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UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340313

GTIN/EAN: 5906301814757

5.00
Load capacity 42.90 kg / 420.71 N
Diameter Ø
88 mm [±1 mm]
Height
8.5 mm [±1 mm]
Weight
193 g

How we measure these parameters — certificates and measurements

view specifications »

33.00 zł net / pcs

40.59 zł with VAT (23% VAT) / pcs

price for transport

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price from 30 pcs
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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 of the product - UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics - UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340313
GTIN/EAN 5906301814757
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 88 mm [±1 mm]
Height 8.5 mm [±1 mm]
Weight 193 g
Load capacity ~ ? 42.90 kg / 420.71 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 88x8.5 [M8] 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 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%

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: 340313-2026
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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.
The magnet is tightly sealed with rubber, which protects it from water, road salt, mud, and corrosion. 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. However, it is worth remembering to wipe the roof of dust and sand before mounting so that it does not get under the magnet.
The length of the protruding screw is usually from 8 to 15 mm (you will find the exact dimension in the technical specification). Allows easy lamp mounting by passing the screw through the hole in the holder and tightening the nut.
Thanks to the multi-pole system (Multi-Pole), force is concentrated at the surface, giving a strong grip. For secure mounting on a car roof, we recommend using several holders (e.g., 3-4 pieces per lamp).

Pros as well as cons of rare earth magnets.

Strengths

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
  • They feature excellent resistance to weakening of magnetic properties due to external fields,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the top side of the magnet is very high,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
  • In view of the ability of free forming and customization to custom requirements, neodymium magnets can be created in a broad palette of shapes and sizes, which makes them more universal,
  • Huge importance in future technologies – they find application in HDD drives, drive modules, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions

Disadvantages

Cons of neodymium magnets: application proposals
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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 extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum magnetic pulling force – what contributes to it?

Holding force of 42.90 kg is a measurement result performed under specific, ideal conditions:
  • using a plate made of mild steel, acting as a ideal flux conductor
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of no distance (metal-to-metal)
  • under perpendicular force direction (90-degree angle)
  • at standard ambient temperature

What influences lifting capacity in practice

During everyday use, the actual holding force is determined by many variables, ranked from most significant:
  • Distance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Temperature – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity was determined by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Magnet fragility

NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them shattering into shards.

Maximum temperature

Standard neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Serious injuries

Protect your hands. Two powerful magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!

Medical interference

Patients with a ICD must keep an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Precision electronics

Note: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Respect the power

Exercise caution. Rare earth magnets attract from a distance and snap with massive power, often faster than you can move away.

Allergic reactions

A percentage of the population experience a contact allergy to Ni, which is the common plating for neodymium magnets. Prolonged contact may cause an allergic reaction. We strongly advise use safety gloves.

Cards and drives

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Dust is flammable

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Choking Hazard

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

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