U-Channel 90° Post Caps

U-channel 90-degree post caps available in 3 ½”, 5 ½”, 12”, 18" and 24" slots for flat and extruded sign blades. The blade sits 90 degrees to post flange. Brackets are drilled and tapped for 5/16" set screws; on the opposite side, a 9/16" clearance hole is drilled for bolt-through installation.

More Information

Bracket Size Selection Guide

Bracket Slot Length Recommended Sign Size Blade Type Compatibility
3-1/2″ Up to 18″ Flat
5-1/2″ 18″ to 30″ Flat & Extruded
12″ 30″ to 42″ Flat & Extruded
18″ 42″ to 54″ Flat & Extruded
24″ 54″ and above Flat & Extruded

Technical Specifications & Compatibility

Flat vs. Extruded Blade Compatibility

Flat blades: Standard thickness signs suitable for most applications. Lighter weight and cost-effective for general street signage.
Extruded Blades: Thicker, heavy-duty signs with enhanced durability. Recommended for high-wind areas and premium installations.

Installation Requirements

Hardware needed:

  • Standard set screws (included with pre-drilled and tapped brackets)
  • Standard Allen Key for installation
  • Optional: Vandal-proof set screws with specialized T-Handle tool for enhanced security
All mounting hardware and tools are available in our Sign Mounting Fasteners section.

Real World Applications

A 90° U-Channel Bracket holds the sign perpendicular (at a right angle) to the post

Ideal for single signs that need clearly seen from one direction, perpendicular to the post

U-Channel 90° Bracket: Simple design and easy installation