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MP 36.2x11/6x7.5 / N38 - ring magnet

ring magnet

Catalog no 030248

GTIN/EAN: 5906301812241

5.00

Diameter

36.2 mm [±0,1 mm]

internal diameter Ø

11/6 mm [±0,1 mm]

Height

7.5 mm [±0,1 mm]

Weight

56.3 g

Magnetization Direction

↑ axial

Load capacity

17.12 kg / 167.95 N

Magnetic Induction

237.29 mT / 2373 Gs

Coating

[NiCuNi] Nickel

technical parameters »

35.01 ZŁ with VAT / pcs + price for transport

28.46 ZŁ net + 23% VAT / pcs

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Parameters as well as form of a neodymium magnet can be checked using our power calculator.

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Technical of the product - MP 36.2x11/6x7.5 / N38 - ring magnet

Specification / characteristics - MP 36.2x11/6x7.5 / N38 - ring magnet

properties
properties values
Cat. no. 030248
GTIN/EAN 5906301812241
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 36.2 mm [±0,1 mm]
internal diameter Ø 11/6 mm [±0,1 mm]
Height 7.5 mm [±0,1 mm]
Weight 56.3 g
Magnetization Direction ↑ axial
Load capacity ~ ? 17.12 kg / 167.95 N
Magnetic Induction ~ ? 237.29 mT / 2373 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 36.2x11/6x7.5 / 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 modeling of the magnet - data

Presented data are the result of a mathematical calculation. Results were calculated on models for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Please consider these data as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MP 36.2x11/6x7.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2059 Gs
205.9 mT
 17.12 kg / 37.74 LBS
17120.0 g / 167.9 N
 critical level
1 mm 1997 Gs
199.7 mT
 16.11 kg / 35.52 LBS
16110.1 g / 158.0 N
 critical level
2 mm 1923 Gs
192.3 mT
 14.93 kg / 32.91 LBS
14925.7 g / 146.4 N
 critical level
3 mm 1838 Gs
183.8 mT
 13.64 kg / 30.06 LBS
13636.4 g / 133.8 N
 critical level
5 mm 1648 Gs
164.8 mT
 10.97 kg / 24.18 LBS
10968.0 g / 107.6 N
 critical level
10 mm 1161 Gs
116.1 mT
 5.44 kg / 12.00 LBS
5444.8 g / 53.4 N
 medium risk
15 mm 775 Gs
77.5 mT
 2.43 kg / 5.35 LBS
2427.5 g / 23.8 N
 medium risk
20 mm 515 Gs
51.5 mT
 1.07 kg / 2.36 LBS
1071.1 g / 10.5 N
 low risk
30 mm 242 Gs
24.2 mT
 0.24 kg / 0.52 LBS
236.8 g / 2.3 N
 low risk
50 mm 73 Gs
7.3 mT
 0.02 kg / 0.05 LBS
21.8 g / 0.2 N
 low risk
Pulling power weakens drastically with every mm of gap. Remember that even a very thin break (e.g., contamination, varnish, veneer) strongly weakens the grip. Magnets operate optimally in perfect adhesion; air break kills the force. See how rapidly the parameters drop, when the product does not touch flatly to the steel surface. When designing the mounting, discard unnecessary gaps.

Table 2: Vertical force (wall)
MP 36.2x11/6x7.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.42 kg / 7.55 LBS
3424.0 g / 33.6 N
1 mm Stal (~0.2) 3.22 kg / 7.10 LBS
3222.0 g / 31.6 N
2 mm Stal (~0.2) 2.99 kg / 6.58 LBS
2986.0 g / 29.3 N
3 mm Stal (~0.2) 2.73 kg / 6.01 LBS
2728.0 g / 26.8 N
5 mm Stal (~0.2) 2.19 kg / 4.84 LBS
2194.0 g / 21.5 N
10 mm Stal (~0.2) 1.09 kg / 2.40 LBS
1088.0 g / 10.7 N
15 mm Stal (~0.2) 0.49 kg / 1.07 LBS
486.0 g / 4.8 N
20 mm Stal (~0.2) 0.21 kg / 0.47 LBS
214.0 g / 2.1 N
30 mm Stal (~0.2) 0.05 kg / 0.11 LBS
48.0 g / 0.5 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The following data shows the approximate force necessary to initiate the sliding of the magnet vertically against a vertical steel wall (considering standard friction). This value depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 36.2x11/6x7.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.14 kg / 11.32 LBS
5136.0 g / 50.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.42 kg / 7.55 LBS
3424.0 g / 33.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.71 kg / 3.77 LBS
1712.0 g / 16.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.56 kg / 18.87 LBS
8560.0 g / 84.0 N
When placing a holder on a upright surface (e.g., a car body), it will maintain just about 1/5 of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that magnets slip faster than they pop off the substrate. Designing a vertical fastening? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will give way down under a much lighter cargo. Application of an anti-slip layer can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 36.2x11/6x7.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.86 kg / 1.89 LBS
856.0 g / 8.4 N
1 mm
13%
 2.14 kg / 4.72 LBS
2140.0 g / 21.0 N
2 mm
25%
 4.28 kg / 9.44 LBS
4280.0 g / 42.0 N
3 mm
38%
 6.42 kg / 14.15 LBS
6420.0 g / 63.0 N
5 mm
63%
 10.70 kg / 23.59 LBS
10700.0 g / 105.0 N
10 mm
100%
 17.12 kg / 37.74 LBS
17120.0 g / 167.9 N
11 mm
100%
 17.12 kg / 37.74 LBS
17120.0 g / 167.9 N
12 mm
100%
 17.12 kg / 37.74 LBS
17120.0 g / 167.9 N
A thin metal plate cannot take in the full magnetic flux, which squanders power of the magnet. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick element of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the product shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (stability) - power drop
MP 36.2x11/6x7.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 17.12 kg / 37.74 LBS
17120.0 g / 167.9 N
 OK
40 °C -2.2% 16.74 kg / 36.91 LBS
16743.4 g / 164.3 N
 OK
60 °C -4.4% 16.37 kg / 36.08 LBS
16366.7 g / 160.6 N
80 °C -6.6% 15.99 kg / 35.25 LBS
15990.1 g / 156.9 N
100 °C -28.8% 12.19 kg / 26.87 LBS
12189.4 g / 119.6 N
Classic neodymiums irreversibly lose strength above the temperature limit. Watch out for overheating – high temperature can irreversibly damage this magnet. With increasing heat, the magnet's force momentarily lowers. Do not use this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetic properties.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 36.2x11/6x7.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.24 kg / 49.03 LBS
3 569 Gs
3.34 kg / 7.35 LBS
3336 g / 32.7 N
 N/A
1 mm 21.62 kg / 47.67 LBS
4 061 Gs
3.24 kg / 7.15 LBS
3243 g / 31.8 N
 19.46 kg / 42.90 LBS
~0 Gs
2 mm 20.93 kg / 46.14 LBS
3 995 Gs
3.14 kg / 6.92 LBS
3139 g / 30.8 N
 18.84 kg / 41.52 LBS
~0 Gs
3 mm 20.18 kg / 44.49 LBS
3 923 Gs
3.03 kg / 6.67 LBS
3027 g / 29.7 N
 18.16 kg / 40.04 LBS
~0 Gs
5 mm 18.56 kg / 40.93 LBS
3 763 Gs
2.78 kg / 6.14 LBS
2785 g / 27.3 N
 16.71 kg / 36.83 LBS
~0 Gs
10 mm 14.25 kg / 31.41 LBS
3 296 Gs
2.14 kg / 4.71 LBS
2137 g / 21.0 N
 12.82 kg / 28.27 LBS
~0 Gs
20 mm 7.07 kg / 15.59 LBS
2 322 Gs
1.06 kg / 2.34 LBS
1061 g / 10.4 N
 6.37 kg / 14.03 LBS
~0 Gs
50 mm 0.64 kg / 1.40 LBS
697 Gs
0.10 kg / 0.21 LBS
96 g / 0.9 N
 0.57 kg / 1.26 LBS
~0 Gs
60 mm 0.31 kg / 0.68 LBS
484 Gs
0.05 kg / 0.10 LBS
46 g / 0.5 N
 0.28 kg / 0.61 LBS
~0 Gs
70 mm 0.16 kg / 0.35 LBS
346 Gs
0.02 kg / 0.05 LBS
24 g / 0.2 N
 0.14 kg / 0.31 LBS
~0 Gs
80 mm 0.08 kg / 0.19 LBS
254 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
90 mm 0.05 kg / 0.11 LBS
191 Gs
0.01 kg / 0.02 LBS
7 g / 0.1 N
 0.04 kg / 0.10 LBS
~0 Gs
100 mm 0.03 kg / 0.06 LBS
147 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.03 kg / 0.06 LBS
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal combination. Such a system of two magnets creates a more powerful interaction and a further horizon of action. Designing a strong closure? Apply two magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*The magnetic induction for N-N configuration reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Figures apply to sliding force of a pair of same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
MP 36.2x11/6x7.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Timepiece 20 Gs (2.0 mT) 8.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation is a real danger to IT equipment and medical implants. These NdFeB products produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MP 36.2x11/6x7.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.79 km/h
(5.78 m/s)
 0.94 J
30 mm 30.72 km/h
(8.53 m/s)
 2.05 J
50 mm 39.36 km/h
(10.93 m/s)
 3.36 J
100 mm 55.61 km/h
(15.45 m/s)
 6.72 J
Neodymium magnets are prone to chipping – a strong collision with metal can result in shattering. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (durability)
MP 36.2x11/6x7.5 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MP 36.2x11/6x7.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 038 Mx 210.4 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value emitted by the magnet pole. Key data for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Physics of underwater searching
MP 36.2x11/6x7.5 / N38

Environment Effective steel pull Effect
Air (land) 17.12 kg Standard
Water (riverbed) 19.60 kg
(+2.48 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Caution: On a vertical surface, the magnet holds just a fraction of its max power.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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 specification and ecology
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: 030248-2026
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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. This product with a force of 17.12 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 36.2x11/6x7.5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. 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 11/6 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 (36.2 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø36.2 mm (outer diameter) and height 7.5 mm. The key parameter here is the holding force amounting to approximately 17.12 kg (force ~167.95 N). The mounting hole diameter is precisely 11/6 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of neodymium magnets.

Advantages

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They do not lose power, even during nearly ten years – the drop in power is only ~1% (theoretically),
  • They have excellent resistance to magnetic field loss due to external magnetic sources,
  • By applying a decorative coating of silver, the element acquires an nice look,
  • Magnetic induction on the surface of the magnet is maximum,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in constructing and the capacity to customize to individual projects,
  • Versatile presence in future technologies – they serve a role in data components, brushless drives, advanced medical instruments, and technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets: application proposals
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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 extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what affects it?

The force parameter is a measurement result executed under standard conditions:
  • on a base made of mild steel, effectively closing the magnetic field
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an ground touching surface
  • under conditions of no distance (metal-to-metal)
  • under perpendicular force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

It is worth knowing that the working load may be lower depending on the following factors, starting with the most relevant:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
This is not a toy

Strictly keep magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are very dangerous.

Magnets are brittle

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Crushing force

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!

Powerful field

Use magnets with awareness. Their huge power can shock even experienced users. Plan your moves and do not underestimate their force.

Danger to pacemakers

People with a heart stimulator must maintain an large gap from magnets. The magnetic field can disrupt the operation of the implant.

Magnetic interference

Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.

Sensitization to coating

Studies show that nickel (the usual finish) is a common allergen. If your skin reacts to metals, prevent direct skin contact and select encased magnets.

Operating temperature

Avoid heat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Keep away from computers

Device Safety: Strong magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Mechanical processing

Machining of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Safety First! Want to know more? Check our post: Why are neodymium magnets dangerous?