← previous
next →
Product available Ships today (order by 14:00)

UMC 25x6/4x8 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320408

GTIN/EAN: 5906301814641

Diameter

25 mm [±1 mm]

internal diameter Ø

6/4 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.00 kg / 137.29 N

Coating

[NiCuNi] Nickel

technical parameters »

11.70 ZŁ with VAT / pcs + price for transport

9.51 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
9.51 ZŁ
11.70 ZŁ
price from 50 pcs
8.94 ZŁ
11.00 ZŁ
price from 100 pcs
8.37 ZŁ
10.29 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Want to negotiate?

Call us +48 22 499 98 98 or contact us by means of inquiry form through our site.
Lifting power along with form of magnets can be calculated with our force calculator.

Orders submitted before 14:00 will be dispatched today!

Technical parameters - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320408
GTIN/EAN 5906301814641
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 25 mm [±1 mm]
internal diameter Ø 6/4 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 21 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.00 kg / 137.29 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 25x6/4x8 / N38 - cylindrical 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
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%
Ecology and recycling (GPSR)
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: 320408-2026
Quick Unit Converter
Magnet pull force
Magnetic Induction
Just fill in a single box, and the tool calculate the rest for you.

Check out also deals

UMT 12x20 black / N38 - board holder
Product available Ships today (order by 14:00)

UMT 12x20 black / N38 - board holder

1.894 ZŁ brutto / pcs
NCM 15x13.5x5 / N38 - channel magnetic holder
Product available Ships today (order by 14:00)

NCM 15x13.5x5 / N38 - channel magnetic holder

5.10 ZŁ brutto / pcs
MW 10x5 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 10x5 / N38 - cylindrical magnet

1.513 ZŁ brutto / pcs
UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread
Product available Ships today (order by 14:00)

UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

40.59 ZŁ brutto / pcs
These are magnets in the shape of a rod in a brass or steel sleeve, ideal for embedding in deep sockets. They are used in positioning elements, injection molds, dies, and automation.
It can also be glued or pressed (maintaining tolerance) into a prepared hole. The mounting thread allows for stable and secure fixing in a machine or jig.
All magnet energy is directed exclusively to the front (active surface), increasing point force. It enables precise point action without side interference.
It is one of the most durable types of holders, resistant to crushing. The risk of magnet cracking with normal use is minimal as it is shielded.
Dimensions may vary slightly, so they are not always H7 fitted elements without machining. For mounting certainty and centering, gluing or screw fastening from the back is used.

Strengths as well as weaknesses of neodymium magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • They have excellent resistance to magnetism drop as a result of external magnetic sources,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the working part of the magnet turns out to be exceptional,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to flexibility in forming and the ability to customize to client solutions,
  • Wide application in high-tech industry – they find application in HDD drives, electric motors, advanced medical instruments, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • 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
  • Limited possibility of making nuts in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these magnets can disrupt the diagnostic process medical when they are in 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

Highest magnetic holding force – what it depends on?

The lifting capacity listed is a theoretical maximum value conducted under specific, ideal conditions:
  • using a base made of low-carbon steel, functioning as a magnetic yoke
  • whose thickness is min. 10 mm
  • with an polished touching surface
  • with zero gap (no paint)
  • under axial force vector (90-degree angle)
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the working load may be lower depending on elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Danger to pacemakers

Patients with a heart stimulator have to keep an large gap from magnets. The magnetism can interfere with the functioning of the life-saving device.

Fire warning

Drilling and cutting of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Respect the power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Allergic reactions

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands or choose versions in plastic housing.

Compass and GPS

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

Serious injuries

Big blocks can crush fingers instantly. Do not put your hand between two strong magnets.

Maximum temperature

Avoid heat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).

No play value

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Keep away from kids and pets.

Cards and drives

Powerful magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Magnet fragility

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?