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

ring magnet

Catalog no 030203

GTIN/EAN: 5906301812203

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

see parameters »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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

Specification / characteristics - MP 5x2.7/1.2x5 Z / N38 - ring magnet

properties
properties values
Cat. no. 030203
GTIN/EAN 5906301812203
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 Z / 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 assembly - report

These data represent the direct effect of a physical simulation. Values rely on algorithms for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these data as a reference point when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MP 5x2.7/1.2x5 Z / 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
Magnetic force decreases significantly with every mm of distance. Note that even a microscopic distance (e.g., contamination, paint, dust) strongly diminishes the holding power. Magnets hold strongest at the point of direct contact; air break nullifies the power. See how quickly the pull force plummet, when the magnet does not touch directly to the metal substrate. When calculating the assembly, avoid unnecessary gaps.

Table 2: Sliding hold (vertical surface)
MP 5x2.7/1.2x5 Z / 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 following data defines the theoretical weight limit required to cause the shifting of the magnet downwards against a vertical metal surface (considering typical friction). The holding force varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 5x2.7/1.2x5 Z / 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 mounting a holder on a upright surface (e.g., a fridge), it will only hold just about 20%-30% of its nominal power. Gravity and a low friction coefficient influence the fact that magnets slide down faster than they detach. Planning a wall mount? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a much lighter cargo. Utilizing a rubberized coating can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 5x2.7/1.2x5 Z / 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 too thin steel is not enough to absorb the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you need a suitably thick piece of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MP 5x2.7/1.2x5 Z / 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 lose parameters after exceeding the maximum temperature. Avoid high temperatures – heat can permanently demagnetize this product. With increasing heat, the neodymium's force temporarily decreases. Refrain from using this magnet close to ovens exceeding its safe range. Exceeding the critical threshold will lead to irreversible degradation of magnetism.
*Important note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MP 5x2.7/1.2x5 Z / 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
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of operation. Designing a strong closure? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the impact force is extreme. The repulsion force is marginally weaker than the connection force, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Calculations show friction force of two matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MP 5x2.7/1.2x5 Z / 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
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
Powerful magnet radiation is a serious hazard to electronic devices as well as pacemakers. These magnets produce a field that disrupts operation of sensitive medical devices. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MP 5x2.7/1.2x5 Z / 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 very brittle – a collision with steel can result in shattering. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or painful pinches to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Corrosion resistance
MP 5x2.7/1.2x5 Z / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 862 Mx 8.6 µWb
Pc Coefficient 0.83 High (Stable)
Flux value emitted by the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Submerged application
MP 5x2.7/1.2x5 Z / 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Thermal stability

*For N38 material, 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%
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: 030203-2026
Measurement Calculator
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The ring magnet with a hole MP 5x2.7/1.2x5 Z / 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 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 too much pressure will cause the ring to crack. It's a good idea to use a flexible washer under the screw head, which will cushion the stresses. 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 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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 key parameter here is the holding force 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • A magnet with a smooth silver surface is more attractive,
  • Magnets exhibit maximum magnetic induction on the surface,
  • Neodymium magnets are characterized by very 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 the potential of free molding and adaptation to individualized needs, neodymium magnets can be modeled in a wide range of forms and dimensions, which makes them more universal,
  • Huge importance in modern industrial fields – they serve a role in mass storage devices, motor assemblies, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer 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
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

Information about lifting capacity was defined for ideal contact conditions, taking into account:
  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • with a cross-section no less than 10 mm
  • with an ideally smooth contact surface
  • without the slightest clearance between the magnet and steel
  • under vertical force vector (90-degree angle)
  • at temperature room level

Lifting capacity in practice – influencing factors

Real force is affected by specific conditions, mainly (from priority):
  • Distance (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the flux to be wasted into the air.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and lifting capacity.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Warnings
Magnets are brittle

Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets leads to them breaking into small pieces.

Precision electronics

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Hand protection

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

Keep away from children

Absolutely store magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.

Handling rules

Handle magnets consciously. Their huge power can surprise even professionals. Stay alert and respect their force.

Mechanical processing

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

Do not overheat magnets

Monitor thermal conditions. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and use protective gear.

Medical interference

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Magnetic media

Data protection: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Security! Learn more about risks in the article: Safety of working with magnets.