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MP 30x6x10 / N38 - ring magnet

ring magnet

Catalog no 030197

GTIN/EAN: 5906301812142

5.00

Diameter

30 mm [±0,1 mm]

internal diameter Ø

6 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

50.89 g

Magnetization Direction

↑ axial

Load capacity

20.71 kg / 203.16 N

Magnetic Induction

343.81 mT / 3438 Gs

Coating

[NiCuNi] Nickel

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
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Technical specification of the product - MP 30x6x10 / N38 - ring magnet

Specification / characteristics - MP 30x6x10 / N38 - ring magnet

properties
properties values
Cat. no. 030197
GTIN/EAN 5906301812142
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 30 mm [±0,1 mm]
internal diameter Ø 6 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 50.89 g
Magnetization Direction ↑ axial
Load capacity ~ ? 20.71 kg / 203.16 N
Magnetic Induction ~ ? 343.81 mT / 3438 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 30x6x10 / 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 information represent the outcome of a mathematical calculation. Values rely on models for the material Nd2Fe14B. Real-world performance might slightly differ. Treat these data as a supplementary guide for designers.

Table 1: Static force (pull vs gap) - power drop
MP 30x6x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5619 Gs
561.9 mT
 20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
 critical level
1 mm 5241 Gs
524.1 mT
 18.01 kg / 39.71 pounds
18011.7 g / 176.7 N
 critical level
2 mm 4861 Gs
486.1 mT
 15.50 kg / 34.17 pounds
15498.1 g / 152.0 N
 critical level
3 mm 4490 Gs
449.0 mT
 13.22 kg / 29.15 pounds
13223.5 g / 129.7 N
 critical level
5 mm 3792 Gs
379.2 mT
 9.43 kg / 20.79 pounds
9429.0 g / 92.5 N
 warning
10 mm 2404 Gs
240.4 mT
 3.79 kg / 8.36 pounds
3791.3 g / 37.2 N
 warning
15 mm 1526 Gs
152.6 mT
 1.53 kg / 3.37 pounds
1527.0 g / 15.0 N
 weak grip
20 mm 1000 Gs
100.0 mT
 0.66 kg / 1.45 pounds
655.5 g / 6.4 N
 weak grip
30 mm 482 Gs
48.2 mT
 0.15 kg / 0.34 pounds
152.6 g / 1.5 N
 weak grip
50 mm 161 Gs
16.1 mT
 0.02 kg / 0.04 pounds
17.0 g / 0.2 N
 weak grip
Grip strength drops significantly per each millimeter of distance. Keep in mind that even a very thin break (e.g., contamination, paint, veneer) strongly reduces the pull force. Neodymiums hold strongest in perfect adhesion; distance kills the force. See how rapidly the parameters fall, when the magnet does not adhere tightly to the steel surface. When planning the assembly, avoid unnecessary gaps.

Table 2: Vertical capacity (wall)
MP 30x6x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.14 kg / 9.13 pounds
4142.0 g / 40.6 N
1 mm Stal (~0.2) 3.60 kg / 7.94 pounds
3602.0 g / 35.3 N
2 mm Stal (~0.2) 3.10 kg / 6.83 pounds
3100.0 g / 30.4 N
3 mm Stal (~0.2) 2.64 kg / 5.83 pounds
2644.0 g / 25.9 N
5 mm Stal (~0.2) 1.89 kg / 4.16 pounds
1886.0 g / 18.5 N
10 mm Stal (~0.2) 0.76 kg / 1.67 pounds
758.0 g / 7.4 N
15 mm Stal (~0.2) 0.31 kg / 0.67 pounds
306.0 g / 3.0 N
20 mm Stal (~0.2) 0.13 kg / 0.29 pounds
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
The table below shows the estimated weight limit sufficient to initiate the sliding of the magnet downwards against a upright steel plate (assuming typical friction coefficient). This value varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 30x6x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.21 kg / 13.70 pounds
6213.0 g / 60.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.14 kg / 9.13 pounds
4142.0 g / 40.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.07 kg / 4.57 pounds
2071.0 g / 20.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.36 kg / 22.83 pounds
10355.0 g / 101.6 N
When hanging a element on a upright surface (e.g., a car body), it will maintain just approx. 1/5 of its nominal power. Gravity and a weak degree of grip cause that holders move down easier than they detach. Designing a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slide down under a noticeably lighter cargo. Application of an anti-slip layer can drastically increase the grip.

Table 4: Material efficiency (saturation) - power losses
MP 30x6x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.04 kg / 2.28 pounds
1035.5 g / 10.2 N
1 mm
13%
 2.59 kg / 5.71 pounds
2588.8 g / 25.4 N
2 mm
25%
 5.18 kg / 11.41 pounds
5177.5 g / 50.8 N
3 mm
38%
 7.77 kg / 17.12 pounds
7766.3 g / 76.2 N
5 mm
63%
 12.94 kg / 28.54 pounds
12943.8 g / 127.0 N
10 mm
100%
 20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
11 mm
100%
 20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
12 mm
100%
 20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
A too thin steel is not enough to conduct the entire magnetic field, which squanders power of the magnet. If you attach a powerful product to a thin surface, the flux will penetrate right through and the holding will be smaller. To achieve full efficiency of this neodymium's potential, you need a suitably thick element of metal. The saturation effect means that on thin elements (e.g., car bodies), the product shows lower pull force. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MP 30x6x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
 OK
40 °C -2.2% 20.25 kg / 44.65 pounds
20254.4 g / 198.7 N
 OK
60 °C -4.4% 19.80 kg / 43.65 pounds
19798.8 g / 194.2 N
 OK
80 °C -6.6% 19.34 kg / 42.64 pounds
19343.1 g / 189.8 N
100 °C -28.8% 14.75 kg / 32.51 pounds
14745.5 g / 144.7 N
Standard neodymium magnets lose power after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently demagnetize this product. With every degree above norm, the neodymium's capacity briefly drops. Avoid using this magnet close to ovens exceeding its safe range. Ignoring the limit will lead to destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MP 30x6x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 103.97 kg / 229.22 pounds
6 035 Gs
15.60 kg / 34.38 pounds
15596 g / 153.0 N
 N/A
1 mm 97.15 kg / 214.17 pounds
10 864 Gs
14.57 kg / 32.13 pounds
14572 g / 143.0 N
 87.43 kg / 192.75 pounds
~0 Gs
2 mm 90.42 kg / 199.35 pounds
10 481 Gs
13.56 kg / 29.90 pounds
13564 g / 133.1 N
 81.38 kg / 179.42 pounds
~0 Gs
3 mm 83.97 kg / 185.13 pounds
10 100 Gs
12.60 kg / 27.77 pounds
12596 g / 123.6 N
 75.57 kg / 166.61 pounds
~0 Gs
5 mm 71.94 kg / 158.60 pounds
9 349 Gs
10.79 kg / 23.79 pounds
10791 g / 105.9 N
 64.75 kg / 142.74 pounds
~0 Gs
10 mm 47.34 kg / 104.36 pounds
7 583 Gs
7.10 kg / 15.65 pounds
7100 g / 69.7 N
 42.60 kg / 93.92 pounds
~0 Gs
20 mm 19.03 kg / 41.96 pounds
4 809 Gs
2.86 kg / 6.29 pounds
2855 g / 28.0 N
 17.13 kg / 37.77 pounds
~0 Gs
50 mm 1.53 kg / 3.37 pounds
1 363 Gs
0.23 kg / 0.51 pounds
229 g / 2.2 N
 1.38 kg / 3.03 pounds
~0 Gs
60 mm 0.77 kg / 1.69 pounds
965 Gs
0.11 kg / 0.25 pounds
115 g / 1.1 N
 0.69 kg / 1.52 pounds
~0 Gs
70 mm 0.41 kg / 0.90 pounds
706 Gs
0.06 kg / 0.14 pounds
61 g / 0.6 N
 0.37 kg / 0.81 pounds
~0 Gs
80 mm 0.23 kg / 0.51 pounds
531 Gs
0.03 kg / 0.08 pounds
35 g / 0.3 N
 0.21 kg / 0.46 pounds
~0 Gs
90 mm 0.14 kg / 0.30 pounds
409 Gs
0.02 kg / 0.05 pounds
21 g / 0.2 N
 0.12 kg / 0.27 pounds
~0 Gs
100 mm 0.09 kg / 0.19 pounds
322 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.17 pounds
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and steel setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of operation. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the impact force is massive. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
Note: Calculations demonstrate friction force of dual same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MP 30x6x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.5 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Mechanical watch 20 Gs (2.0 mT) 12.0 cm
Mobile device 40 Gs (4.0 mT) 9.0 cm
Remote 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Powerful magnet radiation is a large risk to IT equipment as well as pacemakers. These magnets produce a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MP 30x6x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.80 km/h
(6.33 m/s)
 1.02 J
30 mm 24.98 km/h
(6.94 m/s)
 1.23 J
50 mm 25.10 km/h
(6.97 m/s)
 1.24 J
100 mm 25.12 km/h
(6.98 m/s)
 1.24 J
Magnetic elements are very brittle – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Corrosion resistance
MP 30x6x10 / 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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 30x6x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 31 585 Mx 315.8 µWb
Pc Coefficient 0.96 High (Stable)
Flux value emitted by the pole surface. Key data when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Physics of underwater searching
MP 30x6x10 / N38

Environment Effective steel pull Effect
Air (land) 20.71 kg Standard
Water (riverbed) 23.71 kg
(+3.00 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.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Note: 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) drastically weakens the holding force.

3. Power loss vs temp

*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) = 0.96

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

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%

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: 030197-2026
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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. 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 20.71 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 30x6x10 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. The flat screw head should evenly press the magnet. 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
A screw or bolt with a thread diameter smaller than 6 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.
This model is characterized by dimensions Ø30x10 mm and a weight of 50.89 g. The pulling force of this model is an impressive 20.71 kg, which translates to 203.16 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 6 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.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after approximately 10 years it drops only by ~1% (according to research),
  • Neodymium magnets remain highly resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a shiny silver surface has an effective appearance,
  • Magnetic induction on the top side of the magnet turns out to be exceptional,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of precise shaping and optimizing to complex applications,
  • Key role in modern technologies – they are used in data components, brushless drives, diagnostic systems, as well as other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 extremely resistant to heat
  • When exposed to humidity, magnets usually 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.
  • Due to limitations in realizing threads and complicated forms in magnets, we recommend using cover - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The declared magnet strength refers to the limit force, recorded under optimal environment, namely:
  • on a plate made of structural steel, effectively closing the magnetic field
  • whose thickness equals approx. 10 mm
  • characterized by lack of roughness
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Please note that the magnet holding may be lower subject to elements below, starting with the most relevant:
  • Distance – the presence of any layer (paint, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels lower magnetic permeability and holding force.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Protect data

Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Swallowing risk

These products are not toys. Swallowing several magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Conscious usage

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Health Danger

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Combustion hazard

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

Protective goggles

NdFeB magnets are ceramic materials, meaning they are very brittle. Impact of two magnets will cause them breaking into small pieces.

Demagnetization risk

Do not overheat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Bodily injuries

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

Sensitization to coating

A percentage of the population suffer from a sensitization to Ni, which is the common plating for neodymium magnets. Frequent touching may cause a rash. We strongly advise wear protective gloves.

Compass and GPS

A strong magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Do not bring magnets close to a smartphone to prevent damaging the sensors.

Important! Learn more about hazards in the article: Safety of working with magnets.