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MP 14x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030181

GTIN/EAN: 5906301811985

5.00

Diameter

14 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

3.18 g

Magnetization Direction

↑ axial

Load capacity

2.53 kg / 24.85 N

Magnetic Induction

244.11 mT / 2441 Gs

Coating

[NiCuNi] Nickel

check parameters »

2.47 ZŁ with VAT / pcs + price for transport

2.01 ZŁ net + 23% VAT / pcs

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Technical data of the product - MP 14x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 14x8/4x3 / N38 - ring magnet

properties
properties values
Cat. no. 030181
GTIN/EAN 5906301811985
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 14 mm [±0,1 mm]
internal diameter Ø 8/4 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 3.18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.53 kg / 24.85 N
Magnetic Induction ~ ? 244.11 mT / 2441 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 14x8/4x3 / 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 analysis of the magnet - report

The following data are the outcome of a mathematical analysis. Results were calculated on models for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these data as a reference point for designers.

Table 1: Static force (pull vs gap) - interaction chart
MP 14x8/4x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2121 Gs
212.1 mT
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
 medium risk
1 mm 1927 Gs
192.7 mT
 2.09 kg / 4.61 LBS
2090.1 g / 20.5 N
 medium risk
2 mm 1676 Gs
167.6 mT
 1.58 kg / 3.48 LBS
1579.6 g / 15.5 N
 weak grip
3 mm 1410 Gs
141.0 mT
 1.12 kg / 2.46 LBS
1117.9 g / 11.0 N
 weak grip
5 mm 943 Gs
94.3 mT
 0.50 kg / 1.10 LBS
500.1 g / 4.9 N
 weak grip
10 mm 335 Gs
33.5 mT
 0.06 kg / 0.14 LBS
63.3 g / 0.6 N
 weak grip
15 mm 140 Gs
14.0 mT
 0.01 kg / 0.02 LBS
11.1 g / 0.1 N
 weak grip
20 mm 69 Gs
6.9 mT
 0.00 kg / 0.01 LBS
2.7 g / 0.0 N
 weak grip
30 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 weak grip
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Grip strength decreases drastically with every mm of spacing. Note that even a very thin break (e.g., contamination, paint, veneer) significantly reduces the pull force. Neodymiums hold most effectively in perfect adhesion; gap kills the force. See how flashily the load capacity plummet, when the magnet does not adhere tightly to the steel surface. When calculating the mounting, discard redundant distances.

Table 2: Sliding force (wall)
MP 14x8/4x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.51 kg / 1.12 LBS
506.0 g / 5.0 N
1 mm Stal (~0.2) 0.42 kg / 0.92 LBS
418.0 g / 4.1 N
2 mm Stal (~0.2) 0.32 kg / 0.70 LBS
316.0 g / 3.1 N
3 mm Stal (~0.2) 0.22 kg / 0.49 LBS
224.0 g / 2.2 N
5 mm Stal (~0.2) 0.10 kg / 0.22 LBS
100.0 g / 1.0 N
10 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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 required to cause the sliding of the magnet vertically against a upright steel plate (assuming standard friction). This parameter is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MP 14x8/4x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.76 kg / 1.67 LBS
759.0 g / 7.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.51 kg / 1.12 LBS
506.0 g / 5.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.25 kg / 0.56 LBS
253.0 g / 2.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.27 kg / 2.79 LBS
1265.0 g / 12.4 N
When hanging a holder on a vertical surface (e.g., a fridge), it will maintain just about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that holders move down faster than they detach. Planning a wall mount? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a noticeably lighter cargo. Utilizing a rubberized coating can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
MP 14x8/4x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.25 kg / 0.56 LBS
253.0 g / 2.5 N
1 mm
25%
 0.63 kg / 1.39 LBS
632.5 g / 6.2 N
2 mm
50%
 1.27 kg / 2.79 LBS
1265.0 g / 12.4 N
3 mm
75%
 1.90 kg / 4.18 LBS
1897.5 g / 18.6 N
5 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
10 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
11 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
12 mm
100%
 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
A thin sheet cannot take in the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you need a suitably thick element of steel. The saturation effect means that on delicate walls (e.g., thin profiles), the product works worse. We recommend selecting the steel thickness based on the following data.

Table 5: Working in heat (stability) - thermal limit
MP 14x8/4x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.53 kg / 5.58 LBS
2530.0 g / 24.8 N
 OK
40 °C -2.2% 2.47 kg / 5.45 LBS
2474.3 g / 24.3 N
 OK
60 °C -4.4% 2.42 kg / 5.33 LBS
2418.7 g / 23.7 N
80 °C -6.6% 2.36 kg / 5.21 LBS
2363.0 g / 23.2 N
100 °C -28.8% 1.80 kg / 3.97 LBS
1801.4 g / 17.7 N
Standard neodymium magnets change their properties power above the temperature limit. Watch out for overheating – high temperature can irreversibly destroy this magnet. With every degree above norm, the neodymium's force momentarily lowers. Do not use this product close to heaters higher than its safe range. Ignoring the limit will result in permanent loss of magnetism.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MP 14x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.33 kg / 7.34 LBS
3 647 Gs
0.50 kg / 1.10 LBS
500 g / 4.9 N
 N/A
1 mm 3.07 kg / 6.76 LBS
4 070 Gs
0.46 kg / 1.01 LBS
460 g / 4.5 N
 2.76 kg / 6.09 LBS
~0 Gs
2 mm 2.75 kg / 6.07 LBS
3 855 Gs
0.41 kg / 0.91 LBS
413 g / 4.0 N
 2.48 kg / 5.46 LBS
~0 Gs
3 mm 2.42 kg / 5.33 LBS
3 612 Gs
0.36 kg / 0.80 LBS
362 g / 3.6 N
 2.17 kg / 4.79 LBS
~0 Gs
5 mm 1.76 kg / 3.88 LBS
3 084 Gs
0.26 kg / 0.58 LBS
264 g / 2.6 N
 1.59 kg / 3.50 LBS
~0 Gs
10 mm 0.66 kg / 1.45 LBS
1 886 Gs
0.10 kg / 0.22 LBS
99 g / 1.0 N
 0.59 kg / 1.31 LBS
~0 Gs
20 mm 0.08 kg / 0.18 LBS
671 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
77 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
47 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
31 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
21 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
15 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
11 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets attract each other from a much further distance than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a wider radius of performance. Designing a solid fastener? Apply two magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the collision energy is massive. The repulsion force is slightly lower than the attraction, but still impressive.
*Flux density in repulsion mode reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Note: Estimates apply to friction force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
MP 14x8/4x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a large risk to IT equipment and medical implants. These magnets generate a field that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MP 14x8/4x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.89 km/h
(8.02 m/s)
 0.10 J
30 mm 49.27 km/h
(13.69 m/s)
 0.30 J
50 mm 63.61 km/h
(17.67 m/s)
 0.50 J
100 mm 89.96 km/h
(24.99 m/s)
 0.99 J
Magnetic elements are delicate – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 14x8/4x3 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MP 14x8/4x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 101 Mx 31.0 µWb
Pc Coefficient 0.28 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 14x8/4x3 / N38

Environment Effective steel pull Effect
Air (land) 2.53 kg Standard
Water (riverbed) 2.90 kg
(+0.37 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical surface, the magnet retains only approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Thermal stability

*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) = 0.28

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.

Technical and environmental data
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: 030181-2026
Measurement Calculator
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The ring-shaped magnet MP 14x8/4x3 / 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 2.53 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 14x8/4x3 / 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. 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 inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 8/4 mm fits this model. 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 14 mm and thickness 3 mm. The key parameter here is the holding force amounting to approximately 2.53 kg (force ~24.85 N). The mounting hole diameter is precisely 8/4 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of rare earth magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • They possess excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
  • In other words, due to the metallic surface of gold, the element is aesthetically pleasing,
  • Magnetic induction on the working layer of the magnet remains strong,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Due to the potential of flexible shaping and customization to specialized solutions, neodymium magnets can be produced in a broad palette of shapes and sizes, which amplifies use scope,
  • Huge importance in advanced technology sectors – they are commonly used in HDD drives, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power 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
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of making nuts in the magnet and complicated shapes - recommended is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Additionally, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The declared magnet strength represents the peak performance, measured under ideal test conditions, meaning:
  • on a base made of structural steel, optimally conducting the magnetic field
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface free of scratches
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Determinants of lifting force in real conditions

In real-world applications, the real power depends on several key aspects, ranked from crucial:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic properties and holding force.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Product not for children

Product intended for adults. Small elements can be swallowed, leading to serious injuries. Store out of reach of children and animals.

ICD Warning

Patients with a heart stimulator must keep an absolute distance from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Flammability

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Finger safety

Danger of trauma: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Conscious usage

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Thermal limits

Do not overheat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Beware of splinters

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.

Metal Allergy

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.

Threat to navigation

GPS units and smartphones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Magnetic media

Equipment safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Attention! Details about hazards in the article: Safety of working with magnets.