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NCM 20x13.5x5 / N38 - channel magnetic holder

channel magnetic holder

Catalog no 360487

GTIN/EAN: 5906301814863

5.00

Diameter Ø

20 mm [±1 mm]

Height

13.5 mm [±1 mm]

Weight

9.2 g

Magnetization Direction

↑ axial

Load capacity

8.00 kg / 78.45 N

Coating

[NiCuNi] Nickel

7.29 with VAT / pcs + price for transport

5.93 ZŁ net + 23% VAT / pcs

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Technical details - NCM 20x13.5x5 / N38 - channel magnetic holder

Specification / characteristics - NCM 20x13.5x5 / N38 - channel magnetic holder

properties
properties values
Cat. no. 360487
GTIN/EAN 5906301814863
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 20 mm [±1 mm]
Height 13.5 mm [±1 mm]
Weight 9.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.00 kg / 78.45 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics NCM 20x13.5x5 / N38 - channel magnetic holder
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 specification and ecology
Chemical composition
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: 360487-2025
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Force (pull)

Field Strength

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Thanks to two poles on one plane, this holder holds much stronger than a regular block magnet of the same size. They are widely used in industry for fixing guards, flaps, doors, and in robot grippers.
Two mounting points (in larger models) prevent the holder from rotating and ensure a solid connection. Thanks to the flat construction, they are great for surface mounting without milling.
Thanks to the short-circuiting of the magnetic field by steel side walls, holding force is concentrated and very large. These are some of the strongest solutions for flat mounting available on the market.
The construction is mechanically very robust, allowing use in difficult workshop and industrial conditions. They are ideal for heavy doors, machine flaps, molds, and fastening systems in industry.
Magnets inside are nickel-plated, and the trough has an anti-corrosion layer. With constant contact with water, corrosion may appear, so we do not recommend them for work in rain without additional protection.

Advantages and disadvantages of neodymium magnets.

Advantages

Apart from their strong power, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • In other words, due to the shiny finish of gold, the element becomes visually attractive,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of custom machining and adapting to atypical requirements,
  • Wide application in high-tech industry – they are used in magnetic memories, electric drive systems, diagnostic systems, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in compact constructions

Limitations

Problematic aspects of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using a housing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum holding power of the magnet – what affects it?

The force parameter is a measurement result conducted under specific, ideal conditions:
  • with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by even structure
  • with zero gap (without impurities)
  • under perpendicular application of breakaway force (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

Holding efficiency is influenced by working environment parameters, such as (from most important):
  • Distance – existence of any layer (rust, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Hardened steels may attract less.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the load capacity.

H&S for magnets
Dust is flammable

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Cards and drives

Do not bring magnets near a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Product not for children

Neodymium magnets are not suitable for play. Eating a few magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.

Permanent damage

Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. This process is irreversible.

Protective goggles

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Skin irritation risks

It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select versions in plastic housing.

GPS and phone interference

Be aware: rare earth magnets produce a field that disrupts precision electronics. Maintain a safe distance from your mobile, tablet, and GPS.

Hand protection

Big blocks can break fingers instantly. Never put your hand between two strong magnets.

Medical interference

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Handling rules

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Security! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98