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MW 45x35 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010074

GTIN/EAN: 5906301810735

Diameter Ø

45 mm [±0,1 mm]

Height

35 mm [±0,1 mm]

Weight

417.49 g

Magnetization Direction

↑ axial

Load capacity

68.98 kg / 676.73 N

Magnetic Induction

521.39 mT / 5214 Gs

Coating

[NiCuNi] Nickel

180.10 with VAT / pcs + price for transport

146.42 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical - MW 45x35 / N38 - cylindrical magnet

Specification / characteristics - MW 45x35 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010074
GTIN/EAN 5906301810735
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 Ø 45 mm [±0,1 mm]
Height 35 mm [±0,1 mm]
Weight 417.49 g
Magnetization Direction ↑ axial
Load capacity ~ ? 68.98 kg / 676.73 N
Magnetic Induction ~ ? 521.39 mT / 5214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x35 / N38 - cylindrical 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 analysis of the product - technical parameters

These values represent the result of a engineering calculation. Results are based on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 45x35 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5213 Gs
521.3 mT
68.98 kg / 152.07 pounds
68980.0 g / 676.7 N
dangerous!
1 mm 4982 Gs
498.2 mT
63.01 kg / 138.91 pounds
63010.2 g / 618.1 N
dangerous!
2 mm 4748 Gs
474.8 mT
57.23 kg / 126.18 pounds
57234.3 g / 561.5 N
dangerous!
3 mm 4516 Gs
451.6 mT
51.76 kg / 114.10 pounds
51756.9 g / 507.7 N
dangerous!
5 mm 4059 Gs
405.9 mT
41.82 kg / 92.19 pounds
41816.3 g / 410.2 N
dangerous!
10 mm 3027 Gs
302.7 mT
23.26 kg / 51.29 pounds
23264.1 g / 228.2 N
dangerous!
15 mm 2215 Gs
221.5 mT
12.45 kg / 27.45 pounds
12451.1 g / 122.1 N
dangerous!
20 mm 1619 Gs
161.9 mT
6.66 kg / 14.67 pounds
6656.2 g / 65.3 N
warning
30 mm 899 Gs
89.9 mT
2.05 kg / 4.52 pounds
2051.1 g / 20.1 N
warning
50 mm 340 Gs
34.0 mT
0.29 kg / 0.65 pounds
292.8 g / 2.9 N
safe

Table 2: Slippage force (vertical surface)
MW 45x35 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 13.80 kg / 30.41 pounds
13796.0 g / 135.3 N
1 mm Stal (~0.2) 12.60 kg / 27.78 pounds
12602.0 g / 123.6 N
2 mm Stal (~0.2) 11.45 kg / 25.23 pounds
11446.0 g / 112.3 N
3 mm Stal (~0.2) 10.35 kg / 22.82 pounds
10352.0 g / 101.6 N
5 mm Stal (~0.2) 8.36 kg / 18.44 pounds
8364.0 g / 82.1 N
10 mm Stal (~0.2) 4.65 kg / 10.26 pounds
4652.0 g / 45.6 N
15 mm Stal (~0.2) 2.49 kg / 5.49 pounds
2490.0 g / 24.4 N
20 mm Stal (~0.2) 1.33 kg / 2.94 pounds
1332.0 g / 13.1 N
30 mm Stal (~0.2) 0.41 kg / 0.90 pounds
410.0 g / 4.0 N
50 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 45x35 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
20.69 kg / 45.62 pounds
20694.0 g / 203.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.80 kg / 30.41 pounds
13796.0 g / 135.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.90 kg / 15.21 pounds
6898.0 g / 67.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
34.49 kg / 76.04 pounds
34490.0 g / 338.3 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 45x35 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
2.30 kg / 5.07 pounds
2299.3 g / 22.6 N
1 mm
8%
5.75 kg / 12.67 pounds
5748.3 g / 56.4 N
2 mm
17%
11.50 kg / 25.35 pounds
11496.7 g / 112.8 N
3 mm
25%
17.25 kg / 38.02 pounds
17245.0 g / 169.2 N
5 mm
42%
28.74 kg / 63.36 pounds
28741.7 g / 282.0 N
10 mm
83%
57.48 kg / 126.73 pounds
57483.3 g / 563.9 N
11 mm
92%
63.23 kg / 139.40 pounds
63231.7 g / 620.3 N
12 mm
100%
68.98 kg / 152.07 pounds
68980.0 g / 676.7 N

Table 5: Working in heat (material behavior) - thermal limit
MW 45x35 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 68.98 kg / 152.07 pounds
68980.0 g / 676.7 N
OK
40 °C -2.2% 67.46 kg / 148.73 pounds
67462.4 g / 661.8 N
OK
60 °C -4.4% 65.94 kg / 145.38 pounds
65944.9 g / 646.9 N
OK
80 °C -6.6% 64.43 kg / 142.04 pounds
64427.3 g / 632.0 N
100 °C -28.8% 49.11 kg / 108.28 pounds
49113.8 g / 481.8 N

Table 6: Two magnets (repulsion) - field collision
MW 45x35 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 266.45 kg / 587.43 pounds
5 900 Gs
39.97 kg / 88.11 pounds
39968 g / 392.1 N
N/A
1 mm 254.93 kg / 562.03 pounds
10 198 Gs
38.24 kg / 84.30 pounds
38240 g / 375.1 N
229.44 kg / 505.82 pounds
~0 Gs
2 mm 243.39 kg / 536.59 pounds
9 965 Gs
36.51 kg / 80.49 pounds
36509 g / 358.2 N
219.05 kg / 482.93 pounds
~0 Gs
3 mm 232.10 kg / 511.70 pounds
9 731 Gs
34.82 kg / 76.76 pounds
34816 g / 341.5 N
208.89 kg / 460.53 pounds
~0 Gs
5 mm 210.35 kg / 463.75 pounds
9 264 Gs
31.55 kg / 69.56 pounds
31553 g / 309.5 N
189.32 kg / 417.37 pounds
~0 Gs
10 mm 161.53 kg / 356.11 pounds
8 118 Gs
24.23 kg / 53.42 pounds
24229 g / 237.7 N
145.37 kg / 320.49 pounds
~0 Gs
20 mm 89.86 kg / 198.12 pounds
6 055 Gs
13.48 kg / 29.72 pounds
13480 g / 132.2 N
80.88 kg / 178.30 pounds
~0 Gs
50 mm 14.04 kg / 30.96 pounds
2 394 Gs
2.11 kg / 4.64 pounds
2107 g / 20.7 N
12.64 kg / 27.87 pounds
~0 Gs
60 mm 7.92 kg / 17.47 pounds
1 798 Gs
1.19 kg / 2.62 pounds
1188 g / 11.7 N
7.13 kg / 15.72 pounds
~0 Gs
70 mm 4.63 kg / 10.21 pounds
1 375 Gs
0.69 kg / 1.53 pounds
695 g / 6.8 N
4.17 kg / 9.19 pounds
~0 Gs
80 mm 2.80 kg / 6.18 pounds
1 070 Gs
0.42 kg / 0.93 pounds
421 g / 4.1 N
2.52 kg / 5.56 pounds
~0 Gs
90 mm 1.75 kg / 3.87 pounds
846 Gs
0.26 kg / 0.58 pounds
263 g / 2.6 N
1.58 kg / 3.48 pounds
~0 Gs
100 mm 1.13 kg / 2.49 pounds
679 Gs
0.17 kg / 0.37 pounds
170 g / 1.7 N
1.02 kg / 2.24 pounds
~0 Gs

Table 7: Hazards (electronics) - warnings
MW 45x35 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 26.5 cm
Hearing aid 10 Gs (1.0 mT) 20.5 cm
Mechanical watch 20 Gs (2.0 mT) 16.0 cm
Mobile device 40 Gs (4.0 mT) 12.5 cm
Car key 50 Gs (5.0 mT) 11.5 cm
Payment card 400 Gs (40.0 mT) 5.0 cm
HDD hard drive 600 Gs (60.0 mT) 4.0 cm

Table 8: Impact energy (kinetic energy) - warning
MW 45x35 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.46 km/h
(4.29 m/s)
3.85 J
30 mm 22.87 km/h
(6.35 m/s)
8.42 J
50 mm 29.06 km/h
(8.07 m/s)
13.61 J
100 mm 41.00 km/h
(11.39 m/s)
27.07 J

Table 9: Surface protection spec
MW 45x35 / 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 45x35 / N38

Parameter Value SI Unit / Description
Magnetic Flux 83 921 Mx 839.2 µWb
Pc Coefficient 0.78 High (Stable)

Table 11: Physics of underwater searching
MW 45x35 / N38

Environment Effective steel pull Effect
Air (land) 68.98 kg Standard
Water (riverbed) 78.98 kg
(+10.00 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

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

2. Steel thickness impact

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

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.78

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
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: 010074-2026
Quick Unit Converter
Force (pull)

Field Strength

Other products

The presented product is a very strong cylinder magnet, manufactured from durable NdFeB material, which, with dimensions of Ø45x35 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 68.98 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 676.73 N with a weight of only 417.49 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø45x35), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø45x35 mm, which, at a weight of 417.49 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 68.98 kg (force ~676.73 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 45 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They maintain their magnetic properties even under close interference source,
  • Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • Thanks to modularity in designing and the capacity to customize to individual projects,
  • Versatile presence in electronics industry – they are utilized in mass storage devices, electric drive systems, medical equipment, and technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also raises 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.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these products are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Holding force characteristics

Maximum magnetic pulling forcewhat it depends on?

The lifting capacity listed is a theoretical maximum value executed under specific, ideal conditions:
  • on a base made of mild steel, effectively closing the magnetic field
  • with a cross-section minimum 10 mm
  • characterized by smoothness
  • with total lack of distance (without paint)
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

What influences lifting capacity in practice

During everyday use, the real power is determined by many variables, listed from crucial:
  • Air gap (between the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be lost to the other side.
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.

H&S for magnets
Protect data

Do not bring magnets near a wallet, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Threat to navigation

GPS units and smartphones are extremely susceptible to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Bone fractures

Risk of injury: The pulling power is so immense that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Respect the power

Handle magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their power.

Material brittleness

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Dust explosion hazard

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Life threat

People with a heart stimulator must maintain an absolute distance from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Thermal limits

Avoid heat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Product not for children

Always store magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Skin irritation risks

Some people experience a sensitization to nickel, which is the common plating for neodymium magnets. Prolonged contact can result in an allergic reaction. We suggest use safety gloves.

Caution! Need more info? Read our article: Why are neodymium magnets dangerous?