MW 33x30 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010058
GTIN/EAN: 5906301810575
Diameter Ø
33 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
192.44 g
Magnetization Direction
↑ axial
Load capacity
35.84 kg / 351.54 N
Magnetic Induction
543.05 mT / 5430 Gs
Coating
[NiCuNi] Nickel
52.89 ZŁ with VAT / pcs + price for transport
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Physical properties - MW 33x30 / N38 - cylindrical magnet
Specification / characteristics - MW 33x30 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010058 |
| GTIN/EAN | 5906301810575 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 33 mm [±0,1 mm] |
| Height | 30 mm [±0,1 mm] |
| Weight | 192.44 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 35.84 kg / 351.54 N |
| Magnetic Induction ~ ? | 543.05 mT / 5430 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 |
Physical analysis of the product - report
The following information represent the result of a physical simulation. Results rely on models for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.
Table 1: Static force (pull vs gap) - interaction chart
MW 33x30 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5429 Gs
542.9 mT
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
dangerous! |
| 1 mm |
5098 Gs
509.8 mT
|
31.60 kg / 69.67 lbs
31600.1 g / 310.0 N
|
dangerous! |
| 2 mm |
4765 Gs
476.5 mT
|
27.60 kg / 60.85 lbs
27601.7 g / 270.8 N
|
dangerous! |
| 3 mm |
4436 Gs
443.6 mT
|
23.93 kg / 52.76 lbs
23930.4 g / 234.8 N
|
dangerous! |
| 5 mm |
3810 Gs
381.0 mT
|
17.65 kg / 38.91 lbs
17650.2 g / 173.1 N
|
dangerous! |
| 10 mm |
2518 Gs
251.8 mT
|
7.71 kg / 17.00 lbs
7709.5 g / 75.6 N
|
medium risk |
| 15 mm |
1650 Gs
165.0 mT
|
3.31 kg / 7.30 lbs
3312.1 g / 32.5 N
|
medium risk |
| 20 mm |
1105 Gs
110.5 mT
|
1.49 kg / 3.27 lbs
1485.1 g / 14.6 N
|
weak grip |
| 30 mm |
546 Gs
54.6 mT
|
0.36 kg / 0.80 lbs
361.9 g / 3.5 N
|
weak grip |
| 50 mm |
184 Gs
18.4 mT
|
0.04 kg / 0.09 lbs
41.4 g / 0.4 N
|
weak grip |
Table 2: Slippage load (vertical surface)
MW 33x30 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
7.17 kg / 15.80 lbs
7168.0 g / 70.3 N
|
| 1 mm | Stal (~0.2) |
6.32 kg / 13.93 lbs
6320.0 g / 62.0 N
|
| 2 mm | Stal (~0.2) |
5.52 kg / 12.17 lbs
5520.0 g / 54.2 N
|
| 3 mm | Stal (~0.2) |
4.79 kg / 10.55 lbs
4786.0 g / 47.0 N
|
| 5 mm | Stal (~0.2) |
3.53 kg / 7.78 lbs
3530.0 g / 34.6 N
|
| 10 mm | Stal (~0.2) |
1.54 kg / 3.40 lbs
1542.0 g / 15.1 N
|
| 15 mm | Stal (~0.2) |
0.66 kg / 1.46 lbs
662.0 g / 6.5 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 lbs
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.07 kg / 0.16 lbs
72.0 g / 0.7 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MW 33x30 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
10.75 kg / 23.70 lbs
10752.0 g / 105.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
7.17 kg / 15.80 lbs
7168.0 g / 70.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.58 kg / 7.90 lbs
3584.0 g / 35.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
17.92 kg / 39.51 lbs
17920.0 g / 175.8 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 33x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.79 kg / 3.95 lbs
1792.0 g / 17.6 N
|
| 1 mm |
|
4.48 kg / 9.88 lbs
4480.0 g / 43.9 N
|
| 2 mm |
|
8.96 kg / 19.75 lbs
8960.0 g / 87.9 N
|
| 3 mm |
|
13.44 kg / 29.63 lbs
13440.0 g / 131.8 N
|
| 5 mm |
|
22.40 kg / 49.38 lbs
22400.0 g / 219.7 N
|
| 10 mm |
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
| 11 mm |
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
| 12 mm |
|
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
Table 5: Working in heat (material behavior) - power drop
MW 33x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
35.84 kg / 79.01 lbs
35840.0 g / 351.6 N
|
OK |
| 40 °C | -2.2% |
35.05 kg / 77.28 lbs
35051.5 g / 343.9 N
|
OK |
| 60 °C | -4.4% |
34.26 kg / 75.54 lbs
34263.0 g / 336.1 N
|
OK |
| 80 °C | -6.6% |
33.47 kg / 73.80 lbs
33474.6 g / 328.4 N
|
|
| 100 °C | -28.8% |
25.52 kg / 56.26 lbs
25518.1 g / 250.3 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MW 33x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
155.43 kg / 342.66 lbs
5 974 Gs
|
23.31 kg / 51.40 lbs
23314 g / 228.7 N
|
N/A |
| 1 mm |
146.19 kg / 322.29 lbs
10 531 Gs
|
21.93 kg / 48.34 lbs
21928 g / 215.1 N
|
131.57 kg / 290.06 lbs
~0 Gs
|
| 2 mm |
137.04 kg / 302.12 lbs
10 196 Gs
|
20.56 kg / 45.32 lbs
20556 g / 201.7 N
|
123.34 kg / 271.91 lbs
~0 Gs
|
| 3 mm |
128.20 kg / 282.64 lbs
9 862 Gs
|
19.23 kg / 42.40 lbs
19230 g / 188.6 N
|
115.38 kg / 254.37 lbs
~0 Gs
|
| 5 mm |
111.55 kg / 245.93 lbs
9 199 Gs
|
16.73 kg / 36.89 lbs
16733 g / 164.2 N
|
100.40 kg / 221.34 lbs
~0 Gs
|
| 10 mm |
76.54 kg / 168.75 lbs
7 620 Gs
|
11.48 kg / 25.31 lbs
11481 g / 112.6 N
|
68.89 kg / 151.87 lbs
~0 Gs
|
| 20 mm |
33.43 kg / 73.71 lbs
5 036 Gs
|
5.02 kg / 11.06 lbs
5015 g / 49.2 N
|
30.09 kg / 66.34 lbs
~0 Gs
|
| 50 mm |
3.08 kg / 6.78 lbs
1 528 Gs
|
0.46 kg / 1.02 lbs
462 g / 4.5 N
|
2.77 kg / 6.11 lbs
~0 Gs
|
| 60 mm |
1.57 kg / 3.46 lbs
1 091 Gs
|
0.24 kg / 0.52 lbs
235 g / 2.3 N
|
1.41 kg / 3.11 lbs
~0 Gs
|
| 70 mm |
0.85 kg / 1.87 lbs
803 Gs
|
0.13 kg / 0.28 lbs
127 g / 1.2 N
|
0.76 kg / 1.69 lbs
~0 Gs
|
| 80 mm |
0.48 kg / 1.07 lbs
606 Gs
|
0.07 kg / 0.16 lbs
73 g / 0.7 N
|
0.44 kg / 0.96 lbs
~0 Gs
|
| 90 mm |
0.29 kg / 0.64 lbs
468 Gs
|
0.04 kg / 0.10 lbs
43 g / 0.4 N
|
0.26 kg / 0.57 lbs
~0 Gs
|
| 100 mm |
0.18 kg / 0.40 lbs
369 Gs
|
0.03 kg / 0.06 lbs
27 g / 0.3 N
|
0.16 kg / 0.36 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MW 33x30 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 20.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 16.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 12.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 9.5 cm |
| Remote | 50 Gs (5.0 mT) | 9.0 cm |
| Payment card | 400 Gs (40.0 mT) | 4.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 33x30 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
15.50 km/h
(4.31 m/s)
|
1.78 J | |
| 30 mm |
23.99 km/h
(6.66 m/s)
|
4.27 J | |
| 50 mm |
30.80 km/h
(8.55 m/s)
|
7.04 J | |
| 100 mm |
43.52 km/h
(12.09 m/s)
|
14.06 J |
Table 9: Anti-corrosion coating durability
MW 33x30 / 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: Construction data (Pc)
MW 33x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 47 447 Mx | 474.5 µWb |
| Pc Coefficient | 0.85 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 33x30 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 35.84 kg | Standard |
| Water (riverbed) |
41.04 kg
(+5.20 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.85
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages as well as disadvantages of rare earth magnets.
Benefits
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
- Magnets effectively resist against demagnetization caused by foreign field sources,
- The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- They feature high magnetic induction at the operating surface, which affects their effectiveness,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to versatility in designing and the capacity to adapt to specific needs,
- Universal use in electronics industry – they are used in magnetic memories, electromotive mechanisms, medical devices, also multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in miniature devices
Disadvantages
- At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We recommend casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex shapes.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical after entering the body.
- With mass production the cost of neodymium magnets is economically unviable,
Lifting parameters
Maximum magnetic pulling force – what it depends on?
- on a block made of mild steel, optimally conducting the magnetic flux
- whose thickness equals approx. 10 mm
- characterized by smoothness
- without any insulating layer between the magnet and steel
- during detachment in a direction perpendicular to the plane
- in neutral thermal conditions
Lifting capacity in real conditions – factors
- Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
- Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
- Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Precautions when working with neodymium magnets
Risk of cracking
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.
Fire risk
Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Physical harm
Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing anything in their path. Be careful!
Nickel allergy
Some people experience a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching can result in an allergic reaction. We strongly advise use protective gloves.
Choking Hazard
Absolutely keep magnets out of reach of children. Choking hazard is significant, and the effects of magnets connecting inside the body are tragic.
Conscious usage
Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Magnetic interference
GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.
Maximum temperature
Monitor thermal conditions. Heating the magnet to high heat will destroy its magnetic structure and strength.
Health Danger
Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.
Threat to electronics
Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
