← previous
Product available Ships tomorrow CO2 GPSR PPWR REACH

UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340423

GTIN/EAN: 5906301814764

5.00
Load capacity 18.40 kg / 180.44 N
Diameter Ø
66 mm [±1 mm]
Height
8.5 mm [±1 mm]
Weight
100 g

How we measure these parameters — certificates and measurements

product details »

19.00 zł net / pcs

23.37 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
19.00 zł
23.37 zł
price from 20 pcs
17.86 zł
21.97 zł
price from 50 pcs
16.72 zł
20.57 zł

Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

Detailed specification - UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics - UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340423
GTIN/EAN 5906301814764
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 66 mm [±1 mm]
Height 8.5 mm [±1 mm]
Weight 100 g
Load capacity ~ ? 18.40 kg / 180.44 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread
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 310 °C
Curie Temperature TF 590 °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 and environmental data

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%

Sustainability

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: 340423-2026
Magnet Unit Converter

Magnet pull force

Magnetic Field

Type your figure in a box, to see the remaining units convert automatically.

Check out also deals

UMC 42x7/4x9 / N38 - cylindrical magnetic holder
Product available Ships tomorrow

UMC 42x7/4x9 / N38 - cylindrical magnetic holder

29.99 zł brutto / pcs
MW 5x15 / N38 - cylindrical magnet
Product available Ships tomorrow

MW 5x15 / N38 - cylindrical magnet

1.107 zł brutto / pcs
NCM 10x13.5x5 / N38 - channel magnetic holder
Product available Ships tomorrow

NCM 10x13.5x5 / N38 - channel magnetic holder

3.39 zł brutto / pcs
UI 39x9x7 [BA] - badge holder
Product available Ships tomorrow

UI 39x9x7 [BA] - badge holder

0.923 zł brutto / pcs
The protruding thread allows instant screwing of a lamp or holder using a nut. It is a safe and durable mounting without drilling holes in the bodywork.
Yes, these holders are completely resistant to weather conditions thanks to the hermetic Santoprene rubber coating. This is the best, professional solution for mounting on a vehicle roof.
Soft rubber provides a barrier between the hard magnet and the paint, eliminating the risk of scratches. A clean surface under the magnet guarantees no scratches and maximum adhesion.
The thread size is standard and fits typical nuts available in hardware stores. It is a solid threaded connection made of galvanized steel, resistant to breaking.
Although nominal capacity (e.g., 18.40 kg) is lower than a bare magnet, real adhesion on slippery paint is much better. Holding force depends on the roof sheet thickness.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to look better,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of individual shaping and adapting to defined requirements,
  • Fundamental importance in high-tech industry – they are commonly used in HDD drives, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

What to avoid - cons of neodymium magnets: tips and applications.
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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 resistant to moisture, in case of application outdoors
  • We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Detachment force of the magnet in optimal conditions – what it depends on?

The specified lifting capacity represents the limit force, recorded under ideal test conditions, specifically:
  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Key elements affecting lifting force

During everyday use, the actual holding force results from many variables, presented from crucial:
  • Distance – the presence of foreign body (rust, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy steels lower magnetic permeability and holding force.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the holding force.

H&S for magnets
Respect the power

Be careful. Neodymium magnets act from a distance and snap with massive power, often quicker than you can move away.

Warning for allergy sufferers

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands and select coated magnets.

Protect data

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

Compass and GPS

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Beware of splinters

Neodymium magnets are sintered ceramics, which means they are very brittle. Clashing of two magnets will cause them breaking into shards.

Dust is flammable

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Product not for children

Adult use only. Small elements pose a choking risk, leading to serious injuries. Keep out of reach of children and animals.

Serious injuries

Large magnets can crush fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.

Danger to pacemakers

Individuals with a ICD must maintain an large gap from magnets. The magnetism can interfere with the functioning of the implant.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?