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UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340311

GTIN/EAN: 5906301814733

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

How we measure these parameters — certificates and measurements

see parameters »

8.00 zł net / pcs

9.84 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Gross
price from 1 pcs
8.00 zł
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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Product card - UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics - UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340311
GTIN/EAN 5906301814733
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 6 mm [±1 mm]
Weight 26 g
Load capacity ~ ? 7.70 kg / 75.51 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external 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 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%

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: 340311-2026
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Pulling force

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Rubberized magnets with a screw (stud) are created for quick mounting of elements on metal surfaces that require protection. Ideally suited for outdoor, off-road applications and on special vehicles.
Yes, these holders are completely resistant to weather conditions thanks to the hermetic Santoprene rubber coating. The rubber is resistant to UV radiation and does not crack in the sun.
Soft rubber provides a barrier between the hard magnet and the paint, eliminating the risk of scratches. Rubber has a high coefficient of friction, ensuring stability even with vibrations and wind.
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.
Thanks to the multi-pole system (Multi-Pole), force is concentrated at the surface, giving a strong grip. Holding force depends on the roof sheet thickness.

Strengths and weaknesses of neodymium magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • They retain their magnetic properties even under external field action,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Thanks to modularity in shaping and the capacity to customize to specific needs,
  • Universal use in innovative solutions – they are used in hard drives, drive modules, medical devices, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using cover - magnetic holder.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

Magnet power was determined for optimal configuration, assuming:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • whose thickness equals approx. 10 mm
  • with a surface cleaned and smooth
  • under conditions of no distance (metal-to-metal)
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Effective lifting capacity is influenced by working environment parameters, including (from most important):
  • Distance (betwixt the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is standardly several 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 generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
  • Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets
Dust explosion hazard

Machining of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Fragile material

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Magnetic media

Equipment safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Phone sensors

Remember: rare earth magnets generate a field that confuses sensitive sensors. Keep a separation from your phone, device, and GPS.

Handling guide

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

Choking Hazard

Neodymium magnets are not toys. Eating several magnets can lead to them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Heat sensitivity

Watch the temperature. Heating the magnet to high heat will destroy its properties and strength.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and use protective gear.

Finger safety

Watch your fingers. Two large magnets will snap together immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Security! More info about hazards in the article: Safety of working with magnets.