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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

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47.99 ZŁ with VAT / pcs + price for transport

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical - 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

Physical analysis of the assembly - data

The following values constitute the result of a mathematical simulation. Values were calculated on models for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Use these data as a reference point for designers.

Table 1: Static force (pull vs distance) - interaction chart
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
 medium risk
1 mm 4400 Gs
440.0 mT
 8.83 kg / 19.47 lbs
8832.4 g / 86.6 N
 medium risk
2 mm 4254 Gs
425.4 mT
 8.26 kg / 18.21 lbs
8258.2 g / 81.0 N
 medium risk
3 mm 4107 Gs
410.7 mT
 7.70 kg / 16.97 lbs
7697.5 g / 75.5 N
 medium risk
5 mm 3812 Gs
381.2 mT
 6.63 kg / 14.62 lbs
6630.0 g / 65.0 N
 medium risk
10 mm 3097 Gs
309.7 mT
 4.38 kg / 9.65 lbs
4375.1 g / 42.9 N
 medium risk
15 mm 2463 Gs
246.3 mT
 2.77 kg / 6.10 lbs
2767.8 g / 27.2 N
 medium risk
20 mm 1939 Gs
193.9 mT
 1.72 kg / 3.78 lbs
1715.2 g / 16.8 N
 low risk
30 mm 1202 Gs
120.2 mT
 0.66 kg / 1.45 lbs
659.2 g / 6.5 N
 low risk
50 mm 509 Gs
50.9 mT
 0.12 kg / 0.26 lbs
118.0 g / 1.2 N
 low risk
Magnetic force decreases drastically with every mm of distance. Keep in mind that even a very thin break (e.g., contamination, paint, veneer) strongly weakens the grip. Neodymiums operate most effectively in perfect adhesion; gap nullifies the power. Observe how quickly the pull force fall, when the magnet does not adhere flatly to the steel surface. When calculating the mounting, discard redundant distances.

Table 2: Shear capacity (wall)
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 shear load sufficient to start the sliding of the magnet downwards along a upright metal surface (considering typical friction coefficient). This parameter is relative to the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 placing a magnet on a vertical plane (e.g., a car body), it will maintain just approx. 20%-30% of nominal attraction strength. Gravitational force and a low friction coefficient mean that products move down easier than they pop off the substrate. Want to create a wall mount? Remember that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the element will slip down under a significantly smaller weight. Utilizing a rubberized layer can effectively increase the grip.

Table 4: Steel thickness (saturation) - 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 too thin steel is not enough to conduct the full magnetic flux, which weakens actual performance of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's power, you require a sufficiently solid element of steel. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
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
Classic neodymiums lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently damage this magnet. As the temperature rises, the magnet's force briefly lowers. Refrain from using this magnet close to heaters higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - 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 magnets attract each other from a significantly greater distance than a magnet and sheet setup. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*Flux density between like poles reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Attention: Results refer to sliding force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Mobile device 40 Gs (4.0 mT) 15.0 cm
Remote 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
Powerful magnet radiation is a serious hazard to IT equipment as well as pacemakers. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
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
Magnetic elements are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can cause material chips or injury 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 means shattering of the magnet. Wear eye protection 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
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 when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Caution: On a vertical wall, the magnet holds only approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

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

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.

Technical specification and ecology
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: 030204-2026
Magnet Unit Converter
Pulling force
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. 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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.
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 indoor 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. 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 (60 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø60 mm (outer diameter) and height 5 mm. The key parameter here is the holding force amounting to approximately 9.41 kg (force ~92.27 N). The mounting hole diameter is precisely 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths and weaknesses of rare earth magnets.

Strengths

Apart from their notable power, neodymium magnets have these key benefits:
  • They do not lose power, even over around 10 years – the reduction in lifting capacity is only ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • Thanks to the shiny finish, the coating of nickel, gold-plated, or silver-plated gives an professional appearance,
  • Magnets exhibit maximum magnetic induction on the active area,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the potential of precise molding and customization to unique projects, NdFeB magnets can be manufactured in a broad palette of shapes and sizes, which amplifies use scope,
  • Huge importance in modern industrial fields – they are commonly used in mass storage devices, electromotive mechanisms, diagnostic systems, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in compact constructions

Weaknesses

Characteristics of disadvantages of neodymium magnets: application proposals
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest 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 stable to moisture, in case of application outdoors
  • We suggest casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • at ambient temperature room level

Determinants of lifting force in real conditions

It is worth knowing that the magnet holding may be lower depending on the following factors, in order of importance:
  • Gap (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. Alloy additives weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
Maximum temperature

Keep cool. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Nickel allergy

A percentage of the population have a sensitization to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in a rash. We recommend use protective gloves.

Medical interference

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Conscious usage

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

Physical harm

Big blocks can crush fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Cards and drives

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.

Eye protection

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into shards.

Fire warning

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

This is not a toy

Product intended for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.

Phone sensors

A powerful magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.

Attention! Want to know more? Read our article: Are neodymium magnets dangerous?