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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

view technical specifications »

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Technical of the product - 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 modeling of the magnet - technical parameters

The following values constitute the direct effect of a engineering calculation. Results rely on algorithms for the material Nd2Fe14B. Real-world parameters may deviate from the simulation results. Please consider these calculations as a reference point when designing systems.

Table 1: Static pull force (force 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 LBS
2780.0 g / 27.3 N
 warning
1 mm 1746 Gs
174.6 mT
 2.39 kg / 5.27 LBS
2392.4 g / 23.5 N
 warning
2 mm 1561 Gs
156.1 mT
 1.91 kg / 4.22 LBS
1913.9 g / 18.8 N
 safe
3 mm 1357 Gs
135.7 mT
 1.45 kg / 3.19 LBS
1445.8 g / 14.2 N
 safe
5 mm 969 Gs
96.9 mT
 0.74 kg / 1.63 LBS
737.7 g / 7.2 N
 safe
10 mm 387 Gs
38.7 mT
 0.12 kg / 0.26 LBS
117.4 g / 1.2 N
 safe
15 mm 171 Gs
17.1 mT
 0.02 kg / 0.05 LBS
22.9 g / 0.2 N
 safe
20 mm 87 Gs
8.7 mT
 0.01 kg / 0.01 LBS
5.9 g / 0.1 N
 safe
30 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 LBS
0.7 g / 0.0 N
 safe
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Magnetic force drops drastically per each millimeter of distance. Keep in mind that even the smallest gap (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Magnetic products operate most effectively at the point of direct contact; distance weakens the power. See how flashily the parameters drop, when the magnet does not touch tightly to the metal substrate. When planning the arrangement, eliminate unnecessary gaps.

Table 2: Vertical 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 LBS
556.0 g / 5.5 N
1 mm Stal (~0.2) 0.48 kg / 1.05 LBS
478.0 g / 4.7 N
2 mm Stal (~0.2) 0.38 kg / 0.84 LBS
382.0 g / 3.7 N
3 mm Stal (~0.2) 0.29 kg / 0.64 LBS
290.0 g / 2.8 N
5 mm Stal (~0.2) 0.15 kg / 0.33 LBS
148.0 g / 1.5 N
10 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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
This section calculates the theoretical holding capacity necessary to initiate the shifting of the magnet vertically against a upright steel wall (considering standard friction). This value varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 LBS
834.0 g / 8.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.56 kg / 1.23 LBS
556.0 g / 5.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.28 kg / 0.61 LBS
278.0 g / 2.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.39 kg / 3.06 LBS
1390.0 g / 13.6 N
When hanging a element on a upright plane (e.g., a board), it you can count on barely approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip influence the fact that products slide down faster than they detach. Want to create a hanger? Consider that the sliding force is much weaker than the maximum static pull force. On a painted metal, the holder will slide down under a significantly smaller cargo. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MP 16x8/4x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.28 kg / 0.61 LBS
278.0 g / 2.7 N
1 mm
25%
 0.70 kg / 1.53 LBS
695.0 g / 6.8 N
2 mm
50%
 1.39 kg / 3.06 LBS
1390.0 g / 13.6 N
3 mm
75%
 2.09 kg / 4.60 LBS
2085.0 g / 20.5 N
5 mm
100%
 2.78 kg / 6.13 LBS
2780.0 g / 27.3 N
10 mm
100%
 2.78 kg / 6.13 LBS
2780.0 g / 27.3 N
11 mm
100%
 2.78 kg / 6.13 LBS
2780.0 g / 27.3 N
12 mm
100%
 2.78 kg / 6.13 LBS
2780.0 g / 27.3 N
A too thin steel is incapable of focus the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's potential, you need a suitably thick element of steel. The material oversaturation causes that on delicate walls (e.g., thin profiles), the holder holds weaker. We advise picking the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - resistance threshold
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 LBS
2780.0 g / 27.3 N
 OK
40 °C -2.2% 2.72 kg / 5.99 LBS
2718.8 g / 26.7 N
 OK
60 °C -4.4% 2.66 kg / 5.86 LBS
2657.7 g / 26.1 N
80 °C -6.6% 2.60 kg / 5.72 LBS
2596.5 g / 25.5 N
100 °C -28.8% 1.98 kg / 4.36 LBS
1979.4 g / 19.4 N
Standard neodymium magnets lose strength past the thermal threshold. Protect against heat – heat can irreversibly demagnetize this magnet. With every degree above norm, the neodymium's capacity briefly decreases. Do not use this product near heat sources higher than its working range. Ignoring the limit will result in permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 16x8/4x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.50 kg / 7.71 LBS
3 330 Gs
0.52 kg / 1.16 LBS
525 g / 5.1 N
 N/A
1 mm 3.28 kg / 7.23 LBS
3 644 Gs
0.49 kg / 1.08 LBS
492 g / 4.8 N
 2.95 kg / 6.51 LBS
~0 Gs
2 mm 3.01 kg / 6.64 LBS
3 492 Gs
0.45 kg / 1.00 LBS
452 g / 4.4 N
 2.71 kg / 5.97 LBS
~0 Gs
3 mm 2.71 kg / 5.98 LBS
3 316 Gs
0.41 kg / 0.90 LBS
407 g / 4.0 N
 2.44 kg / 5.39 LBS
~0 Gs
5 mm 2.11 kg / 4.64 LBS
2 920 Gs
0.32 kg / 0.70 LBS
316 g / 3.1 N
 1.90 kg / 4.18 LBS
~0 Gs
10 mm 0.93 kg / 2.05 LBS
1 939 Gs
0.14 kg / 0.31 LBS
139 g / 1.4 N
 0.84 kg / 1.84 LBS
~0 Gs
20 mm 0.15 kg / 0.33 LBS
773 Gs
0.02 kg / 0.05 LBS
22 g / 0.2 N
 0.13 kg / 0.29 LBS
~0 Gs
50 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
60 mm 0.00 kg / 0.00 LBS
60 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
40 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
27 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
20 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
14 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. The connection of two magnets produces a massive flux and a further horizon of action. Designing a powerful holder? Apply two magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the impact force is extreme. The repulsion force is slightly lower than the attraction, but still significant.
*Flux density for N-N configuration drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Figures apply to sliding force of dual matching magnets (friction ~0.15 for Ni-Ni coating).

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
Timepiece 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 is a real danger to electronics and medical implants. These neodymiums produce a flux that destroys function of digital equipment. Notice: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (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
NdFeB products are delicate – a violent impact against metal can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or injury to skin. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Corrosion resistance
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. 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)
Flux value passing through the pole surface. Key data for generator designers as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Note: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*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

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%
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: 030396-2026
Magnet Unit Converter
Magnet pull force
Magnetic Field
Type data in a box, and the rest will convert on the fly.

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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. Mounting is clean and reversible, unlike gluing. 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 rubber spacer 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.
It is a magnetic ring with a diameter of 16 mm and thickness 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.78 kg (force ~27.29 N). The mounting hole diameter is precisely 8/4 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths and weaknesses of rare earth magnets.

Advantages

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • They have constant strength, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
  • By applying a reflective coating of silver, the element has an modern look,
  • Magnets are distinguished by excellent magnetic induction on the outer layer,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of precise creating as well as modifying to specific conditions,
  • Universal use in electronics industry – they are used in HDD drives, brushless drives, medical devices, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Limitations

Cons of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what it depends on?

The specified lifting capacity concerns the limit force, recorded under ideal test conditions, meaning:
  • with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • with a cross-section of at least 10 mm
  • characterized by even structure
  • under conditions of ideal adhesion (metal-to-metal)
  • during pulling in a direction vertical to the mounting surface
  • in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Effective lifting capacity impacted by specific conditions, mainly (from priority):
  • Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Stainless steels may attract less.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
Conscious usage

Exercise caution. Rare earth magnets act from a distance and snap with huge force, often quicker than you can move away.

Medical implants

For implant holders: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Heat sensitivity

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Bone fractures

Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Safe distance

Powerful magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Allergic reactions

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, avoid direct skin contact or select versions in plastic housing.

GPS and phone interference

Note: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a separation from your mobile, device, and GPS.

Risk of cracking

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

Do not drill into magnets

Powder created during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Do not give to children

Strictly store magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.

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