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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

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35.01 ZŁ with VAT / pcs + price for transport

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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.

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Technical data - 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

Physical modeling of the assembly - technical parameters

The following values represent the direct effect of a mathematical analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world parameters may deviate from the simulation results. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (force 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
 crushing
1 mm 1997 Gs
199.7 mT
 16.11 kg / 35.52 LBS
16110.1 g / 158.0 N
 crushing
2 mm 1923 Gs
192.3 mT
 14.93 kg / 32.91 LBS
14925.7 g / 146.4 N
 crushing
3 mm 1838 Gs
183.8 mT
 13.64 kg / 30.06 LBS
13636.4 g / 133.8 N
 crushing
5 mm 1648 Gs
164.8 mT
 10.97 kg / 24.18 LBS
10968.0 g / 107.6 N
 crushing
10 mm 1161 Gs
116.1 mT
 5.44 kg / 12.00 LBS
5444.8 g / 53.4 N
 warning
15 mm 775 Gs
77.5 mT
 2.43 kg / 5.35 LBS
2427.5 g / 23.8 N
 warning
20 mm 515 Gs
51.5 mT
 1.07 kg / 2.36 LBS
1071.1 g / 10.5 N
 weak grip
30 mm 242 Gs
24.2 mT
 0.24 kg / 0.52 LBS
236.8 g / 2.3 N
 weak grip
50 mm 73 Gs
7.3 mT
 0.02 kg / 0.05 LBS
21.8 g / 0.2 N
 weak grip
Magnetic force weakens sharply with every subsequent millimeter of distance. Note that even a very thin break (e.g., dirt, varnish, veneer) strongly diminishes the holding power. Magnetic products operate most effectively at the point of direct contact; gap weakens the power. Observe how rapidly the pull force plummet, when the product does not adhere tightly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Slippage 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 table below defines the approximate weight limit required to cause the sliding of the magnet vertically against a vertical steel wall (considering typical friction coefficient). The holding force varies with the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - 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 mounting a holder on a vertical wall (e.g., a fridge), it you can count on only approx. 20%-30% of its maximum pull force. Gravity and a low friction coefficient influence the fact that magnets move down faster than they detach. Planning a wall mount? Remember that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter cargo. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
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 too thin steel is unable to take in the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon means that on thin elements (e.g., car bodies), the holder holds weaker. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal stability (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
Standard neodymium magnets irreversibly lose parameters past the thermal threshold. Avoid high temperatures – high temperature can irreversibly damage this product. With increasing heat, the magnet's power momentarily decreases. Avoid using this product close to heaters higher than its working range. Ignoring the limit will lead to destruction of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table points to permanent field degradation 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 Strength (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 magnets attract each other from a wider radius than a magnet and steel setup. Such a system of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Want to build a solid fastener? Apply two magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the impact force is extreme. The levitation is a bit weaker than the attraction, but still significant.
*Field value in repulsion mode drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Attention: Figures apply to sliding force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - 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
Remote 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
A strong magnetic field is a large risk to IT equipment as well as pacemakers. These magnets produce a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
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 delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

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)
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: 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 passing through the pole surface. Essential parameter when building generators and motors. Pc value determines the working geometry.

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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

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

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.26

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
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%
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: 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure 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. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø36.2x7.5 mm and a weight of 56.3 g. 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.
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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They retain attractive force for almost ten years – the drop is just ~1% (in theory),
  • Neodymium magnets are characterized by exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
  • Thanks to the smooth finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an professional appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact shaping and adapting to atypical applications,
  • Huge importance in modern industrial fields – they serve a role in computer drives, electric motors, medical equipment, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Characteristics of disadvantages of neodymium magnets: application proposals
  • They are prone to damage 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
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price is higher than average,

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

Breakaway force is the result of a measurement for optimal configuration, taking into account:
  • on a plate made of mild steel, effectively closing the magnetic field
  • whose thickness equals approx. 10 mm
  • with an ideally smooth contact surface
  • under conditions of no distance (metal-to-metal)
  • under perpendicular application of breakaway force (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

In real-world applications, the real power is determined by many variables, ranked from the most important:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – highest force is available only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Power loss in heat

Avoid heat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Magnets are brittle

Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them breaking into shards.

Keep away from electronics

A powerful magnetic field disrupts the operation of compasses in phones and navigation systems. Maintain magnets close to a device to prevent damaging the sensors.

Allergy Warning

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands or choose versions in plastic housing.

Cards and drives

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

This is not a toy

Strictly keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.

Crushing risk

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Pacemakers

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

Caution required

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Combustion hazard

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Caution! Looking for details? Check our post: Are neodymium magnets dangerous?