Neodymiums – wide shape selection

Need reliable magnetic field? Our range includes rich assortment of disc, cylindrical and ring magnets. They are ideal for domestic applications, workshop and model making. Check our offer in stock.

discover magnet catalog

Magnets for underwater searches

Discover your passion with treasure salvaging! Our double-handle grips (F200, F400) provide safety guarantee and immense power. Stainless steel construction and strong lines will perform in any water.

choose your water magnet

Magnetic solutions for business

Professional solutions for mounting non-invasive. Threaded mounts (M8, M10, M12) provide instant organization of work on warehouses. Perfect for installing lighting, detectors and ads.

check industrial applications

📦 Fast shipping: buy by 14:00, package goes out today!

Dhit sp. z o.o.
Product available Ships today (order by 14:00)

MP 16x12x2 / N38 - ring magnet

ring magnet

Catalog no 030183

GTIN/EAN: 5906301812005

5.00

Diameter

16 mm [±0,1 mm]

internal diameter Ø

12 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

1.32 g

Magnetization Direction

↑ axial

Load capacity

0.68 kg / 6.62 N

Magnetic Induction

150.33 mT / 1503 Gs

Coating

[NiCuNi] Nickel

1.304 with VAT / pcs + price for transport

1.060 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
1.060 ZŁ
1.304 ZŁ
price from 600 pcs
0.996 ZŁ
1.226 ZŁ
price from 2400 pcs
0.933 ZŁ
1.147 ZŁ
Want to talk magnets?

Call us +48 888 99 98 98 otherwise contact us by means of contact form the contact form page.
Specifications and shape of a neodymium magnet can be calculated using our magnetic calculator.

Orders submitted before 14:00 will be dispatched today!

Technical parameters of the product - MP 16x12x2 / N38 - ring magnet

Specification / characteristics - MP 16x12x2 / N38 - ring magnet

properties
properties values
Cat. no. 030183
GTIN/EAN 5906301812005
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 16 mm [±0,1 mm]
internal diameter Ø 12 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 1.32 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.68 kg / 6.62 N
Magnetic Induction ~ ? 150.33 mT / 1503 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 16x12x2 / 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 simulation of the product - data

The following values are the outcome of a engineering simulation. Results are based on algorithms for the class Nd2Fe14B. Actual conditions may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - power drop
MP 16x12x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6011 Gs
601.1 mT
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
low risk
1 mm 5259 Gs
525.9 mT
0.52 kg / 1.15 LBS
520.7 g / 5.1 N
low risk
2 mm 4534 Gs
453.4 mT
0.39 kg / 0.85 LBS
387.0 g / 3.8 N
low risk
3 mm 3870 Gs
387.0 mT
0.28 kg / 0.62 LBS
281.9 g / 2.8 N
low risk
5 mm 2776 Gs
277.6 mT
0.15 kg / 0.32 LBS
145.1 g / 1.4 N
low risk
10 mm 1251 Gs
125.1 mT
0.03 kg / 0.06 LBS
29.4 g / 0.3 N
low risk
15 mm 643 Gs
64.3 mT
0.01 kg / 0.02 LBS
7.8 g / 0.1 N
low risk
20 mm 372 Gs
37.2 mT
0.00 kg / 0.01 LBS
2.6 g / 0.0 N
low risk
30 mm 159 Gs
15.9 mT
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
low risk
50 mm 49 Gs
4.9 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Sliding hold (wall)
MP 16x12x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.14 kg / 0.30 LBS
136.0 g / 1.3 N
1 mm Stal (~0.2) 0.10 kg / 0.23 LBS
104.0 g / 1.0 N
2 mm Stal (~0.2) 0.08 kg / 0.17 LBS
78.0 g / 0.8 N
3 mm Stal (~0.2) 0.06 kg / 0.12 LBS
56.0 g / 0.5 N
5 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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 16x12x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.20 kg / 0.45 LBS
204.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.14 kg / 0.30 LBS
136.0 g / 1.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.34 kg / 0.75 LBS
340.0 g / 3.3 N

Table 4: Steel thickness (substrate influence) - power losses
MP 16x12x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
1 mm
25%
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
2 mm
50%
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
3 mm
75%
0.51 kg / 1.12 LBS
510.0 g / 5.0 N
5 mm
100%
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
10 mm
100%
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
11 mm
100%
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
12 mm
100%
0.68 kg / 1.50 LBS
680.0 g / 6.7 N

Table 5: Working in heat (material behavior) - resistance threshold
MP 16x12x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.68 kg / 1.50 LBS
680.0 g / 6.7 N
OK
40 °C -2.2% 0.67 kg / 1.47 LBS
665.0 g / 6.5 N
OK
60 °C -4.4% 0.65 kg / 1.43 LBS
650.1 g / 6.4 N
OK
80 °C -6.6% 0.64 kg / 1.40 LBS
635.1 g / 6.2 N
100 °C -28.8% 0.48 kg / 1.07 LBS
484.2 g / 4.7 N

Table 6: Two magnets (attraction) - field collision
MP 16x12x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 37.47 kg / 82.60 LBS
6 145 Gs
5.62 kg / 12.39 LBS
5620 g / 55.1 N
N/A
1 mm 32.95 kg / 72.65 LBS
11 273 Gs
4.94 kg / 10.90 LBS
4943 g / 48.5 N
29.66 kg / 65.38 LBS
~0 Gs
2 mm 28.69 kg / 63.25 LBS
10 519 Gs
4.30 kg / 9.49 LBS
4303 g / 42.2 N
25.82 kg / 56.92 LBS
~0 Gs
3 mm 24.81 kg / 54.69 LBS
9 781 Gs
3.72 kg / 8.20 LBS
3721 g / 36.5 N
22.33 kg / 49.22 LBS
~0 Gs
5 mm 18.24 kg / 40.20 LBS
8 386 Gs
2.74 kg / 6.03 LBS
2735 g / 26.8 N
16.41 kg / 36.18 LBS
~0 Gs
10 mm 7.99 kg / 17.62 LBS
5 552 Gs
1.20 kg / 2.64 LBS
1199 g / 11.8 N
7.19 kg / 15.86 LBS
~0 Gs
20 mm 1.62 kg / 3.58 LBS
2 501 Gs
0.24 kg / 0.54 LBS
243 g / 2.4 N
1.46 kg / 3.22 LBS
~0 Gs
50 mm 0.06 kg / 0.13 LBS
471 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
0.05 kg / 0.11 LBS
~0 Gs
60 mm 0.03 kg / 0.06 LBS
318 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
0.02 kg / 0.05 LBS
~0 Gs
70 mm 0.01 kg / 0.03 LBS
225 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
0.01 kg / 0.03 LBS
~0 Gs
80 mm 0.01 kg / 0.02 LBS
166 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.01 LBS
126 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.01 LBS
98 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Protective zones (implants) - precautionary measures
MP 16x12x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Impact energy (cracking risk) - warning
MP 16x12x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.50 km/h
(6.53 m/s)
0.03 J
30 mm 39.66 km/h
(11.02 m/s)
0.08 J
50 mm 51.19 km/h
(14.22 m/s)
0.13 J
100 mm 72.39 km/h
(20.11 m/s)
0.27 J

Table 9: Coating parameters (durability)
MP 16x12x2 / 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 16x12x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 219 Mx 112.2 µWb
Pc Coefficient 1.22 High (Stable)

Table 11: Underwater work (magnet fishing)
MP 16x12x2 / N38

Environment Effective steel pull Effect
Air (land) 0.68 kg Standard
Water (riverbed) 0.78 kg
(+0.10 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds merely a fraction of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Heat tolerance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.22

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
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%
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: 030183-2026
Measurement Calculator
Pulling force

Field Strength

Check out more products

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. 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 16x12x2 / 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 too much pressure 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 is not sufficient for rain. 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 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.
It is a magnetic ring with a diameter of 16 mm and thickness 2 mm. The key parameter here is the holding force amounting to approximately 0.68 kg (force ~6.62 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 12 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of rare earth magnets.

Strengths

Besides their immense pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Neodymium magnets prove to be highly resistant to magnetic field loss caused by external magnetic fields,
  • In other words, due to the reflective finish of nickel, the element gains visual value,
  • Magnetic induction on the top side of the magnet is impressive,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to the potential of precise forming and customization to custom requirements, neodymium magnets can be modeled in a broad palette of geometric configurations, which makes them more universal,
  • Key role in electronics industry – they are utilized in HDD drives, electric drive systems, precision medical tools, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex forms in magnets, we propose using cover - 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. Furthermore, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat affects it?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:
  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • with a surface perfectly flat
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

What influences lifting capacity in practice

Please note that the working load will differ subject to elements below, starting with the most relevant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Handling guide

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Precision electronics

An intense magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and strength.

Danger to pacemakers

Individuals with a heart stimulator should maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Safe distance

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

No play value

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are tragic.

Fire warning

Fire hazard: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.

Hand protection

Large magnets can break fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.

Allergy Warning

A percentage of the population have a sensitization to nickel, which is the common plating for neodymium magnets. Frequent touching might lead to dermatitis. It is best to wear safety gloves.

Magnet fragility

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Caution! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98