Specifications and Models of Cable Tray Screws

Cable tray screws are typically M6 bolts or self-drilling fasteners made from steel or 316L stainless steel, designed for secure mechanical connections and corrosion resistance.Screw Types and SizesCa...

Specifications and Models of Cable Tray Screws

Cable tray screws are typically M6 bolts or self-drilling fasteners made from steel or 316L stainless steel, designed for secure mechanical connections and corrosion resistance.

Screw Types and Sizes

Cable tray systems commonly use M6 roofing bolts for couplers, fishplates, and other connectors, ensuring strong mechanical connections without damaging cables during installation . Self-drilling screws are also widely used, especially for aluminum and steel trays, allowing quick installation without pre-drilling . Rail heights for compatible trays generally range from 4" to 7" .

Materials and Finishes

  • Steel screws: Standard for most aluminum and steel cable trays.
  • 316L stainless steel screws: Used for stainless steel trays or applications requiring high corrosion resistance, such as food processing or outdoor environments .
  • Geomet-coated fasteners: Provide additional corrosion protection for steel and aluminum systems .

Installation and Compatibility

  • Screws must be fully threaded and isometric, compliant with relevant mechanical standards to withstand installation stresses .
  • Connector pairs are supplied with straight sections and fittings; additional screws may be required for field cuts or spares .
  • Bonding jumpers are recommended for expansion splice plates, adjustable connectors, and tray discontinuities to maintain electrical continuity .

Corrosion and Environmental Considerations

  • 316L stainless steel screws resist most oxidizing acids and general corrosion but may be susceptible to pitting in chloride-rich environments .
  • Steel screws with protective coatings are suitable for indoor or less corrosive environments.

Summary

For standard cable tray installations, M6 bolts or self-drilling screws in steel or 316L stainless steel are recommended. Selection depends on tray material, environmental conditions, and the need for corrosion resistance. Proper installation ensures mechanical stability, electrical continuity, and long-term durability .

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