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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

product parameters »

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 analysis of the product - report

These data constitute the result of a physical simulation. Values were calculated on algorithms for the material Nd2Fe14B. Actual performance might slightly differ. Use these calculations as a reference point during assembly planning.

Table 1: Static 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
Magnetic force drops drastically per each millimeter of spacing. Remember that even a microscopic distance (e.g., dirt, varnish, rust) significantly diminishes the holding power. Magnets hold most effectively in perfect adhesion; gap weakens the power. Notice how quickly the load capacity drop, when the magnet does not touch tightly to the metal substrate. When calculating the assembly, discard additional spacers.

Table 2: Slippage capacity (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
The table below calculates the theoretical force sufficient to cause the shifting of the magnet vertically on a upright metal surface (assuming typical friction coefficient). This parameter is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 placing a element on a vertical surface (e.g., a car body), it will maintain only approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient influence the fact that products slide down easier than they pop off the substrate. Designing a wall mount? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a significantly smaller weight. Using a rubber layer can significantly increase the grip.

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 too thin steel cannot focus the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a too thin substrate, the field will pass right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you need a suitably thick element of metal. The saturation effect causes that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We advise picking the steel cross-section based on the following data.

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 parameters above the temperature limit. Watch out for overheating – excessive heat can permanently damage this magnet. With increasing heat, the neodymium's capacity momentarily drops. Do not use this product in hot environments higher than its working range. Ignoring the limit will lead to destruction of magnetic properties.
*Important note: Temperature resistance is determined by both 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. The danger warning in the table points to a risk of irreversible loss for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 magnetic products attract each other from a significantly greater distance than a magnet and steel setup. The connection of two magnets creates a more powerful interaction and a wider radius of performance. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is a bit weaker than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Results apply to sliding force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni layer).

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
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 is a large risk to IT equipment and medical implants. These neodymiums produce a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

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 collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

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 in coil applications as well as sensors. The Pc coefficient defines the working geometry.

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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its max power.

2. Steel saturation

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

3. Thermal stability

*For N38 material, 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

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%
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: 030451-2026
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The ring magnet with a hole MP 5x1.5x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
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. One turn too many can destroy the magnet, so do it slowly. 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. 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.
A screw or bolt with a thread diameter smaller than 1.5 mm fits this model. 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.
The presented product is a ring magnet with dimensions Ø5 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 0.77 kg, which translates to 7.50 N in newtons. The mounting hole diameter is precisely 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.

Strengths as well as weaknesses of neodymium magnets.

Strengths

Apart from their notable power, 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 feature excellent resistance to magnetic field loss when exposed to external magnetic sources,
  • Thanks to the glossy finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
  • Magnetic induction on the working layer of the magnet turns out to be extremely intense,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures approaching 230°C and above...
  • In view of the possibility of accurate molding and customization to individualized needs, neodymium magnets can be modeled in a wide range of forms and dimensions, which increases their versatility,
  • Fundamental importance in electronics industry – they are commonly used in data components, electromotive mechanisms, precision medical tools, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Disadvantages

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these products can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

The declared magnet strength represents the maximum value, recorded under ideal test conditions, specifically:
  • using a sheet made of low-carbon steel, functioning as a ideal flux conductor
  • possessing a thickness of min. 10 mm to avoid saturation
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction vertical to the mounting surface
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Bear in mind that the application force will differ subject to elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of induction. Check the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Risk of cracking

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Impact on smartphones

Be aware: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your mobile, tablet, and GPS.

ICD Warning

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Cards and drives

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Mechanical processing

Powder produced during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Safe operation

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Allergy Warning

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness appears, immediately stop handling magnets and use protective gear.

Hand protection

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

Permanent damage

Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

This is not a toy

Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.

Warning! Want to know more? Read our article: Are neodymium magnets dangerous?