Threaded rods are used to suspend and support cable trays, allowing precise height adjustment and secure installation of electrical and communication cables.

Purpose of Threaded Rods

Threaded rods serve as vertical hangers for cable trays, particularly ladder and basket types. They allow trays to be suspended from ceilings or structural supports, providing a stable framework for routing cables. By threading nuts and washers onto the rods, installers can adjust the tray height and ensure proper alignment, which is critical for maintaining load distribution and preventing sagging .

Installation Process

1. Positioning the Rods: Thread the upper hex nut onto the rod approximately 203 mm (8") above the intended tray bottom for single trays, or 50 mm (2") above the top rail for existing trays .
2. Attaching Clamps: Place ladder tray clamps (SC) around the tray siderails and insert the threaded rod through the clamp holes. Ensure a washer is positioned between the upper nut and the clamp to distribute load evenly .
3. Securing the Tray: Add a second washer and hex nut below the clamp, then adjust the nuts to raise or lower the tray to the desired height. Tighten the upper nut to lock the clamp in place .
4. Double Tray Support: For adjacent trays, double ladder hanger clamps (DC) can be used to support two trays on a single rod .

Specifications and Materials

Threaded rods are available in various diameters, commonly M6, M8, and M10, and lengths ranging from 1 to 3 meters . They are typically made from galvanized steel, stainless steel, or other corrosion-resistant materials, and some rods offer fire resistance up to 90 minutes at 1000°C for compliance with safety standards .

Load Capacity and Spacing

Each hanger rod has a maximum load capacity of approximately 318–340 kg (700–750 lbs), with a recommended support spacing of up to 3.6 meters between rods . Proper spacing and secure installation are essential to prevent tray deformation and ensure safe cable management.

Advantages

• Adjustable height for precise alignment
• Strong and durable support for heavy cable loads
• Compatibility with various tray types and clamps
• Customizable lengths and materials for specific project requirements Threaded rods are therefore a critical component in cable tray systems, providing both structural support and flexibility for electrical and telecommunication installations.