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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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Physical properties - 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 - report

The following values are the result of a mathematical calculation. Results were calculated on models for the class Nd2Fe14B. Actual conditions may deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static force (force vs gap) - 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 LBS
20710.0 g / 203.2 N
 critical level
1 mm 5241 Gs
524.1 mT
 18.01 kg / 39.71 LBS
18011.7 g / 176.7 N
 critical level
2 mm 4861 Gs
486.1 mT
 15.50 kg / 34.17 LBS
15498.1 g / 152.0 N
 critical level
3 mm 4490 Gs
449.0 mT
 13.22 kg / 29.15 LBS
13223.5 g / 129.7 N
 critical level
5 mm 3792 Gs
379.2 mT
 9.43 kg / 20.79 LBS
9429.0 g / 92.5 N
 strong
10 mm 2404 Gs
240.4 mT
 3.79 kg / 8.36 LBS
3791.3 g / 37.2 N
 strong
15 mm 1526 Gs
152.6 mT
 1.53 kg / 3.37 LBS
1527.0 g / 15.0 N
 low risk
20 mm 1000 Gs
100.0 mT
 0.66 kg / 1.45 LBS
655.5 g / 6.4 N
 low risk
30 mm 482 Gs
48.2 mT
 0.15 kg / 0.34 LBS
152.6 g / 1.5 N
 low risk
50 mm 161 Gs
16.1 mT
 0.02 kg / 0.04 LBS
17.0 g / 0.2 N
 low risk
Magnetic force decreases significantly with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, dust) noticeably weakens the grip. Neodymiums work most effectively during direct contact; gap kills the force. See how flashily the parameters drop, when the product does not adhere flatly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Sliding hold (wall)
MP 30x6x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.14 kg / 9.13 LBS
4142.0 g / 40.6 N
1 mm Stal (~0.2) 3.60 kg / 7.94 LBS
3602.0 g / 35.3 N
2 mm Stal (~0.2) 3.10 kg / 6.83 LBS
3100.0 g / 30.4 N
3 mm Stal (~0.2) 2.64 kg / 5.83 LBS
2644.0 g / 25.9 N
5 mm Stal (~0.2) 1.89 kg / 4.16 LBS
1886.0 g / 18.5 N
10 mm Stal (~0.2) 0.76 kg / 1.67 LBS
758.0 g / 7.4 N
15 mm Stal (~0.2) 0.31 kg / 0.67 LBS
306.0 g / 3.0 N
20 mm Stal (~0.2) 0.13 kg / 0.29 LBS
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The following data indicates the approximate weight limit needed to initiate the sliding of the magnet vertically along a vertical steel wall (assuming typical friction). The holding force is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - 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 LBS
6213.0 g / 60.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.14 kg / 9.13 LBS
4142.0 g / 40.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.07 kg / 4.57 LBS
2071.0 g / 20.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.36 kg / 22.83 LBS
10355.0 g / 101.6 N
When placing a magnet on a upright surface (e.g., a car body), it you can count on only approx. 20%-30% of its nominal power. Gravity and a weak degree of grip cause that magnets slide down easier than they pop off the substrate. Designing a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the holder will slide down under a much lighter cargo. Utilizing a rubberized layer can drastically raise the stability.

Table 4: Steel thickness (saturation) - 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 LBS
1035.5 g / 10.2 N
1 mm
13%
 2.59 kg / 5.71 LBS
2588.8 g / 25.4 N
2 mm
25%
 5.18 kg / 11.41 LBS
5177.5 g / 50.8 N
3 mm
38%
 7.77 kg / 17.12 LBS
7766.3 g / 76.2 N
5 mm
63%
 12.94 kg / 28.54 LBS
12943.8 g / 127.0 N
10 mm
100%
 20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
11 mm
100%
 20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
12 mm
100%
 20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
A too thin steel cannot take in the full magnetic flux, which wastes potential of the magnet. Should you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick element of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - power drop
MP 30x6x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
 OK
40 °C -2.2% 20.25 kg / 44.65 LBS
20254.4 g / 198.7 N
 OK
60 °C -4.4% 19.80 kg / 43.65 LBS
19798.8 g / 194.2 N
 OK
80 °C -6.6% 19.34 kg / 42.64 LBS
19343.1 g / 189.8 N
100 °C -28.8% 14.75 kg / 32.51 LBS
14745.5 g / 144.7 N
Standard neodymium magnets lose parameters past the thermal threshold. Watch out for overheating – excessive heat can irreversibly destroy this magnet. With every degree above norm, the magnet's power briefly lowers. Avoid using this product close to ovens exceeding its working range. Exceeding the critical threshold will lead to destruction of magnetism.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
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 LBS
6 035 Gs
15.60 kg / 34.38 LBS
15596 g / 153.0 N
 N/A
1 mm 97.15 kg / 214.17 LBS
10 864 Gs
14.57 kg / 32.13 LBS
14572 g / 143.0 N
 87.43 kg / 192.75 LBS
~0 Gs
2 mm 90.42 kg / 199.35 LBS
10 481 Gs
13.56 kg / 29.90 LBS
13564 g / 133.1 N
 81.38 kg / 179.42 LBS
~0 Gs
3 mm 83.97 kg / 185.13 LBS
10 100 Gs
12.60 kg / 27.77 LBS
12596 g / 123.6 N
 75.57 kg / 166.61 LBS
~0 Gs
5 mm 71.94 kg / 158.60 LBS
9 349 Gs
10.79 kg / 23.79 LBS
10791 g / 105.9 N
 64.75 kg / 142.74 LBS
~0 Gs
10 mm 47.34 kg / 104.36 LBS
7 583 Gs
7.10 kg / 15.65 LBS
7100 g / 69.7 N
 42.60 kg / 93.92 LBS
~0 Gs
20 mm 19.03 kg / 41.96 LBS
4 809 Gs
2.86 kg / 6.29 LBS
2855 g / 28.0 N
 17.13 kg / 37.77 LBS
~0 Gs
50 mm 1.53 kg / 3.37 LBS
1 363 Gs
0.23 kg / 0.51 LBS
229 g / 2.2 N
 1.38 kg / 3.03 LBS
~0 Gs
60 mm 0.77 kg / 1.69 LBS
965 Gs
0.11 kg / 0.25 LBS
115 g / 1.1 N
 0.69 kg / 1.52 LBS
~0 Gs
70 mm 0.41 kg / 0.90 LBS
706 Gs
0.06 kg / 0.14 LBS
61 g / 0.6 N
 0.37 kg / 0.81 LBS
~0 Gs
80 mm 0.23 kg / 0.51 LBS
531 Gs
0.03 kg / 0.08 LBS
35 g / 0.3 N
 0.21 kg / 0.46 LBS
~0 Gs
90 mm 0.14 kg / 0.30 LBS
409 Gs
0.02 kg / 0.05 LBS
21 g / 0.2 N
 0.12 kg / 0.27 LBS
~0 Gs
100 mm 0.09 kg / 0.19 LBS
322 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
Two magnetic products attract each other from a much further distance than a magnet and steel setup. The setup of magnet-to-magnet produces a massive flux and a further horizon of operation. Want to build a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the attraction, but still large.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Results demonstrate friction force of two same 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
Timepiece 20 Gs (2.0 mT) 12.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Car key 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 serious hazard to IT equipment as well as pacemakers. These magnets generate a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and screens. 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 22.55 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
Magnetic elements are prone to chipping – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or injury to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Coating parameters (durability)
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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

Parameter Value SI Unit / Description
Magnetic Flux 31 585 Mx 315.8 µWb
Pc Coefficient 0.96 High (Stable)
Total magnetic flux passing through the magnet pole. Key data in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC 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) = 0.96

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.

Engineering data and GPSR
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%
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
Measurement Calculator
Force (pull)
Magnetic Induction
Input a figure in a single field to see the conversion for the other units right away.

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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. Mounting is clean and reversible, unlike gluing. 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 30x6x10 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. 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 6 mm fits this model. 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 (30 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 30 mm and thickness 10 mm. The key parameter here is the holding force amounting to approximately 20.71 kg (force ~203.16 N). 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of neodymium magnets.

Advantages

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets are distinguished by remarkably resistant to demagnetization caused by external field sources,
  • In other words, due to the metallic surface of gold, the element becomes visually attractive,
  • Magnetic induction on the top side of the magnet remains extremely intense,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual forming and optimizing to individual requirements,
  • Significant place in electronics industry – they are utilized in HDD drives, motor assemblies, precision medical tools, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making nuts in the magnet and complex forms - preferred is a housing - magnet mounting.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Highest magnetic holding force – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an ground contact surface
  • without any insulating layer between the magnet and steel
  • under axial force direction (90-degree angle)
  • at temperature room level

Practical lifting capacity: influencing factors

Holding efficiency is influenced by working environment parameters, mainly (from priority):
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material type – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the holding force.

H&S for magnets
Electronic devices

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

Phone sensors

Navigation devices and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Material brittleness

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Thermal limits

Do not overheat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Pacemakers

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Pinching danger

Watch your fingers. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Be careful!

Flammability

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Keep away from children

Neodymium magnets are not intended for children. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a severe health hazard and requires urgent medical intervention.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, cease handling magnets and wear gloves.

Caution required

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Important! Want to know more? Check our post: Are neodymium magnets dangerous?