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MP 5x1.5x3 / N38 - ring magnet

ring magnet

Catalog no 030451

GTIN/EAN: 5906301812357

5.00

Diameter

5 mm [±0,1 mm]

internal diameter Ø

1.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

0.4 g

Magnetization Direction

↑ axial

Load capacity

0.77 kg / 7.50 N

Magnetic Induction

475.16 mT / 4752 Gs

Coating

[NiCuNi] Nickel

0.344 with VAT / pcs + price for transport

0.280 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical details - MP 5x1.5x3 / N38 - ring magnet

Specification / characteristics - MP 5x1.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030451
GTIN/EAN 5906301812357
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 1.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 0.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.77 kg / 7.50 N
Magnetic Induction ~ ? 475.16 mT / 4752 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 5x1.5x3 / 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 assembly - technical parameters

Presented values are the result of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Operational performance may differ. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MP 5x1.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6157 Gs
615.7 mT
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
safe
1 mm 3880 Gs
388.0 mT
0.31 kg / 0.67 LBS
305.8 g / 3.0 N
safe
2 mm 2310 Gs
231.0 mT
0.11 kg / 0.24 LBS
108.4 g / 1.1 N
safe
3 mm 1422 Gs
142.2 mT
0.04 kg / 0.09 LBS
41.0 g / 0.4 N
safe
5 mm 641 Gs
64.1 mT
0.01 kg / 0.02 LBS
8.3 g / 0.1 N
safe
10 mm 174 Gs
17.4 mT
0.00 kg / 0.00 LBS
0.6 g / 0.0 N
safe
15 mm 76 Gs
7.6 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
safe
20 mm 41 Gs
4.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
30 mm 16 Gs
1.6 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Slippage force (wall)
MP 5x1.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.15 kg / 0.34 LBS
154.0 g / 1.5 N
1 mm Stal (~0.2) 0.06 kg / 0.14 LBS
62.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 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 (sliding) - behavior on slippery surfaces
MP 5x1.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.23 kg / 0.51 LBS
231.0 g / 2.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 0.34 LBS
154.0 g / 1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.17 LBS
77.0 g / 0.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.39 kg / 0.85 LBS
385.0 g / 3.8 N

Table 4: Steel thickness (substrate influence) - power losses
MP 5x1.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.08 kg / 0.17 LBS
77.0 g / 0.8 N
1 mm
25%
0.19 kg / 0.42 LBS
192.5 g / 1.9 N
2 mm
50%
0.39 kg / 0.85 LBS
385.0 g / 3.8 N
3 mm
75%
0.58 kg / 1.27 LBS
577.5 g / 5.7 N
5 mm
100%
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
10 mm
100%
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
11 mm
100%
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
12 mm
100%
0.77 kg / 1.70 LBS
770.0 g / 7.6 N

Table 5: Thermal stability (material behavior) - power drop
MP 5x1.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.77 kg / 1.70 LBS
770.0 g / 7.6 N
OK
40 °C -2.2% 0.75 kg / 1.66 LBS
753.1 g / 7.4 N
OK
60 °C -4.4% 0.74 kg / 1.62 LBS
736.1 g / 7.2 N
OK
80 °C -6.6% 0.72 kg / 1.59 LBS
719.2 g / 7.1 N
100 °C -28.8% 0.55 kg / 1.21 LBS
548.2 g / 5.4 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 5x1.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.50 kg / 5.50 LBS
6 171 Gs
0.37 kg / 0.83 LBS
374 g / 3.7 N
N/A
1 mm 1.62 kg / 3.58 LBS
9 932 Gs
0.24 kg / 0.54 LBS
244 g / 2.4 N
1.46 kg / 3.22 LBS
~0 Gs
2 mm 0.99 kg / 2.19 LBS
7 760 Gs
0.15 kg / 0.33 LBS
149 g / 1.5 N
0.89 kg / 1.97 LBS
~0 Gs
3 mm 0.59 kg / 1.30 LBS
5 986 Gs
0.09 kg / 0.20 LBS
88 g / 0.9 N
0.53 kg / 1.17 LBS
~0 Gs
5 mm 0.21 kg / 0.47 LBS
3 600 Gs
0.03 kg / 0.07 LBS
32 g / 0.3 N
0.19 kg / 0.42 LBS
~0 Gs
10 mm 0.03 kg / 0.06 LBS
1 281 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
0.02 kg / 0.05 LBS
~0 Gs
20 mm 0.00 kg / 0.00 LBS
349 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
50 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
33 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
23 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
17 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
13 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
10 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Hazards (electronics) - precautionary measures
MP 5x1.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - warning
MP 5x1.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 44.27 km/h
(12.30 m/s)
0.03 J
30 mm 76.64 km/h
(21.29 m/s)
0.09 J
50 mm 98.94 km/h
(27.48 m/s)
0.15 J
100 mm 139.93 km/h
(38.87 m/s)
0.30 J

Table 9: Corrosion resistance
MP 5x1.5x3 / 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: Construction data (Flux)
MP 5x1.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 811 Mx 8.1 µWb
Pc Coefficient 1.66 High (Stable)

Table 11: Submerged application
MP 5x1.5x3 / N38

Environment Effective steel pull Effect
Air (land) 0.77 kg Standard
Water (riverbed) 0.88 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.
1. Shear force

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Temperature resistance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.66

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.

Engineering data and GPSR
Elemental analysis
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: 030451-2026
Measurement Calculator
Pulling force

Magnetic Field

Check out more deals

The ring magnet with a hole MP 5x1.5x3 / 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 0.77 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 5x1.5x3 / 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. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and easily scratched 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. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 5 mm and thickness 3 mm. The pulling force of this model is an impressive 0.77 kg, which translates to 7.50 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 1.5 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.

Strengths as well as weaknesses of rare earth magnets.

Advantages

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They are noted for resistance to demagnetization induced by external field influence,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnetic induction on the surface of the magnet remains strong,
  • 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...
  • Possibility of custom modeling and optimizing to concrete requirements,
  • Huge importance in modern industrial fields – they are used in HDD drives, motor assemblies, medical equipment, as well as industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing threads in the magnet and complex shapes - recommended is a housing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

The load parameter shown concerns the peak performance, obtained under laboratory conditions, specifically:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a surface perfectly flat
  • with total lack of distance (no paint)
  • during detachment in a direction perpendicular to the mounting surface
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

In real-world applications, the actual lifting capacity is determined by many variables, presented from most significant:
  • Distance – the presence of any layer (rust, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin plate causes magnetic saturation, causing part of the power to be wasted to the other side.
  • Plate material – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Crushing force

Large magnets can smash fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.

Risk of cracking

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Danger to pacemakers

Individuals with a pacemaker must maintain an large gap from magnets. The magnetism can disrupt the operation of the implant.

Thermal limits

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

GPS Danger

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Protect data

Do not bring magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

This is not a toy

Always store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

Immense force

Use magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and respect their force.

Machining danger

Powder created during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Skin irritation risks

Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation happens, immediately stop handling magnets and use protective gear.

Important! More info about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98