The Simpson ECCQ3-6SS-SDS2.5 End Column Cap is a heavy-duty connector built to deliver strong, reliable column-to-beam connections in end-of-beam applications in wood construction. Engineered for a 3-1/8 in. beam width and a nominal 6x post, this connector features an extended seat that provides additional bearing surface area beyond the side of the column, helping to distribute the load from the beam and reinforce the connection where it matters most. Fabricated from 7-gauge stainless steel with high and severe corrosion resistance, it is well suited for demanding outdoor, coastal, and treated-lumber environments. Simpson column caps are designed to accommodate a wide range of project sizes, generally eliminating the need for additional brackets or braces.

Key Features

• Strong-Drive SDS Heavy-Duty Connector screws included - comes with (28) 1/4 in. x 2-1/2 in. stainless-steel SDS screws, so you have everything needed for a complete, code-compliant installation right out of the box.
• Lower-profile SDS screw attachment - SDS screws sit with a lower profile than standard through bolts, resulting in a cleaner installation with no protruding hardware.
• Extended seat bearing surface - the seat extends beyond the side of the column to distribute beam loads more effectively, reducing stress concentration at the connection point.
• Certified welds - welds are certified for strength and loading, giving you verifiable confidence in the structural integrity of every connector.
• Increased uplift load capacity - uplift loads have been increased for earthquake or wind loading, making this cap appropriate for structural connections in high-wind and seismic zones.
• Diamond holes for temporary fastening - allows the connector to be temporarily secured during positioning before final fastener installation, streamlining the assembly process.
• 7-gauge stainless steel construction - the heavy-gauge material provides the rigidity and high and severe corrosion resistance required for post-and-beam structures exposed to harsh environmental conditions.

Why This Product

• Ready to install with no extra hardware required - the included stainless-steel Strong-Drive SDS screws mean there is no need to source separate fasteners, saving time and ensuring the correct fasteners are used with a stainless-steel connector.
• Built for corrosive and high-exposure environments - the all-stainless-steel construction, combined with heavy 7-gauge material, makes this cap a dependable choice for coastal settings, outdoor structures, and applications involving treated lumber where corrosion resistance is critical.
• Engineered for structural confidence under demanding loads - certified welds and increased uplift capacity for earthquake and wind loading mean this connector is designed to perform where structural reliability is non-negotiable.
• Simplifies end-of-beam post-and-beam connections - the ECCQ design accommodates end-of-beam column-to-beam applications specifically, with an extended bearing seat that helps consolidate load transfer into a single connector without requiring additional brackets or braces.

Specifications

• Model Number (MPN): ECCQ3-6SS-SDS2.5
• Beam Width: 3-1/8 in.
• Nominal Post Size: 6x
• Member Size: 3-1/8 in. beam, 6x post
• Dimension W1: 3-1/4 in.
• Dimension W2: 5-1/2 in.
• Dimension L: 8-1/2 in.
• Dimension H: 7 in.
• Material: Stainless Steel
• Finish: Stainless Steel
• Gauge: 7-Gauge
• Corrosion Resistance: High / Severe
• Country of Origin: United States

Approved Applications

• End-of-beam column-to-beam connections in wood construction
• Structural connections requiring high or severe corrosion resistance (coastal, outdoor, or treated-lumber environments)
• Applications subject to increased uplift loads from earthquake or wind loading
• Heavy-duty post and beam construction with nominal 6x posts and 3-1/8 in. beams

What's Included

This product includes (28) 1/4 in. x 2-1/2 in. stainless-steel Strong-Drive SDS Heavy-Duty Connector screws (Model: SDS25212SS) - (14) for the beam and (14) for the post.

Installation Note: St

Options

• Contact us for Configurable Options and Special orders

Frequently Asked Questions

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

The ECCQ3-6SS-SDS2.5 is specifically designed for a 3-1/8 in. beam width and a nominal 6x post. It is intended for end-of-beam applications in wood construction.

What fasteners are required for installation, and are they included?

Installation requires 28 stainless-steel 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws (Model: SDS25212SS). These screws are included with the connector. Note that stainless-steel fasteners are required when installing stainless-steel connectors.

Why choose stainless steel over a standard steel version of this connector?

The stainless-steel construction of the ECCQ3-6SS-SDS2.5 provides high and severe corrosion resistance, making it well suited for demanding outdoor and coastal environments where standard steel connectors may be prone to corrosion over time.

What advantages do the SDS screws offer compared to standard through bolts?

The Strong-Drive SDS Heavy-Duty Connector screws provide a lower profile than standard through bolts and attach to a greater net section area of the column than a bolt attachment normally entails, allowing for fast installation without sacrificing connection strength.