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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

2.47 with VAT / pcs + price for transport

2.01 ZŁ net + 23% VAT / pcs

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Product card - 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

Technical analysis of the magnet - report

These values are the outcome of a physical simulation. Results were calculated on models for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these calculations as a reference point when designing systems.

Table 1: Static force (force vs distance) - power drop
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
safe
3 mm 1410 Gs
141.0 mT
1.12 kg / 2.46 lbs
1117.9 g / 11.0 N
safe
5 mm 943 Gs
94.3 mT
0.50 kg / 1.10 lbs
500.1 g / 4.9 N
safe
10 mm 335 Gs
33.5 mT
0.06 kg / 0.14 lbs
63.3 g / 0.6 N
safe
15 mm 140 Gs
14.0 mT
0.01 kg / 0.02 lbs
11.1 g / 0.1 N
safe
20 mm 69 Gs
6.9 mT
0.00 kg / 0.01 lbs
2.7 g / 0.0 N
safe
30 mm 24 Gs
2.4 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
safe
50 mm 6 Gs
0.6 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Slippage capacity (vertical surface)
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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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

Table 4: Material efficiency (saturation) - sheet metal selection
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

Table 5: Thermal stability (material behavior) - resistance threshold
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

Table 6: Two magnets (attraction) - field range
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

Table 7: Protective zones (implants) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 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

Table 8: Collisions (cracking risk) - 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

Table 9: Corrosion resistance
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)

Table 10: Electrical 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)

Table 11: Hydrostatics and buoyancy
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.
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains only ~20% of its max power.

2. Steel thickness impact

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

3. Heat tolerance

*For standard magnets, 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

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: 030181-2026
Quick Unit Converter
Pulling force

Field Strength

Other products

It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables quick installation 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 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. 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.
A screw or bolt with a thread diameter smaller than 8/4 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.
It is a magnetic ring with a diameter of 14 mm and thickness 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.53 kg (force ~24.85 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths and weaknesses of neodymium magnets.

Pros

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
  • They maintain their magnetic properties even under external field action,
  • By covering with a decorative layer of silver, the element has an modern look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise machining as well as adapting to precise requirements,
  • Key role in advanced technology sectors – they find application in HDD drives, electric drive systems, medical devices, as well as modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. 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 power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • 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, in case of application outdoors
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these products can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Detachment force of the magnet in optimal conditionswhat affects it?

Breakaway force was defined for ideal contact conditions, taking into account:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • whose thickness equals approx. 10 mm
  • characterized by lack of roughness
  • with total lack of distance (no paint)
  • during detachment in a direction perpendicular to the plane
  • at temperature room level

Lifting capacity in practice – influencing factors

In practice, the real power is determined by several key aspects, presented from most significant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes 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 plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin sheet does not accept the full field, causing part of the power to be wasted to the other side.
  • Material type – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of force. Check the thermal limit for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Warnings
Threat to navigation

An intense magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a device to prevent damaging the sensors.

Power loss in heat

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Fire warning

Machining of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Caution required

Handle magnets with awareness. Their huge power can surprise even experienced users. Stay alert and respect their force.

Warning for allergy sufferers

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

Implant safety

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Product not for children

Product intended for adults. Tiny parts pose a choking risk, causing intestinal necrosis. Keep away from children and animals.

Protective goggles

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Hand protection

Large magnets can break fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

Keep away from computers

Powerful magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98