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MP 60x20x5 / N38 - ring magnet

ring magnet

Catalog no 030204

GTIN/EAN: 5906301812210

5.00

Diameter

60 mm [±0,1 mm]

internal diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

94.25 g

Magnetization Direction

↑ axial

Load capacity

9.41 kg / 92.27 N

Magnetic Induction

101.92 mT / 1019 Gs

Coating

[NiCuNi] Nickel

product parameters »

47.99 ZŁ with VAT / pcs + price for transport

39.02 ZŁ net + 23% VAT / pcs

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Product card - MP 60x20x5 / N38 - ring magnet

Specification / characteristics - MP 60x20x5 / N38 - ring magnet

properties
properties values
Cat. no. 030204
GTIN/EAN 5906301812210
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 60 mm [±0,1 mm]
internal diameter Ø 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 94.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.41 kg / 92.27 N
Magnetic Induction ~ ? 101.92 mT / 1019 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 60x20x5 / 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 - report

The following values constitute the result of a physical analysis. Results rely on models for the material Nd2Fe14B. Actual performance may differ. Use these calculations as a reference point for designers.

Table 1: Static pull force (force vs gap) - power drop
MP 60x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4541 Gs
454.1 mT
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
 strong
1 mm 4400 Gs
440.0 mT
 8.83 kg / 19.47 LBS
8832.4 g / 86.6 N
 strong
2 mm 4254 Gs
425.4 mT
 8.26 kg / 18.21 LBS
8258.2 g / 81.0 N
 strong
3 mm 4107 Gs
410.7 mT
 7.70 kg / 16.97 LBS
7697.5 g / 75.5 N
 strong
5 mm 3812 Gs
381.2 mT
 6.63 kg / 14.62 LBS
6630.0 g / 65.0 N
 strong
10 mm 3097 Gs
309.7 mT
 4.38 kg / 9.65 LBS
4375.1 g / 42.9 N
 strong
15 mm 2463 Gs
246.3 mT
 2.77 kg / 6.10 LBS
2767.8 g / 27.2 N
 strong
20 mm 1939 Gs
193.9 mT
 1.72 kg / 3.78 LBS
1715.2 g / 16.8 N
 weak grip
30 mm 1202 Gs
120.2 mT
 0.66 kg / 1.45 LBS
659.2 g / 6.5 N
 weak grip
50 mm 509 Gs
50.9 mT
 0.12 kg / 0.26 LBS
118.0 g / 1.2 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of gap. Note that even the smallest gap (e.g., contamination, paint, veneer) significantly reduces the pull force. Magnetic products work optimally in perfect adhesion; air break weakens the force. Analyze how flashily the pull force plummet, when the magnet does not touch tightly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Sliding capacity (vertical surface)
MP 60x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.88 kg / 4.15 LBS
1882.0 g / 18.5 N
1 mm Stal (~0.2) 1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
2 mm Stal (~0.2) 1.65 kg / 3.64 LBS
1652.0 g / 16.2 N
3 mm Stal (~0.2) 1.54 kg / 3.40 LBS
1540.0 g / 15.1 N
5 mm Stal (~0.2) 1.33 kg / 2.92 LBS
1326.0 g / 13.0 N
10 mm Stal (~0.2) 0.88 kg / 1.93 LBS
876.0 g / 8.6 N
15 mm Stal (~0.2) 0.55 kg / 1.22 LBS
554.0 g / 5.4 N
20 mm Stal (~0.2) 0.34 kg / 0.76 LBS
344.0 g / 3.4 N
30 mm Stal (~0.2) 0.13 kg / 0.29 LBS
132.0 g / 1.3 N
50 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
This section calculates the estimated force sufficient to start the shifting of the magnet vertically along a vertical metal surface (considering standard friction). The holding force is a function of the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MP 60x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.82 kg / 6.22 LBS
2823.0 g / 27.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.88 kg / 4.15 LBS
1882.0 g / 18.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.94 kg / 2.07 LBS
941.0 g / 9.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.71 kg / 10.37 LBS
4705.0 g / 46.2 N
When hanging a magnet on a vertical surface (e.g., a board), it will only hold just approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient mean that magnets move down faster than they pop off the substrate. Want to create a hanger? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slip down under a much lighter weight. Application of an anti-slip coating can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 60x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.94 kg / 2.07 LBS
941.0 g / 9.2 N
1 mm
25%
 2.35 kg / 5.19 LBS
2352.5 g / 23.1 N
2 mm
50%
 4.71 kg / 10.37 LBS
4705.0 g / 46.2 N
3 mm
75%
 7.06 kg / 15.56 LBS
7057.5 g / 69.2 N
5 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
10 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
11 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
12 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
A thin sheet is not enough to conduct the full magnetic flux, which squanders power of the holder. If you install a neodymium to a thin surface, the field will penetrate right through and the attraction force will be weaker. To achieve 100% of this neodymium's power, you require a sufficiently solid backing of steel. The material oversaturation means that on delicate walls (e.g., appliance housings), the magnet holds weaker. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MP 60x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
 OK
40 °C -2.2% 9.20 kg / 20.29 LBS
9203.0 g / 90.3 N
 OK
60 °C -4.4% 9.00 kg / 19.83 LBS
8996.0 g / 88.3 N
 OK
80 °C -6.6% 8.79 kg / 19.38 LBS
8788.9 g / 86.2 N
100 °C -28.8% 6.70 kg / 14.77 LBS
6699.9 g / 65.7 N
Standard neodymium magnets change their properties strength past the thermal threshold. Watch out for overheating – heat can permanently destroy this product. With every degree above norm, the magnet's power temporarily lowers. Avoid using this magnet in hot environments exceeding its working range. Exceeding the critical threshold will lead to irreversible degradation of magnetism.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MP 60x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 303.46 kg / 669.01 LBS
5 621 Gs
45.52 kg / 100.35 LBS
45519 g / 446.5 N
 N/A
1 mm 294.21 kg / 648.62 LBS
8 943 Gs
44.13 kg / 97.29 LBS
44132 g / 432.9 N
 264.79 kg / 583.76 LBS
~0 Gs
2 mm 284.83 kg / 627.94 LBS
8 800 Gs
42.72 kg / 94.19 LBS
42725 g / 419.1 N
 256.35 kg / 565.15 LBS
~0 Gs
3 mm 275.53 kg / 607.43 LBS
8 655 Gs
41.33 kg / 91.11 LBS
41329 g / 405.4 N
 247.97 kg / 546.69 LBS
~0 Gs
5 mm 257.21 kg / 567.06 LBS
8 362 Gs
38.58 kg / 85.06 LBS
38582 g / 378.5 N
 231.49 kg / 510.35 LBS
~0 Gs
10 mm 213.81 kg / 471.36 LBS
7 624 Gs
32.07 kg / 70.70 LBS
32071 g / 314.6 N
 192.43 kg / 424.23 LBS
~0 Gs
20 mm 141.09 kg / 311.05 LBS
6 193 Gs
21.16 kg / 46.66 LBS
21164 g / 207.6 N
 126.98 kg / 279.95 LBS
~0 Gs
50 mm 34.15 kg / 75.30 LBS
3 047 Gs
5.12 kg / 11.29 LBS
5123 g / 50.3 N
 30.74 kg / 67.77 LBS
~0 Gs
60 mm 21.26 kg / 46.87 LBS
2 404 Gs
3.19 kg / 7.03 LBS
3189 g / 31.3 N
 19.13 kg / 42.18 LBS
~0 Gs
70 mm 13.43 kg / 29.61 LBS
1 911 Gs
2.01 kg / 4.44 LBS
2015 g / 19.8 N
 12.09 kg / 26.65 LBS
~0 Gs
80 mm 8.65 kg / 19.06 LBS
1 533 Gs
1.30 kg / 2.86 LBS
1297 g / 12.7 N
 7.78 kg / 17.16 LBS
~0 Gs
90 mm 5.68 kg / 12.52 LBS
1 243 Gs
0.85 kg / 1.88 LBS
852 g / 8.4 N
 5.11 kg / 11.27 LBS
~0 Gs
100 mm 3.81 kg / 8.39 LBS
1 017 Gs
0.57 kg / 1.26 LBS
571 g / 5.6 N
 3.43 kg / 7.55 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal combination. Such a system of two magnets produces a massive flux and a wider radius of performance. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*Field value between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
* Estimates refer to friction force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 60x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 31.5 cm
Hearing aid 10 Gs (1.0 mT) 24.5 cm
Timepiece 20 Gs (2.0 mT) 19.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 15.0 cm
Car key 50 Gs (5.0 mT) 14.0 cm
Payment card 400 Gs (40.0 mT) 6.0 cm
HDD hard drive 600 Gs (60.0 mT) 5.0 cm
A strong magnetic field poses a serious hazard to IT equipment as well as medical implants. These magnets produce a flux that disrupts operation of sensitive medical devices. Notice: the unseen radiation penetrates the body and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MP 60x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 12.67 km/h
(3.52 m/s)
 0.58 J
30 mm 18.20 km/h
(5.06 m/s)
 1.20 J
50 mm 22.71 km/h
(6.31 m/s)
 1.88 J
100 mm 31.88 km/h
(8.85 m/s)
 3.70 J
NdFeB products are very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or painful pinches to skin. Be sure to control the product during installation so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
MP 60x20x5 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MP 60x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 109 640 Mx 1096.4 µWb
Pc Coefficient 0.62 High (Stable)
Flux value emitted by the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 60x20x5 / N38

Environment Effective steel pull Effect
Air (land) 9.41 kg Standard
Water (riverbed) 10.77 kg
(+1.36 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.62

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.

Engineering data and GPSR
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%
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: 030204-2026
Magnet Unit Converter
Pulling force
Field Strength
Input data into any field, to see the rest will convert automatically.

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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. This product with a force of 9.41 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 60x20x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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. 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 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 20 mm fits this model. 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.
This model is characterized by dimensions Ø60x5 mm and a weight of 94.25 g. The pulling force of this model is an impressive 9.41 kg, which translates to 92.27 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 20 mm.
The poles are located on the planes with holes, not on the sides of the ring. 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 as well as disadvantages of neodymium magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • Their strength remains stable, and after around ten years it decreases only by ~1% (theoretically),
  • They do not lose their magnetic properties even under strong external field,
  • By using a lustrous layer of gold, the element acquires an professional look,
  • Magnetic induction on the top side of the magnet turns out to be exceptional,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Considering the ability of flexible forming and adaptation to specialized projects, NdFeB magnets can be produced in a broad palette of shapes and sizes, which increases their versatility,
  • Key role in modern technologies – they are utilized in magnetic memories, brushless drives, advanced medical instruments, also industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: application proposals
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Limited possibility of producing threads in the magnet and complex shapes - preferred is cover - magnet mounting.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Maximum holding power of the magnet – what it depends on?

The load parameter shown refers to the peak performance, obtained under laboratory conditions, meaning:
  • using a sheet made of low-carbon steel, serving as a magnetic yoke
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an ground contact surface
  • without the slightest air gap between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Please note that the magnet holding will differ subject to elements below, in order of importance:
  • Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Life threat

Warning for patients: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Safe distance

Data protection: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Crushing force

Big blocks can smash fingers instantly. Never place your hand betwixt two attracting surfaces.

Material brittleness

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Power loss in heat

Keep cool. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

GPS Danger

GPS units and mobile phones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Powerful field

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Combustion hazard

Dust generated during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

No play value

Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Keep away from children and animals.

Avoid contact if allergic

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?