What size nut should a 20mm cable tray be

For a 20mm cable tray bolt, an M6 or M8 nut is typically used, with M6 being the most common for standard 20mm tray bolts.

Recommended Nut Size

For a 20mm cable tray bolt, the standard nut size is usually M6 when paired with a 20mm length bolt . These nuts are often serrated flange nuts, which provide a vibration-resistant hold and prevent loosening over time. The flange design increases friction and distributes pressure evenly, making it ideal for electrical and mechanical installations . In some cases, M8 nuts may be used if the tray or installation requires a heavier-duty connection, but for most standard 20mm cable tray bolts, M6 nuts are sufficient .

Types of Nuts

• Flange Nuts: Commonly used with 20mm tray bolts; serrated to resist vibration .
• Tray Nuts: Designed specifically for cable trays, providing secure attachment to the tray slots .

Installation Tips

• Ensure the nut matches the bolt thread (e.g., M6 bolt with M6 nut).
• Use a pozidrive or Phillips screwdriver for truss head bolts to tighten efficiently .
• For high-vibration environments, serrated flange nuts are preferred to prevent loosening . In summary, for a 20mm cable tray bolt, the M6 serrated flange nut is the standard choice, while M8 nuts are used for heavier-duty applications. This ensures a secure, reliable, and vibration-resistant installation.