Cable Tray Threaded Screw Specification Table
Cable tray threaded screws are typically M6 truss-head bolts with combination nuts, selected based on tray width, load, and material, and are used with washers and connectors for secure installation.
Common Threaded Screw Specifications for Cable Trays
| Component | Specification | Application / Notes |
|---|---|---|
| Truss-Head Bolt | FRS M6 | Used to fasten straight connectors and joint plates; passes through the inner side of the tray rail and secured with combination nuts on the outer side |
| Combination Nut | M6 | Works with FRS M6 bolts; ensures secure fastening without damaging cables |
| Threaded Rods | CWT-TR-Mxx-xM (custom length) | Used for suspending trays from ceilings or structures; length chosen based on load and installation height |
| Flat Washers | CWT-FW-xx | Placed under nuts or bolt heads to distribute load and prevent damage to tray surfaces |
| DIN934 Nuts | CWT-NM8-xx | Standard nuts for threaded rod connections; size selected according to rod diameter |
| Extension Nuts / Hanger Bolts / Steel Impact Dowels | CWT-TEN-Mxx, CWT-HB-Mx-ss, CWT-SID-Mxx | Used for attaching rods to different construction materials; selection depends on substrate type |
Installation Notes
- Screws should always pass through the rail from the inner side to avoid cable damage .
- For tray widths ≥400 mm, a joint plate is recommended to prevent transverse bending; optional for widths ≤300 mm .
- Cable trays can be mounted indoors or outdoors depending on corrosion protection (galvanized, stainless steel, or pre-galvanized steel), .
- Ambient temperature range for installation: ‒20 °C to 120 °C; below ‒20 °C, material may become brittle .
- Fasteners must comply with IEC 61537:2006 standards for cable management systems .
Material and Corrosion Considerations
- Steel: Pre-galvanized or hot-dip galvanized for general use .
- Stainless Steel: AISI 316L recommended for high corrosion resistance, especially in chlorinated or outdoor environments .
- Aluminum: Lightweight and corrosion-resistant, suitable for less mechanically demanding installations .
This table and notes provide a practical reference for selecting threaded screws and related fasteners for cable tray systems, ensuring compliance with standards and safe installation.
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