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UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160306

GTIN/EAN: 5906301813644

5.00
Load capacity 7.70 kg / 75.51 N
Diameter Ø
34 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
22 g

How we measure these parameters — certificates and measurements

product details »

8.00 zł net / pcs

9.84 zł with VAT (23% VAT) / pcs

price for transport

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price from 50 pcs
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9.25 zł
price from 100 pcs
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8.66 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.

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Technical - UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

Specification / characteristics - UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

properties
properties values
Cat. no. 160306
GTIN/EAN 5906301813644
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 34 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 22 g
Load capacity ~ ? 7.70 kg / 75.51 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal 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
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: 160306-2026
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Thanks to the use of soft Santoprene rubber coating, these holders do not scratch paint and ensure excellent grip even on slippery surfaces. They are commonly used in the advertising industry (car wrapping, foil fixing), lighting (LED work lamps), and mobile monitoring. The internal threaded bushing allows easy screwing of any element, creating a solid mounting point without drilling holes in the sheet metal.
Full rubberizing effectively isolates the magnetic system from moisture, road salt, and dirt, making them an ideal solution for outdoor applications. They can be safely used outdoors all year round, maintaining their properties in a wide temperature range. This is the recommended choice for mounting on a car roof, because you can be sure that rusty stains will not appear on the paint after rain.
Although rubber creates a small distance reducing perpendicular pull-off force, it drastically increases resistance when trying to slide the magnet across the surface. Thanks to this, these magnets hold onto the car roof excellently even at high speeds and wind resistance. They ensure maximum stability of mounting under vibrations, which is crucial in transport and automotive.
You can screw any metric bolt, hook, handle, cable holder into the magnet or screw the device housing directly. Just remember to choose the appropriate screw length – too long can push the rubber from the bottom and damage the paint.
Most rubberized holders use a special multi-pole system (often close to a Halbach array) on a steel base. Thanks to this, the magnet holds the sheet metal strongly but does not disturb devices in the cabin or attract metal objects from afar.

Pros and cons of rare earth magnets.

Benefits

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They have stable power, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • By applying a shiny coating of nickel, the element has an nice look,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of precise machining as well as adapting to concrete needs,
  • Fundamental importance in high-tech industry – they find application in data components, brushless drives, diagnostic systems, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power 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 suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in producing nuts and complicated forms in magnets, we recommend using a housing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small components of these products are able to complicate diagnosis medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

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

Breakaway force was determined for ideal contact conditions, including:
  • using a sheet made of mild steel, acting as a circuit closing element
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an ideally smooth touching surface
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower subject to the following factors, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Metal Allergy

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness happens, immediately stop handling magnets and use protective gear.

Combustion hazard

Dust generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Crushing force

Big blocks can smash fingers in a fraction of a second. Under no circumstances put your hand betwixt two strong magnets.

Heat sensitivity

Monitor thermal conditions. Heating the magnet to high heat will destroy its properties and strength.

Magnet fragility

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

Impact on smartphones

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Swallowing risk

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Store away from kids and pets.

Electronic hazard

Avoid bringing magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

Medical implants

Individuals with a pacemaker have to keep an absolute distance from magnets. The magnetic field can stop the operation of the life-saving device.

Conscious usage

Handle with care. Rare earth magnets act from a distance and connect with huge force, often quicker than you can react.

Caution! Details about risks in the article: Magnet Safety Guide.