magnetic field loss caused by external interference,
  • In other words, due to the aesthetic layer of nickel, the element gains visual value,
  • Magnetic induction on the working layer of the magnet is strong,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise machining and adjusting to defined applications,
  • Huge importance in electronics industry – they are commonly used in computer drives, brushless drives, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of producing nuts in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

The force parameter is a result of laboratory testing conducted under the following configuration:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • under conditions of ideal adhesion (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Lifting capacity in practice – influencing factors

Real force impacted by specific conditions, such as (from priority):
  • Clearance – the presence of foreign body (rust, dirt, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin plate does not close the flux, causing part of the flux to be lost into the air.
  • Metal type – not every steel attracts identically. High carbon content weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.

H&S for magnets
Danger to pacemakers

Individuals with a ICD should maintain an absolute distance from magnets. The magnetic field can interfere with the functioning of the life-saving device.

GPS Danger

GPS units and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Adults only

Always store magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are life-threatening.

Skin irritation risks

Some people suffer from a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in an allergic reaction. It is best to wear safety gloves.

Do not overheat magnets

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

Powerful field

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Combustion hazard

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Eye protection

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

Pinching danger

Pinching hazard: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Safe distance

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Warning! Need more info? Check our post: Are neodymium magnets dangerous?