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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

35.01 with VAT / pcs + price for transport

28.46 ZŁ net + 23% VAT / pcs

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Technical details - 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 analysis of the product - technical parameters

Presented data are the direct effect of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
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
strong
15 mm 775 Gs
77.5 mT
2.43 kg / 5.35 lbs
2427.5 g / 23.8 N
strong
20 mm 515 Gs
51.5 mT
1.07 kg / 2.36 lbs
1071.1 g / 10.5 N
safe
30 mm 242 Gs
24.2 mT
0.24 kg / 0.52 lbs
236.8 g / 2.3 N
safe
50 mm 73 Gs
7.3 mT
0.02 kg / 0.05 lbs
21.8 g / 0.2 N
safe

Table 2: Shear capacity (vertical surface)
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

Table 3: Vertical assembly (shearing) - vertical pull
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

Table 4: Steel thickness (substrate influence) - 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

Table 5: Working in heat (material behavior) - resistance threshold
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

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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

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
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

Table 8: Impact energy (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

Table 9: Anti-corrosion coating 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)

Table 10: Construction data (Pc)
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)

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.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely ~20% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) significantly 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) = 0.26

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 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%
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
Quick Unit Converter
Pulling force

Magnetic Induction

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The ring-shaped magnet MP 36.2x11/6x7.5 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
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 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. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building 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. 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 pulling force of this model is an impressive 17.12 kg, which translates to 167.95 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after around ten years it decreases only by ~1% (theoretically),
  • They feature excellent resistance to magnetic field loss due to external fields,
  • Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • 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...
  • Considering the option of flexible forming and customization to custom needs, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
  • Wide application in high-tech industry – they are commonly used in computer drives, electric motors, medical equipment, also complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Detachment force of the magnet in optimal conditionswhat contributes to it?

The specified lifting capacity represents the limit force, obtained under ideal test conditions, namely:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface perfectly flat
  • without any air gap between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at standard ambient temperature

Key elements affecting lifting force

Effective lifting capacity is affected by working environment parameters, including (from most important):
  • Distance – existence of foreign body (paint, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Angle of force application – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped into the air.
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Warnings
Do not give to children

Always store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are tragic.

Fire risk

Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, immediately stop handling magnets and wear gloves.

Phone sensors

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

Physical harm

Danger of trauma: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Danger to pacemakers

Individuals with a pacemaker have to keep an safe separation from magnets. The magnetic field can stop the functioning of the implant.

Maximum temperature

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Fragile material

NdFeB magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them shattering into small pieces.

Safe operation

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Threat to electronics

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

Danger! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98