Cable tray spring bolt specifications

Cable tray spring bolts are specialized fasteners designed for secure, adjustable attachment of cable trays, typically made from spring steel with defined load capacities and dimensional standards.

Material and Construction

Cable tray spring bolts are generally made from spring steel, which provides flexibility and resilience for repeated installation and adjustment without permanent deformation. The bolts are often zinc-plated or coated to resist corrosion in indoor environments, though they are not recommended for outdoor or highly corrosive conditions (Eaton B-Line series) .

Dimensions and Types

Spring bolts are available in various diameters and lengths to accommodate different cable tray sizes and strut systems. Common diameters include 3/8" and 1/2", with lengths selected based on the tray width and mounting requirements . The bolt head is typically designed to snap into channel slots or strut systems, allowing for quick installation and auto-height adjustment .

Load Capacity

The allowable load of a spring bolt depends on its material strength and installation configuration. Eaton B-Line catalogs specify that the load ratings apply to the fastener itself and do not account for the supporting structure, so proper engineering assessment is required to ensure safety .

Installation Guidelines

• Snap-fit design: The spring bolt can be inserted into the channel or strut and then rotated or pressed to lock in place.
• Adjustable positioning: The bolt allows for lateral movement along the channel to align with cable tray mounting points.
• Compatibility: Ensure the bolt matches the channel width and tray type; for example, B-Line recommends specific brackets for stud widths ranging from 9 1/4" to 16 1/2" .
• Environmental considerations: Use only in indoor, non-corrosive environments unless specified otherwise by the manufacturer .

Standards and Compliance

Spring bolts and associated cable tray systems are designed to meet National Electrical Code (NEC) requirements and may also comply with UL or NEMA standards depending on the manufacturer . Always verify that the selected fastener is suitable for the intended load, environment, and cable type.

References for Selection

For detailed specifications, including exact dimensions, load ratings, and compatible accessories, consult manufacturer catalogs such as:

• Eaton B-Line Fastener Catalog for spring steel fasteners and cable tray brackets .
• Cable Tray Technical Guides from ABB or Legrand for installation practices and material selection . By following these specifications, engineers and installers can ensure secure, compliant, and efficient cable tray installations using spring bolts.