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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

technical specifications »

0.344 ZŁ with VAT / pcs + price for transport

0.280 ZŁ net + 23% VAT / pcs

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Technical - 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

Engineering simulation of the assembly - data

Presented values constitute the outcome of a mathematical calculation. Results rely on models for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - 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
Pulling power weakens sharply with every subsequent millimeter of gap. Remember that even a microscopic distance (e.g., contamination, paint, veneer) noticeably reduces the pull force. Magnetic products work most effectively at the point of direct contact; air break weakens the power. See how flashily the load capacity drop, when the magnet does not touch directly to the steel surface. When designing the mounting, discard redundant distances.

Table 2: Shear load (vertical surface)
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
The table below defines the approximate holding capacity required to cause the sliding of the magnet vertically against a vertical steel wall (assuming typical friction). The holding force varies with the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
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
When mounting a element on a vertical surface (e.g., a car body), it you can count on just approx. 1/5 of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that magnets slip easier than they pop off the substrate. Designing a wall mount? Note that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a much lighter weight. Utilizing a rubberized layer can significantly increase the grip.

Table 4: Material efficiency (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
A thin sheet is unable to conduct the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the field will pass right through and the holding will be smaller. To squeeze the maximum of this neodymium's power, you need a suitably thick element of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the product works worse. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (stability) - thermal limit
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
Classic neodymiums change their properties power after exceeding the maximum temperature. Avoid high temperatures – excessive heat can irreversibly demagnetize this magnet. With increasing heat, the neodymium's power briefly decreases. Refrain from using this magnet close to ovens higher than its working range. Ignoring the limit will result in irreversible degradation of magnetism.
*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 5x1.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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
Two magnets interact from a much further distance than a magnet and sheet setup. The connection of two magnets creates a more powerful interaction and a further horizon of performance. Planning to create a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the impact force is huge. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction for N-N configuration drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Estimates apply to sliding force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
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
Car key 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
A strong magnetic field poses a large risk to electronics as well as pacemakers. These NdFeB products produce a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (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
Magnetic elements are delicate – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly 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. Wear safety glasses when working with powerful specimens.

Table 9: Surface protection spec
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MP 5x1.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 811 Mx 8.1 µWb
Pc Coefficient 1.66 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains merely ~20% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Heat tolerance

*For N38 material, the max working temp is 80°C.

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

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

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.

Engineering data and GPSR
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%
Environmental data
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
Quick Unit Converter
Force (pull)
Magnetic Induction
Simply fill in a single box, and the tool compute the rest instantly.

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The ring-shaped magnet MP 5x1.5x3 / N38 is created for permanent mounting, 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 door latch, 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 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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 magnets in hermetic housing 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 Ø5x3 mm and a weight of 0.4 g. 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.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of rare earth magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • They retain their magnetic properties even under close interference source,
  • In other words, due to the glossy surface of gold, the element looks attractive,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of accurate forming as well as optimizing to specific conditions,
  • Wide application in high-tech industry – they serve a role in mass storage devices, brushless drives, diagnostic systems, as well as technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under the following configuration:
  • on a base made of structural steel, effectively closing the magnetic field
  • whose transverse dimension is min. 10 mm
  • with an polished contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Bear in mind that the working load will differ influenced by elements below, starting with the most relevant:
  • Distance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Machining danger

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Do not give to children

Always store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are tragic.

Risk of cracking

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Safe distance

Intense magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Magnetic interference

Be aware: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your mobile, tablet, and navigation systems.

Handling rules

Be careful. Neodymium magnets act from a distance and snap with massive power, often faster than you can move away.

Warning for heart patients

Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Crushing force

Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Do not overheat magnets

Control the heat. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Nickel allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, immediately stop working with magnets and use protective gear.

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