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MP 16x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030396

GTIN/EAN: 5906301812333

5.00

Diameter

16 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

4.24 g

Magnetization Direction

↑ axial

Load capacity

2.78 kg / 27.29 N

Magnetic Induction

217.61 mT / 2176 Gs

Coating

[NiCuNi] Nickel

technical specifications »

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Physical properties - MP 16x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 16x8/4x3 / N38 - ring magnet

properties
properties values
Cat. no. 030396
GTIN/EAN 5906301812333
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 8/4 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 4.24 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.78 kg / 27.29 N
Magnetic Induction ~ ? 217.61 mT / 2176 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 16x8/4x3 / 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 analysis of the assembly - report

Presented data represent the result of a engineering calculation. Values rely on models for the class Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - power drop
MP 16x8/4x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1882 Gs
188.2 mT
 2.78 kg / 6.13 pounds
2780.0 g / 27.3 N
 strong
1 mm 1746 Gs
174.6 mT
 2.39 kg / 5.27 pounds
2392.4 g / 23.5 N
 strong
2 mm 1561 Gs
156.1 mT
 1.91 kg / 4.22 pounds
1913.9 g / 18.8 N
 weak grip
3 mm 1357 Gs
135.7 mT
 1.45 kg / 3.19 pounds
1445.8 g / 14.2 N
 weak grip
5 mm 969 Gs
96.9 mT
 0.74 kg / 1.63 pounds
737.7 g / 7.2 N
 weak grip
10 mm 387 Gs
38.7 mT
 0.12 kg / 0.26 pounds
117.4 g / 1.2 N
 weak grip
15 mm 171 Gs
17.1 mT
 0.02 kg / 0.05 pounds
22.9 g / 0.2 N
 weak grip
20 mm 87 Gs
8.7 mT
 0.01 kg / 0.01 pounds
5.9 g / 0.1 N
 weak grip
30 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 pounds
0.7 g / 0.0 N
 weak grip
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Pulling power decreases significantly per each millimeter of gap. Remember that even a very thin break (e.g., contamination, paint, dust) strongly reduces the pull force. Neodymiums hold strongest at the point of direct contact; distance weakens the power. Observe how quickly the pull force plummet, when the product does not adhere directly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Shear load (wall)
MP 16x8/4x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.56 kg / 1.23 pounds
556.0 g / 5.5 N
1 mm Stal (~0.2) 0.48 kg / 1.05 pounds
478.0 g / 4.7 N
2 mm Stal (~0.2) 0.38 kg / 0.84 pounds
382.0 g / 3.7 N
3 mm Stal (~0.2) 0.29 kg / 0.64 pounds
290.0 g / 2.8 N
5 mm Stal (~0.2) 0.15 kg / 0.33 pounds
148.0 g / 1.5 N
10 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data defines the estimated weight limit needed to cause the slippage of the magnet downwards on a upright steel plate (assuming typical friction coefficient). The holding force depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 16x8/4x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.83 kg / 1.84 pounds
834.0 g / 8.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.56 kg / 1.23 pounds
556.0 g / 5.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.28 kg / 0.61 pounds
278.0 g / 2.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
When hanging a magnet on a upright wall (e.g., a fridge), it will maintain barely about 1/5 of its nominal power. Gravitational force and a low friction coefficient influence the fact that products slide down easier than they pull off. Planning a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slip down under a much lighter cargo. Utilizing a rubberized layer can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 16x8/4x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.28 kg / 0.61 pounds
278.0 g / 2.7 N
1 mm
25%
 0.70 kg / 1.53 pounds
695.0 g / 6.8 N
2 mm
50%
 1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
3 mm
75%
 2.09 kg / 4.60 pounds
2085.0 g / 20.5 N
5 mm
100%
 2.78 kg / 6.13 pounds
2780.0 g / 27.3 N
10 mm
100%
 2.78 kg / 6.13 pounds
2780.0 g / 27.3 N
11 mm
100%
 2.78 kg / 6.13 pounds
2780.0 g / 27.3 N
12 mm
100%
 2.78 kg / 6.13 pounds
2780.0 g / 27.3 N
A thin metal plate is incapable of take in the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation effect causes that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MP 16x8/4x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.78 kg / 6.13 pounds
2780.0 g / 27.3 N
 OK
40 °C -2.2% 2.72 kg / 5.99 pounds
2718.8 g / 26.7 N
 OK
60 °C -4.4% 2.66 kg / 5.86 pounds
2657.7 g / 26.1 N
80 °C -6.6% 2.60 kg / 5.72 pounds
2596.5 g / 25.5 N
100 °C -28.8% 1.98 kg / 4.36 pounds
1979.4 g / 19.4 N
Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently damage this magnet. With every degree above norm, the neodymium's force temporarily decreases. Do not use this magnet near heat sources exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 16x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.50 kg / 7.71 pounds
3 330 Gs
0.52 kg / 1.16 pounds
525 g / 5.1 N
 N/A
1 mm 3.28 kg / 7.23 pounds
3 644 Gs
0.49 kg / 1.08 pounds
492 g / 4.8 N
 2.95 kg / 6.51 pounds
~0 Gs
2 mm 3.01 kg / 6.64 pounds
3 492 Gs
0.45 kg / 1.00 pounds
452 g / 4.4 N
 2.71 kg / 5.97 pounds
~0 Gs
3 mm 2.71 kg / 5.98 pounds
3 316 Gs
0.41 kg / 0.90 pounds
407 g / 4.0 N
 2.44 kg / 5.39 pounds
~0 Gs
5 mm 2.11 kg / 4.64 pounds
2 920 Gs
0.32 kg / 0.70 pounds
316 g / 3.1 N
 1.90 kg / 4.18 pounds
~0 Gs
10 mm 0.93 kg / 2.05 pounds
1 939 Gs
0.14 kg / 0.31 pounds
139 g / 1.4 N
 0.84 kg / 1.84 pounds
~0 Gs
20 mm 0.15 kg / 0.33 pounds
773 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
98 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
60 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
40 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
27 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
20 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
14 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and sheet combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of performance. Designing a powerful holder? Apply two magnets instead of a neodymium and a steel. Remember that when bringing together two magnets, the collision energy is huge. The levitation is slightly lower than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Estimates apply to sliding force of a pair of identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - warnings
MP 16x8/4x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a serious hazard to electronic devices as well as pacemakers. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and housings. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MP 16x8/4x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.50 km/h
(7.36 m/s)
 0.11 J
30 mm 44.74 km/h
(12.43 m/s)
 0.33 J
50 mm 57.74 km/h
(16.04 m/s)
 0.55 J
100 mm 81.66 km/h
(22.68 m/s)
 1.09 J
Magnetic elements are delicate – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can cause material chips or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MP 16x8/4x3 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MP 16x8/4x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 743 Mx 37.4 µWb
Pc Coefficient 0.24 Low (Flat)
Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 16x8/4x3 / N38

Environment Effective steel pull Effect
Air (land) 2.78 kg Standard
Water (riverbed) 3.18 kg
(+0.40 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Steel saturation

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Power loss vs temp

*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) = 0.24

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 and environmental data
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: 030396-2026
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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. 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. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. 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 rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 8/4 mm fits this model. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø16x3 mm and a weight of 4.24 g. The pulling force of this model is an impressive 2.78 kg, which translates to 27.29 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 mm.
The poles are located on the planes with holes, not on the sides of the ring. 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.

Advantages and disadvantages of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their magnetic field remains stable, and after approximately ten years it drops only by ~1% (theoretically),
  • Magnets perfectly protect themselves against loss of magnetization caused by external fields,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise creating and optimizing to concrete requirements,
  • Versatile presence in modern industrial fields – they are commonly used in computer drives, brushless drives, medical equipment, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making threads in the magnet and complex shapes - recommended is a housing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these products can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Best holding force of the magnet in ideal parameters – what contributes to it?

Holding force of 2.78 kg is a theoretical maximum value conducted under specific, ideal conditions:
  • using a plate made of high-permeability steel, acting as a magnetic yoke
  • whose transverse dimension reaches at least 10 mm
  • with an polished contact surface
  • without any clearance between the magnet and steel
  • under vertical force vector (90-degree angle)
  • at ambient temperature room level

What influences lifting capacity in practice

During everyday use, the actual lifting capacity results from many variables, listed from crucial:
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Chemical composition of the base – mild steel attracts best. Alloy steels reduce magnetic permeability and holding force.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Handling rules

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

ICD Warning

Individuals with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can stop the operation of the life-saving device.

GPS and phone interference

Remember: neodymium magnets generate a field that disrupts precision electronics. Keep a separation from your phone, tablet, and GPS.

Bone fractures

Big blocks can smash fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Adults only

Adult use only. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep out of reach of kids and pets.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent direct skin contact and opt for encased magnets.

Permanent damage

Avoid heat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Protective goggles

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Machining danger

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

Protect data

Do not bring magnets near a wallet, computer, or screen. The magnetism can destroy these devices and wipe information from cards.

Attention! Need more info? Check our post: Why are neodymium magnets dangerous?