MW 70x60 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010098
GTIN/EAN: 5906301810971
- Diameter Ø
- 70 mm [±0,1 mm]
- Height
- 60 mm [±0,1 mm]
- Weight
- 1731.8 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
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Need more?Frequently asked questions
Where can I buy strong cylindrical neodymium magnets?
Can a small cylindrical magnet provide a strong grip for precise workshop work?
Which cylindrical magnet can work at a higher temperature?
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 details - MW 70x60 / N38 - cylindrical magnet
Specification / characteristics - MW 70x60 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010098 |
| GTIN/EAN | 5906301810971 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 70 mm [±0,1 mm] |
| Height | 60 mm [±0,1 mm] |
| Weight | 1731.8 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 163.93 kg / 1608.16 N |
| Magnetic Induction ~ ? | 535.45 mT / 5354 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working temperature ? | ≤ 80 | °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 | 310 | °C |
| Curie Temperature TF | 590 | °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 product - technical parameters
Presented data constitute the result of a engineering simulation. Results were calculated on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Use these calculations as a reference point during assembly planning.
Table 1: Static force (force vs gap) - characteristics
MW 70x60 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5354 Gs
535.4 mT
|
163.93 kg / 361.40 pounds
163930.0 g / 1608.2 N
|
critical level |
| 1 mm |
5201 Gs
520.1 mT
|
154.68 kg / 341.01 pounds
154677.8 g / 1517.4 N
|
critical level |
| 2 mm |
5045 Gs
504.5 mT
|
145.58 kg / 320.96 pounds
145583.5 g / 1428.2 N
|
critical level |
| 3 mm |
4890 Gs
489.0 mT
|
136.77 kg / 301.52 pounds
136769.5 g / 1341.7 N
|
critical level |
| 5 mm |
4582 Gs
458.2 mT
|
120.07 kg / 264.72 pounds
120074.6 g / 1177.9 N
|
critical level |
| 10 mm |
3842 Gs
384.2 mT
|
84.43 kg / 186.13 pounds
84425.8 g / 828.2 N
|
critical level |
| 15 mm |
3176 Gs
317.6 mT
|
57.69 kg / 127.18 pounds
57688.8 g / 565.9 N
|
critical level |
| 20 mm |
2604 Gs
260.4 mT
|
38.78 kg / 85.50 pounds
38782.9 g / 380.5 N
|
critical level |
| 30 mm |
1744 Gs
174.4 mT
|
17.39 kg / 38.33 pounds
17385.0 g / 170.5 N
|
critical level |
| 50 mm |
829 Gs
82.9 mT
|
3.93 kg / 8.66 pounds
3929.4 g / 38.5 N
|
strong |
Table 2: Vertical load (wall)
MW 70x60 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Raw steel (µ ≈ 0.2) |
32.79 kg / 72.28 pounds
32786.0 g / 321.6 N
|
| 1 mm | Raw steel (µ ≈ 0.2) |
30.94 kg / 68.20 pounds
30936.0 g / 303.5 N
|
| 2 mm | Raw steel (µ ≈ 0.2) |
29.12 kg / 64.19 pounds
29116.0 g / 285.6 N
|
| 3 mm | Raw steel (µ ≈ 0.2) |
27.35 kg / 60.31 pounds
27354.0 g / 268.3 N
|
| 5 mm | Raw steel (µ ≈ 0.2) |
24.01 kg / 52.94 pounds
24014.0 g / 235.6 N
|
| 10 mm | Raw steel (µ ≈ 0.2) |
16.89 kg / 37.23 pounds
16886.0 g / 165.7 N
|
| 15 mm | Raw steel (µ ≈ 0.2) |
11.54 kg / 25.44 pounds
11538.0 g / 113.2 N
|
| 20 mm | Raw steel (µ ≈ 0.2) |
7.76 kg / 17.10 pounds
7756.0 g / 76.1 N
|
| 30 mm | Raw steel (µ ≈ 0.2) |
3.48 kg / 7.67 pounds
3478.0 g / 34.1 N
|
| 50 mm | Raw steel (µ ≈ 0.2) |
0.79 kg / 1.73 pounds
786.0 g / 7.7 N
|
Table 3: Vertical assembly (sliding) - vertical pull
MW 70x60 / N38
| Surface type | Friction coefficient / % | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% of nominal force
|
49.18 kg / 108.42 pounds
49179.0 g / 482.4 N
|
| Painted steel (standard) |
µ = 0.2
20% of nominal force
|
32.79 kg / 72.28 pounds
32786.0 g / 321.6 N
|
| Oily/slippery steel |
µ = 0.1
10% of nominal force
|
16.39 kg / 36.14 pounds
16393.0 g / 160.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% of nominal force
|
81.97 kg / 180.70 pounds
81965.0 g / 804.1 N
|
Table 4: Steel thickness (saturation) - power losses
MW 70x60 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
5.46 kg / 12.05 pounds
5464.3 g / 53.6 N
|
| 1 mm |
|
13.66 kg / 30.12 pounds
13660.8 g / 134.0 N
|
| 2 mm |
|
27.32 kg / 60.23 pounds
27321.7 g / 268.0 N
|
| 3 mm |
|
40.98 kg / 90.35 pounds
40982.5 g / 402.0 N
|
| 5 mm |
|
68.30 kg / 150.58 pounds
68304.2 g / 670.1 N
|
| 10 mm |
|
136.61 kg / 301.17 pounds
136608.3 g / 1340.1 N
|
| 11 mm |
|
150.27 kg / 331.29 pounds
150269.2 g / 1474.1 N
|
| 12 mm |
|
163.93 kg / 361.40 pounds
163930.0 g / 1608.2 N
|
Table 5: Thermal resistance (material behavior) - power drop
MW 70x60 / N38
| Magnet temperature (°C) | Force change relative to 20°C | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
163.93 kg / 361.40 pounds
163930.0 g / 1608.2 N
|
Estimate |
| 40 °C | -4.4% |
156.80 kg / 345.68 pounds
156796.4 g / 1538.2 N
|
Estimate |
| 60 °C | -8.6% |
149.82 kg / 330.30 pounds
149821.5 g / 1469.7 N
|
Estimate |
| 80 °C | -12.8% |
143.01 kg / 315.27 pounds
143005.3 g / 1402.9 N
|
Material limit |
| 100 °C | — | — | Out of range — no model |
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 70x60 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
680.08 kg / 1499.31 pounds
5 950 Gs
|
102.01 kg / 224.90 pounds
102012 g / 1000.7 N
|
N/A |
| 1 mm |
660.96 kg / 1457.16 pounds
10 556 Gs
|
99.14 kg / 218.57 pounds
99144 g / 972.6 N
|
594.86 kg / 1311.45 pounds
~0 Gs
|
| 2 mm |
641.69 kg / 1414.69 pounds
10 401 Gs
|
96.25 kg / 212.20 pounds
96254 g / 944.3 N
|
577.52 kg / 1273.22 pounds
~0 Gs
|
| 3 mm |
622.69 kg / 1372.80 pounds
10 246 Gs
|
93.40 kg / 205.92 pounds
93404 g / 916.3 N
|
560.42 kg / 1235.52 pounds
~0 Gs
|
| 5 mm |
585.53 kg / 1290.87 pounds
9 936 Gs
|
87.83 kg / 193.63 pounds
87830 g / 861.6 N
|
526.98 kg / 1161.79 pounds
~0 Gs
|
| 10 mm |
498.14 kg / 1098.21 pounds
9 164 Gs
|
74.72 kg / 164.73 pounds
74721 g / 733.0 N
|
448.33 kg / 988.39 pounds
~0 Gs
|
| 20 mm |
350.25 kg / 772.16 pounds
7 684 Gs
|
52.54 kg / 115.82 pounds
52537 g / 515.4 N
|
315.22 kg / 694.95 pounds
~0 Gs
|
| 50 mm |
107.57 kg / 237.16 pounds
4 259 Gs
|
16.14 kg / 35.57 pounds
16136 g / 158.3 N
|
96.82 kg / 213.44 pounds
~0 Gs
|
| 60 mm |
72.12 kg / 159.00 pounds
3 487 Gs
|
10.82 kg / 23.85 pounds
10818 g / 106.1 N
|
64.91 kg / 143.10 pounds
~0 Gs
|
| 70 mm |
48.77 kg / 107.51 pounds
2 867 Gs
|
7.31 kg / 16.13 pounds
7315 g / 71.8 N
|
43.89 kg / 96.76 pounds
~0 Gs
|
| 80 mm |
33.37 kg / 73.57 pounds
2 372 Gs
|
5.01 kg / 11.04 pounds
5005 g / 49.1 N
|
30.03 kg / 66.21 pounds
~0 Gs
|
| 90 mm |
23.15 kg / 51.04 pounds
1 976 Gs
|
3.47 kg / 7.66 pounds
3473 g / 34.1 N
|
20.84 kg / 45.94 pounds
~0 Gs
|
| 100 mm |
16.30 kg / 35.94 pounds
1 658 Gs
|
2.45 kg / 5.39 pounds
2445 g / 24.0 N
|
14.67 kg / 32.34 pounds
~0 Gs
|
Table 7: Axial field levels — not safety zones
MW 70x60 / N38
| Field level (Gs) | mT | Model distance (cm) |
|---|---|---|
| < 5 Gs | < 0.5 mT | 42.0 cm |
| < 10 Gs | < 1.0 mT | 33.0 cm |
| < 20 Gs | < 2.0 mT | 25.5 cm |
| < 40 Gs | < 4.0 mT | 19.5 cm |
| < 50 Gs | < 5.0 mT | 18.0 cm |
| < 400 Gs | < 40.0 mT | 7.5 cm |
| < 600 Gs | < 60.0 mT | 6.0 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 70x60 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
13.35 km/h
(3.71 m/s)
|
11.92 J | |
| 30 mm |
17.44 km/h
(4.84 m/s)
|
20.32 J | |
| 50 mm |
18.17 km/h
(5.05 m/s)
|
22.06 J | |
| 100 mm |
18.41 km/h
(5.12 m/s)
|
22.66 J |
Table 9: Anti-corrosion coating durability
MW 70x60 / 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: Electrical data (Pc)
MW 70x60 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 209 626 Mx | 2096.3 µWb |
| Pc Coefficient | 0.82 | High (Stable) |
Table 11: Physics of underwater searching
MW 70x60 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 163.93 kg | Standard |
| Water (riverbed) |
187.70 kg
(+23.77 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical surface, the magnet holds just ~20% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.
3. Thermal stability
N38: the maximum material working temperature is 80°C. Permitted conditions also depend on the shape and magnetic circuit.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.82
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.
Material specification
| 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 |
Other proposals
Pros and cons of Nd2Fe14B magnets.
Pros
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- They are noted for resistance to demagnetization induced by external field influence,
- By using a smooth coating of nickel, the element presents an nice look,
- Magnets have excellent magnetic induction on the active area,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of custom machining and optimizing to precise applications,
- Universal use in high-tech industry – they serve a role in data components, electromotive mechanisms, medical equipment, as well as multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Limitations
- At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We suggest cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex forms.
- Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
- With mass production the cost of neodymium magnets is a challenge,
Lifting parameters
Magnetic strength at its maximum – what it depends on?
- on a block made of mild steel, effectively closing the magnetic flux
- whose thickness equals approx. 10 mm
- characterized by lack of roughness
- with total lack of distance (no coatings)
- under vertical force direction (90-degree angle)
- in neutral thermal conditions
Determinants of lifting force in real conditions
- Gap (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Steel grade – ideal substrate is pure iron steel. Stainless steels may attract less.
- Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
- Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.
Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.
Safety rules for work with NdFeB magnets
Heat sensitivity
Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.
Magnetic interference
Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, device, and GPS.
Protect data
Data protection: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).
Sensitization to coating
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or choose coated magnets.
Safe operation
Use magnets consciously. Their powerful strength can shock even experienced users. Stay alert and respect their force.
ICD Warning
People with a heart stimulator must maintain an large gap from magnets. The magnetism can interfere with the functioning of the implant.
Hand protection
Pinching hazard: The attraction force is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Do not give to children
Neodymium magnets are not toys. Swallowing a few magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.
Eye protection
Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Dust explosion hazard
Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.
