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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

technical details »

8.00 zł net / pcs

9.84 zł with VAT (23% VAT) / pcs

price for transport

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Gross
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9.84 zł
price from 50 pcs
7.52 zł
9.25 zł
price from 100 pcs
7.04 zł
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 data - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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

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: 160306-2026
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Magnets in rubber were created for non-invasive mounting on sensitive painted surfaces, such as car bodies or machine casings. Used for mounting taxi beacons, antennas, cameras, and license plates at rallies, where quick disassembly counts. The internal threaded bushing allows easy screwing of any element, creating a solid mounting point without drilling holes in the sheet metal.
Yes, thanks to the tight rubber coating, these magnets are fully waterproof and protected against corrosion. 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 safety 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. This enables quick creation of a magnetic base for work lighting, reversing cameras, sensors, or advertising boards.
Such an arrangement makes the field very strong right at the rubber (high lifting capacity) but quickly fades with distance. 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 as well as cons of rare earth magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after approximately ten years it drops only by ~1% (theoretically),
  • They feature excellent resistance to weakening of magnetic properties as a result of external fields,
  • Thanks to the shiny finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an aesthetic appearance,
  • They feature 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 shape) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in shaping and the ability to modify to specific needs,
  • Huge importance in modern industrial fields – they are commonly used in hard drives, brushless drives, diagnostic systems, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Cons

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Maximum holding power of the magnet – what it depends on?

The load parameter shown refers to the limit force, recorded under laboratory conditions, specifically:
  • using a sheet made of high-permeability steel, acting as a ideal flux conductor
  • with a thickness minimum 10 mm
  • with an ideally smooth touching surface
  • with direct contact (no impurities)
  • during detachment in a direction vertical to the plane
  • in stable room temperature

Determinants of lifting force in real conditions

Please note that the working load will differ influenced by the following factors, in order of importance:
  • Air gap (betwixt the magnet and the metal), as even a very small distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Steel thickness – insufficiently thick steel does not close the flux, causing part of the flux to be escaped into the air.
  • Steel type – low-carbon steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Electronic hazard

Device Safety: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Magnetic interference

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

Keep away from children

Adult use only. Tiny parts pose a choking risk, causing severe trauma. Keep away from kids and pets.

Power loss in heat

Control the heat. Exposing the magnet to high heat will permanently weaken its properties and strength.

Medical interference

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Flammability

Dust produced during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Shattering risk

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Warning for allergy sufferers

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop handling magnets and use protective gear.

Finger safety

Large magnets can crush fingers instantly. Never put your hand between two attracting surfaces.

Conscious usage

Use magnets with awareness. Their huge power can surprise even experienced users. Plan your moves and do not underestimate their force.

Important! More info about risks in the article: Magnet Safety Guide.