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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

product parameters »

2.47 ZŁ with VAT / pcs + price for transport

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Technical - 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 product - data

Presented information represent the result of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull 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 pounds
2530.0 g / 24.8 N
 strong
1 mm 1927 Gs
192.7 mT
 2.09 kg / 4.61 pounds
2090.1 g / 20.5 N
 strong
2 mm 1676 Gs
167.6 mT
 1.58 kg / 3.48 pounds
1579.6 g / 15.5 N
 safe
3 mm 1410 Gs
141.0 mT
 1.12 kg / 2.46 pounds
1117.9 g / 11.0 N
 safe
5 mm 943 Gs
94.3 mT
 0.50 kg / 1.10 pounds
500.1 g / 4.9 N
 safe
10 mm 335 Gs
33.5 mT
 0.06 kg / 0.14 pounds
63.3 g / 0.6 N
 safe
15 mm 140 Gs
14.0 mT
 0.01 kg / 0.02 pounds
11.1 g / 0.1 N
 safe
20 mm 69 Gs
6.9 mT
 0.00 kg / 0.01 pounds
2.7 g / 0.0 N
 safe
30 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 safe
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Magnetic force decreases sharply per each millimeter of spacing. Remember that every additional insulation layer (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnets operate strongest in perfect adhesion; air break nullifies the force. Notice how rapidly the pull force plummet, when the product does not touch tightly to the metal substrate. When designing the mounting, eliminate unnecessary gaps.

Table 2: Sliding hold (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 pounds
506.0 g / 5.0 N
1 mm Stal (~0.2) 0.42 kg / 0.92 pounds
418.0 g / 4.1 N
2 mm Stal (~0.2) 0.32 kg / 0.70 pounds
316.0 g / 3.1 N
3 mm Stal (~0.2) 0.22 kg / 0.49 pounds
224.0 g / 2.2 N
5 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
10 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data indicates the approximate force sufficient to initiate the sliding of the magnet vertically along a vertical metal surface (considering standard friction coefficient). This parameter varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (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 pounds
759.0 g / 7.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.51 kg / 1.12 pounds
506.0 g / 5.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.25 kg / 0.56 pounds
253.0 g / 2.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.27 kg / 2.79 pounds
1265.0 g / 12.4 N
When mounting a holder on a vertical wall (e.g., a car body), it will only hold only approx. 20%-30% of its nominal power. Gravitational force and a low friction coefficient mean that products move down faster than they detach. Planning a vertical fastening? Remember that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will slip down under a significantly smaller weight. Application of an anti-slip coating can drastically improve the result.

Table 4: Steel thickness (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 pounds
253.0 g / 2.5 N
1 mm
25%
 0.63 kg / 1.39 pounds
632.5 g / 6.2 N
2 mm
50%
 1.27 kg / 2.79 pounds
1265.0 g / 12.4 N
3 mm
75%
 1.90 kg / 4.18 pounds
1897.5 g / 18.6 N
5 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
10 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
11 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
12 mm
100%
 2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
A thin sheet is not enough to take in the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a weak sheet, the flux will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you need a suitably thick backing of metal. The saturation effect means that on thin elements (e.g., car bodies), the holder works worse. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (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 pounds
2530.0 g / 24.8 N
 OK
40 °C -2.2% 2.47 kg / 5.45 pounds
2474.3 g / 24.3 N
 OK
60 °C -4.4% 2.42 kg / 5.33 pounds
2418.7 g / 23.7 N
80 °C -6.6% 2.36 kg / 5.21 pounds
2363.0 g / 23.2 N
100 °C -28.8% 1.80 kg / 3.97 pounds
1801.4 g / 17.7 N
Standard neodymium magnets irreversibly lose power above the temperature limit. Watch out for overheating – heat can permanently damage this product. With increasing heat, the neodymium's power briefly lowers. Refrain from using this product close to heaters exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.33 kg / 7.34 pounds
3 647 Gs
0.50 kg / 1.10 pounds
500 g / 4.9 N
 N/A
1 mm 3.07 kg / 6.76 pounds
4 070 Gs
0.46 kg / 1.01 pounds
460 g / 4.5 N
 2.76 kg / 6.09 pounds
~0 Gs
2 mm 2.75 kg / 6.07 pounds
3 855 Gs
0.41 kg / 0.91 pounds
413 g / 4.0 N
 2.48 kg / 5.46 pounds
~0 Gs
3 mm 2.42 kg / 5.33 pounds
3 612 Gs
0.36 kg / 0.80 pounds
362 g / 3.6 N
 2.17 kg / 4.79 pounds
~0 Gs
5 mm 1.76 kg / 3.88 pounds
3 084 Gs
0.26 kg / 0.58 pounds
264 g / 2.6 N
 1.59 kg / 3.50 pounds
~0 Gs
10 mm 0.66 kg / 1.45 pounds
1 886 Gs
0.10 kg / 0.22 pounds
99 g / 1.0 N
 0.59 kg / 1.31 pounds
~0 Gs
20 mm 0.08 kg / 0.18 pounds
671 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.17 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
77 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
47 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
31 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
21 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
15 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and steel combination. Such a system of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still significant.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Important: Figures show sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - 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
Mechanical watch 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
A strong magnetic field is a large risk to electronic devices as well as medical implants. These NdFeB products produce a flux that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, hard drives, 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
NdFeB products are very brittle – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the magnet. Use safety goggles when working with large magnets.

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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 14x8/4x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 101 Mx 31.0 µWb
Pc Coefficient 0.28 Low (Flat)
Flux value emitted by the pole surface. Key data when building generators as well as sensors. The Pc coefficient determines the working geometry.

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%
Corrosion warning: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

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

2. Steel saturation

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

3. Thermal stability

*For N38 material, the safety limit 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
Elemental analysis
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: 030181-2026
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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. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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 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.
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 (14 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø14x3 mm and a weight of 3.18 g. 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. 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.

Pros and cons of neodymium magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • By covering with a lustrous layer of nickel, the element has an elegant look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in designing and the ability to customize to complex applications,
  • Fundamental importance in future technologies – they serve a role in data components, electromotive mechanisms, precision medical tools, also other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

What to avoid - cons of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited possibility of creating threads in the magnet and complicated forms - preferred is a housing - mounting mechanism.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these devices can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

The lifting capacity listed is a result of laboratory testing performed under the following configuration:
  • using a plate made of low-carbon steel, functioning as a magnetic yoke
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an ground touching surface
  • with direct contact (no impurities)
  • during detachment in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force is determined by many variables, presented from crucial:
  • Clearance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Steel thickness – too thin sheet does not close the flux, causing part of the power to be escaped to the other side.
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Pacemakers

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Powerful field

Handle magnets with awareness. Their powerful strength can surprise even professionals. Plan your moves and respect their power.

Magnetic media

Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Magnets are brittle

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

GPS and phone interference

Be aware: neodymium magnets generate a field that interferes with sensitive sensors. Maintain a separation from your mobile, device, and GPS.

Allergy Warning

A percentage of the population have a contact allergy to Ni, which is the common plating for neodymium magnets. Extended handling can result in skin redness. We recommend wear protective gloves.

Dust is flammable

Fire warning: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Thermal limits

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Adults only

Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are tragic.

Crushing force

Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Danger! Looking for details? Read our article: Why are neodymium magnets dangerous?