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MP 12x5x2 / N38 - ring magnet

ring magnet

Catalog no 030498

Diameter

12 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

1.4 g

Magnetization Direction

↑ axial

Load capacity

1.15 kg / 11.29 N

Magnetic Induction

195.97 mT / 1960 Gs

Coating

[NiCuNi] Nickel

1.230 with VAT / pcs + price for transport

1.000 ZŁ net + 23% VAT / pcs

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Technical of the product - MP 12x5x2 / N38 - ring magnet

Specification / characteristics - MP 12x5x2 / N38 - ring magnet

properties
properties values
Cat. no. 030498
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 12 mm [±0,1 mm]
internal diameter Ø 5 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 1.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.15 kg / 11.29 N
Magnetic Induction ~ ? 195.97 mT / 1960 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 12x5x2 / 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

Engineering simulation of the assembly - report

These values represent the direct effect of a engineering analysis. Results rely on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MP 12x5x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6085 Gs
608.5 mT
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
safe
1 mm 5082 Gs
508.2 mT
0.80 kg / 1.77 LBS
802.2 g / 7.9 N
safe
2 mm 4147 Gs
414.7 mT
0.53 kg / 1.18 LBS
534.0 g / 5.2 N
safe
3 mm 3340 Gs
334.0 mT
0.35 kg / 0.76 LBS
346.3 g / 3.4 N
safe
5 mm 2152 Gs
215.2 mT
0.14 kg / 0.32 LBS
143.8 g / 1.4 N
safe
10 mm 822 Gs
82.2 mT
0.02 kg / 0.05 LBS
21.0 g / 0.2 N
safe
15 mm 394 Gs
39.4 mT
0.00 kg / 0.01 LBS
4.8 g / 0.0 N
safe
20 mm 221 Gs
22.1 mT
0.00 kg / 0.00 LBS
1.5 g / 0.0 N
safe
30 mm 92 Gs
9.2 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
safe
50 mm 28 Gs
2.8 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Shear capacity (wall)
MP 12x5x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.23 kg / 0.51 LBS
230.0 g / 2.3 N
1 mm Stal (~0.2) 0.16 kg / 0.35 LBS
160.0 g / 1.6 N
2 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.07 kg / 0.15 LBS
70.0 g / 0.7 N
5 mm Stal (~0.2) 0.03 kg / 0.06 LBS
28.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MP 12x5x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.35 kg / 0.76 LBS
345.0 g / 3.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.23 kg / 0.51 LBS
230.0 g / 2.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.11 kg / 0.25 LBS
115.0 g / 1.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.58 kg / 1.27 LBS
575.0 g / 5.6 N

Table 4: Steel thickness (substrate influence) - power losses
MP 12x5x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.11 kg / 0.25 LBS
115.0 g / 1.1 N
1 mm
25%
0.29 kg / 0.63 LBS
287.5 g / 2.8 N
2 mm
50%
0.58 kg / 1.27 LBS
575.0 g / 5.6 N
3 mm
75%
0.86 kg / 1.90 LBS
862.5 g / 8.5 N
5 mm
100%
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
10 mm
100%
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
11 mm
100%
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
12 mm
100%
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N

Table 5: Thermal resistance (stability) - thermal limit
MP 12x5x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
OK
40 °C -2.2% 1.12 kg / 2.48 LBS
1124.7 g / 11.0 N
OK
60 °C -4.4% 1.10 kg / 2.42 LBS
1099.4 g / 10.8 N
OK
80 °C -6.6% 1.07 kg / 2.37 LBS
1074.1 g / 10.5 N
100 °C -28.8% 0.82 kg / 1.81 LBS
818.8 g / 8.0 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 12x5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.34 kg / 47.04 LBS
6 163 Gs
3.20 kg / 7.06 LBS
3201 g / 31.4 N
N/A
1 mm 17.97 kg / 39.61 LBS
11 168 Gs
2.69 kg / 5.94 LBS
2695 g / 26.4 N
16.17 kg / 35.65 LBS
~0 Gs
2 mm 14.88 kg / 32.81 LBS
10 165 Gs
2.23 kg / 4.92 LBS
2233 g / 21.9 N
13.40 kg / 29.53 LBS
~0 Gs
3 mm 12.20 kg / 26.89 LBS
9 202 Gs
1.83 kg / 4.03 LBS
1830 g / 17.9 N
10.98 kg / 24.20 LBS
~0 Gs
5 mm 8.00 kg / 17.63 LBS
7 450 Gs
1.20 kg / 2.64 LBS
1199 g / 11.8 N
7.20 kg / 15.87 LBS
~0 Gs
10 mm 2.67 kg / 5.88 LBS
4 304 Gs
0.40 kg / 0.88 LBS
400 g / 3.9 N
2.40 kg / 5.30 LBS
~0 Gs
20 mm 0.39 kg / 0.86 LBS
1 644 Gs
0.06 kg / 0.13 LBS
58 g / 0.6 N
0.35 kg / 0.77 LBS
~0 Gs
50 mm 0.01 kg / 0.02 LBS
275 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
0.01 kg / 0.02 LBS
~0 Gs
60 mm 0.00 kg / 0.01 LBS
184 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.01 LBS
129 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
95 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
72 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
56 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 12x5x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Timepiece 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - collision effects
MP 12x5x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.23 km/h
(8.12 m/s)
0.05 J
30 mm 50.07 km/h
(13.91 m/s)
0.14 J
50 mm 64.63 km/h
(17.95 m/s)
0.23 J
100 mm 91.40 km/h
(25.39 m/s)
0.45 J

Table 9: Surface protection spec
MP 12x5x2 / 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: Electrical data (Pc)
MP 12x5x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 503 Mx 65.0 µWb
Pc Coefficient 1.34 High (Stable)

Table 11: Underwater work (magnet fishing)
MP 12x5x2 / N38

Environment Effective steel pull Effect
Air (land) 1.15 kg Standard
Water (riverbed) 1.32 kg
(+0.17 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

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

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Heat tolerance

*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) = 1.34

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%
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: 030498-2026
Measurement Calculator
Magnet pull force

Field Strength

Check out also proposals

The ring magnet with a hole MP 12x5x2 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 1.15 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. 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 rubberized holders 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 Ø12x2 mm and a weight of 1.4 g. The key parameter here is the lifting capacity amounting to approximately 1.15 kg (force ~11.29 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 5 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose strength, even after around ten years – the decrease in lifting capacity is only ~1% (theoretically),
  • They maintain their magnetic properties even under external field action,
  • A magnet with a smooth gold surface looks better,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Thanks to modularity in forming and the ability to modify to individual projects,
  • Universal use in future technologies – they are utilized in mass storage devices, electric drive systems, medical devices, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves 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 power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex shapes in magnets, we propose using cover - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, taking into account:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • whose thickness reaches at least 10 mm
  • with an ground touching surface
  • under conditions of gap-free contact (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by specific conditions, including (from most important):
  • Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Safe handling of neodymium magnets
Bodily injuries

Large magnets can break fingers instantly. Never put your hand between two strong magnets.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact or opt for encased magnets.

Medical interference

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Operating temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Safe operation

Handle with care. Rare earth magnets act from a distance and connect with huge force, often quicker than you can react.

Risk of cracking

Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

GPS and phone interference

A strong magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Adults only

Always store magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.

Fire warning

Powder generated during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Keep away from computers

Do not bring magnets close to a wallet, computer, or screen. The magnetic field can destroy these devices and erase data from cards.

Danger! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98