The Simpson ECCQ5-6SDS2.5HDG 5-1/8 in. Beam 6x Post End Column Cap HDG with SDS Screws is a heavy-duty structural connector engineered for end-of-beam column-to-beam connections in wood construction. Built by Simpson from 3-gauge steel with a hot-dip galvanized finish, this end column cap is designed to perform in demanding environments where structural integrity, corrosion resistance, and efficient installation all matter. The connector is compatible with a 5-1/8 in. beam and a 6x post, and it ships complete with Strong-Drive SDS Heavy-Duty Connector screws for both the beam and post, so installers have everything needed to complete the connection.

Key Features

• End-of-beam column-to-beam connection design - purpose-built geometry positions the beam at the end of the post, making this connector the right fit for pergolas, covered structures, and framed wood assemblies where a terminal beam connection is required.
• 3-gauge steel construction with hot-dip galvanized finish - the heavy steel gauge delivers substantial load-bearing capacity, while the hot-dip galvanized coating provides reliable corrosion resistance for exposed or high-moisture environments.
• Extended seat design - distributes beam loads across a greater bearing surface area beyond the column face, reducing point stress and supporting stronger, more stable connections.
• Strong-Drive SDS Heavy-Duty Connector screws included - the included 1/4 in. x 2-1/2 in. SDS screws fasten into a greater net section area of the column compared to standard bolt attachment, providing a lower profile and faster installation without sacrificing holding strength.
• Approved for high uplift resistance applications - rated for structural use where earthquake and wind loading demand dependable uplift resistance, giving builders confidence in code-sensitive applications.
• Made in the United States - domestic production supports consistent quality standards aligned with Simpson engineering specifications.

Why This Product

• A complete, ready-to-install connection package - this end column cap ships with 14 SDS screws for the beam side and 14 for the post side, so there are no separate fastener purchases required and no delays at the job site.
• SDS screw attachment outperforms traditional bolt connections in profile and speed - by fastening into a greater net section area of the column, the SDS screw method delivers a low-profile connection that installs faster than through-bolt alternatives, an advantage in both new construction and retrofit scenarios.
• Built for environments where corrosion is a real concern - the hot-dip galvanized finish makes this connector a dependable choice for outdoor structures, coastal settings, and any application where moisture exposure could compromise an unfinished steel connector over time.
• Engineered to meet the demands of wind and seismic zones - with approved applications specifically including high uplift resistance for earthquake and wind loading, this connector supports structural designs in regions where code requirements for lateral and uplift forces are most stringent.

Specifications

• Model Number: ECCQ5-6SDS2.5HDG
• Beam Width: 5-1/8 in.
• Dimension W1: 5-1/4 in.
• Dimension W2: 5-1/2 in.
• Dimension L: 8-1/2 in.
• Dimension H: 7 in.
• Material: 3-Gauge Steel
• Finish: Hot-Dip Galvanized (HDG)
• Fastener Size: 1/4" x 2-1/2" SDS Heavy-Duty Connector Screws
• Country of Origin: United States

Approved Applications

• End-of-beam column-to-beam connections in wood construction
• Structural applications requiring high uplift resistance due to earthquake loading
• Structural applications requiring high uplift resistance due to wind loading
• Applications where a low-profile fastener connection is preferred over standard through-bolts
• Exposed or high-moisture environments where corrosion resistance is required, due to hot-dip galvanized finish

What's Included

• 1 x ECCQ5-6SDS2.5HDG End Column Cap
• 14 x 1/4" x 2-1/2" Strong-Drive SDS Heavy-Duty Connector Screws (Beam)
• 14 x 1/4" x 2-1/2" Strong-Drive SDS Heavy-Duty Connector Screws (Post)

Installation Notes

Fasten with 1/4" x 2-1/2" Strong-Drive SDS Heavy-Duty Connector screws, which are provided with the column cap. The ECCQ uses SDS screws to attach to a greater net section area of the column than a bolt attachment normally entails, providing a lower profile and faster installation process.

Options

• Contact us for Configurable Options and Special orders
  
• Straps may be rotated 90 deg.
  

Frequently Asked Questions

What beam and post sizes is this column cap designed for?

The ECCQ5-6SDS2.5HDG is specifically designed for use with a 5-1/8" beam and a 6x post, making it suitable for end-of-beam wood construction applications requiring a reliable column-to-beam connection at those dimensions.

What type of fasteners does this column cap use, and why are they preferred?

This column cap uses Strong-Drive SDS Heavy-Duty Connector screws, which are included with the product. These screws attach to a greater net section area of the column compared to standard bolt attachment, provide a lower profile than standard through-bolts, and allow for fast, secure installation.

How does the hot-dip galvanized finish benefit this connector?

The hot-dip galvanized (HDG) finish provides superior corrosion resistance, making this connector well suited for demanding structural environments where exposure to moisture or corrosive conditions is a concern.

What design features help with load distribution and installation?

The extended seat design distributes beam loads across a greater bearing surface area beyond the column face for improved load distribution. The connector also features diamond holes to allow for temporary fastening during installation, certified welds for strength confidence, and increased uplift load values suited for earthquake and wind loading conditions.