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 ZŁ with VAT / pcs + price for transport
146.42 ZŁ net + 23% VAT / pcs
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Technical - MW 45x35 / N38 - cylindrical magnet
Specification / characteristics - MW 45x35 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010074 |
| GTIN/EAN | 5906301810735 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 |
|
2.30 kg / 5.07 pounds
2299.3 g / 22.6 N
|
| 1 mm |
|
5.75 kg / 12.67 pounds
5748.3 g / 56.4 N
|
| 2 mm |
|
11.50 kg / 25.35 pounds
11496.7 g / 112.8 N
|
| 3 mm |
|
17.25 kg / 38.02 pounds
17245.0 g / 169.2 N
|
| 5 mm |
|
28.74 kg / 63.36 pounds
28741.7 g / 282.0 N
|
| 10 mm |
|
57.48 kg / 126.73 pounds
57483.3 g / 563.9 N
|
| 11 mm |
|
63.23 kg / 139.40 pounds
63231.7 g / 620.3 N
|
| 12 mm |
|
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% |
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.
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 |
Other products
Pros and cons of Nd2Fe14B magnets.
Pros
- 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
- 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 force – what it depends on?
- 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
- 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.
