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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

product parameters »

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Detailed specification - 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

Technical analysis of the magnet - technical parameters

These values are the outcome of a physical calculation. Results rely on models for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
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
 medium risk
10 mm 2404 Gs
240.4 mT
 3.79 kg / 8.36 pounds
3791.3 g / 37.2 N
 medium risk
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
Magnetic force drops sharply with every subsequent millimeter of distance. Note that even the smallest gap (e.g., dirt, paint, dust) noticeably reduces the pull force. Magnets operate most effectively in perfect adhesion; distance weakens the force. See how quickly the load capacity fall, when the product does not touch directly to the steel surface. When calculating the arrangement, avoid additional spacers.

Table 2: Vertical force (vertical surface)
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
This section defines the estimated holding capacity required to start the sliding of the magnet down along a upright steel plate (assuming typical friction). This parameter is a function of 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 mounting a holder on a vertical plane (e.g., a board), it will only hold just about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that holders slip easier than they pop off the substrate. Designing a vertical fastening? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a significantly smaller load. Using a rubber pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 unable to absorb the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a too thin substrate, the flux will pass right through and the holding will be smaller. To achieve full efficiency of this magnet's power, you need a suitably thick backing of steel. The saturation effect means that on delicate walls (e.g., thin profiles), the holder works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (stability) - resistance threshold
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
Classic neodymiums irreversibly lose power past the thermal threshold. Protect against heat – excessive heat can permanently damage this product. With increasing heat, the neodymium's force temporarily decreases. Do not use this product close to ovens exceeding its working range. Ignoring the limit will cause destruction of magnetism.
*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 strong neodymiums attract each other from a significantly greater distance than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a larger range of action. Designing a strong closure? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*Flux density between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Results apply to shear force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - 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
Timepiece 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
Extremely neodym field is a real danger to IT equipment and pacemakers. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MP 30x6x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.55 km/h
(6.26 m/s)
 1.00 J
30 mm 35.40 km/h
(9.83 m/s)
 2.46 J
50 mm 45.52 km/h
(12.64 m/s)
 4.07 J
100 mm 64.34 km/h
(17.87 m/s)
 8.13 J
NdFeB products are delicate – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can cause material chips or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with large magnets.

Table 9: Surface protection spec
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction 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 magnet pole. Key data for generator designers and motors. The Pc coefficient determines 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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely reduces the holding force.

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.96

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.

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%
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: 030197-2026
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The ring magnet with a hole MP 30x6x10 / 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. This product with a force of 20.71 kg works great as a door latch, speaker holder, or mounting element in devices.
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. 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 easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. 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. Always check that the screw head is not larger than the outer diameter of the magnet (30 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø30 mm (outer diameter) and height 10 mm. 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.
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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of rare earth magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to magnetism drop when exposed to external magnetic sources,
  • Thanks to the elegant finish, the surface of nickel, gold, or silver-plated gives an professional appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to freedom in designing and the capacity to customize to specific needs,
  • Universal use in modern technologies – they find application in HDD drives, motor assemblies, medical devices, also other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices can disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what affects it?

Holding force of 20.71 kg is a measurement result conducted under specific, ideal conditions:
  • using a plate made of mild steel, functioning as a magnetic yoke
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • under perpendicular force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

During everyday use, the actual lifting capacity is determined by a number of factors, ranked from most significant:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Base massiveness – too thin sheet does not close the flux, causing part of the power to be wasted to the other side.
  • Plate material – mild steel gives the best results. Alloy steels decrease magnetic properties and holding force.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safe handling of NdFeB magnets
Nickel coating and allergies

Some people experience a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Frequent touching can result in a rash. We suggest wear safety gloves.

Bone fractures

Large magnets can break fingers instantly. Do not put your hand betwixt two attracting surfaces.

Mechanical processing

Fire warning: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Permanent damage

Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. This process is irreversible.

Material brittleness

Neodymium magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them cracking into small pieces.

Life threat

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Handling rules

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

No play value

Adult use only. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Phone sensors

Be aware: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Keep away from computers

Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Important! More info about hazards in the article: Magnet Safety Guide.