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Specifications of Umbrella Nuts for Cable Trays

Umbrella nuts for cable trays are typically M12 fasteners made of zinc-plated, stainless steel, or hot-dip galvanized material, designed to secure cable trays to channels while complying with BS 3382 and BS 6946 standards.

Material and Finish

Umbrella nuts are commonly manufactured from mild steel, stainless steel (grade 316L), or hot-dip galvanized steel to ensure corrosion resistance and mechanical strength in industrial environments. The standard finishes include: Zinc-plated for general indoor useStainless steel (S) for high-corrosion or outdoor environmentsHot-dip galvanized (G) for enhanced protection against moisture and chemical exposure Size and ThreadingStandard umbrella nuts for cable trays are M12, compatible with M12 channel bolts and setscrews. Threads are designed to match hexagon head setscrews for secure fastening.

The umbrella shape allows the nut to self-align and distribute load evenly across the channel surface.

Standards Compliance

Umbrella nuts and associated channels are manufactured according to BS 3382 Part 2 and BS 6946, ensuring structural integrity and compatibility with metal channel cable support systems. Channels and nuts are designed to handle maximum load conditions, with M12 nuts recommended for heavy-duty installations.

Installation and Usage

Umbrella nuts are inserted into the slots of strut channels and rotated to lock in place. They are used in combination with hexagon head setscrews to secure cable trays, ladders, or mesh trays to the support structure. Proper torque should be applied to prevent loosening while avoiding damage to the channel or tray.

They are suitable for horizontal and vertical mounting, as well as for supporting bends, T-pieces, and crossovers in cable tray systems.

Advantages

Load distribution: The umbrella shape spreads the clamping force over a larger area. Ease of installation: Can be inserted and rotated into position without disassembling the channel. Corrosion resistance: Available in finishes suitable for indoor, outdoor, and industrial environments.

Standards compliance: Ensures safety, reliability, and compatibility with IEC 61537 and other cable tray standards. In summary, umbrella nuts are essential fasteners for cable tray systems, providing secure, standardized, and corrosion-resistant connections between trays and support channels, with M12 size being the most common for industrial applications.

Specifications of Umbrella Nuts for Cable Trays
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