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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

product parameters »

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Weight and appearance of a neodymium magnet can be verified using our modular calculator.

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Technical parameters - 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 are the result of a mathematical simulation. Values are based on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static pull force (pull vs distance) - characteristics
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
 warning
1 mm 1746 Gs
174.6 mT
 2.39 kg / 5.27 pounds
2392.4 g / 23.5 N
 warning
2 mm 1561 Gs
156.1 mT
 1.91 kg / 4.22 pounds
1913.9 g / 18.8 N
 low risk
3 mm 1357 Gs
135.7 mT
 1.45 kg / 3.19 pounds
1445.8 g / 14.2 N
 low risk
5 mm 969 Gs
96.9 mT
 0.74 kg / 1.63 pounds
737.7 g / 7.2 N
 low risk
10 mm 387 Gs
38.7 mT
 0.12 kg / 0.26 pounds
117.4 g / 1.2 N
 low risk
15 mm 171 Gs
17.1 mT
 0.02 kg / 0.05 pounds
22.9 g / 0.2 N
 low risk
20 mm 87 Gs
8.7 mT
 0.01 kg / 0.01 pounds
5.9 g / 0.1 N
 low risk
30 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 pounds
0.7 g / 0.0 N
 low risk
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Grip strength decreases significantly with every mm of distance. Keep in mind that even a microscopic distance (e.g., contamination, paint, dust) strongly weakens the grip. Magnets operate optimally in perfect adhesion; air break weakens the force. Analyze how flashily the pull force fall, when the product does not adhere tightly to the steel surface. When designing the assembly, discard additional spacers.

Table 2: Shear force (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 table below presents the estimated shear load needed to cause the downward movement of the magnet down on a vertical steel wall (considering typical friction). This value depends on the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 placing a element on a vertical surface (e.g., a board), it you can count on barely about 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient mean that holders slide down faster than they pull off. Want to create a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will give way down under a significantly smaller weight. Utilizing a rubberized layer can significantly improve the result.

Table 4: Material efficiency (saturation) - 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 absorb the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To utilize the maximum of this magnet's power, you require a sufficiently solid backing of metal. The material oversaturation means that on delicate walls (e.g., appliance housings), the product shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
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
Ordinary NdFeB products irreversibly lose strength past the thermal threshold. Protect against heat – excessive heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's capacity briefly drops. Avoid using this product in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will cause destruction of magnetism.
*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
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 attract each other from a much further distance than a magnet and sheet setup. The connection of two magnets produces a massive flux and a larger range of action. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the pinch force is massive. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Figures apply to friction force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - 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
Phone / Smartphone 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
A strong magnetic field poses a large risk to electronic devices as well as pacemakers. These neodymiums generate a flux that disrupts operation of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
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 very brittle – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or injury to fingers. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Anti-corrosion coating 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
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 passing through the pole surface. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
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!
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds just ~20% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.

3. Temperature resistance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.24

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 and environmental data
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%
Sustainability
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
Measurement Calculator
Force (pull)
Field Strength
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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 easy screwing 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. 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. 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.
The presented product is a ring magnet with dimensions Ø16 mm (outer diameter) and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.78 kg (force ~27.29 N). 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around 10 years it drops only by ~1% (according to research),
  • They possess excellent resistance to magnetic field loss as a result of external magnetic sources,
  • Thanks to the shimmering finish, the layer of nickel, gold, or silver gives an professional appearance,
  • Magnets possess exceptionally strong magnetic induction on the outer layer,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of detailed creating and optimizing to precise conditions,
  • Wide application in high-tech industry – they find application in computer drives, motor assemblies, medical equipment, also other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets are able to complicate diagnosis medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what affects it?

The specified lifting capacity refers to the peak performance, obtained under optimal environment, specifically:
  • on a block made of mild steel, effectively closing the magnetic flux
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature room level

Determinants of practical lifting force of a magnet

In practice, the actual lifting capacity depends on several key aspects, presented from crucial:
  • Clearance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Angle of force application – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Steel type – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Thermal environment – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Metal Allergy

A percentage of the population suffer from a contact allergy to Ni, which is the common plating for neodymium magnets. Extended handling might lead to a rash. We suggest wear protective gloves.

Compass and GPS

GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Maximum temperature

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Magnets are brittle

Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Bone fractures

Big blocks can break fingers in a fraction of a second. Do not place your hand between two strong magnets.

No play value

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

Conscious usage

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Plan your moves and respect their power.

Protect data

Data protection: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Life threat

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Important! Details about risks in the article: Magnet Safety Guide.