Product on order Ships in 3-5 days

MW 19x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010038

GTIN/EAN: 5906301810377

Diameter Ø

19 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

8.51 g

Magnetization Direction

↑ axial

Load capacity

4.96 kg / 48.62 N

Magnetic Induction

240.51 mT / 2405 Gs

Coating

[Zn] Zinc

4.80 with VAT / pcs + price for transport

3.90 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
3.90 ZŁ
4.80 ZŁ
price from 200 pcs
3.67 ZŁ
4.51 ZŁ
price from 650 pcs
3.43 ZŁ
4.22 ZŁ
Want to talk magnets?

Pick up the phone and ask +48 888 99 98 98 alternatively drop us a message by means of form the contact form page.
Weight along with form of magnets can be analyzed using our magnetic calculator.

Same-day shipping for orders placed before 14:00.

Technical of the product - MW 19x4 / N38 - cylindrical magnet

Specification / characteristics - MW 19x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010038
GTIN/EAN 5906301810377
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 19 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 8.51 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.96 kg / 48.62 N
Magnetic Induction ~ ? 240.51 mT / 2405 Gs
Coating [Zn] Zinc
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 19x4 / 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

Physical modeling of the product - data

Presented data are the direct effect of a physical analysis. Results rely on models for the class Nd2Fe14B. Operational performance may differ. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - power drop
MW 19x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2405 Gs
240.5 mT
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
warning
1 mm 2239 Gs
223.9 mT
4.30 kg / 9.48 pounds
4299.0 g / 42.2 N
warning
2 mm 2033 Gs
203.3 mT
3.55 kg / 7.82 pounds
3547.4 g / 34.8 N
warning
3 mm 1811 Gs
181.1 mT
2.81 kg / 6.20 pounds
2813.0 g / 27.6 N
warning
5 mm 1376 Gs
137.6 mT
1.63 kg / 3.58 pounds
1625.2 g / 15.9 N
weak grip
10 mm 635 Gs
63.5 mT
0.35 kg / 0.76 pounds
346.3 g / 3.4 N
weak grip
15 mm 308 Gs
30.8 mT
0.08 kg / 0.18 pounds
81.2 g / 0.8 N
weak grip
20 mm 164 Gs
16.4 mT
0.02 kg / 0.05 pounds
23.2 g / 0.2 N
weak grip
30 mm 61 Gs
6.1 mT
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
weak grip
50 mm 15 Gs
1.5 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
weak grip

Table 2: Slippage hold (wall)
MW 19x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.99 kg / 2.19 pounds
992.0 g / 9.7 N
1 mm Stal (~0.2) 0.86 kg / 1.90 pounds
860.0 g / 8.4 N
2 mm Stal (~0.2) 0.71 kg / 1.57 pounds
710.0 g / 7.0 N
3 mm Stal (~0.2) 0.56 kg / 1.24 pounds
562.0 g / 5.5 N
5 mm Stal (~0.2) 0.33 kg / 0.72 pounds
326.0 g / 3.2 N
10 mm Stal (~0.2) 0.07 kg / 0.15 pounds
70.0 g / 0.7 N
15 mm Stal (~0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 19x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.49 kg / 3.28 pounds
1488.0 g / 14.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.99 kg / 2.19 pounds
992.0 g / 9.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.50 kg / 1.09 pounds
496.0 g / 4.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.48 kg / 5.47 pounds
2480.0 g / 24.3 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 19x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.50 kg / 1.09 pounds
496.0 g / 4.9 N
1 mm
25%
1.24 kg / 2.73 pounds
1240.0 g / 12.2 N
2 mm
50%
2.48 kg / 5.47 pounds
2480.0 g / 24.3 N
3 mm
75%
3.72 kg / 8.20 pounds
3720.0 g / 36.5 N
5 mm
100%
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
10 mm
100%
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
11 mm
100%
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
12 mm
100%
4.96 kg / 10.93 pounds
4960.0 g / 48.7 N

Table 5: Thermal stability (stability) - power drop
MW 19x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.96 kg / 10.93 pounds
4960.0 g / 48.7 N
OK
40 °C -2.2% 4.85 kg / 10.69 pounds
4850.9 g / 47.6 N
OK
60 °C -4.4% 4.74 kg / 10.45 pounds
4741.8 g / 46.5 N
80 °C -6.6% 4.63 kg / 10.21 pounds
4632.6 g / 45.4 N
100 °C -28.8% 3.53 kg / 7.79 pounds
3531.5 g / 34.6 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 19x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 10.11 kg / 22.28 pounds
3 990 Gs
1.52 kg / 3.34 pounds
1516 g / 14.9 N
N/A
1 mm 9.48 kg / 20.89 pounds
4 657 Gs
1.42 kg / 3.13 pounds
1421 g / 13.9 N
8.53 kg / 18.80 pounds
~0 Gs
2 mm 8.76 kg / 19.31 pounds
4 477 Gs
1.31 kg / 2.90 pounds
1314 g / 12.9 N
7.88 kg / 17.38 pounds
~0 Gs
3 mm 8.00 kg / 17.64 pounds
4 279 Gs
1.20 kg / 2.65 pounds
1200 g / 11.8 N
7.20 kg / 15.88 pounds
~0 Gs
5 mm 6.47 kg / 14.25 pounds
3 846 Gs
0.97 kg / 2.14 pounds
970 g / 9.5 N
5.82 kg / 12.83 pounds
~0 Gs
10 mm 3.31 kg / 7.30 pounds
2 753 Gs
0.50 kg / 1.10 pounds
497 g / 4.9 N
2.98 kg / 6.57 pounds
~0 Gs
20 mm 0.71 kg / 1.56 pounds
1 271 Gs
0.11 kg / 0.23 pounds
106 g / 1.0 N
0.64 kg / 1.40 pounds
~0 Gs
50 mm 0.02 kg / 0.04 pounds
193 Gs
0.00 kg / 0.01 pounds
2 g / 0.0 N
0.01 kg / 0.03 pounds
~0 Gs
60 mm 0.01 kg / 0.01 pounds
121 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.01 pounds
81 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
56 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
41 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
30 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (electronics) - warnings
MW 19x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.5 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - collision effects
MW 19x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.39 km/h
(7.05 m/s)
0.21 J
30 mm 42.19 km/h
(11.72 m/s)
0.58 J
50 mm 54.44 km/h
(15.12 m/s)
0.97 J
100 mm 76.99 km/h
(21.39 m/s)
1.95 J

Table 9: Anti-corrosion coating durability
MW 19x4 / N38

Technical parameter Value / Description
Coating type [Zn] Zinc
Layer structure Zn (Zinc)
Layer thickness 8-15 µm
Salt spray test (SST) ? 48 h
Recommended environment Indoors / Garage

Table 10: Electrical data (Pc)
MW 19x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 831 Mx 78.3 µWb
Pc Coefficient 0.30 Low (Flat)

Table 11: Underwater work (magnet fishing)
MW 19x4 / N38

Environment Effective steel pull Effect
Air (land) 4.96 kg Standard
Water (riverbed) 5.68 kg
(+0.72 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Note: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Thermal stability

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.30

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.

Engineering data and GPSR
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
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: 010038-2026
Magnet Unit Converter
Force (pull)

Field Strength

Other products

The offered product is an exceptionally strong cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø19x4 mm, guarantees the highest energy density. This specific item is characterized by an accuracy of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 4.96 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 48.62 N with a weight of only 8.51 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, 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 high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø19x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø19x4 mm, which, at a weight of 8.51 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 4.96 kg (force ~48.62 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They retain magnetic properties for nearly 10 years – the loss is just ~1% (based on simulations),
  • Neodymium magnets are highly resistant to demagnetization caused by external field sources,
  • In other words, due to the reflective finish of gold, the element gains a professional look,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Possibility of exact shaping and adjusting to individual conditions,
  • Fundamental importance in future technologies – they find application in computer drives, electromotive mechanisms, medical equipment, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in miniature devices

Weaknesses

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 strength at high temperatures. To prevent this, we advise 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 immune to moisture, in case of application outdoors
  • We suggest cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small components of these devices can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat affects it?

The lifting capacity listed is a measurement result executed under the following configuration:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • whose thickness is min. 10 mm
  • with a surface free of scratches
  • with direct contact (without impurities)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Real force impacted by specific conditions, mainly (from most important):
  • Gap (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be escaped into the air.
  • Steel grade – the best choice is pure iron steel. Stainless steels may attract less.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the load capacity.

Warnings
GPS and phone interference

GPS units and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Protect data

Do not bring magnets close to a purse, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Medical interference

Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

Conscious usage

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will destroy its properties and strength.

Warning for allergy sufferers

Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for encased magnets.

Dust is flammable

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Crushing risk

Danger of trauma: The pulling power is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Swallowing risk

Product intended for adults. Small elements pose a choking risk, causing severe trauma. Store away from kids and pets.

Shattering risk

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.

Attention! Looking for details? Check our post: Are neodymium magnets dangerous?