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MP 5x1.5x3 / N38 - ring magnet

ring magnet

Catalog no 030451

GTIN/EAN: 5906301812357

5.00

Diameter

5 mm [±0,1 mm]

internal diameter Ø

1.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

0.4 g

Magnetization Direction

↑ axial

Load capacity

0.77 kg / 7.50 N

Magnetic Induction

475.16 mT / 4752 Gs

Coating

[NiCuNi] Nickel

0.344 with VAT / pcs + price for transport

0.280 ZŁ net + 23% VAT / pcs

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Physical properties - MP 5x1.5x3 / N38 - ring magnet

Specification / characteristics - MP 5x1.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030451
GTIN/EAN 5906301812357
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 5 mm [±0,1 mm]
internal diameter Ø 1.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 0.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.77 kg / 7.50 N
Magnetic Induction ~ ? 475.16 mT / 4752 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 5x1.5x3 / 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 analysis of the product - data

The following information are the outcome of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Operational performance might slightly differ. Please consider these data as a reference point for designers.

Table 1: Static force (force vs distance) - interaction chart
MP 5x1.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6157 Gs
615.7 mT
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
weak grip
1 mm 3880 Gs
388.0 mT
0.31 kg / 0.67 pounds
305.8 g / 3.0 N
weak grip
2 mm 2310 Gs
231.0 mT
0.11 kg / 0.24 pounds
108.4 g / 1.1 N
weak grip
3 mm 1422 Gs
142.2 mT
0.04 kg / 0.09 pounds
41.0 g / 0.4 N
weak grip
5 mm 641 Gs
64.1 mT
0.01 kg / 0.02 pounds
8.3 g / 0.1 N
weak grip
10 mm 174 Gs
17.4 mT
0.00 kg / 0.00 pounds
0.6 g / 0.0 N
weak grip
15 mm 76 Gs
7.6 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
weak grip
20 mm 41 Gs
4.1 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip
30 mm 16 Gs
1.6 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip

Table 2: Sliding force (wall)
MP 5x1.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.15 kg / 0.34 pounds
154.0 g / 1.5 N
1 mm Stal (~0.2) 0.06 kg / 0.14 pounds
62.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 5x1.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.23 kg / 0.51 pounds
231.0 g / 2.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 0.34 pounds
154.0 g / 1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.17 pounds
77.0 g / 0.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.39 kg / 0.85 pounds
385.0 g / 3.8 N

Table 4: Material efficiency (saturation) - sheet metal selection
MP 5x1.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.08 kg / 0.17 pounds
77.0 g / 0.8 N
1 mm
25%
0.19 kg / 0.42 pounds
192.5 g / 1.9 N
2 mm
50%
0.39 kg / 0.85 pounds
385.0 g / 3.8 N
3 mm
75%
0.58 kg / 1.27 pounds
577.5 g / 5.7 N
5 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
10 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
11 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
12 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N

Table 5: Working in heat (material behavior) - thermal limit
MP 5x1.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.77 kg / 1.70 pounds
770.0 g / 7.6 N
OK
40 °C -2.2% 0.75 kg / 1.66 pounds
753.1 g / 7.4 N
OK
60 °C -4.4% 0.74 kg / 1.62 pounds
736.1 g / 7.2 N
OK
80 °C -6.6% 0.72 kg / 1.59 pounds
719.2 g / 7.1 N
100 °C -28.8% 0.55 kg / 1.21 pounds
548.2 g / 5.4 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 5x1.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.50 kg / 5.50 pounds
6 171 Gs
0.37 kg / 0.83 pounds
374 g / 3.7 N
N/A
1 mm 1.62 kg / 3.58 pounds
9 932 Gs
0.24 kg / 0.54 pounds
244 g / 2.4 N
1.46 kg / 3.22 pounds
~0 Gs
2 mm 0.99 kg / 2.19 pounds
7 760 Gs
0.15 kg / 0.33 pounds
149 g / 1.5 N
0.89 kg / 1.97 pounds
~0 Gs
3 mm 0.59 kg / 1.30 pounds
5 986 Gs
0.09 kg / 0.20 pounds
88 g / 0.9 N
0.53 kg / 1.17 pounds
~0 Gs
5 mm 0.21 kg / 0.47 pounds
3 600 Gs
0.03 kg / 0.07 pounds
32 g / 0.3 N
0.19 kg / 0.42 pounds
~0 Gs
10 mm 0.03 kg / 0.06 pounds
1 281 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
349 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
50 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
33 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
23 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
17 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
13 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
10 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Hazards (implants) - warnings
MP 5x1.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (cracking risk) - collision effects
MP 5x1.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 44.27 km/h
(12.30 m/s)
0.03 J
30 mm 76.64 km/h
(21.29 m/s)
0.09 J
50 mm 98.94 km/h
(27.48 m/s)
0.15 J
100 mm 139.93 km/h
(38.87 m/s)
0.30 J

Table 9: Coating parameters (durability)
MP 5x1.5x3 / 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 5x1.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 811 Mx 8.1 µWb
Pc Coefficient 1.66 High (Stable)

Table 11: Underwater work (magnet fishing)
MP 5x1.5x3 / N38

Environment Effective steel pull Effect
Air (land) 0.77 kg Standard
Water (riverbed) 0.88 kg
(+0.11 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

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

2. Plate thickness effect

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.66

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: 030451-2026
Measurement Calculator
Pulling force

Magnetic Field

Check out more proposals

The ring-shaped magnet MP 5x1.5x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. 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 5x1.5x3 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. 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.
A screw or bolt with a thread diameter smaller than 1.5 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. Always check that the screw head is not larger than the outer diameter of the magnet (5 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø5 mm (outer diameter) and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 0.77 kg (force ~7.50 N). The mounting hole diameter is precisely 1.5 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Strengths

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They retain attractive force for around ten years – the loss is just ~1% (based on simulations),
  • They retain their magnetic properties even under strong external field,
  • By using a smooth layer of silver, the element has an modern look,
  • Magnets possess extremely high magnetic induction on the outer layer,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Thanks to freedom in shaping and the capacity to modify to individual projects,
  • Significant place in high-tech industry – they serve a role in data components, drive modules, advanced medical instruments, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Limitations

Cons of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise 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 recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We suggest casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat contributes to it?

The declared magnet strength represents the limit force, recorded under ideal test conditions, meaning:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a plane perfectly flat
  • with direct contact (no impurities)
  • under vertical force vector (90-degree angle)
  • in stable room temperature

Key elements affecting lifting force

Bear in mind that the working load may be lower subject to the following factors, in order of importance:
  • Gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate decreases the holding force.

Warnings
Precision electronics

Be aware: neodymium magnets produce a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Do not give to children

Always store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

Respect the power

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Allergy Warning

Some people have a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Frequent touching can result in a rash. We strongly advise use safety gloves.

Permanent damage

Keep cool. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Magnet fragility

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Dust is flammable

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Electronic hazard

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Serious injuries

Pinching hazard: The attraction force is so great that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Life threat

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Security! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98