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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

see properties »

0.344 ZŁ with VAT / pcs + price for transport

0.280 ZŁ net + 23% VAT / pcs

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Technical of the product - 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 magnet - report

These data represent the result of a physical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - interaction chart
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
Grip strength drops drastically with every subsequent millimeter of distance. Note that even a very thin break (e.g., contamination, varnish, rust) noticeably reduces the pull force. Magnetic products hold most effectively at the point of direct contact; air break kills the power. Notice how flashily the parameters fall, when the product does not touch directly to the steel surface. When calculating the assembly, eliminate additional spacers.

Table 2: Slippage force (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 shows the theoretical holding capacity needed to start the shifting of the magnet down on a vertical steel plate (considering standard friction coefficient). This value is relative to the gap size between the magnet and the metal.

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
When hanging a magnet on a vertical wall (e.g., a board), it will maintain only about 20%-30% of its nominal power. Gravity and a low friction coefficient influence the fact that products move down easier than they pull off. Designing a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a noticeably lighter cargo. Application of an anti-slip coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 metal plate cannot conduct the full magnetic flux, which squanders power of the holder. Should you mount a strong magnet to a thin surface, the magnetism will penetrate 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 material oversaturation means that on delicate walls (e.g., thin profiles), the holder works worse. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - 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 parameters above the temperature limit. Avoid high temperatures – heat can irreversibly demagnetize this product. With increasing heat, the magnet's power momentarily decreases. Refrain from using this product in hot environments exceeding its operating temperature limit. Too high temperature will result in permanent loss of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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
Two magnets interact from a significantly greater distance than a magnet and steel combination. The setup of magnet-to-magnet generates a stronger field and a wider radius of performance. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the connection force, but still significant.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Note: Estimates refer to friction force of dual matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 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
A strong magnetic field poses a large risk to IT equipment as well as medical implants. These neodymiums generate a field that disrupts operation of sensitive medical devices. Be aware: the unseen radiation penetrates the body and housings. Special caution must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
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 very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the magnet. Wear eye protection when working with large magnets.

Table 9: Anti-corrosion coating durability
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. 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)
Flux value emitted by the magnet pole. Essential parameter when building generators as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Caution: On a vertical surface, the magnet holds only a fraction of its max power.

2. Plate thickness effect

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

3. Power loss vs temp

*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
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: 030451-2026
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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. 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 mounting 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. 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 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. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø5x3 mm and a weight of 0.4 g. The key parameter here is the lifting capacity amounting to approximately 0.77 kg (force ~7.50 N). The mounting hole diameter is precisely 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 Nd2Fe14B magnets.

Benefits

Apart from their consistent power, neodymium magnets have these key benefits:
  • They retain magnetic properties for almost 10 years – the loss is just ~1% (in theory),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in forming and the ability to adapt to individual projects,
  • Versatile presence in electronics industry – they serve a role in magnetic memories, electromotive mechanisms, precision medical tools, also complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complex forms in magnets, we propose using casing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

The lifting capacity listed is a result of laboratory testing performed under standard conditions:
  • using a sheet made of mild steel, acting as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by even structure
  • with total lack of distance (no coatings)
  • during pulling in a direction perpendicular to the mounting surface
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Please note that the working load will differ influenced by the following factors, starting with the most relevant:
  • Air gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Plate material – mild steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the holding force.

H&S for magnets
Risk of cracking

Watch out for shards. Magnets can fracture upon violent connection, ejecting shards into the air. Wear goggles.

Bodily injuries

Risk of injury: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

No play value

Only for adults. Tiny parts pose a choking risk, leading to severe trauma. Store out of reach of children and animals.

Health Danger

People with a pacemaker should maintain an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.

Permanent damage

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

GPS and phone interference

An intense magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Keep magnets close to a smartphone to prevent breaking the sensors.

Respect the power

Handle with care. Rare earth magnets attract from a long distance and connect with massive power, often quicker than you can react.

Sensitization to coating

A percentage of the population experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Extended handling might lead to skin redness. We suggest wear safety gloves.

Electronic devices

Data protection: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Machining danger

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Attention! Need more info? Read our article: Are neodymium magnets dangerous?