The Simpson ECC66HDG End Column Cap is a heavy-duty structural connector engineered by Simpson to deliver strong, reliable column-beam connections in end-of-beam applications throughout wood construction. The cap's seat extends beyond one side of the column to provide additional bearing surface area, helping to distribute beam loads effectively and support the overall connection. Finished with hot-dip galvanization and fabricated from 7-gauge steel, this end cap is built to hold up in demanding exterior environments and installations involving treated lumber.

Key Features

• Certified welds - provide verified strength and consistent load performance you can count on in structural applications
• Increased uplift load capacity - engineered to handle the elevated forces generated by earthquake or wind loading, adding a critical layer of structural resilience
• Bolt spacing that meets NDS code requirements - ensures the connection performs to code and eliminates guesswork during inspection
• Diamond holes for temporary fastening - allow you to hold the cap in position during layout and alignment before final bolting, speeding up installation
• 7-gauge steel construction - delivers the thickness and rigidity needed for heavy structural column-to-beam connections
• Hot-dip galvanized finish - offers extra corrosion resistance suited for exterior settings and contact with pressure-treated wood, where standard coatings fall short
• Fits 6x beam and 6x post members - sized specifically for nominal 6x framing, ensuring a proper, secure fit without modification

Why This Product

• Purpose-built for end-of-beam applications - unlike standard column caps, the ECC design extends bearing surface beyond one side of the post, directly addressing the load distribution challenge unique to end-of-beam connections in wood framing
• HDG coating goes beyond basic corrosion protection - the hot-dip galvanized finish is the correct choice for exterior decks, pergolas, and any application where the connector contacts treated lumber, providing durability that lighter coatings cannot match in those conditions
• Engineered for seismic and high-wind zones - with uplift loads specifically increased to address earthquake and wind forces, this column cap is a dependable choice when local codes or site conditions demand enhanced connection performance
• Confidence built into every detail - certified welds, NDS-compliant bolt spacing, and diamond positioning holes combine to make installation straightforward and the finished connection structurally sound from day one

Specifications

• Manufacturer Part Number (MPN): ECC66HDG
• Member Size: 6x Beam, 6x Post
• Width 1: 5-1/2 in.
• Width 2: 5-1/2 in.
• Length: 7-1/2 in.
• Height 1: 6-1/2 in.
• Gauge: 7
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Installation Fasteners: Install with (4) 5/8 in. diameter machine bolts (sold separately)
• Country of Origin: United States

Options

• Contact us for Configurable Options and Special orders
• Straps may be rotated 90 deg. (see SPECS)
• For special, custom or rough-cut lumber sizes, provide dimensions. An optional W2 dimension may be specified. (The W2 dimension on straps rotated 90 deg. is limited by the W1 dimension.)

Downloads and Resources

• View Specifications

Frequently Asked Questions

What is the ECC66HDG designed to connect?

The ECC66HDG is designed to provide strong column-beam connections in end-of-beam applications in wood construction, connecting a 6x beam to a 6x post.

Why should I choose the HDG version of the ECC column cap?

The hot-dip galvanized (HDG) finish offers extra corrosion resistance, making the ECC66HDG the appropriate choice for exterior applications and installations involving treated wood, where standard zinc-plated hardware may not hold up over time.

What fasteners are required to install the ECC66HDG?

Installation requires (4) 5/8 in. diameter machine bolts. The bolt spacing is designed to meet NDS code requirements to ensure optimal performance.

How does the ECC66HDG handle uplift forces from wind or earthquakes?

The ECC66HDG features certified welds and is engineered with increased uplift load capacity to perform reliably under the lateral and uplift forces associated with earthquake or wind loading events.

Note: Product dimensions may differ from picture.